MEDIUM
9th CBSE
IMPORTANT
Earn 100

Differentiate between the infrasonic vibrations and ultrasonic vibrations.

Important Questions on Sound

HARD
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 14
Differentiated between the compression and rarefaction.
MEDIUM
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 15
Differentiate between the loudness and intensity of sound.
HARD
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 16
With the help of a labelled diagram, explain the working of the human ear.
HARD
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 17
Illustrate with the help of an experiment that sound requires a medium to propagate.
MEDIUM
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 18

A sound wave of length 70 cm travels 840 m in 25 seconds. What is the velocity and frequency of sound?

Note: This question given in the book seems to have error and the modified question should be as given below.

A sound wave of length 70 cm travels 840 m in 2.5 seconds. What is the velocity and frequency of sound?
HARD
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 19
An echo is heard after 0.8 seconds, when a person fires a cracker 132.8 m from a high building. Calculate the speed of sound.
HARD
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 20
A source of wave produces, 40 crests, and 40 troughs in 0.4 seconds. Find the frequency of the wave.
MEDIUM
9th CBSE
IMPORTANT
EVERGREEN Self-Study in SCIENCE>Chapter 13 - Sound>CHAPTER TEST>Q 21
Why an echo is not heard when distance between source of sound and reflecting body is 10 m ?