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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 media does sound fail to propagate?
A) Water
B) Vacuum
C) Iron
D) Air
Option b – Vacuum
sound waves cannot travel through
A) Solids
B) Liquids
C) Gases
D) Vacuum
Option d – Vacuum
The interior walls of a hall designed for musical performances should mainly
A) Increase the loudness of sound
B) Allow sound to pass through
C) Reflect sound waves
D) Absorb sound waves
Option d – Absorb sound waves
For a distinct echo to be heard, the minimum separation between the observer and the reflecting surface must be
A) 165 feet
B) 165 metres
C) 16.5 feet
D) 16.5 metres
Option d – 16.5 metres
What is the least distance required between a sound source and a reflecting surface to hear a clear echo?
A) 10 metres
B) 17 metres
C) 24 metres
D) 30 metres
Option b – 17 metres
Two astronauts are unable to hear each other on the surface of the Moon because
A) Their hearing does not function on the Moon
B) The Moon has no Atmosphere
C) They are wearing space suits
D) Sound travels very slowly on the Moon
Option b – The Moon has no Atmosphere
An astronaut cannot hear another astronaut on the Moon since
A) The sound frequencies produced are beyond the audible range
B) Extreme temperature variations affect sound
C) There is no medium for sound transmission
D) The lunar surface has many craters
Option c – There is no medium for sound transmission
At approximately 20°C, sound travels fastest in which medium?
A) Air
B) Granite
C) Water
D) Iron
Option d – Iron
Sound waves
A) Can propagate in a vacuum
B) Travel only through Solids
C) Travel only through gases
D) Can travel through both Solids and gases
Option d – Can travel through both Solids and gases
The speed of sound is highest in
A) Air
B) Liquid
C) Metal
D) Vacuum
Option c – Metal
Sound waves move most rapidly through
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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