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9th CBSE
IMPORTANT
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Sound waves travel slower in vacuum than in water.

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Important Questions on Sound

EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 17
Ultrasound can be used to test planeness of metal sheets.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 18
Echo can be heard in every room.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 12 - Sound>ASSESS YOURSELF>Q 21
How is pitch of sound related to its frequency?
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]