Ques:Answer the following question given this paragraph: Why do charges flow in an electric current? The answer has to do with electric potential energy. Potential energy is stored energy that an object has due to its position or shape. An electric charge has potential energy because of its position in an electric field. For example, when two negative charges are close together, they have potential energy because they repel each other and have the potential to push apart. If the charges move apart, their potential energy decreases. Electric charges always move spontaneously from a position where they have higher potential energy to a position where their potential energy is lower. This is similar to water falling over a dam from an area of higher to lower potential energy due to gravity. Q: What is the scientific term for stored energy an object has due to its position or shape? Choices: - repeat energy - mechanical energy - new energy - potential energy A:

Ans:potential energy
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Ques:Answer the following question given this paragraph: Scientists create models with computers. Computers can handle enormous amounts of data. This can more accurately represent the real situation. For example, Earth's climate depends on an enormous number of factors. Climate models can predict how climate will change as certain gases are added to the atmosphere. To test how good a model is, scientists might start a test run at a time in the past. If the model can predict the present it is probably a good model. It is more likely to be accurate when predicting the future. Q: What technology do scientists use to create models? Choices: - calculators - patterns - microscopes - computers A:

Ans:computers
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Ques:Answer the following question given this paragraph: With less ozone in the stratosphere, more UV rays reach the ground. More UV rays increase skin cancer rates. Just a 1 percent loss of ozone causes a 5 percent increase in skin cancer. More UV rays also harm plants and phytoplankton. As a result, they produce less food. This may affect entire ecosystems. Q: More uv rays reach the ground due to a decrease in what layer in the stratosphere? Choices: - troposphere - smog - gases - ozone A:

Ans:ozone
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Ques:Answer the following question given this paragraph: Some of the most interesting evidence for evolution comes from vestigial structures . These are body parts that are no longer used but are still present in modern organisms. Examples in humans include tail bones and the appendix. Q: What is the tail bone an example of? Choices: - invertebrate structure - parasitic structure - primordial structure - vestigial structure A:

Ans:
vestigial structure
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