MEDIUM
9th West Bengal Board
IMPORTANT
Earn 100

Distinguish between compression and rarefaction.

Important Questions on Sound

EASY
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 3
Which of the following is not a string instrument?
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 3.6.
What is a megaphone? How does it work?
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 3.7.
Why a male voice is different from a female voice?
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 3.8.
What are ultrasonic sounds? How bats use that to catch prey?
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 3.9.
How the speed of sound is affected by the direction of moving wind?
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 3.10.
Why do we not hear echo at all places?
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 4.4.
What do you mean by echo? Calculate the minimum distance from a sound reflecting surface to hear an echo.
MEDIUM
9th West Bengal Board
IMPORTANT
PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 7 - Sound>EXERCISE>Q 4.5.
How the method of SONAR can be applied to measure the depth of the sea?