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?
D
C
B
A
A
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?
C
B
A
D
C
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?
B
D
A
C
B
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?
D
B
A
C
D
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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