EASY
9th CBSE
IMPORTANT
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How is pitch of sound related to its frequency?

Important Questions on Sound

EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 22
Which part of drum vibrates to produce sound?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 23
How does the velocity of sound change when medium changes from air to water?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 24
How is ultrasound used in cleaning?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 25
Name two animals which produce ultrasound.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 26
An echo is returned in 6 seconds. What is the distance of reflecting surface from source? [given that speed of sound is 342 m s-1]
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 27
Aditi clapped her hands near a cliff and heard the echo after 4 seconds. What is the distance of the cliff from her if the speed of sound is taken as 346 m s-1.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 28
Mention two uses of multiple reflections of sound.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 29
Find the distance between a surface and the source of sound, if speed of sound is 334 m s-1 and echo returns from the surface in 1.5 s.