HARD
8th Chhattisgarh Board
IMPORTANT
Earn 100

Sound is heard clearly in a big room with curtains on its walls rather than in a room without curtains. Why?

Important Questions on Sound

EASY
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 1
What makes an object produce sound?
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 2
When we ring a cycle bell with one hand while holding it with the other, then its sound is not heard clearly. Why?
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 3
The frequency of an vibrating objects is 20 hertz. What do you understand by this statement?
HARD
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 4
An object completes 20 oscillations in ten seconds. Find its frequency and time period.
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 1
On the surface of the moon why can the voice of an astronaut not be heard by the other astronaut standing nearby?
EASY
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 2
Who was the first to suggest that a medium is needed for the propagation of sound?
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 1
Write the difference between audible and ultrasonic sounds.
EASY
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 10 - Sound>NOW ANSWER THESE>Q 2
Write two uses of ultrasonic sound.