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mcq of sound Class 9. We covered all the mcq of sound Class 9 in this post for free so that you can practice well for the exam.
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Objective mcq of sound Class 9 for Students
The Doppler effect can be observed in relation to which of the following waves?
(A) Light waves
(B) sound waves
(C) Space waves
(D) Both Light and sound waves
When a television is switched on
(A) Both sound and picture appear at the same time
(B) sound is heard first, followed by the picture due to video warm-up time
(C) Picture appears first because Light travels faster than sound
(D) It varies according to the television model
Option a – Both sound and picture appear at the same time
The maximum noise level generally considered tolerable for humans is about
(A) 45 decibels
(B) 85 decibels
(C) 125 decibels
(D) 155 decibels
Option b – 85 decibels
Noise levels above which value are regarded as harmful noise Pollution?
(A) 30 dB
(B) 100 dB
(C) 80 dB
(D) 120 dB
Option c – 80 dB
The most comfortable sound level for human hearing is approximately
(A) 90 dB
(B) 60 dB
(C) 120 dB
(D) 100 dB
Option b – 60 dB
A boy places his ear on a Railway track and hears the sound of a worker’s hammer twice. This happens because
(A) Sound travels faster in steel than in air
(B) Sound travels faster in air than in steel
(C) Sound waves reflect repeatedly between the rails
(D) The boy’s ears are positioned at different distances
Option a – Sound travels faster in steel than in air
When the same musical note is played on a sitar and a flute, they sound different mainly due to a difference in
(A) Pitch, loudness, and quality
(B) Pitch and loudness
(C) Quality (timbre) only
(D) Loudness only
Option c – Quality (timbre) only
Which of the following electromagnetic waves has the greatest wavelength?
(A) Infrared rays
(B) X-rays
(C) Visible Light
(D) Radio waves
Option d – Radio waves
Which type of waves is used by a television remote control to operate a TV?
(A) Light waves
(B) Sound waves
(C) Microwaves
(D) Radio waves
Option d – Radio waves
Television remote controls primarily make use of which electromagnetic radiation?
(A) Infrared
(B) Ultraviolet
(C) Visible Light
(D) None of these
Option a – Infrared
We covered all the mcq of sound Class 9 above in this post for free so that you can practice well for the exam.
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