A human ear can oscillate back and forth up to

18,000 times per second
200 times per second
20,000 times per second
100 times per second
20,000 times per second  

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The number of vibrations of a body in one sec is called
A. frequency
B. amplitude
C. time period
D. vibration
The force that pulls the mass towards mean position is called
A. Gravitational force
B. Frictional force
C. Torque
D. Restoring force
If the spring is stretched or compressed through a small displacement x from its mean position, then on mass it exerts a
A. strain
B. stress
C. energy
D. force
Time taken by a body to complete one vibration is
A. amplitude
B. frequency
C. time period
D. vibration
Heatwaves are
A. electromagnetic
B. mechanical
C. transverse
D. chemical waves
If 160 waves pass through a point of a medium in 40 seconds. Its frequency is
A. 4 Hz
B. 2 Hz
C. 5 Hz
D. 3 Hz
The categories of waves are
A. 3
B. 4
C. 2
D. 5

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