Physical Science Review Standards

Jason stretches a rubber band between his fingers as shown in the diagram. When he plucks the rubber band, it makes a sound. Which of the following best explains why the rubber band makes a sound when Jason plucks it?

• It heats the air.

• It vibrates the air.

• It absorbs energy from the air.

• It releases molecules into the air.

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Erica tightens a string on her guitar. Why does tightening the strong make it produce a higher pitched sound?

• The strong vibrates faster.

• The string vibrates slower.

• The string vibrates for a longer time.

• The string vibrates for a shorter time.

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Olivia is combing her hair. After a while, she notices that the comb attracts the hairs on her head as shown. Which explanation BEST describes why the hairs are attracted to the comb.

• Combing the hairs caused them to lose their static charge.

• Combing the hairs caused the comb to lose its static charge.

• Combing the hairs gave them a charge that is opposite the charge on the comb.

• Combing the hairs gave them a charge that is the same as the charge on the comb.

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Ariana uses balloons to investigate static electricity. Which of the following BEST explains what will happen when she brings two positively charged balloons close to each other? 

• The balloons will move apart.

• One balloon will lose its charge.

• The balloons will come together.

• One balloon will gain a negative charge.

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One morning, Ryan noticed there were tiny drops of water on the grass as he walked to school. That

afternoon, he did not see any drops of water on the grass when he returned home. Which of the

following best explains what happened to the drops of water?

• The heat from the air caused the water drops to boil.

• The air cooled the water and caused the drops to freeze.

• The Sun heated the water and caused the drops to evaporate.

• The energy from the Sun caused the water drops to condense.

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One morning, Ryan noticed there were tiny drops of water on the grass as he walked to school. That

afternoon, he did not see any drops of water on the grass when he returned home. Which of the

following best explains what happened to the drops of water?

• The heat from the air caused the water drops to boil.

• The air cooled the water and caused the drops to freeze.

• The Sun heated the water and caused the drops to evaporate.

• The energy from the Sun caused the water drops to condense.

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The ripening of an apple is an example of a chemical change. In order to investigate this process, Jennifer places one at room temperature and one in the refrigerator. After ten days Jennifer checks the ripeness of each apple. Which statement best explains the expected results?

• The apple at room temperature will ripen more slowly because higher temperatures increase the rate of chemical reactions.

• The apple at room temperature will ripen more slowly because higher temperatures decrease the rate of chemical reactions.

• The apple at room temperature will ripen more quickly because higher temperatures increase the rate of chemical reactions.

• The apple at room temperature will ripen more quickly because higher temperatures decrease the rate of chemical reactions.

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