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Sound MCQ Class 9. We covered all the Sound MCQ Class 9 in this post for free so that you can practice well for the exam.
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Sound Objective MCQ Class 9 for Students
In which of the following option sound may not travel across?
A) Water
B) Vacuum
C) Iron
D) Air
Option b – Vacuum
Sound waves do not travel in
A) Solids
B) Liquids
C) Gases
D) Vacuum
Option d – Vacuum
The walls of the ball, built for music concerts should
A) Amplify sound
B) Transmit sound
C) Reflect sound
D) Absorb sound
Option d – Absorb sound
To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
A) 165 feet
B) 165 meters
C) 16.5 feet
D) 16.5 meter
Option d – 16.5 meter
How much should the minimum distance be between the source of sound and the reflecting surface, so that an echo can be heard clearly?
A) 10 metre
B) 17 metre
C) 24 metre
D) 30 metre
Option b – 17 metre
Two astronauts cannot hear each other on the Moon’s surface, because
A) Their ears have stopped working on the Moon
B) No atmosphere on the Moon
C) They wear special space suits on the Moon
D) The sound travels much more slowly on the Moon
Option b – No atmosphere on the Moon
An astronaut cannot hear his companion at the surface of the Moon because
A) Produced frequencies are above the audio frequency
B) Temperature is too low during the night and too high during the day
C) There is no medium for sound propagation
D) There are many craters on the surface of the Moon
Option c – There is no medium for sound propagation
In which medium is the speed of sound maximum at a temperature of around 20°C?
A) Air
B) Granite
C) Water
D) Iron
Option d – Iron
Sound waves
A) can travel in a vacuum
B) can travel only in solids
C) can travel only in gases
D) can travel both in a solid and gaseous medium
Option d – can travel both in a solid and gaseous medium
The velocity of sound is maximum in
A) Air
B) Liquid
C) Metal
D) Vacuum
Option c – Metal
Sound waves travel fastest in
A) Solids
B) Liquids
C) Gases
D) Vacuum
Option a – Solids
We covered all the sound mcq class 9 above in this post for free so that you can practice well for the exam.
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