7th Grade Science : Physical Science

Study concepts, example questions & explanations for 7th Grade Science

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Example Questions

Example Question #1 : Physical Science

What point on the image provided represents a wavelength? 

2

Possible Answers:

C

B

D

A

Correct answer:

A

Explanation:

A wavelength is the length of a complete wave cycle, from one crest to the next crest or one trough to the next trough. 

Point A is the length from one crest to the next crest; thus, point A represents a wavelength. 

Example Question #2 : Physical Science

What point on the image provided represents a crest? 

2

Possible Answers:

C

D

B

A

Correct answer:

C

Explanation:

The crest of a wave is the upper most point that a wave rises up. Point C is at the upper most point of a wave. 

Example Question #3 : Physical Science

What point on the image provided represents a trough? 

2

Possible Answers:

A

B

D

C

Correct answer:

B

Explanation:

The trough of a wave is the lowest most point that a wave falls downward. Point B is at the lowest most point of a wave. 

Example Question #4 : Physical Science

What point on the image provided represents an amplitude? 

2

Possible Answers:

D

C

A

B

Correct answer:

D

Explanation:

The amplitude is the distance from rest to a crest or from rest to a trough. Point D represents the distance from rest to the trough; thus, point D is the correct answer. 

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