Physical Science Review

Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

• Magnetic force is a repellant force

• Magnetic forces act on wood, like in the table

• The paper clips are feeling the gravitational force of the magnet

• Magnetic forces act at a distance, even betwewn objects

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Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

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Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have opposite charges

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The highest point on a wave is:

• the crest

• the trough

• the top

• the coast 

Which wave in the diagram has the greatest wavelength?

• 1

• 2

• 3

• 4

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A blue dish appears blue because it

• absorbs blue light

• absorbs white light

• reflects white light

• reflects blue light

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___________ is a form of energy that we can see with our eyes.

• Radio Waves

• Visible Light

• Ultraviolet

• Reflection

What color is an object that absorbs all the colors in the light spectrum?

• A rainbow

• White

• Black

• Invisible

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A leaf is green. What does this tell you about the light that is being absorbed?

• The light is a UV ray.

• The light is not a part of the light spectrum.

• All colors are reflected except green.

• All colors are absorbed except green

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What happens when light hits a shiny or smooth surface?

• It disappears.

• It is refracted.

• It is absorbed.

• It is reflected.

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