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Chapter 13 - Sound - 1
1.
No sound is produced by striking a tuning fork on a rubber pad.
a) False
b) True
2.
A sound wave is composed of compression and a rarefaction.
a) True
b) False
3.
Bel is very large unit of intensity level.
a) True
b) False
4.
The distance between a node and antinode is half of the wavelength.
a) False
b) True
5.
Ear drum can vibrate with more than 20,000 Hz frequency.
a) False
b) True
6.
Material medium is necessary for the propagation of sound waves.
a) False
b) True
7.
By increasing amplitude of vibrating body, loudness of sound decreases.
a) True
b) False
8.
Value for intensity of rustle of leaves is 10
-11
w/m
2
a) False
b) True
9.
Intensity level of whispeirng is 20dB.
a) False
b) True
10.
Pitch does not depend on frequency of sound.
a) True
b) False
11.
The characteristics of sound by which two sounds of same loudness and pitch are distinguished from each other is called quality of sound.
a) False
b) True
12.
Audible frequency range is 20Hz to 20KHz.
a) True
b) False
13.
Kidney stone cannot be crushed with the help of ultrasonic waves.
a) False
b) True
14.
The distance between a node and next antinode is equal to one quarter of wavelength.
a) True
b) False
15.
Young children can hear sounds of 20,000Hz frequency.
a) False
b) True
16.
Intensity of ordinary conversation is
a) 10
-
W/m
2
b) 10
-12
W/m
2
c) 10
-4
W/m
2
d) 10
-6
W/m
2
17.
The places where molecules of the medium are very far from each other are called
a) crests
b) compressions
c) rarefaction
d) troughs
18.
Sound waves cannot travel through
a) air
b) water
c) vaccum
d) iron
19.
The horn like part of the ear which can be seen from outside is called.
a) outer ear
b) inner ear
c) eardrum
d) middle ear
20.
Characteristic of sound by which a loud and faint sound can be distinguised is called
a) quality
b) loudness
c) pitch
d) intensity
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