MEDIUM
8th CBSE
IMPORTANT
Earn 100

What are the sources of noise pollution? List some ways of controlling noise pollution.

Important Questions on Sound

EASY
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>Quick Check?>Q c)
Amplitude is the smallest distance moved by vibrating particles on either side of the mean position.
EASY
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>Quick Check?>Q d)
Increase in the number of vibrations in a given time increases the frequency.
EASY
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>Quick Check?>Q e)
Human beings cannot hear sounds with frequencies less than 20 Hz.
HARD
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>Put on your thinking cap>Q 5
What is hearing impairment? How can people with condition communicate?
HARD
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>Put on your thinking cap>Q 6

Look at the given picture and answer the following.

(i) Identify musical instrument shown in the figure.

(ii) How does it produce sound?

(iii) How does sound produced by an instrument reach ears.
C:\Users\pc\Documents\062.png

MEDIUM
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>HOTS>Q 1
People on the surface of the moon use radio sets to communicate. Why?
HARD
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>HOTS>Q 2
Why a person is unable to speak when a larynx is pressed hard?
MEDIUM
8th CBSE
IMPORTANT
Galaxy A Course in Science Book 8>Chapter 13 - Sound>AT A GLANCE>Q 1
Complete the mind map given below.
imgpsh_fullsize_anim.png