Show:
Changes in Matter
Scientific Knowledge
Changes in Motion
Forms of Energy
Properties of Matter
100
4) Which answer describes a way that a liquid can be turned into a gas? A. Apply enough heat to cause evaporation. B. Apply freezing temperatures to cause condensation. C. Lower the temperature of the container to allow vaporization. D. Maintain a constant temperature over a long enough time to cause freezing.
What is A. Apply enough heat to cause evaporation.
100
1) Dr. Jones thinks she has just discovered a new plant species. How should she best communicate her findings with other scientists? A. Try to find another plant to discover. B. Post her discovery on the internet as fact. C. Publish her discovery for other scientists to test. D. Call her friends and tell them about the discovery.
What is C. Publish her discovery for other scientists to test.
100
4) Because the force of gravity is so strong, it appears to attract all objects equally, regardless of mass. Which of the following is illustrated by this idea? A. Earth orbits the Sun in the same amount of time it takes the Moon to orbit Earth. B. A rubber ball will bounce much higher than a wooden ball, even if they weigh the same. C. Magnets can both repel and attract each other, depending on how they come into contact. D. A bowling ball and a peanut will fall to the ground at the same rate when someone drops them.
What is D. A bowling ball and a peanut will fall to the ground at the same rate when someone drops them.
100
1) During a storm, the power goes out at Randall's house. His mother strikes a match to light a candle. As the match burns, it gives off light energy. What other form of energy does the burning match give off? A. chemical B. electrical C. mechanical D. thermal
What is D. thermal
100
3) Susan blew up a balloon until it was completely full and as big as a soccer ball. Which of the following correctly describes the air inside the balloon? A. The air is a gas that cannot be compressed by any means. B. The air is a gas that always forms a round shape when compressed. C. The air is a gas that expands to evenly fill the space inside the balloon. D. The air is a gas that will flow evenly and steadily from inside the balloon if punctured.
What is C. The air is a gas that expands to evenly fill the space inside the balloon.
200
1) On a sunny day, Elena is cutting branches from a tree in her yard. At midday, she takes a break, leaving a pile of branches and leaves on the ground. When she returns and gathers the branches, she notices the leaves are wilted and crisp. Which of the following correctly describes what happened to the leaves? A. The trees had not received water for a long time before being cut. B. The warm temperature caused moisture to evaporate from the leaves. C. The nutrients cannot reach the leaves if the tree's branches are not upright. D. The leaves had been covered in frost the week before, but had not wilted until now.
What is B. The warm temperature caused moisture to evaporate from the leaves.
200
5) Many people take vitamin C when they feel they are catching a cold. In fact, some people seem to recover more quickly when they take C vitamins. What is the main problem with concluding vitamin C helps you fight off a cold based on this information? A. We cannot know exactly how vitamin C works. B. We cannot keep track of how much vitamin C people take. C. We cannot know how long the cold would have lasted without the vitamin C. D. We cannot know what other changes in diet people may have made while sick.
What is C. We cannot know how long the cold would have lasted without the vitamin C.
200
5) Which of the following explains why a parachute makes a person falling from a great height fall more slowly? A. The parachute reduces the friction in the air. B. The parachute pulls upward, so the fall is slower. C. The parachute causes air resistance, which slows the fall. D. The parachute decreases the pull of gravity on the person wearing it.
What is C. The parachute causes air resistance, which slows the fall.
200
2) Vincent's father is preparing noodles for dinner. He puts a pot of water on the electric stove to cook the noodles in. When the water starts to boil, he adds the noodles to the pot. What form of energy causes the noodles to cook on the range? A. chemical B. heat C. light D. mechanical
What is B. heat
200
2) The two objects shown are the same size. However, one object is made of wood, and the other object is made of plastic. Which of the following properties of the objects will be the same? A. mass B. texture C. volume D. weight
What is C. volume
300
3) Which of the following describes an example of a material undergoing a chemical change to become another material with different characteristics? A. Iron turns to rust when it is exposed to oxygen. B. When water boils, it turns into vapor, which is a gas. C. Oxygen can become liquid at a very low temperature. D. Gold can be spread out very thin to cover a large area.
What is A. Iron turns to rust when it is exposed to oxygen.
300
3) Ximena is an expert at blowing bubbles with bubble gum. She discovered that her bubbles were bigger if she stood facing the Sun when she blew them. At lunch she told her three best friends about her discovery and after school they all tried it. No one else was able to blow bigger bubbles when they faced toward the Sun. Which of the following would be best for Ximena to do next? A. She should give them each bigger pieces of bubble gum and try it one more time. B. She should prove she is right by blowing bubbles while her friends are watching. C. She should ask her friends to try it again and concentrate harder when they face the Sun. D. She should think about what else she is doing that might have made the bubbles bigger.
What is D. She should think about what else she is doing that might have made the bubbles bigger.
300
2) Aaron is playing with a soccer ball at the top of a hill. Aaron kicks the ball and it rolls down the hill. Which of the following best describes what happens as the ball rolls? A. The force of gravity pulls the ball downhill. B. The force of friction causes the ball to roll faster down the hill. C. The force of gravity is balanced by air resistance acting on the ball. D. The force of friction is greater than the force of gravity acting on the ball.
What is A. The force of gravity pulls the ball downhill.
300
3) Katie and her family are watching a fireworks display at an outdoor Fourth of July celebration. The fireworks store chemical energy, and when they are set off, they give off two forms of energy: light and which of the following? A. electrical B. mechanical C. solar D. sound
What is D. sound
300
1) Janice found two sea shells when she went to the beach. They appear to be almost the same size, but they have different shapes. How could she figure out if their volume is the same? A. Weigh each one on a scale to see which is heaviest. B. Fill each one with water to see which will hold the most. C. Drop each one in a beaker of water to see which raises the water level the most. D. Measure the length of each one with a measuring tape to see which is longest.
What is C. Drop each one in a beaker of water to see which raises the water level the most.
400
2) Imagine that you fill a bucket to the top with water and then place the bucket outside in freezing weather. Which of the following describes what will happen when the water in the bucket freezes? A. The level of the water and the bucket itself will not be changed by becoming frozen. B. The level of the water will be lower once it is frozen and the molecules are more compact. C. The sides of the bucket will be pushed out and the level of the water will be above the rim of the bucket. D. The level of the water will be uneven once it is frozen because some of the water will remain as a liquid in the bucket.
What is C. The sides of the bucket will be pushed out and the level of the water will be above the rim of the bucket.
400
2) Maria and her brother like to go fishing at the lake on Saturdays. They wondered if fish were more likely to bite at one time of day than another. They decided to try an experiment the next two Saturdays. On the first Saturday, it was hot and sunny, and they went fishing in the morning. Maria and her brother caught a total of five fish. On the second Saturday, it was overcast and cool, and they went fishing in the afternoon. They only caught a total of three fish this time. Can they conclude that fish bite better in the morning? A. Yes. They caught more fish in the morning, so morning is a better time to fish. B. Yes. It is more likely to be sunny in the morning, and fish bite better when it is sunny. C. No. They will need to repeat their experiment several times, since the weather conditions and times were different both days. D. No. They only did their experiment on Saturdays, so they don't know if they would get the same results on other days.
What is C No. They will need to repeat their experiment several times, since the weather conditions and times were different both days.
400
3) While Carmen is at the park with her family, she walks up to a wishing well. She throws a penny down the well, and she hears a splash at the bottom. Which of the following best describes what happens as the penny falls? A. The force of gravity is equal to the air resistance acting on the penny. B. The magnetic force of the well attracts the penny and causes it to fall even faster. C. The force of friction acts against air resistance, causing the penny to fall even faster. D. The force of air resistance acts against gravity, but it is not enough to overcome gravity.
What is D. The force of air resistance acts against gravity, but it is not enough to overcome gravity.
400
4) Solar power is a technology that relies on a renewable energy resource. Solar power changes energy from the Sun into a form of energy that can be used to heat our homes and run household appliances. What form of energy must solar energy be changed into in order to run household appliances? A. chemical B. electrical C. light D. thermal
What is B. electrical
400
4) Dan brought some chocolate chips in a plastic container with his lunch one day. He decided to save them and eat them while he waited for the bus after school. All afternoon his lunch bag sat on the warm windowsill in his classroom. When he finally took the container out after school, the chocolate chips had turned into a hard chunk of chocolate shaped like the bottom of the container. What happened to his chocolate chips? A. They started as a solid, melted, and then became solid again. B. They changed from a solid to a gas before becoming solid once again. C. They were a cool solid to start, then became a warm solid before cooling again. D. They went from being a hard solid to a gas, a liquid, and then to a hard solid again.
What is A. They started as a solid, melted, and then became solid again.
500
5) Nadal is helping prepare a large meal for a family gathering. After cooking for several hours, he notices the windows inside the kitchen are covered in moisture. Which answer best explains how this happened? A. Evaporated moisture is condensing on the windows. B. Heating up the house will make moisture evaporate from the windows. C. It is raining outside and hot and dry inside, so water condenses inside the windows. D. Having many people in a house causes water to form condensation on the windows.
What is A. Evaporated moisture is condensing on the windows.
500
4) Jamal and Billy are testing paper airplanes to see which design makes a plane fly farther. Jamal's design has straight wings and Billy's has bent wings. They stood side by side and each threw their planes at the same time. They did this six times, measuring how far each plane went from the starting line in meters. They decided that Billy's design with bent wings travels farther. What should they do next to see if their results are valid? A. Have other friends try the same experiment. B. Have them throw planes in different locations. C. Have them throw with their eyes shut each time. D. Have Billy bend the wings up even more on his plane.
What is A. Have other friends try the same experiment.
500
1) Brian and Emily are testing different paper airplane designs to see which will allow a plane to go the farthest. Emily folds her plane and attaches a paperclip to the front of it. After she throws the plane, it travels about fifty feet and then starts to fall to the ground. Why does the plane eventually fall to the ground? A. The force of air resistance stops acting on the plane. B. The plane was not designed to carry a load like the paperclip. C. The force of gravity is greater than the forces keeping the plane in the air. D. The paperclip creates a magnetic force that attracts the plane to the ground.
What is C. The force of gravity is greater than the forces keeping the plane in the air.
500
5) In many electrical factories, fossil fuels are burned to boil water and generate steam. This steam is then used to help generate electricity. What type of energy is given off by the fossil fuels and used to boil the water? A. chemical energy B. heat energy C. light energy D. sound energy
What is B. heat energy
500
5) Jacob found a piece of a broken glass bottle. He picked it up and made these observations about it: 1. No color (clear) 2. Makes scratches on wood 3. Has a bumpy surface 4. Broke when I dropped it He thinks the glass is a solid and most of his observations could only apply to a solid. Which one of his observations could possibly apply to a solid, a liquid or a gas? A. 1 B. 2 C. 3 D. 4
What is A. 1