EASY
8th CBSE
IMPORTANT
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Name two musical instruments which produce sound by vibrating strings?

Important Questions on Sound

MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>SHORT ANSWER QUESTIONS>Q 16
A simple pendulum makes 10 oscillations in 20 seconds. What is the time period and frequency of its oscillation?
EASY
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>SHORT ANSWER QUESTIONS>Q 17
We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us?
MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>SHORT ANSWER QUESTIONS>Q 18
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate? Will we be able to hear the sound? Explain.
MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>SHORT ANSWER QUESTIONS>Q 19
Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons.
 
EASY
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>SHORT ANSWER QUESTIONS>Q 20
List three sources of noise pollution in your locality.
MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>LONG ANSWER QUESTIONS>Q 21
We have a stringed musical instrument. The string is plucked in the middle first with a force of greater magnitude and then with a force of smaller magnitude. In which case would the instrument produce a louder sound?
 
MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>LONG ANSWER QUESTIONS>Q 22
How is a sound produced and how is it transmitted and heard by us?
MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>LONG ANSWER QUESTIONS>Q 23

An alarm bell is kept inside a vessel as shown in Figure. A person standing close to it can distinctly hear the sound of alarm. Now if the air inside the vessel is removed completely how will the loudness of alarm get affected for the same person?

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