HNB STUDY CIRCLE

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HNB STUDY CIRCLE

CHAPTER 13 SOUND

Question 1.The voice box is also called as

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(a) stomach

(b) heart

(d) mouth

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Question 2.Sound is a kind of

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(a) work

(b) energy

(d) pressure

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Question 3.The hearing range of human ear is

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(a) 20 Hz to 20,000 Hz

(b) less than 20 Hz

(d) 20 Hz to 25,000 Hz

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Question 4.Pitch of sound is determined by its

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(a) frequency

(b) speed

(d) loudness

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Question 5.The frequency of subsonic sound is

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(a) more than 20 Hz

(b) 100 Hz

(d) more than 20,000 Hz

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Question 6.Cochlea is a part of

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(a) hearing organ

(b) sound producing organ

(d) air pollution

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Question 7. 1 hertz is equal to

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(a) 1 vibration per minute

(b) 10 vibrations per minute

(d) 600 vibrations per minute

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Question 8.Sound cannot travel through

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(a) air

(b) water

(d) vacuum

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Question 9.The sound in the audible range is called

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(a) ultrasonic sound

(b) sonic sound

(d) light sound

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Question 10.Speed of sound in solids is....... the speed of sound in liquids.

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(a) same as

(b) greater than

(d) both (b) and (c)

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Question 11.A pendulum oscillates 20 times in 4 seconds. Find its time period.

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(a) 0.05 sec.

(b) 0.001 sec.

(d) 0.1 sec.

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Question 12.Loudness of sound is determined by

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(a) pitch

(b) frequency

(d) time period

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Question 13.The number of vibrations made by a vibrating body in one second is

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(a) frequency

(b) noise

(d) pitch

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Question 14.The maximum displacement of a body from its mean position is called

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(a) amplitude

(b) oscillation

(d) frequency

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Question 15.The velocity of sound at 20°C is approximately

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(a) 3400 m/sec.

(b) 340 m/sec.

(d) 304 m/sec.

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Question 16.Sound usually travels through which medium to reach our ears?

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(a) Air

(b) Water

(d) Asbestos

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Question 17.What is the speed of sound in air?

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(a) 110 m/s

(b) 220 m/s

(d) 440 m/s

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Question 18.What is the length of vocal cords in men?

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(a) 5 mm

(b) 10 mm

(d) 20 mm

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Question 19.What is the length of vocal cords in women?

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(a) 5 mm

(b) 10 mm

(d) 20 mm

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Question 20.A vibrating body should oscillate minimum how many times per second to make a sound audible for humans?

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(a) 10 times

(b) 20 times

(d) 40 times

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