light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 6 [IAS (Pre) 2003]

Which one of the following statements is not correct?

a) The velocity of sound in air is independent of pressure

b) The velocity of sound in air decreases as the humidity increases

c) The velocity of sound in air increases with the increase of temperature

d) The velocity of sound in air is not affected by the change in amplitude and frequency

Answer: (b)

Question : 7 [UPPCS (Pre) 2013]

Sound above what level (in decibel) is considered hazardous noise pollution?

a) 100 dB

b) 80 dB

c) 30 dB

d) 120 dB

Answer: (b)

Question : 8 IAS (Pre) 2009]

Waves used for telecommunication are

a) Ultraviolet

b) Infrared

c) Visible light

d) Microwave

Answer: (d)

Question : 9

If you are at open-air concert and someone’s head gets between you and the orchestra, you can still hear the orchestra because

a) the sound is reflected from the head

b) sound waves pass easily through a head

c) a head is not very large compared with the wavelength of the sound

d) the wavelength of the sound is much smaller than the head

Answer: (c)

Question : 10

Range of audio-frequencies is

a) 103 – 105 Hz

b) 1 –15 Hz

c) 20 – 20, 000 Hz

d) 106 – 108 Hz

Answer: (c)

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