EASY
8th CBSE
IMPORTANT
Earn 100

Ultrasound has frequency of vibration

69.23% studentsanswered this correctly

Important Questions on Sound

EASY
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>VERY SHORT ANSWER QUESTIONS>Q 11
Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs? (speed of sound =330 m/s).
Give the solution in SI units.
MEDIUM
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>VERY SHORT ANSWER QUESTIONS>Q 12
Does any part of our body vibrate when we speak? Name the part.
EASY
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>VERY SHORT ANSWER QUESTIONS>Q 13
Boojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give reason for the delay in hearing the sound.
EASY
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>VERY SHORT ANSWER QUESTIONS>Q 14
When we hear a sound, does any part of our body vibrate? Name the part.
EASY
8th CBSE
IMPORTANT
NCERT Exemplar Science - Class 8>Chapter 13 - Sound>VERY SHORT ANSWER QUESTIONS>Q 15
Name two musical instruments which produce sound by vibrating strings?
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.