HARD
8th CBSE
IMPORTANT
Earn 100

Explain how we hear.

Important Questions on Sound

EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D
The frequency of sound is measured in _____.
EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D
The maximum displacement of a vibrating body from its position of rest is its _____.
EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D
The frequency of ultrasonic is _____ than the range of human hearing. Choose from the bracket (greater, lower).
MEDIUM
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D
Sound vibrations die out after travelling some distance due to the loss of _____.(Energy/Force)
EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D
Sound needs a _____to travel.
EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D
Industrial noise can be reduced by proper _____ (maintenance/cooling).
MEDIUM
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q D

The reflecting surface has to be at least _____ metres away for us to hear an echo distinctly. 

Choose from the following: 10.4, 17.2, 22.2

EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 9 - Sound>Exercises>Q E
What helps us distinguish between the same note of the same loudness produced by two musical instruments?