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’s effect is applicable for
(A) Light waves
(B) Sound waves
(C) Space waves
(D) Both (A) and (B)
Option d – Both (A) and (B)
When T.V. is switched on
(A) Audio and video both start simultaneously
(B) Audio is heard immediately but the video starts later because the video needs some warm-up time
(C) Video starts immediately but the audio is heard later because sound travels at a lesser speed than light
(D) It depends on the T.V. brand
Option a – Audio and video both start simultaneously
The tolerable limit of noise for human beings is around
(A) 45 decibel
(B) 85 decibel
(C) 125 decibel
(D) 155 decibel
Option b – 85 decibel
Sound above what level (in decibels) is considered hazardous noise pollution?
(A) 30 dB
(B) 100 dB
(C) 80 dB
(D) 120 dB
Option c – 80 dB
The optimum sound level for human beings is
(A) 90 dB
(B) 60 dB
(C) 120 dB
(D) 100 dB
Option b – 60 dB
A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear the sound of the blow of the workman twice. It is because
(A) The speed of sound is greater in steel than in air
(B) The speed of sound is greater in the air than in steel
(C) Part of the sound wave is reflected between the rail tracks
(D) His ears are at a different distance from the source
Option a – The speed of sound is greater in steel than in air
When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in
(A) pitch, loudness, and quality
(B) pitch and loudness
(C) quality only
(D) loudness only
Option c – quality only
Which of the following has the longest wavelength?
(A) Infrared
(B) X-rays
(C) Visible light
(D) Radio waves
Option d – Radio waves
Which one of the following does a TV remote control unit use to operate a TV set?
(A) Light waves
(B) Sound waves
(C) Microwaves
(D) Radio waves
Option d – Radio waves
Which type of electromagnetic radiation is used in the remote control of a television?
(A) Infrared
(B) Ultraviolet
(C) Visible
(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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