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Not supported with pagination yet | Which of the following contains a vague pronoun reference? | [
"Mr. Hammond wanted the new employees to fill out their intake forms, but he couldn't find them.",
"Mr. Hammond wanted the new employees to fill out their intake forms, but he couldn't find the forms."
] | 0 | closed choice | grade11 | language science | writing-strategies | Pronouns | Identify vague pronoun references | When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent.
When Lisa and Kim finally landed, she breathed a sigh of relief.
The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear.
Vagu... | The second answer choice contains a vague pronoun reference. The pronoun them could refer to the new employees or their intake forms.
The first answer choice shows a possible correction for the vague pronoun reference. Them has been replaced with the forms.
Mr. Hammond wanted the new employees to fill out their intake ... | |
Not supported with pagination yet | Which word would you find on a dictionary page with the following guide words?
terrify - trousers | [
"twig",
"theme"
] | 1 | closed choice | grade6 | language science | reference-skills | Reference skills | Use guide words | Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order.
To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second let... | Put the words in alphabetical order.
Since theme is between the guide words terrify - trousers, it would be found on that page. | |
Not supported with pagination yet | What is the volume of a water pitcher? | [
"10 cups",
"10 fluid ounces",
"10 gallons"
] | 0 | Select the best estimate. | closed choice | grade4 | natural science | units-and-measurement | Units and measurement | Choose customary units of volume | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Volume is a measurement of how much space something takes up.
There are many different units of volume. When you are using customary units, volume may be written in units of fluid ounces, cups,... | The best estimate for the volume of a water pitcher is 10 cups.
10 fluid ounces is too little and 10 gallons is too much. |
Not supported with pagination yet | Which greeting is correct for a letter? | [
"Dear Uncle Ron,",
"dear Uncle Ron,"
] | 0 | closed choice | grade4 | language science | punctuation | Formatting | Greetings and closings of letters | A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue.
Dear Aunt Sue,
I'm glad you could come to my party, and
thank you for the birthday gift. I could not have
asked for a better one! Every time I... | The second greeting is correct:
Its first word is capitalized, and it ends with a comma. Uncle Ron is capitalized because it is a proper noun. | |
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is stronger in Pair 2.",
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is stronger in Pair 1."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade4 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You c... | Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger.
The magnets in Pair 1 are closer together than the magnets in Pair 2. So, the magnetic force is stronger in Pair 1 than in Pair 2. | |
Not supported with pagination yet | Is there a sentence fragment?
During the Precambrian period, most of Earth's life forms lived in oceans. Meanwhile, land masses were mostly devoid of life. | [
"yes",
"no"
] | 1 | yes or no | grade12 | language science | writing-strategies | Sentences, fragments, and run-ons | Identify sentence fragments | A sentence is a group of words that expresses a complete thought.
The band I'm in has been rehearsing daily because we have a concert in two weeks.
A sentence fragment is a group of words that does not express a complete thought.
Rehearsing daily because we have a concert in two weeks.
This fragment is missing a subjec... | There is not a sentence fragment. These are complete sentences because they express complete thoughts.
During the Precambrian period, most of Earth's life forms lived in oceans. Meanwhile, land masses were mostly devoid of life. | |
Which property matches this object? | [
"scratchy",
"shiny"
] | 1 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Identify properties of an object | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. | Look at the object.
Think about each property.
A shiny object reflects a lot of light. The bracelet is shiny.
A scratchy object is rough and itchy against your skin. The bracelet is not scratchy. | |
Not supported with pagination yet | Would you find the word easily on a dictionary page with the following guide words?
edge - envy | [
"yes",
"no"
] | 1 | yes or no | grade7 | language science | reference-skills | Reference skills | Use guide words | Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order.
To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second let... | Put the words in alphabetical order.
Since easily is not between the guide words edge - envy, it would not be found on that page. | |
Not supported with pagination yet | Which is a simple sentence? | [
"We can pack our bags tonight, or we can wait until morning.",
"The engine in the car makes a strange noise."
] | 1 | closed choice | grade3 | language science | grammar | Sentences, fragments, and run-ons | Is the sentence simple or compound? | A simple sentence is a sentence with only one subject and predicate.
The pitcher threw the ball to first base.
A compound sentence is two simple sentences joined by a comma and a conjunction such as and, but, or, or so.
The pitcher threw the ball, and the batter hit it.
Some simple sentences have a compound subject or ... | The first sentence is the simple sentence. It has one subject and predicate.
The engine in the car makes a strange noise. | |
Select the fish below. | [
"woodpecker",
"green moray eel",
"penguin",
"fire salamander"
] | 1 | Fish live underwater. They have fins, not limbs.
Fish are cold-blooded. The body temperature of cold-blooded animals depends on their environment.
A goldfish is an example of a fish. | closed choice | grade4 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification.
Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. | A fire salamander is an amphibian. It has moist skin and begins its life in water.
Fire salamanders can release poison from their skin. This poison helps protect them from predators.
A penguin is a bird. It has feathers, two wings, and a beak.
Penguins live near water. Penguins cannot fly! They use their wings to swim.... | |
Identify the question that Eliana and Dean's experiment can best answer. | [
"Does Eliana's snowboard slide down a hill in less time when it has a thin layer of wax or a thick layer of wax?",
"Does Eliana's snowboard slide down a hill in less time when it has a layer of wax or when it does not have a layer of wax?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Eliana applied a thin layer of wax to the underside of her snowboard and rode the board straight down a hill. Then, she removed the wax and rode the snowboard straight down the hill again. She repeated the rides four mo... | closed choice | grade8 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | ||
What can Stefan and Bruce trade to each get what they want? | [
"Bruce can trade his almonds for Stefan's tomatoes.",
"Bruce can trade his broccoli for Stefan's oranges.",
"Stefan can trade his tomatoes for Bruce's broccoli.",
"Stefan can trade his tomatoes for Bruce's sandwich."
] | 2 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Stefan and Bruce open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Stefan wanted ... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Stefan wanted broccoli in his lunch and Bruce was hoping for tomatoes. Look at the labeled part of the images.
Stefan has tomatoes. Bruce has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want. | ||
Which statement describes the Gobi Desert ecosystem? | [
"It has long, cold winters.",
"It has year-round snow."
] | 0 | Figure: Gobi Desert.
The Gobi Desert is a cold desert ecosystem located in northern China and southern Mongolia. This desert is next to the Himalayan Mountains and used to be part of the Mongol Empire. | closed choice | grade5 | natural science | biology | Ecosystems | Describe ecosystems | An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestri... | A cold desert is a type of ecosystem. Cold deserts have the following features: a small amount of rain or snow, dry, thin soil, and long, cold winters. So, the following statements describe the Gobi Desert ecosystem: a small amount of rain or snow, dry, thin soil, and long, cold winters. It has long, cold winters. It h... | |
As the wind pushes on the kite, what is the direction of the opposing force? | [
"away from Lexi",
"toward Lexi"
] | 1 | The text below describes a pair of opposing forces. Opposing forces act on an object in opposite directions. Read the text. Then answer the question below.
Lexi flies a kite on a windy day. She uses a string to hold on to the kite. Think about two of the forces that act on the kite:
The wind pushes away from Lexi.
The ... | closed choice | grade3 | natural science | physics | Force and motion | How do balanced and unbalanced forces affect motion? | A force is a push or a pull that acts on an object. Each force acts on an object in a certain direction. If two forces act on an object in opposite directions, they are called opposing forces. | Find the direction the wind pushes on the kite.
Lexi flies a kite on a windy day. She uses a string to hold on to the kite. Think about two of the forces that act on the kite:
The wind pushes away from Lexi.
The string pulls toward Lexi.
The text tells you that the wind pushes away from Lexi. The opposite direction is ... | |
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"neither; the samples have the same temperature",
"sample B",
"sample A"
] | 2 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | Each particle in sample A has more mass than each particle in sample B. The particles in sample A also have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average ... | |
Not supported with pagination yet | Which announcement is more formal? | [
"The Centerville Law Firm is so happy to tell you . . .",
"The Centerville Law Firm is pleased to announce . . ."
] | 1 | closed choice | grade9 | language science | writing-strategies | Audience, purpose, and tone | Which text is most formal? | Informal writing is typically used in casual situations or when communicating with someone you know well. Informal language often expresses familiarity and tends to sound more like speech. It uses more conversational language, such as slang, idioms, abbreviations, imprecise language, and contractions.
Formal writing is... | The first announcement is more formal. It uses more elevated language (pleased to announce). The other announcement sounds more conversational (so happy). | |
Not supported with pagination yet | Which object has the most thermal energy? | [
"a 100-gram cup of black tea at a temperature of 47°C",
"a 100-gram cup of black tea at a temperature of 62°C",
"a 100-gram cup of black tea at a temperature of 56°C"
] | 1 | The objects are identical except for their temperatures. | closed choice | grade4 | natural science | physics | Heat and thermal energy | How is temperature related to thermal energy? | All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy.
Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both ... | All three cups of black tea have the same mass but different temperatures. Since the 62°C cup of black tea is the hottest, it has the most thermal energy. |
Identify the question that Duncan's experiment can best answer. | [
"Do steel nails rust in fewer days when submerged in a large volume of liquid compared to a small volume?",
"Do steel nails take fewer days to rust in water compared to vinegar?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Duncan put one two-inch steel nail into each of six test tubes. He added water to three of the test tubes and vinegar to the other three. In each test tube, he completely covered the nail with the same volume of liquid.... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | ||
Which better describes the tide pool ecosystems in Salt Point State Park? | [
"It has water that is rich in nutrients. It also has many different types of organisms.",
"It has no sunlight. It also has daily flooding and draining of seawater."
] | 0 | Figure: Salt Point State Park.
Salt Point State Park is in northern California. The park is on the coast of the Pacific Ocean. It has many tide pool ecosystems. | closed choice | grade3 | natural science | biology | Ecosystems | Describe ecosystems | An ecosystem is formed when living and nonliving things interact in an environment. There are many types of ecosystems. Here are some ways in which ecosystems can differ from each other:
the pattern of weather, or climate
the type of soil or water
the organisms that live there | A tide pool is a type of ecosystem. Tide pool ecosystems have the following features: daily flooding and draining of seawater, water that is rich in nutrients, and many different types of organisms. So, the tide pool ecosystems in Salt Point State Park have water that is rich in nutrients. They also have many different... | |
What is the capital of Idaho? | [
"Boise",
"Helena",
"Louisville",
"Salem"
] | 0 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Boise is the capital of Idaho. | |||
What is the probability that a pea plant produced by this cross will be homozygous recessive for the pod shape gene? | [
"0/4",
"3/4",
"2/4",
"1/4",
"4/4"
] | 0 | This passage describes the pod shape trait in pea plants:
Pea plants protect their seeds in pouch-like cases called pods. Some pea plants grow inflated pods, which are smooth. Other pea plants grow constricted pods, which are bumpy.
In a group of pea plants, some individuals have inflated pods and others have constrict... | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate probabilities of offspring types | Offspring genotypes: homozygous or heterozygous?
How do you determine whether an organism is homozygous or heterozygous for a gene? Look at the alleles in the organism's genotype for that gene.
An organism with two identical alleles for a gene is homozygous for that gene.
If both alleles are dominant, the organism is h... | ||
Not supported with pagination yet | Compare the motion of three motorboats. Which motorboat was moving at the highest speed? | [
"a motorboat that moved 210miles west in 5hours",
"a motorboat that moved 60miles east in 5hours",
"a motorboat that moved 70miles south in 5hours"
] | 0 | closed choice | grade3 | natural science | physics | Force and motion | Compare the speeds of moving objects | An object's speed tells you how fast the object is moving. Speed depends on both distance and time.
Distance tells you how far the object has moved. One unit used to measure distance is the mile.
Time tells you how long the object has spent moving. One unit used to measure time is the hour.
Think about objects moving f... | Look at the distance each motorboat moved and the time it took to move that distance. The direction each motorboat moved does not affect its speed.
Notice that each motorboat moved for 5 hours. The motorboat that moved 210 miles moved the farthest distance in that time. So, that motorboat must have moved at the highest... | |
Not supported with pagination yet | Which text uses the word factoid in its traditional sense? | [
"As a geneticist, Kelly dislikes many popular sci-fi movies because they often present audiences with factoids that misrepresent her field.",
"As a geneticist, Kelly enjoys watching science documentaries and sharing various factoids she's learned with her colleagues."
] | 0 | closed choice | grade9 | language science | writing-strategies | Word usage and nuance | Explore words with new or contested usages | Words change in meaning when speakers begin using them in new ways. For example, the word peruse once only meant to examine in detail, but it's now also commonly used to mean to look through in a casual manner.
When a word changes in meaning, its correct usage is often debated. Although a newer sense of the word may be... | The second text uses factoid in its traditional sense: something made up presented as a true fact.
As a geneticist, Kelly dislikes many popular sci-fi movies because they often present audiences with factoids that misrepresent her field.
The first text uses factoid in its nontraditional sense: a trivial but true fact.
... | |
Does this passage describe the weather or the climate? | [
"climate",
"weather"
] | 1 | Figure: Washington, D.C..
Washington, D.C., is located on the East Coast of the United States. Last winter, on January 13, the city received over six inches of snow.
Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place. | closed choice | grade4 | natural science | earth-science | Weather and climate | Weather and climate around the world | The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pattern of ... | Read the passage carefully.
Washington, D.C., is located on the East Coast of the United States. Last winter, on January 13, the city received over six inches of snow.
The underlined part of the passage tells you about the amount of snow that fell on Washington, D.C., on January 13. This passage describes the atmospher... | |
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is smaller in Pair 1.",
"The magnitude of the magnetic force is smaller in Pair 2."
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes. | closed choice | grade7 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller.
There is a greater distance between the magnets in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2. | |
Not supported with pagination yet | Is there a surplus or a shortage of plane tickets? | [
"surplus",
"shortage"
] | 1 | There are 160 seats on a flight from New York to Chicago. Tickets for the flight cost $340. At that price, 230 people want to buy a ticket. | closed choice | grade5 | social science | economics | Supply and demand | Identify shortage and surplus | There is a surplus if there is too much for sale at a given price.
There is a shortage if there is not enough for sale at a given price.
Surpluses and shortages usually happen when people who are selling goods or services charge too much or too little.
When the price is too high, consumers will not want to buy much of ... | At the current price, there are not enough tickets for sale. There are 160 tickets for sale, but 230 people want to buy one.
So, there is a shortage of tickets. |
What is the capital of Wyoming? | [
"Denver",
"Laramie",
"Dover",
"Cheyenne"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Cheyenne is the capital of Wyoming. | |||
Not supported with pagination yet | Which logical fallacy is used in the text?
How could Mia have anything insightful to say about foreign affairs? She grew up on a farm. | [
"appeal to nature: the assumption that natural things are always good",
"bandwagon fallacy: the assumption that the popular choice is automatically correct",
"ad hominem: an attack against the person making the argument, rather than the argument itself"
] | 2 | closed choice | grade9 | language science | writing-strategies | Developing and supporting arguments | Classify logical fallacies | A strong argument uses valid reasoning and logic in support of a claim. When an argument or claim introduces irrelevant information or misrepresents the issues at hand, it may be committing a logical fallacy. Logical fallacies can hurt a writer's credibility and can lead readers to draw false conclusions.
A logical fal... | The text argues that Mia cannot be insightful about foreign affairs because she grew up on a farm. This is a personal attack that isn't relevant to whether she knows about foreign affairs. This illustrates a type of logical fallacy known as ad hominem. | |
Complete the sentence.
The word "antebellum" means (). | [
"after the long peace",
"before the feast",
"after the election",
"before the war"
] | 3 | The time period in United States history between 1820 and 1861 is often called the antebellum period. During the antebellum period, the North and South became more divided. In the following questions, you learn more about the changes that happened during the antebellum period.
The following table shows other words that... | closed choice | grade8 | social science | us-history | The Antebellum period | Causes of the Civil War: Missouri Compromise to Bleeding Kansas | Look at the underlined parts of the table.
All the words that use the root "ante" mean to come before something else. So, the root ante means "before."
All the words that use the root "bellum" mean to fight or cause war.So, the root bellum means "war."
So, the word "antebellum" means "before the war." The antebellum pe... | ||
What is the capital of Minnesota? | [
"Minneapolis",
"Lincoln",
"Saint Paul",
"Topeka"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Midwest | Saint Paul is the capital of Minnesota. | |||
Which animal is also adapted to be camouflaged in a sandy desert? | [
"merveille-du-jour moth",
"bearded dragon"
] | 1 | s live in the deserts of southern Africa. The is adapted to be camouflaged in a sandy desert.
Figure: Namaqua chameleon. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the Namaqua chameleon.
The Namaqua chameleon has sand-colored scales covering its body. It is adapted to be camouflaged in a sandy desert. The word camouflage means to blend in.
Now look at each animal. Figure out which animal has a similar adaptation.
The bearded dragon has a sand-colored body. ... | |
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample B",
"sample A",
"neither; the samples have the same temperature"
] | 1 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | The particles in both samples have the same average speed, but each particle in sample A has more mass than each particle in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average kinetic energy, sample A mus... | |
What is the capital of New Jersey? | [
"Trenton",
"Providence",
"Baton Rouge",
"Burlington"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Northeast | Trenton is the capital of New Jersey. | |||
Not supported with pagination yet | Which closing is correct for a letter? | [
"Your niece,\nJanet",
"Your Niece,\nJanet"
] | 0 | closed choice | grade2 | language science | capitalization | Capitalization | Greetings and closings of letters | A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue.
Dear Aunt Sue,
I'm glad you could come to my party, and
thank you for the birthday gift. I could not have
asked for a better one! Every time I... | The second closing is correct:
Its first word is capitalized, and it ends with a comma. | |
Not supported with pagination yet | Complete the statement.
Chloroform is (). | [
"a compound",
"an elementary substance"
] | 0 | Chloroform was once used for pain relief. It is no longer used because it can be dangerous to humans. The chemical formula for chloroform is CHCl3. | closed choice | grade5 | natural science | chemistry | Atoms and molecules | Classify elementary substances and compounds using chemical formulas | Every substance around you is made of one or more chemical elements, or types of atoms. Substances that are made of only one chemical element are elementary substances. Substances that are made of two or more chemical elements bonded together are compounds.
Every chemical element is represented by its own symbol. For s... | You can tell whether chloroform is an elementary substance or a compound by counting the number of symbols in its chemical formula. A symbol contains either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for chloroform is CHCl3. This formula contains three symbols:... |
What can Francesca and Desmond trade to each get what they want? | [
"Francesca can trade her tomatoes for Desmond's sandwich.",
"Desmond can trade his broccoli for Francesca's oranges.",
"Francesca can trade her tomatoes for Desmond's broccoli.",
"Desmond can trade his almonds for Francesca's tomatoes."
] | 2 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Francesca and Desmond open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Francesca... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Francesca wanted broccoli in her lunch and Desmond was hoping for tomatoes. Look at the labeled part of the images.
Francesca has tomatoes. Desmond has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want. | ||
Which animal's skin is better adapted as a warning sign to ward off predators? | [
"opalescent nudibranch",
"fantastic leaf-tailed gecko"
] | 0 | Sharpnose-puffers are poisonous animals with brightly colored skin. The bright color serves as a warning sign that the animal is poisonous. The 's skin is adapted to ward off predators.
Figure: sharpnose-puffer. | closed choice | grade4 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the sharpnose-puffer.
The sharpnose-puffer has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The bright colors serve as a warning sign that the sharpnose-puffer is poisonous.
Now look at each animal. Figure out which animal has a similar adaptation.
The o... | |
Not supported with pagination yet | Compare the motion of two trains. Which train was moving at a higher speed? | [
"a train that moved 635kilometers in 5hours",
"a train that moved 605kilometers in 5hours"
] | 0 | closed choice | grade2 | natural science | physics | Force and motion | Compare the speeds of moving objects | An object's speed tells you how fast the object is moving. Speed depends on both distance and time.
Distance tells you how far the object has moved. One unit used to measure distance is the kilometer.
Time tells you how long the object has spent moving. One unit used to measure time is the hour.
Think about two objects... | Look at the distance each train moved and the time it took to move that distance.
One train moved 635 kilometers in 5 hours.
The other train moved 605 kilometers in 5 hours.
Notice that each train spent the same amount of time moving. The train that moved 635 kilometers moved a farther distance in that time. So, that t... | |
Does this passage describe the weather or the climate? | [
"climate",
"weather"
] | 0 | Figure: baseball game.
The baseball players worried that the championship game might be rained out. Spring often brings low pressure systems with clouds and rain to the area near the stadium.
Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place. | closed choice | grade6 | natural science | earth-science | Weather and climate | Weather and climate around the world | The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pattern of ... | Read the passage carefully.
The baseball players worried that the championship game might be rained out. Spring often brings low pressure systems with clouds and rain to the area near the stadium.
The underlined part of the passage tells you about the usual pattern of barometric pressure near the stadium. This passage ... | |
What is the capital of West Virginia? | [
"Biloxi",
"Kansas City",
"Charleston",
"Huntington"
] | 2 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. | |||
Which of these continents does the equator intersect? | [
"Europe",
"Africa",
"Antarctica"
] | 1 | closed choice | grade4 | social science | geography | Maps | Use lines of latitude and longitude | Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latit... | The equator is the line at 0° latitude. It intersects Africa. It does not intersect Europe or Antarctica. | ||
Which of the following could Ernesto's test show? | [
"which design would have the greatest distance between the concert area and the road",
"which design would have the least traffic noise in the concert area",
"if at least 20% of the park would be shaded by trees in each design"
] | 0 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the ques... | closed choice | grade8 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a... | ||
Which type of force from the man's hand opens the car door? | [
"push",
"pull"
] | 1 | A man gets into his car. His hand applies a force to the car door, and the door opens. | closed choice | grade3 | natural science | physics | Force and motion | Identify pushes and pulls | A force is a push or a pull that one object applies to a second object.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The man's hand applies a force to the car door. This force causes the door to open. The direction of this force is toward the man's hand. This force is a pull. | |
Not supported with pagination yet | Select the one substance that is not a mineral. | [
"Native gold is a pure substance. It is not made by living things.",
"A shark's tooth is not a pure substance. It is formed in nature.",
"Potassium feldspar is a pure substance. It is a solid."
] | 1 | closed choice | grade4 | natural science | earth-science | Rocks and minerals | Identify minerals using properties | Minerals are the building blocks of rocks. A rock can be made of one or more minerals.
Minerals and rocks have the following properties:
Property | Mineral | Rock
It is a solid. | Yes | Yes
It is formed in nature. | Yes | Yes
It is not made by organisms. | Yes | Yes
It is a pure substance. | Yes | No
It has a fixed cry... | Compare the properties of each substance to the properties of minerals. Select the substance whose properties do not match those of minerals.
Native gold is a mineral.
Potassium feldspar is a mineral.
A shark's tooth is not a pure substance. But all minerals are pure substances.
So, a shark's tooth is not a mineral. | |
In this experiment, which were part of an experimental group? | [
"the steel squares soaked in salt water",
"the steel squares soaked in salt water and vinegar"
] | 1 | The passage below describes an experiment.
Layla was using steel to make rusted sculptures. After building each sculpture, she caused it to rust by placing it in salt water for eight hours. Layla wondered if steel would rust faster if she added vinegar to the salt water.
Layla cut ten squares of steel sheet metal. She... | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify control and experimental groups | Experiments have variables, or parts that change. You can design an experiment to investigate whether changing a variable between different groups has a specific outcome.
For example, imagine you want to find out whether adding fertilizer to soil affects the height of pea plants. You could investigate this question wit... | In this experiment, Layla investigated whether adding vinegar to salt water affects how quickly steel squares rust. So, the steel squares soaked in salt water and vinegar were part of an experimental group.
The steel squares soaked in salt water did not get vinegar. So, they were not part of an experimental group. | |
Which of the following statements describess living in an independent city-state? | [
"My city rules itself and is not part of a larger country.",
"All the decisions about my city are made by a faraway emperor.",
"I live by myself in the wilderness.",
"I vote for a president that rules over many different cities."
] | 0 | Athens was one of the most powerful independent city-states in ancient Greece. Look at the definitions below. Then answer the question. | closed choice | grade6 | social science | world-history | Greece | Classical Athens: geography and society | Look at the definitions.
Putting the definitions together, an independent city-state is a self-ruling city with its own government. So, a city-state rules itself and is not part of a larger country.
The ancient Greeks called a city-state a polis, which was the ancient Greek word for city. Today, the root word "polis" i... | ||
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is weaker in Pair 1.",
"The magnetic force is weaker in Pair 2."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade3 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You c... | Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker.
The magnets in Pair 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1. | |
Not supported with pagination yet | Based on this information, what is this fruit fly's genotype for the body color gene? | [
"BB",
"a gray body"
] | 0 | In a group of fruit flies, some individuals have a gray body and others have a black body. In this group, the gene for the body color trait has two alleles. The allele B is for a gray body, and the allele b is for a black body.
A certain fruit fly from this group has a gray body. This fly has two alleles for a gray bod... | closed choice | grade6 | natural science | biology | Genes to traits | Genetics vocabulary: genotype and phenotype | All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different ... | An organism's genotype for a gene is its combination of alleles for that gene. The fruit fly has two alleles for a gray body (B). So, the fly's genotype for the body color gene is BB. |
What is the capital of Kansas? | [
"Montgomery",
"Billings",
"Kansas City",
"Topeka"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Midwest | Topeka is the capital of Kansas. | |||
Not supported with pagination yet | How long is a basketball court? | [
"30 yards",
"30 feet"
] | 0 | Select the better estimate. | closed choice | grade2 | natural science | units-and-measurement | Units and measurement | Choose customary units of distance | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Imagine being told that a pencil is 8 long. You might be thinking, 8 what? Is the pencil 8 inches long? 8 feet? 8 miles?
The number 8 on its own does not give you much information about the len... | The better estimate for the length of a basketball court is 30 yards.
30 feet is too short. |
Which of the following was an independent variable in this experiment? | [
"the type of bed rail",
"the number of patients who got new infections"
] | 0 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Many types of bacteria cannot survive on objects made of copper. Dr. Duncan was considering using beds with copper bed rails instead of beds with plastic rails at the hospital where she worked. She wanted to k... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify independent and dependent variables | Experiments have variables, or parts that change. You can design an experiment to find out how one variable affects another variable. For example, imagine that you want to find out if fertilizer affects the number of tomatoes a tomato plant grows. To answer this question, you decide to set up two equal groups of tomato... | ||
Not supported with pagination yet | Which correctly shows the title of a movie? | [
"***Now You See Me***",
"\"Now You See Me\""
] | 0 | closed choice | grade9 | language science | punctuation | Formatting | Formatting titles | The title of a book, movie, play, TV show, magazine, or newspaper should be in italics. If you write it by hand, it can be underlined instead.
A Midsummer Night's Dream
The title of a poem, song, article, or short story should be in quotation marks.
"You Are My Sunshine" | A movie should be in italics.
The correct title is **Now You See Me**. | |
Which material is this bowl made of? | [
"rock",
"glass"
] | 1 | closed choice | grade2 | natural science | physics | Materials | Identify materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials. | Look at the picture of the bowl.
The bowl is made of glass.
Glass is a clear, breakable material. Some clear bowls are made of glass, and others are made of plastic. Plastic does not break as easily as glass does. | ||
Not supported with pagination yet | Complete the sentence.
The Fourth Amendment says that the government needs to have a good reason before it can () a person. | [
"hire",
"enslave",
"tax",
"search"
] | 3 | closed choice | grade4 | social science | civics | Government | The Bill of Rights | The Fourth Amendment says that the government needs to have a good reason before it can search a person or his or her property. The Fourth Amendment says that "unreasonable searches" are not allowed. It is not always clear what makes a search "unreasonable." But a search for no reason is definitely unreasonable! Police... | ||
Not supported with pagination yet | Which statement describes the asteroid's motion? | [
"The asteroid has a constant velocity.",
"The asteroid is accelerating."
] | 0 | An asteroid is flying directly toward Mars at a steady speed. | closed choice | grade8 | natural science | physics | Velocity, acceleration, and forces | Identify whether objects are accelerating | An object's velocity describes its speed and its direction.
An object has a constant velocity when neither its speed nor its direction is changing. So, an object has a constant velocity when the object is:
moving in a straight line at a constant speed, or
remaining motionless.
If an object does not have a constant velo... | The asteroid is moving in a straight line at a constant speed. So, the asteroid has a constant velocity. |
Not supported with pagination yet | Which figure of speech is used in this text?
You've reached Andy Conway's voice mail. Please leave a detailed message at the beep, and I will return your call at my earliest convenience. | [
"onomatopoeia",
"idiom"
] | 0 | closed choice | grade6 | language science | figurative-language | Literary devices | Classify figures of speech | Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive.
Alliteration is the repetition of sounds at the beginning of nearby words.
What a lucky little lady you are!
An allusion is a brief reference to something or someone well known, often from his... | The text uses onomatopoeia, a word that expresses a sound.
Beep represents the sound that tells the caller to start recording a message. | |
Select the chemical formula for this molecule. | [
"CH",
"C4H",
"C2H4",
"CH4"
] | 3 | closed choice | grade7 | natural science | chemistry | Atoms and molecules | Identify chemical formulas for ball-and-stick models | Every substance around you is made up of atoms. Atoms can link together to form molecules. The links between atoms in a molecule are called chemical bonds. Different molecules are made up of different chemical elements, or types of atoms, bonded together.
Scientists use both ball-and-stick models and chemical formulas ... | C is the symbol for carbon. According to the legend, carbon atoms are shown in dark gray. H is the symbol for hydrogen. According to the legend, hydrogen atoms are shown in light gray. This ball-and-stick model shows a molecule with one carbon atom and four hydrogen atoms. The chemical formula will contain the symbols ... | ||
Not supported with pagination yet | What is the mass of an elephant? | [
"5,220 grams",
"5,220 kilograms"
] | 1 | Select the better estimate. | closed choice | grade5 | natural science | units-and-measurement | Units and measurement | Choose metric units of mass | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Mass is a measurement of how much matter something contains.
There are many different units of mass. When you are using metric units, mass may be written with units of grams or kilograms.
There... | The better estimate for the mass of an elephant is 5,220 kilograms.
5,220 grams is too light. |
Not supported with pagination yet | Which word is not like the others? | [
"cent",
"dollar",
"penny",
"buy"
] | 3 | closed choice | grade2 | language science | vocabulary | Categories | Which word is not like the others? | Some words are alike. They go together in a group.
Red, blue, and green go together. They are colors.
Mom, dad, grandma, and grandpa go together. They are people in a family. | Cent, penny, and dollar go together. They are money. Buy is not money, so it is not like the other words. | |
Not supported with pagination yet | Select the one true statement. | [
"Chromosomes store nutrients, water, and waste in an animal cell.",
"The vacuoles of an animal cell use sunlight to make sugar.",
"In a plant cell, the endoplasmic reticulum helps ribosomes build proteins."
] | 2 | closed choice | grade7 | natural science | biology | Cells | Compare cells and cell parts | |||
Not supported with pagination yet | Based on this information, what is this plant's phenotype for the flower position trait? | [
"terminal flowers",
"axial flowers"
] | 0 | This passage describes the flower position trait in pea plants:
In a group of pea plants, some individuals have axial flowers and others have terminal flowers. In this group, the gene for the flower position trait has two alleles. The allele for terminal flowers (f) is recessive to the allele for axial flowers (F).
A ... | closed choice | grade8 | natural science | biology | Genes to traits | Genetics vocabulary: dominant and recessive | All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different ... | The pea plant's genotype for the flower position gene is ff. The pea plant's genotype of ff has only f alleles. The f allele is for terminal flowers. So, the pea plant's phenotype for the flower position trait must be terminal flowers.
To check this answer, consider whether the pea plant's alleles are dominant or reces... |
Which ocean is highlighted? | [
"the Arctic Ocean",
"the Pacific Ocean",
"the Southern Ocean",
"the Indian Ocean"
] | 3 | closed choice | grade8 | social science | geography | Physical Geography | Oceans and continents | Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean. | This is the Indian Ocean. | ||
What is the capital of Utah? | [
"Salt Lake City",
"Fairbanks",
"Provo",
"Boise"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Salt Lake City is the capital of Utah. | |||
Not supported with pagination yet | What do these two changes have in common?
bending a paper clip
mixing sand and water | [
"Both are chemical changes.",
"Both are caused by cooling.",
"Both are caused by heating.",
"Both are only physical changes."
] | 3 | closed choice | grade3 | natural science | chemistry | Physical and chemical change | Compare physical and chemical changes | Chemical changes and physical changes are two common ways matter can change.
In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different.
Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change c... | Step 1: Think about each change.
Bending a paper clip is a physical change. After you bend it, the paper clip has a different shape. But it is still made of the same type of matter.
Mixing sand and water is a physical change. Adding water makes the sand wet. But both the sand and water are still made of the same type o... | |
Not supported with pagination yet | Would you find the word tangle on a dictionary page with the following guide words?
throttle - truth | [
"yes",
"no"
] | 1 | yes or no | grade6 | language science | reference-skills | Reference skills | Use guide words | Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order.
To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second let... | Put the words in alphabetical order.
Since tangle is not between the guide words throttle - truth, it would not be found on that page. | |
Not supported with pagination yet | Which word is not like the others? | [
"cent",
"dollar",
"penny",
"sell"
] | 3 | closed choice | grade2 | language science | vocabulary | Categories | Which word is not like the others? | Some words are alike. They go together in a group.
Red, blue, and green go together. They are colors.
Mom, dad, grandma, and grandpa go together. They are people in a family. | Dollar, cent, and penny go together. They are money. Sell is not money, so it is not like the other words. | |
Not supported with pagination yet | Is this a sentence fragment?
By the time the Guerra Bianca, or White War, ended in 1917, Italian and Austro-Hungarian soldiers fighting for three years in extreme conditions at altitudes of up to twelve thousand feet. | [
"no",
"yes"
] | 1 | yes or no | grade12 | language science | writing-strategies | Sentences, fragments, and run-ons | Identify sentence fragments | A sentence is a group of words that expresses a complete thought.
The band I'm in has been rehearsing daily because we have a concert in two weeks.
A sentence fragment is a group of words that does not express a complete thought.
Rehearsing daily because we have a concert in two weeks.
This fragment is missing a subjec... | This is a sentence fragment. It does not express a complete thought.
By the time the Guerra Bianca, or White War, ended in 1917, Italian and Austro-Hungarian soldiers fighting for three years in extreme conditions at altitudes of up to twelve thousand feet.
Here is one way to fix the sentence fragment:
By the time the ... | |
Not supported with pagination yet | What do these two changes have in common?
ice melting in a glass
molding clay into the shape of a pot | [
"Both are caused by cooling.",
"Both are caused by heating.",
"Both are only physical changes.",
"Both are chemical changes."
] | 2 | closed choice | grade3 | natural science | chemistry | Physical and chemical change | Compare physical and chemical changes | Chemical changes and physical changes are two common ways matter can change.
In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different.
Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change c... | Step 1: Think about each change.
Ice melting in a glass is a change of state. So, it is a physical change. The solid ice becomes liquid, but it is still made of water. A different type of matter is not made.
Molding clay into the shape of a pot is a physical change. The clay gets a different shape. But it is made of th... | |
Which of these states is farthest south? | [
"Rhode Island",
"Idaho",
"Wisconsin",
"Indiana"
] | 3 | closed choice | grade4 | social science | geography | Maps | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Indiana is farthest south. | ||
Not supported with pagination yet | Which object has the most thermal energy? | [
"a 150-gram glass of water at a temperature of 42°F",
"a 150-gram glass of water at a temperature of 85°F",
"a 150-gram glass of water at a temperature of 56°F"
] | 1 | The objects are identical except for their temperatures. | closed choice | grade4 | natural science | physics | Heat and thermal energy | How is temperature related to thermal energy? | All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy.
Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both ... | All three glasses of water have the same mass but different temperatures. Since the 85°F glass of water is the hottest, it has the most thermal energy. |
What is the capital of New Jersey? | [
"Knoxville",
"Jersey City",
"Trenton",
"Dover"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Trenton is the capital of New Jersey. | |||
Not supported with pagination yet | What is the temperature of a pot of boiling soup? | [
"215°C",
"215°F"
] | 1 | Select the better estimate. | closed choice | grade7 | natural science | units-and-measurement | Units and measurement | Estimate temperatures | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Temperature can be written with units of degrees Fahrenheit (°F) or Celsius (°C). Use the list below to compare the two units.
212°F | Water boils | 100°C
98.6°F | Body temperature | 37°C
68°F ... | The better estimate for the temperature of a pot of boiling soup is 215°F.
215°C is too hot. |
What is the capital of Massachusetts? | [
"Boston",
"Cambridge",
"Providence",
"Reno"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Boston is the capital of Massachusetts. | |||
Not supported with pagination yet | Which text uses the word terribly in its traditional sense? | [
"Arianna decided to make escargots using the small snails from her garden, but she prepared them terribly. Since she'd forgotten to add garlic, the taste was disappointing.",
"Arianna made escargots using the small snails from her garden. She prepared them according to the recipe but found the chewy texture terri... | 0 | closed choice | grade12 | language science | writing-strategies | Word usage and nuance | Explore words with new or contested usages | Words change in meaning when speakers begin using them in new ways. For example, the word peruse once only meant to examine in detail, but it's now also commonly used to mean to look through in a casual manner.
When a word changes in meaning, its correct usage is often debated. Although a newer sense of the word may be... | The first text uses terribly in its traditional sense: in a terrible manner.
Arianna decided to make escargots using the small snails from her garden, but she prepared them terribly. Since she'd forgotten to add garlic, the taste was disappointing.
The second text uses terribly in its nontraditional sense: extremely; v... | |
Not supported with pagination yet | Complete the statement.
Lithium chloride is (). | [
"an elementary substance",
"a compound"
] | 1 | Lithium chloride can be used to create red fireworks. The chemical formula for lithium chloride is LiCl. | closed choice | grade8 | natural science | chemistry | Atoms and molecules | Classify elementary substances and compounds using chemical formulas | There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you.
A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are ... | You can tell whether lithium chloride is an elementary substance or a compound by counting the number of atomic symbols in its chemical formula. An atomic symbol consists of either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for lithium chloride, LiCl, contains ... |
Not supported with pagination yet | Select the invertebrate. | [
"pipevine swallowtail butterfly",
"human",
"whiptail lizard",
"cockatoo"
] | 0 | Hint: Insects, spiders, and worms are invertebrates. | closed choice | grade5 | natural science | biology | Classification | Identify vertebrates and invertebrates | Vertebrates and invertebrates are both groups of animals.
A vertebrate has a backbone. The backbone is made of many bones in an animal's back. A vertebrate's backbone helps connect the different parts of its body. In the drawings below, each vertebrate's backbone is colored orange.
An invertebrate does not have a backb... | A whiptail lizard is a reptile. Like other reptiles, a whiptail lizard is a vertebrate. It has a backbone.
A cockatoo is a bird. Like other birds, a cockatoo is a vertebrate. It has a backbone.
A human is a mammal. Like other mammals, a human is a vertebrate. It has a backbone.
A pipevine swallowtail butterfly is an in... |
Not supported with pagination yet | What is the volume of a large soup pot? | [
"6 liters",
"6 milliliters"
] | 0 | Select the better estimate. | closed choice | grade4 | natural science | units-and-measurement | Units and measurement | Choose metric units of volume | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Volume is a measurement of how much space something takes up.
There are many different units of volume. When you are using metric units, volume may be written in units of milliliters or liters.... | The better estimate for the volume of a large soup pot is 6 liters.
6 milliliters is too little. |
Which continent is highlighted? | [
"South America",
"Antarctica",
"Africa",
"Europe"
] | 3 | closed choice | grade6 | social science | geography | Physical Geography | Oceans and continents | A continent is one of the major land masses on the earth. Most people say there are seven continents. | This continent is Europe. | ||
Not supported with pagination yet | Which would stretch more? | [
"rock",
"nylon swim shorts"
] | 1 | closed choice | grade2 | natural science | physics | Materials | Compare properties of materials | Every object is made of one or more materials. A material is a type of matter. Wood, glass, metal, and plastic are common materials.
A material has different properties. A material's properties tell you how it looks, feels, tastes, or smells. | Stretchy is a property. A stretchy material gets longer when you pull on it.
Look at each picture, one at a time. Imagine pulling on the material shown in each picture.
Of the choices, the nylon swim shorts would stretch more. If you pull the leg opening on a pair of nylon swim shorts, it will get wider. | |
What is the expected ratio of offspring with curly fur to offspring with straight fur? Choose the most likely ratio. | [
"0:4",
"2:2",
"1:3",
"4:0",
"3:1"
] | 1 | In a group of cats, some individuals have straight fur and others have curly fur. In this group, the gene for the fur type trait has two alleles. The allele for straight fur (F) is dominant over the allele for curly fur (f).
This Punnett square shows a cross between two cats. | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate ratios of offspring types | Offspring phenotypes: dominant or recessive?
How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to a... | To determine how many boxes in the Punnett square represent offspring with curly fur or straight fur, consider whether each phenotype is the dominant or recessive allele's version of the fur type trait. The question tells you that the F allele, which is for straight fur, is dominant over the f allele, which is for curl... | |
Which type of force from the bulldozer clears the path? | [
"push",
"pull"
] | 0 | A bulldozer clears a path for a new road. The bulldozer applies a force to the loose dirt in front of the blade. | closed choice | grade3 | natural science | physics | Force and motion | Identify pushes and pulls | A force is a push or a pull that one object applies to a second object.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The bulldozer applies a force to the loose dirt and clears the path. The direction of this force is away from the bulldozer. This force is a push. | |
Not supported with pagination yet | Which greeting is correct for a letter? | [
"Dear dr. McKnight,",
"Dear Dr. McKnight,"
] | 1 | closed choice | grade3 | language science | punctuation | Formatting | Greetings and closings of letters | A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue.
Dear Aunt Sue,
I'm glad you could come to my party, and
thank you for the birthday gift. I could not have
asked for a better one! Every time I... | The first greeting is correct:
Its first word is capitalized, and it ends with a comma. Dr. McKnight is capitalized because it is a proper noun. | |
Not supported with pagination yet | What do these two changes have in common?
an old sandwich rotting in a trashcan
baking cookies | [
"Both are only physical changes.",
"Both are chemical changes.",
"Both are caused by cooling.",
"Both are caused by heating."
] | 1 | closed choice | grade4 | natural science | chemistry | Physical and chemical change | Compare physical and chemical changes | Chemical changes and physical changes are two common ways matter can change.
In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different.
Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change c... | Step 1: Think about each change.
A sandwich rotting is a chemical change. The matter in the sandwich breaks down and slowly turns into a different type of matter.
Baking cookies is a chemical change. The type of matter in the cookie dough changes when it is baked. The cookie dough turns into cookies!
Step 2: Look at ea... | |
Not supported with pagination yet | What is the source of the allusion in the sentence below?
Ben says that he would not be the person he is today were it not for his childhood, which he describes as Dickensian. | [
"a song",
"literature"
] | 1 | closed choice | grade10 | language science | figurative-language | Literary devices | Recall the source of an allusion | An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words.
"I'd better get home before I turn into a pumpkin!" Lila remarked.
Here, Lila alludes to the fairy tale "Cinderella," in which C... | The source of the allusion Dickensian is literature.
The works of British author Charles Dickens often featured characters struggling to survive in settings such as debtors' prisons and orphanages.
The allusion Dickensian means harsh or poverty-stricken. | |
Not supported with pagination yet | Select the amphibian. | [
"black howler",
"red-headed poison frog",
"salmon",
"thresher shark"
] | 1 | closed choice | grade5 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Amphibians have moist skin and begin their lives in water. | A red-headed poison frog is an amphibian. It has moist skin and begins its life in water.
Poison dart frogs come in many bright colors. Their bright color warns other animals that these frogs are poisonous.
A black howler is a mammal. It has hair and feeds its young milk.
Howler monkeys have loud calls, or howls. Their... | |
Not supported with pagination yet | What do these two changes have in common?
water evaporating from a lake
dry ice sublimating and becoming a gas | [
"Both are caused by cooling.",
"Both are caused by heating.",
"Both are chemical changes."
] | 1 | closed choice | grade7 | natural science | chemistry | Chemical reactions | Compare physical and chemical changes | Matter is made of very small particles called atoms. Atoms can be linked together by chemical bonds. When two or more atoms link together, they form a molecule.
In a chemical change, the chemical bonds in the molecules break. The atoms then link together to form different molecules. The types of molecules in matter bef... | Step 1: Think about each change.
Water evaporating from a lake is a change of state. So, it is a physical change. The liquid changes into a gas, but a different type of matter is not formed.
Dry ice is solid carbon dioxide. When dry ice gets warm, it changes state and becomes carbon dioxide gas. This change of state, f... | |
Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 1 | Two magnets are placed as shown.
Hint: Magnets that attract pull together. Magnets that repel push apart. | closed choice | grade2 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of magnets.... | Will these magnets attract or repel? To find out, look at which poles are closest to each other.
The north pole of one magnet is closest to the south pole of the other magnet. Poles that are different attract. So, these magnets will attract each other. | |
What can Brennan and Ed trade to each get what they want? | [
"Brennan can trade his tomatoes for Ed's broccoli.",
"Brennan can trade his tomatoes for Ed's carrots.",
"Ed can trade his broccoli for Brennan's oranges.",
"Ed can trade his almonds for Brennan's tomatoes."
] | 0 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Brennan and Ed open their lunch boxes in the school cafeteria. Neither Brennan nor Ed got everything that they wanted. The table ... | closed choice | grade7 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Brennan wants broccoli. Ed wants tomatoes. They can trade tomatoes for broccoli to both get what they want. Trading other things would not help both people get more items they want. | ||
Not supported with pagination yet | Last year, 50,000 people lived in the city of Riverside. But since then, 8,000 people have moved away. What probably happened to the overall supply of houses for sale in Riverside? | [
"The supply probably went down.",
"The supply probably went up."
] | 1 | closed choice | grade5 | social science | economics | Supply and demand | Understand overall supply and demand | Overall supply is the total amount of a good or service that producers make and sell. There are several things that can make overall supply go up or down. The table below shows how changes to these things might affect overall supply.
| Resources | Number of producers or suppliers | Expected change in demand
Supply goe... | The population of Riverside fell by 8,000 people. Many of the people who have left are probably trying to sell their houses. Since more people are trying to sell their houses, the number of suppliers of houses for sale in Riverside has gone up. So, the supply of houses for sale probably went up, too. | |
Not supported with pagination yet | Which object has more thermal energy? | [
"a 125-gram glass of grape juice at a temperature of 5°C",
"a 125-gram glass of grape juice at a temperature of 20°C"
] | 1 | The objects are identical except for their temperatures. | closed choice | grade3 | natural science | physics | Heat and thermal energy | How is temperature related to thermal energy? | All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy.
Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both ... | The two glasses of grape juice have the same mass but different temperatures. Since the 20°C glass of grape juice is hotter than the 5°C glass of grape juice, it has more thermal energy. |
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is smaller in Pair 1.",
"The magnitude of the magnetic force is smaller in Pair 2.",
"The magnitude of the magnetic force is the same in both pairs."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes. | closed choice | grade6 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same.
So, the magnitude of the magnetic force is the same in both pairs. | |
What is the capital of West Virginia? | [
"Louisville",
"Charleston",
"Baton Rouge",
"Huntington"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. | |||
Select the organism in the same genus as the Japanese tree frog. | [
"Lonicera japonica",
"Strix nebulosa",
"Hyla cinerea"
] | 2 | This organism is a Japanese tree frog. Its scientific name is Hyla japonica. | closed choice | grade5 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A Japanese tree frog's scientific name is Hyla japonica. The first word of its scientific name is Hyla.
Hyla cinerea is in the genus Hyla. The first word of its scientific name is Hyla. So, Hyla cinerea and Hyla japonica are in the same genus.
Lonicera japonica and Hyla japonica are not in the same genus.
These organis... | |
Not supported with pagination yet | Which logical fallacy is used in the text?
The number of off-leash dogs I've seen in Silvergrove is completely unacceptable. Let's make our streets safe again by addressing this dog problem, before our city becomes a haven for criminals. | [
"false dichotomy: an argument that presents only two choices when more options exist",
"red herring: the use of a completely unrelated topic or idea"
] | 1 | closed choice | grade7 | language science | writing-strategies | Developing and supporting arguments | Classify logical fallacies | A strong argument uses valid reasoning and logic in support of a claim. When an argument or claim introduces irrelevant information or misrepresents the issues at hand, it may be committing a logical fallacy. Logical fallacies can hurt a writer's credibility and can lead readers to draw false conclusions.
A logical fal... | The text argues that off-leash dogs would somehow cause an increase in crime in Silvergrove. However, these two ideas aren't related. This illustrates a type of logical fallacy known as a red herring. | |
Which of the following could Joseph's test show? | [
"how many solar panels could fit on each side of the roof",
"the amount of sunlight the roof would get throughout the year",
"which side of the roof got more sun over one day"
] | 2 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the ques... | closed choice | grade7 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a... | ||
Is Bertholletia excelsa made up of many cells? | [
"yes",
"no"
] | 0 | This organism is Bertholletia excelsa. It is a member of the plant kingdom.
Bertholletia excelsa is commonly called a Brazil nut tree. Brazil nut trees have a tall, thin trunk. Branches grow near the top of the tree. A Brazil nut tree can live for over 500 years! | yes or no | grade4 | natural science | biology | Classification | Describe, classify, and compare kingdoms | In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms.
Organisms in each kingdom have specific traits. The table below sho... | Bertholletia excelsa is a plant. Plants are made up of many cells. | |
Complete the statement.
Bromine is (). | [
"an elementary substance",
"a compound"
] | 0 | The model below represents a molecule of bromine. Liquid bromine is made in chemical factories. It can be used to make couches and mattresses that are fire-resistant. | closed choice | grade7 | natural science | chemistry | Atoms and molecules | Classify elementary substances and compounds using models | There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you.
A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are ... | Use the model to determine whether bromine is an elementary substance or a compound.
Step 1: Interpret the model.
In the ball-and-stick model shown above, both of the balls are the same color:
. The legend shows that dark red represents the chemical element with the atomic symbol Br. So, the model shows you that a mole... | |
Not supported with pagination yet | Is there a sentence fragment?
Spring and fall—the best times to enjoy the lake and avoid the crowds of summer. No fees or permits are required then. | [
"no",
"yes"
] | 1 | yes or no | grade12 | language science | writing-strategies | Sentences, fragments, and run-ons | Identify sentence fragments | A sentence is a group of words that expresses a complete thought.
The band I'm in has been rehearsing daily because we have a concert in two weeks.
A sentence fragment is a group of words that does not express a complete thought.
Rehearsing daily because we have a concert in two weeks.
This fragment is missing a subjec... | There is a sentence fragment that does not express a complete thought.
Spring and fall—the best times to enjoy the lake and avoid the crowds of summer. No fees or permits are required then.
Here is one way to fix the sentence fragment:
Spring and fall are the best times to enjoy the lake and avoid the crowds of summer.... | |
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample A",
"sample B",
"neither; the samples have the same temperature"
] | 0 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | Each particle in sample A has more mass than each particle in sample B. The particles in sample A also have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average ... | |
Not supported with pagination yet | Which change best matches the sentence?
A large amount of rock and soil tumbles down a slope. | [
"deposition",
"landslide",
"drought"
] | 1 | closed choice | grade3 | natural science | earth-science | Earth events | Classify changes to Earth's surface II |
Subsets and Splits
Validation Subject & Topic Summary
Reveals the distribution and count of images across different subjects, topics, and categories, highlighting the most prevalent combinations.
SQL Console for derek-thomas/ScienceQA
This query provides a balanced sample of entries across different topics where images are missing, allowing for a more representative analysis of text-only data.
SQL Console for derek-thomas/ScienceQA
This query provides a balanced sample of text entries across different topics, ensuring that each topic is proportionally represented, which is useful for further analysis or model training.
Random Sample by Topic Ratio
This query balances the dataset by randomly selecting a proportional number of items from each topic to create a balanced subset of 3000 items, revealing how well-represented each topic is in the dataset.
Topic Counts by Grade
Provides a breakdown of the number of questions by topic (physics, chemistry, biology, geography) for each grade level, revealing the distribution of question types.
Validation Category Counts
Counts the number of unique questions per category, helping to understand the distribution of questions across different categories.
SQL Console for derek-thomas/ScienceQA
Identifies categories, questions, and answers that appear more than four times in the validation dataset with images, highlighting common or repetitive entries.
ScienceQA Validation Grouped Data
Provides a count of images and overall occurrences for each combination of subject, topic, category, and answer, helping to identify popular or common configurations.
Train Data with Numeric Choices
This query identifies distinct rows in the dataset where one of the elements in the choices column contains a number and the image column is null, providing insight into data completeness and specific patterns in the choices.
Physics Train with Images and Lectures
Retrieves physics educational records with images and lectures for specific grade levels, providing basic filtering but offering limited analytical insight beyond data availability.
Physics Q&As with Images
Retrieves physics-related training examples with images for specific grade levels, providing basic filtered data but offering limited analytical insight beyond simple categorization.
Physics Questions Gr 2-6 With Images
Retrieves physics-related test items with images for specific grade levels, providing basic filtered data but offering limited analytical insights beyond simple data retrieval.
Filter Text-only Train Questions
Retrieves questions and related metadata from the dataset excluding those with images, offering basic data filtering.
Skills Without Images
Counts the number of skills where the image is missing, providing a basic overview of incomplete data.
Top 10 Hard Text Questions
Retrieves the top 10 longest questions without images, ordered by grade level in descending order, providing basic insight into potentially more complex questions.
SQL Console for derek-thomas/ScienceQA
Counts the occurrences of each category, question, and answer combination where an image is present, providing basic filtering on the dataset.
List ScienceQA Topics
Lists all unique topics in the dataset, which provides a basic overview of the categories present.
Cultural Questions Without Images
Retrieves 100 entries from the 'train' dataset where the image is missing and the topic is 'culture', providing basic filtering with limited analytical value.
Biology Skills for Grades 2 & 3
Lists unique skills and categories for biology topics in grades 2 and 3, providing basic filtering of the dataset.
Biology Qs for Grades 2 &
Retrieves all entries for grade 2 and grade 3 students focusing on the biology topic, providing a basic filtered view of the dataset.
Biology Grade 3 Questions Count
Counts the number of entries for grade 3 students in the biology topic, providing a basic count of data points.
Select Test Rows With Images
The query retrieves all records from the 'test' table where the 'image' column is not null, providing basic filtering without deep analytical value.
Test Images Query
This query retrieves a limited sample of rows where the image column is not null, providing basic filtering but minimal analytical value.
Test Data with Images
The query filters out rows where the image column is not null, providing a basic subset of the data but without much analytical insight.
Select Test Entries With Images
The query retrieves all records from the 'test' table where the 'image' column is not null, providing basic filtering but no deeper analytical insight.