7th grade science IA Review

What is an echo?

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NGSS.MS-PS4-2

When we watch tv, the sound travels from the TV's speaker to our ear. Which of following describes the process?

• matter is transferred from the speaker to the person's ear.

• energy is transferred from the speaker to the person's ear.

• particles are transferred from the speaker to the ear

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Which type of waves must have a medium in order to travel?

• electromagnetic wave

• mechanical wave

Which type of wave does NOT require a medium to travel?

• electromagnetic wave

• mechanical wave

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How does light travel

• It curves around corners
• Really slow
• In a straight line
• In circles

Which material absorbs the most light

• Aluminum foil

• black towel

• clear glass

• white paper

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NGSS.MS-PS4-2

The above table shows an experiment where the number of light bulbs was changed in each circuit. All other components stayed the same.

Based only on the table, how would you describe the relationship of Voltage, resistance, and current?

• As resistance increases, voltage increases and current increases

• As resistance increases, voltage decreases and current decreases

• As resistance increases, voltage stays the same and current increases

• As resistance increases, voltage stays the same and current decreases

Mr. Jones has a light bulb and conductive wires. He wants to light up the light bulb, but he needs one more component. What is the item needed?

• Power Source

• Resistor or Load

• Conductive Wires

• A switch

Why can't sound travel through outer space?

• There is almost no matter in outer space, so the vibrations have no way to travel through the atmosphere. There is nothing to carry the sound waves through space.

• Sound actually travels very quickly through outer space because there is no matter to slow down the sound waves.

• There are too many planets and stars in outer space that absorb all of the sound waves, so they cannot travel to the human ear.

• Because outer space is a "vacuum," the vibrations are irregular and travel in too many directions for us to detect the sound.

When you place things into water they sometimes look bent (see the image below). What is this an example of?

• Refraction

• Diffraction

• Transmission

• Absorption

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NGSS.MS-PS4-2