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train/800 | Which country is highlighted? | [
"New Zealand",
"Fiji",
"Vanuatu",
"Solomon Islands"
] | 3 | closed choice | grade8 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Solomon Islands. | ||
train/801 | Which property matches this object? | [
"fragile",
"colorful"
] | 1 | Select the better answer. | closed choice | grade3 | 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. Properties can also tell you how an object will behave when something happens to it. | Look at the object.
Think about each property.
A colorful object has one or more bright colors. The inflatable castle is colorful.
A fragile object will break into pieces if you drop it. The inflatable castle is not fragile. |
train/802 | Is a sidewalk a solid, a liquid, or a gas? | [
"a gas",
"a solid",
"a liquid"
] | 1 | closed choice | grade4 | natural science | physics | States of matter | Identify and sort solids, liquids, and gases | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a... | A sidewalk is a solid. A solid has a size and shape of its own.
A sidewalk has a size and shape of its own, even when you step on it. | |
train/803 | What is the capital of Washington? | [
"Phoenix",
"Seattle",
"Sacramento",
"Olympia"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Olympia is the capital of Washington. | ||
train/804 | Which solution has a higher concentration of yellow particles? | [
"neither; their concentrations are the same",
"Solution B",
"Solution A"
] | 2 | The diagram below is a model of two solutions. Each yellow ball represents one particle of solute. | closed choice | grade8 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the yellow particles represent the solute. To figure out which solution has a higher concentration of yellow particles, look at both the number of yellow particles and the volume of the solvent in each container.
Use the concentration formula to find the number of yellow particles per mill... |
train/805 | Which month is the hottest on average in Rome? | [
"October and November",
"December, January, and February",
"July and August"
] | 2 | Use the graph to answer the question below. | closed choice | grade4 | natural science | earth-science | Weather and climate | Use climate data to make predictions | Scientists record climate data from places around the world. Temperature is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average temperature for each month. The average temperature can be used to describe the climate of a location.
A line graph can be used t... | To describe the average temperature trends in Rome, look at the graph.
Choice "Feb" is incorrect.
Choice "Jul" is incorrect.
Choice "Aug" is incorrect.
Choice "Oct" is incorrect.
Choice "Nov" is incorrect.
Choice "Dec" is incorrect.
Choice "Jan" is incorrect.
The average temperatures in July and August are around 23°C.... |
train/806 | What is the capital of Rhode Island? | [
"Providence",
"Newport",
"Richmond",
"Boston"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Northeast | Providence is the capital of Rhode Island. | ||
train/807 | Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 1 | Two magnets are placed as shown. | closed choice | grade4 | 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: north and south.
Here are some examples of magnets. The no... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The south pole of one magnet is closest to the north pole of the other magnet. Opposite poles attract. So, these magnets will attract each other. |
train/808 | Which continent is highlighted? | [
"Asia",
"South America",
"Africa",
"Europe"
] | 2 | closed choice | grade5 | social science | geography | Oceans and continents | Identify 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 Africa. | |
train/809 | Which property do these four objects have in common? | [
"opaque",
"hard",
"slippery"
] | 0 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
An opaque object does not let light through. All four objects are opaque.
A slippery object is hard to hold onto or stand on. The ball of wet clay is slippery, but the rubber band is not.
A hard object does not change shape when pressed or squeezed. ... |
train/810 | What is the capital of Nebraska? | [
"Saint Paul",
"Pierre",
"Topeka",
"Lincoln"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Midwest | Lincoln is the capital of Nebraska. | ||
train/811 | Which of the following could Colleen and Amelia's test show? | [
"if the concrete from each batch took the same amount of time to dry",
"if a new batch of concrete was firm enough to use"
] | 1 | 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 | grade6 | 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... | |
train/812 | Complete the sentence.
Grasshoppers can () to stay safe. | [
"jump and fly",
"get smaller",
"change colors"
] | 0 | Read the first part of the passage about grasshoppers.
Grasshoppers have many ways to stay safe. They are great jumpers. They can fly, too.
Grasshoppers use their back legs to jump into the air. Their back legs are big. So, grasshoppers can jump high and far. Then, they can fly away. | closed choice | grade1 | language science | reading-comprehension | Read-alone texts | Read passages about animals | The passage says that grasshoppers have many ways to stay safe. They can jump high and far. And they can fly away. This tells you they can jump and fly to stay safe. | |
train/813 | What is the name of the colony shown? | [
"Vermont",
"New York",
"Indiana",
"Maryland"
] | 3 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Maryland. | ||
train/814 | Which solution has a higher concentration of blue particles? | [
"neither; their concentrations are the same",
"Solution A",
"Solution B"
] | 2 | The diagram below is a model of two solutions. Each blue ball represents one particle of solute. | closed choice | grade6 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container.
Use the concentration formula to find the number of blue particles per milliliter.
... |
train/815 | Which solution has a higher concentration of blue particles? | [
"Solution B",
"neither; their concentrations are the same",
"Solution A"
] | 0 | The diagram below is a model of two solutions. Each blue ball represents one particle of solute. | closed choice | grade8 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container.
Use the concentration formula to find the number of blue particles per milliliter.
... |
train/816 | What can Bryan and Noah trade to each get what they want? | [
"Bryan can trade his tomatoes for Noah's carrots.",
"Noah can trade his almonds for Bryan's tomatoes.",
"Bryan can trade his tomatoes for Noah's broccoli.",
"Noah can trade his broccoli for Bryan's oranges."
] | 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.
Bryan and Noah open their lunch boxes in the school cafeteria. Neither Bryan nor Noah got everything that they wanted. The table ... | closed choice | grade8 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Bryan wants broccoli. Noah 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. | |
train/817 | Which solution has a higher concentration of blue particles? | [
"Solution A",
"Solution B",
"neither; their concentrations are the same"
] | 1 | The diagram below is a model of two solutions. Each blue ball represents one particle of solute. | closed choice | grade6 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container.
Use the concentration formula to find the number of blue particles per milliliter.
... |
train/818 | What is the expected ratio of offspring with pale orange cheeks to offspring with bright orange cheeks? Choose the most likely ratio. | [
"2:2",
"1:3",
"0:4",
"3:1",
"4:0"
] | 1 | In a group of cockatiels, some individuals have bright orange cheeks and others have pale orange cheeks. In this group, the gene for the cheek color trait has two alleles. The allele for pale orange cheeks (r) is recessive to the allele for bright orange cheeks (R).
This Punnett square shows a cross between two cockati... | 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 pale orange cheeks or bright orange cheeks, consider whether each phenotype is the dominant or recessive allele's version of the cheek color trait. The question tells you that the r allele, which is for pale orange cheeks, is recessive to the R ... |
train/819 | Select the mammal below. | [
"piranha",
"koala"
] | 1 | Mammals have hair or fur and feed their young milk. A giraffe is an example of a mammal. | closed choice | grade3 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common.
Scientists sort animals into groups based on traits they have in common. This process is called classification. | A koala is a mammal. It has fur and feeds its young milk.
Koalas sleep for up to 20 hours a day!
A piranha is a fish. It lives underwater. It has fins, not limbs.
Piranhas have sharp teeth. Piranhas hunt in groups. A group of piranhas can eat a large animal. |
train/820 | Select the organism in the same species as the pickerel frog. | [
"Lithobates palustris",
"Atelopus zeteki",
"Bufo guttatus"
] | 0 | This organism is a pickerel frog. Its scientific name is Lithobates palustris. | 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 pickerel frog's scientific name is Lithobates palustris.
Atelopus zeteki does not have the same scientific name as a pickerel frog. So, Lithobates palustris and Atelopus zeteki are not in the same species.
Lithobates palustris has the same scientific name as a pickerel frog. So, these organisms are in the same specie... |
train/821 | In this experiment, which were part of an experimental group? | [
"the cups that got cardboard sleeves",
"the cups that did not get cardboard sleeves"
] | 0 | The passage below describes an experiment.
Justin drank coffee out of a paper cup. He remembered that his coffee shop had cardboard sleeves for their coffee cups. He wondered if using a sleeve would help keep the coffee warm.
Justin placed a cardboard sleeve on each of three paper cups. He left three other cups withou... | 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, Justin investigated whether adding cardboard sleeves to coffee cups affects how quickly coffee cools. So, the cups that got cardboard sleeves were part of an experimental group.
There were no sleeves on the cups that did not get cardboard sleeves. So, they were not part of an experimental group. |
train/822 | Which of these states is farthest north? | [
"Mississippi",
"Indiana",
"Maryland",
"Montana"
] | 3 | closed choice | grade3 | social science | geography | Geography | 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 north arrow is pointing. Montana is farthest north. | |
train/823 | What is the capital of Connecticut? | [
"Trenton",
"New Haven",
"Hartford",
"Bridgeport"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Hartford is the capital of Connecticut. | ||
train/824 | Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 1 | Two magnets are placed as shown. | closed choice | grade4 | 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: north and south.
Here are some examples of magnets. The no... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The north pole of one magnet is closest to the north pole of the other magnet. Like poles repel. So, these magnets will repel each other. |
train/825 | Which property do these four objects have in common? | [
"sticky",
"fragile",
"opaque"
] | 1 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
An opaque object does not let light through. The ceramic plate is opaque, but the glass flask, the glass, and the icicle are not.
A fragile object will break into pieces if you drop it. All four objects are fragile.
A sticky object can attach or stic... |
train/826 | Which property matches this object? | [
"opaque",
"fragile"
] | 1 | Select the better answer. | closed choice | grade3 | 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. Properties can also tell you how an object will behave when something happens to it. | Look at the object.
Think about each property.
An opaque object does not let light through. The fish bowl is not opaque.
A fragile object will break into pieces if you drop it. The fish bowl is fragile. |
train/827 | What is the capital of North Carolina? | [
"Charlotte",
"Bismarck",
"Columbia",
"Raleigh"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Raleigh is the capital of North Carolina. | ||
train/828 | Why do stick insects look like sticks? | [
"so they can hide on trees",
"so birds can find them more easily"
] | 0 | Read the passage about stick insects.
Stick insects are a tasty snack for birds and other animals. But these bugs have a tricky way to hide. They look like sticks! This makes them hard to spot in the trees where they live. They also don't move much.
Stick insects have another neat trick. If a bird grabs one by the leg,... | closed choice | grade2 | language science | reading-comprehension | Independent reading comprehension | Read and understand informational passages | Look at the passage. It tells you why stick insects look like sticks.
Stick insects are a tasty snack for birds and other animals. But these bugs have a tricky way to hide. They look like sticks! This makes them hard to spot in the trees where they live. They also don't move much. | |
train/829 | 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 2.",
"The magnitude of the magnetic force is smaller in Pair 1.",
"The magnitude of the magnetic force is the same in both pairs."
] | 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 sizes. | closed choice | grade8 | 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,... | Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The smaller the magnets, the smaller the magnitude of the magnetic force between them.
Magnet A is the same size in both pairs. But Magnet B is smaller in Pair 1 than in Pair 2. So, the magnit... |
train/830 | Which of the following was an independent variable in this experiment? | [
"the distance the footballs traveled",
"the air pressure in the footballs"
] | 1 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Bryce noticed that some of the footballs his team used during practice were not fully inflated. He wondered whether fully inflated footballs would travel farther than footballs with a lower air pressure.
To fi... | closed choice | grade7 | 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... | |
train/831 | Which is this organism's common name? | [
"tiger shark",
"Galeocerdo cuvier"
] | 0 | This organism is Galeocerdo cuvier. It is also called a tiger shark. | closed choice | grade7 | natural science | biology | Classification and scientific names | Identify common and scientific names | An organism's common name is the name that people normally call the organism. Common names often contain words you know.
An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English.
Scientific names are written in italics,... | Galeocerdo cuvier is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name.
Galeocerdo cuvier is the organism's scientific name. So, you know that tiger shark is the common name. |
train/832 | Which property do these two objects have in common? | [
"scratchy",
"colorful"
] | 0 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells.
Different objects can have the same properties. You can use these properties to put objects into groups. | Look at each object.
For each object, decide if it has that property.
A scratchy object is rough and itchy against your skin. Both objects are scratchy.
A colorful object has one or more bright colors. Neither of the objects are colorful.
The property that both objects have in common is scratchy. |
train/833 | Select the organism in the same genus as the European green toad. | [
"Hyla cinerea",
"Bufo bufo",
"Atelopus zeteki"
] | 1 | This organism is a European green toad. Its scientific name is Bufo viridis. | closed choice | grade4 | 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 European green toad's scientific name is Bufo viridis. The first word of its scientific name is Bufo.
Atelopus zeteki is in the genus Atelopus. The first word of its scientific name is Atelopus. So, Atelopus zeteki and Bufo viridis are not in the same genus.
Bufo bufo is in the genus Bufo. The first word of its scien... |
train/834 | What is the name of the colony shown? | [
"Delaware",
"Georgia",
"Maryland",
"New Hampshire"
] | 2 | closed choice | grade7 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Maryland. | ||
train/835 | What is the capital of Vermont? | [
"Huntington",
"Burlington",
"Montpelier",
"Boston"
] | 2 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Northeast | Montpelier is the capital of Vermont. | ||
train/836 | 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."
] | 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 | grade8 | 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 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1. |
train/837 | 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 greater in Pair 1.",
"The magnitude of the magnetic force is greater in Pair 2.",
"The magnitude of the magnetic force is the same in both pairs."
] | 0 | 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 sizes and shapes. | closed choice | grade8 | 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,... | Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them.
Magnet A is the same size in both pairs. But Magnet B is larger in Pair 1 than in Pair 2. So, the magnitud... |
train/838 | Select the chemical formula for this molecule. | [
"HCl",
"HClN",
"HC",
"H2Cl"
] | 0 | closed choice | grade5 | natural science | chemistry | Atoms and molecules | Match chemical formulas to 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 ... | H is the symbol for hydrogen. Cl is the symbol for chlorine. This ball-and-stick model shows a molecule with one hydrogen atom and one chlorine atom.
The chemical formula will contain the symbols H and Cl. There is one hydrogen atom, so H will not have a subscript. There is one chlorine atom, so Cl will not have a subs... | |
train/839 | What can Colin and Hanson trade to each get what they want? | [
"Hanson can trade his almonds for Colin's tomatoes.",
"Colin can trade his tomatoes for Hanson's carrots.",
"Colin can trade his tomatoes for Hanson's broccoli.",
"Hanson can trade his broccoli for Colin's oranges."
] | 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.
Colin and Hanson open their lunch boxes in the school cafeteria. Neither Colin nor Hanson got everything that they wanted. The ta... | closed choice | grade7 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Colin wants broccoli. Hanson 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. | |
train/840 | Which continent is highlighted? | [
"Antarctica",
"Asia",
"Africa",
"North America"
] | 0 | closed choice | grade8 | 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 Antarctica. | |
train/841 | What is the capital of Colorado? | [
"Helena",
"Denver",
"Colorado Springs",
"Kansas City"
] | 1 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Denver is the capital of Colorado. | ||
train/842 | Which of the following was a dependent variable in this experiment? | [
"the amount of lemon juice added to the apple slices",
"the number of apple slices that turned brown"
] | 1 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Leon's daughter complained that the in her lunchbox turned brown by lunchtime. Leon read that when are exposed to air, oxygen in the air reacts with the cut surface of the , turning them brown. Leon's favori... | closed choice | grade7 | 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... | |
train/843 | Which i in row A? | [
"the fire department",
"the grocery store",
"the police department",
"the library"
] | 0 | closed choice | grade3 | social science | geography | Geography | Use a letter-number grid | A grid is made up of lines of squares. They are organized in rows and columns. A grid can help you use a map.
A row is a line of squares that goes from side to side. Rows are marked with letters.
A column is a line of squares that goes up and down. Columns are marked with numbers. | The fire department is in row A. | |
train/844 | Which continent is highlighted? | [
"Europe",
"South America",
"Antarctica",
"Australia"
] | 0 | closed choice | grade4 | social science | geography | Oceans and continents | Identify 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. | |
train/845 | Which better describes the Pisgah National Forest ecosystem? | [
"It has soil that is rich in nutrients. It also has only a few types of trees.",
"It has warm, dry summers. It also has many different types of trees."
] | 0 | Figure: Pisgah National Forest.
The Pisgah National Forest is a temperate deciduous forest ecosystem in western North Carolina. | 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 temperate deciduous forest is a type of ecosystem. Temperate deciduous forests have the following features: warm, wet summers and cold, wet winters, soil that is rich in nutrients, and only a few types of trees. So, the Pisgah National Forest has soil that is rich in nutrients. It also has only a few types of trees. |
train/846 | Based on the time line, which book was published later? | [
"The Horse and His Boy",
"The Silver Chair"
] | 0 | This time line shows the publication dates of the books in The Chronicles of Narnia by C. S. Lewis. | closed choice | grade6 | language science | writing-strategies | Visual elements | Read graphic organizers | A graphic organizer is a chart or picture that shows how ideas, facts, or topics are related to one another.
When you read, look for graphic organizers included in the text. You can use these images to find key information. You can also create your own graphic organizers with information that you've read. Doing this ca... | A time line shows the order of events by placing them along a line. This time line shows the publication dates of the books in The Chronicles of Narnia by C. S. Lewis.
Look at how the events are ordered on the time line. Books that were published earlier are shown to the left. Books that were published later are shown ... |
train/847 | What is the name of the colony shown? | [
"Rhode Island",
"Ohio",
"Connecticut",
"Maine"
] | 2 | closed choice | grade5 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is Connecticut. | ||
train/848 | Which country is highlighted? | [
"Saint Kitts and Nevis",
"Saint Lucia",
"Grenada",
"Antigua and Barbuda"
] | 0 | closed choice | grade7 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Saint Kitts and Nevis. | ||
train/849 | Select the chemical formula for this molecule. | [
"NH3",
"NH",
"H",
"H3"
] | 0 | closed choice | grade5 | natural science | chemistry | Atoms and molecules | Match chemical formulas to 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 ... | N is the symbol for nitrogen. H is the symbol for hydrogen. This ball-and-stick model shows a molecule with one nitrogen atom and three hydrogen atoms.
The chemical formula will contain the symbols N and H. There is one nitrogen atom, so N will not have a subscript. There are three hydrogen atoms, so H will have a subs... | |
train/850 | What is the capital of Vermont? | [
"Burlington",
"Buffalo",
"Topeka",
"Montpelier"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Northeast | Montpelier is the capital of Vermont. | ||
train/851 | What is the capital of Nevada? | [
"Reno",
"Sacramento",
"Carson City",
"Las Vegas"
] | 2 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Carson City is the capital of Nevada. | ||
train/852 | During this time, thermal energy was transferred from () to (). | [
"each cake . . . the surroundings",
"the surroundings . . . each cake"
] | 0 | Jason baked two identical cakes. When he took them out of the oven, he left one cake in its pan and took the other cake out of its pan to put it on a plate. This table shows how the temperature of each cake changed over 5minutes. | closed choice | grade8 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, th... | The temperature of each cake decreased, which means that the thermal energy of each cake decreased. So, thermal energy was transferred from each cake to the surroundings. |
train/853 | Which solution has a higher concentration of green particles? | [
"Solution B",
"Solution A",
"neither; their concentrations are the same"
] | 0 | The diagram below is a model of two solutions. Each green ball represents one particle of solute. | closed choice | grade6 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container.
Use the concentration formula to find the number of green particles per millilit... |
train/854 | Is the following statement about our solar system true or false?
50% of the planets are made mainly of gas. | [
"true",
"false"
] | 1 | Use the data to answer the question below. | true-or false | grade6 | natural science | earth-science | Astronomy | Analyze data to compare properties of planets | A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice. | The table tells you that two out of the eight planets are made mainly of gas. So, one-fourth, or 25%, of the planets are made mainly of gas. |
train/855 | What is the name of the colony shown? | [
"New Hampshire",
"Kentucky",
"Vermont",
"Wisconsin"
] | 0 | closed choice | grade7 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is New Hampshire.
During the colonial era, New Hampshire and New York both claimed the territory that would later become the state of Vermont. Vermont was never its own colony. | ||
train/856 | What is the probability that a chicken produced by this cross will be heterozygous for the leg color gene? | [
"1/4",
"3/4",
"4/4",
"0/4",
"2/4"
] | 4 | In a group of chickens, some individuals have white legs and others have yellow legs. In this group, the gene for the leg color trait has two alleles. The allele for yellow legs (l) is recessive to the allele for white legs (L).
This Punnett square shows a cross between two chickens. | 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... | |
train/857 | What is the capital of Utah? | [
"Salt Lake City",
"Salem",
"Carson City",
"Sacramento"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the West | Salt Lake City is the capital of Utah. | ||
train/858 | Which rhetorical appeal is primarily used in this ad? | [
"logos (reason)",
"pathos (emotion)",
"ethos (character)"
] | 2 | closed choice | grade12 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals.
Appeals to ethos, or character, show the writer or speaker as trustworthy, authoritative, or sharing important values with the audience. An ad that appe... | The ad appeals to ethos, or character, by emphasizing that highly respected companies trust Novanoid's cloud computing service. | |
train/859 | Which of these states is farthest east? | [
"Montana",
"Wisconsin",
"Nebraska",
"Utah"
] | 1 | closed choice | grade3 | social science | geography | Geography | 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 east arrow is pointing. Wisconsin is farthest east. | |
train/860 | Which statement is true about the average monthly temperature in New York City? | [
"November is warmer than May.",
"January and February are the coldest months of the year.",
"July, August, and September are colder than the other months of the year."
] | 1 | Use the graph to answer the question below. | closed choice | grade4 | natural science | earth-science | Weather and climate | Use climate data to make predictions | Scientists record climate data from places around the world. Temperature is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average temperature for each month. The average temperature can be used to describe the climate of a location.
A line graph can be used t... | To describe the average temperature trends in New York City, look at the graph.
Choice "Feb" is incorrect.
Choice "May" is incorrect.
Choice "Jul" is incorrect.
Choice "Aug" is incorrect.
Choice "Sep" is incorrect.
Choice "Nov" is incorrect.
Choice "Jan" is incorrect.
Choice "January and February are the coldest months... |
train/861 | Does this passage describe the weather or the climate? | [
"climate",
"weather"
] | 1 | Figure: Afghanistan.
Afghanistan is a mountainous country. The temperatures were well below freezing for 15 of the 31 days in January.
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.
Afghanistan is a mountainous country. The temperatures were well below freezing for 15 of the 31 days in January.
The underlined part of the passage tells you about the temperatures measured during January in Afghanistan. This passage describes the atmosphere at a certain place and time. So,... |
train/862 | What is the expected ratio of offspring with white wool to offspring with black wool? Choose the most likely ratio. | [
"4:0",
"3:1",
"1:3",
"2:2",
"0:4"
] | 0 | In a group of sheep, some individuals have white wool and others have black wool. In this group, the gene for the wool color trait has two alleles. The allele for black wool (l) is recessive to the allele for white wool (L).
This Punnett square shows a cross between two sheep. | 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 white wool or black wool, consider whether each phenotype is the dominant or recessive allele's version of the wool color trait. The question tells you that the l allele, which is for black wool, is recessive to the L allele, which is for white ... |
train/863 | Which of the following could Myra and Jenna's test show? | [
"if a new batch of concrete was firm enough to use",
"if the concrete from each batch took the same amount of time to dry"
] | 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 | grade6 | 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... | |
train/864 | Which property do these three objects have in common? | [
"yellow",
"flexible",
"shiny"
] | 2 | Select the best answer. | closed choice | grade4 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
A shiny object reflects a lot of light. You can usually see your reflection in a shiny object. All three objects are shiny.
A flexible object can be folded or bent without breaking easily. The shield and the sapphire are not flexible.
Yellow is a col... |
train/865 | Which property do these three objects have in common? | [
"rough",
"colorful",
"transparent"
] | 1 | Select the best answer. | closed choice | grade4 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
A rough object feels scratchy when you touch it. The crayons and the parachute are not rough.
You can see clearly through a transparent object. None of the objects are transparent.
A colorful object has one or more bright colors. All three objects ar... |
train/866 | Select the organism in the same species as the lion's mane jellyfish. | [
"Aurelia aurita",
"Cyanea capillata",
"Aequorea victoria"
] | 1 | This organism is a lion's mane jellyfish. Its scientific name is Cyanea capillata. | closed choice | grade4 | 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 lion's mane jellyfish's scientific name is Cyanea capillata.
Aurelia aurita does not have the same scientific name as a lion's mane jellyfish. So, Cyanea capillata and Aurelia aurita are not in the same species.
Aequorea victoria does not have the same scientific name as a lion's mane jellyfish. So, Cyanea capillata ... |
train/867 | What is the probability that a dachshund dog produced by this cross will be homozygous dominant for the fur texture gene? | [
"1/4",
"4/4",
"3/4",
"0/4",
"2/4"
] | 3 | In a group of dachshund dogs, some individuals have rough fur and others have soft fur. In this group, the gene for the fur texture trait has two alleles. The allele for rough fur (F) is dominant over the allele for soft fur (f).
This Punnett square shows a cross between two dachshund dogs. | 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... | |
train/868 | Which of the following could Pedro's test show? | [
"how long it would take the sample fabric to dry after it absorbed one drop of water",
"if the sample fabric would absorb one drop of water in less than one second",
"how much athletes would sweat in the fabric"
] | 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... | |
train/869 | Which better describes the Eastern Siberian Taiga ecosystem? | [
"It has short, cool summers. It also has soil that is rich in nutrients.",
"It has long, cold winters. It also has soil that is poor in nutrients."
] | 1 | Figure: East Siberian Taiga.
The Eastern Siberian Taiga is a taiga ecosystem in Russia. | closed choice | grade4 | 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 taiga is a type of ecosystem. Taigas have the following features: long, cold winters and short, cool summers, many evergreen trees, and soil that is poor in nutrients. So, the Eastern Siberian Taiga has long, cold winters. It also has soil that is poor in nutrients. |
train/870 | 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 greater in Pair 2.",
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is greater in Pair 1."
] | 0 | 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 | grade5 | natural science | physics | Magnets | 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 smaller distance between magnets, the magnitude of the magnetic force between them is greater.
There is a smaller distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1. |
train/871 | Which country is highlighted? | [
"Tuvalu",
"Kiribati",
"the Marshall Islands",
"Australia"
] | 1 | closed choice | grade6 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Kiribati. | ||
train/872 | What can Alexa and Jason trade to each get what they want? | [
"Jason can trade his almonds for Alexa's tomatoes.",
"Alexa can trade her tomatoes for Jason's sandwich.",
"Alexa can trade her tomatoes for Jason's broccoli.",
"Jason can trade his broccoli for Alexa's oranges."
] | 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.
Alexa and Jason open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Alexa wanted br... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Alexa wanted broccoli in her lunch and Jason was hoping for tomatoes. Look at the labeled part of the images.
Alexa has tomatoes. Jason 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. | |
train/873 | Which animal's mouth is also adapted for gnawing? | [
"silky anteater",
"brown rat"
] | 1 | Marmots eat plant matter, such as leaves, stems, and seeds. They eat by biting off small pieces at a time, or gnawing. The 's mouth is adapted for gnawing.
Figure: marmot. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear ... | Look at the picture of the marmot.
The marmot has large front teeth. Its mouth is adapted for gnawing. The large front teeth can help the marmot break off pieces of food that it can swallow.
Now look at each animal. Figure out which animal has a similar adaptation.
The brown rat has large front teeth. Its mouth is adap... |
train/874 | Which country is highlighted? | [
"Saint Vincent and the Grenadines",
"Jamaica",
"Trinidad and Tobago",
"Grenada"
] | 3 | closed choice | grade8 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Grenada. | ||
train/875 | Based on the arrows, which of the following living things is a consumer? | [
"sea cucumber",
"kelp"
] | 0 | Below is a food web from an ocean ecosystem. The ecosystem is in Monterey Bay, off the coast of California.
A food web is a model that shows how the matter eaten by living things moves through an ecosystem. The arrows show how matter moves through the food web. | closed choice | grade3 | natural science | biology | Ecosystems | Interpret food webs | A food web is a model.
Models can make things in nature easier to understand. Models can be simpler than the things they represent. A food web is a model that shows where living things in an ecosystem get their food. If a food web showed every living thing in an ecosystem, the food web would be hard to understand. So, ... | Consumers eat other living things. So, there are arrows in a food web that point from other living things to consumers.
The sea cucumber has an arrow pointing to it from the plainfin midshipman. So, the sea cucumber is a consumer.
The kelp does not have any arrows pointing to it. So, the kelp is a producer, not a consu... |
train/876 | During this time, thermal energy was transferred from () to (). | [
"each battery . . . the surroundings",
"the surroundings . . . each battery"
] | 0 | Two friends bought phones that cost different amounts but had identical batteries. After using the phones for a while, both friends had to turn them off to let the batteries cool. This table shows how the temperature of each battery changed over 5minutes. | closed choice | grade8 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, th... | The temperature of each battery decreased, which means that the thermal energy of each battery decreased. So, thermal energy was transferred from each battery to the surroundings. |
train/877 | Which country is highlighted? | [
"Cuba",
"Haiti",
"The Bahamas",
"Saint Kitts and Nevis"
] | 1 | closed choice | grade7 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Haiti.
Does Haiti have any territorial disputes?
Haiti claims to own Navassa Island, which is a disputed territory. In other words, multiple countries or groups claim that the area rightfully belongs to them.
Navassa Island is also claimed by the United States. The United States claimed the island in 18... | ||
train/878 | Complete the text to describe the diagram.
Solute particles moved in both directions across the permeable membrane. But more solute particles moved across the membrane (). When there was an equal concentration on both sides, the particles reached equilibrium. | [
"to the right than to the left",
"to the left than to the right"
] | 0 | The diagram below shows a solution with one solute. Each solute particle is represented by a green ball. The solution fills a closed container that is divided in half by a membrane. The membrane, represented by a dotted line, is permeable to the solute particles.
The diagram shows how the solution can change over time ... | closed choice | grade6 | natural science | chemistry | Solutions | Diffusion across membranes | In a solution, solute particles move and spread throughout the solvent. The diagram below shows how a solution can change over time. Solute particles move from the area where they are at a higher concentration to the area where they are at a lower concentration. This movement happens through the process of diffusion.
A... | Look at the diagram again. It shows you how the solution changed during the process of diffusion.
Before the solute particles reached equilibrium, there were 8 solute particles on the left side of the membrane and 2 solute particles on the right side of the membrane.
When the solute particles reached equilibrium, there... |
train/879 | 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 greater in Pair 1.",
"The magnitude of the magnetic force is greater 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 | grade8 | 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,... | The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force.
Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are... |
train/880 | Which animal's mouth is also adapted for gnawing? | [
"nutria",
"raccoon"
] | 0 | s spend most of their life underground. They feed on plant roots and bulbs. Mole rats eat by biting off small pieces at a time, or gnawing. The mole rat's mouth is adapted for gnawing.
Figure: Podolsk mole rat. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear ... | Look at the picture of the Podolsk mole rat.
The Podolsk mole rat has large front teeth. Its mouth is adapted for gnawing. The large front teeth can help the Podolsk mole rat break off pieces of food that it can swallow.
Now look at each animal. Figure out which animal has a similar adaptation.
The nutria has large fro... |
train/881 | Which animal's feet are also adapted for swimming? | [
"European beaver",
"African crowned eagle"
] | 0 | Red-eared sliders are a type of turtle. They are found in ponds, lakes, and rivers in many parts of North America. The feet of the are adapted for swimming.
Figure: red-eared slider. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: feet and limbs | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur m... | Look at the picture of the red-eared slider.
The red-eared slider has webbed feet. Its feet are adapted for swimming. As it swims, the red-eared slider uses its webbed feet to push itself through water.
Now look at each animal. Figure out which animal has a similar adaptation.
The European beaver has webbed feet. Its f... |
train/882 | Which of the following could Rosa's test show? | [
"if the new turbine could turn easily",
"how much the new turbine would weigh",
"whether the new turbine could produce 10% more electricity"
] | 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... | |
train/883 | Is the following statement about our solar system true or false?
Jupiter's volume is more than 1,000 times that of Earth. | [
"false",
"true"
] | 1 | Use the data to answer the question below. | true-or false | grade8 | natural science | earth-science | Astronomy | Analyze data to compare properties of planets | A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.
The volume of a planet is a very large quantity. Large quantities such as this are often written in scientific notation.
For ex... | To determine if this statement is true, calculate the value of 1,000 times the volume of Earth.
Then compare the result to the volume of Jupiter. The volume of Jupiter is 1.43 x 10^15 km^3, which is more than 1.08 x 10^15 km^3. So, Jupiter's volume is more than 1,000 times that of Earth. |
train/884 | 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 ... |
train/885 | Identify the question that Linda's experiment can best answer. | [
"Does the amount of water in a glass affect whether eggs sink or float in the water?",
"Are eggs more likely to float in fresh water or salty water?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Linda poured four ounces of water into each of six glasses. Linda dissolved one tablespoon of salt in each of three glasses, and did not add salt to the other three. Then, Linda placed an egg in one glass and observed i... | closed choice | grade7 | 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... | |
train/886 | Which statement describes the Buffalo Gap National Grassland ecosystem? | [
"It has hot summers and cool winters.",
"It has heavy rain.",
"It has soil that is poor in nutrients."
] | 0 | Figure: Buffalo Gap National Grassland.
Buffalo Gap National Grassland is a prairie grassland ecosystem in southwestern South Dakota. It is home to the endangered black-footed ferret. This is the only kind of ferret that is native to North America. | closed choice | grade8 | 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 prairie grassland is a type of ecosystem. Prairie grasslands have the following features: hot summers and cool winters, a medium amount of rain, and soil that is rich in nutrients. So, the following statement describes the Buffalo Gap National Grassland ecosystem: hot summers and cool winters, a medium amount of rain... |
train/887 | Which ocean is highlighted? | [
"the Indian Ocean",
"the Pacific Ocean",
"the Arctic Ocean",
"the Southern Ocean"
] | 2 | closed choice | grade7 | 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 Arctic Ocean. | |
train/888 | 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 2.",
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is smaller 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 | 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,... | The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force.
Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magni... |
train/889 | 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"
] | 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 | grade7 | 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 B has more mass than each particle in sample A. The particles in sample B also have a higher average speed than the particles in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A.
Because the particles in sample B have the higher average ... |
train/890 | What is the capital of Colorado? | [
"Colorado Springs",
"Boulder",
"Denver",
"Cheyenne"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify the 50 state capitals | Denver is the capital of Colorado. | ||
train/891 | 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 greater in Pair 2.",
"The magnitude of the magnetic force is greater in Pair 1."
] | 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 smaller distance between magnets, the magnitude of the magnetic force between them is greater.
There is a smaller distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1. |
train/892 | Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 0 | Two magnets are placed as shown.
Hint: Magnets that attract pull together. Magnets that repel push apart. | closed choice | grade3 | 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 south pole of one magnet is closest to the south pole of the other magnet. Poles that are the same repel. So, these magnets will repel each other. |
train/893 | Which rhetorical appeal is primarily used in this ad? | [
"ethos (character)",
"pathos (emotion)",
"logos (reason)"
] | 2 | closed choice | grade12 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals.
Appeals to ethos, or character, show the writer or speaker as trustworthy, authoritative, or sharing important values with the audience. An ad that appe... | The ad appeals to logos, or reason, by using a graph to show that Silcom outperforms the competition. | |
train/894 | Which country is highlighted? | [
"Nauru",
"Solomon Islands",
"Fiji",
"Vanuatu"
] | 3 | closed choice | grade8 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Vanuatu.
Does Vanuatu have any territorial disputes?
Vanuatu claims to own Matthew and Hunter Islands, which are disputed islands. In other words, multiple countries or groups claim that the islands rightfully belong to them.
France has controlled the islands since 1929. But shortly after gaining indepe... | ||
train/895 | Which specific humidity level was measured within the outlined area shown? | [
"12 grams of water vapor per kilogram of air",
"7 grams of water vapor per kilogram of air",
"11 grams of water vapor per kilogram of air"
] | 1 | The map below shows humidity in the lower atmosphere on September 12, 2013. The map shows specific humidity, a measurement of the amount of water vapor in the air. The outlined area shows an air mass that influenced weather in Australia on that day.
Look at the map. Then, answer the question below.
Data source: United ... | closed choice | grade8 | natural science | earth-science | Weather and climate | Identify and compare air masses | To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show specific humidity, a measurement of the amount of water vapor in the air.
The map's legend tells you the specific humidity level that each color represents. Colors on the left in th... | Look at the colors shown within the outlined area. Then, use the legend to determine which specific humidity levels those colors represent.
The legend tells you that this air mass contained air with specific humidity levels between 2 and 8 grams of water vapor per kilogram of air.
7 grams of water vapor per kilogram of... |
train/896 | Which country is highlighted? | [
"the Dominican Republic",
"Saint Kitts and Nevis",
"Jamaica",
"Haiti"
] | 2 | closed choice | grade6 | social science | geography | The Americas: geography | Identify and select countries of the Caribbean | This country is Jamaica. | ||
train/897 | Identify the question that Kayla's experiment can best answer. | [
"Does the humidity level where tomato seeds are planted affect the number of tomato seedlings that grow?",
"Do more tomato seedlings grow when they are planted in soil with fertilizer compared to soil without fertilizer?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Kayla planted 25 tomato seeds one-half inch below the soil surface in each of six pots. Kayla added an equal amount of fertilizer to three of the six pots. She placed the pots in a plant growth chamber where all the see... | 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... | |
train/898 | Which material is this flower pot made of? | [
"rock",
"clay"
] | 1 | closed choice | grade3 | 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 flower pot.
The flower pot is made of clay.
This flower pot is made of a type of clay called terra cotta. Terra cotta pots have a brownish-red color. Terra cotta means "baked earth" in Italian. | |
train/899 | What is the expected ratio of offspring with a greenish-brown body to offspring with a blue body? Choose the most likely ratio. | [
"1:3",
"4:0",
"3:1",
"2:2",
"0:4"
] | 4 | In a group of rainbow trout, some individuals have a greenish-brown body and others have a blue body. In this group, the gene for the body color trait has two alleles. The allele for a greenish-brown body (B) is dominant over the allele for a blue body (b).
This Punnett square shows a cross between two rainbow trout. | 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 a greenish-brown body or a blue body, consider whether each phenotype is the dominant or recessive allele's version of the body color trait. The question tells you that the B allele, which is for a greenish-brown body, is dominant over the b all... |
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