Georgia Science Grade 8

Chapter 17: Sound

CRCT Practice

1
How can the pitch of the sound made by a guitar string be lowered?
A)by making the vibrating part of the string shorter
B)by tightening the string
C)by making the vibrating part of the string longer
D)by plucking the string harder
2
What part of the wave is shown at F?

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A)rarefaction
B)compression
C)wavelength
D)amplitude
3
What part of the wave is shown at H?

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A)rarefaction
B)compression
C)wavelength
D)amplitude
4
How are the overtone frequencies of any vibrating object related to the fundamental frequency of vibration?

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A)They are multiples of the fundamental.
B)They are not related to the fundamental.
C)They are equal to twice the fundamental.
D)They are lower than the fundamental.
5
Which is the frequency of the third overtone?

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A)1,572 Hz
B)1,000 Hz
C)1,048 Hz
D)786 Hz
6
If you were on a moving train, what would happen to the pitch of a bell at a crossing as you approached and then passed by the crossing?
A)It would seem higher, then lower.
B)It would remain the same.
C)It would seem lower, then higher.
D)It would keep getting lower.
7
Which is NOT related to the amplitude of a sound wave?
A)energy carried by a sound wave
B)loudness of a sound
C)pitch of a sound
D)how spread out the particles are in the compressions and rarefactions
8
What happens to the particles in matter when a compressional wave moves through the matter?
A)The particles do not move.
B)The particles move back and forth along the direction in which the wave travels.
C)The particles move back and forth and are carried along with the wave.
D)The particles move in a direction perpendicular to the direction the wave travels.
9
Suppose you are at a baseball game 150 m from home plate. How long after the batter hits the ball do you hear the sound?

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A)0.10 s
B)0.025 s
C)0.44 s
D)2.29 s
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