ECAT Pre Computer Science Chapter 8 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 8 Waves

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ECAT Physics Chapter 8 Waves

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Question # 1

When temperature increase, the frequency of a tuning fork

Question # 2

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

Question # 3

Velocity of sound in vacuum (in m/s) is

Question # 4

When the bob of simple pendulum is at extreme position, its K.E. will be

Question # 5

The square of 0.4 is:

Question # 6

Shock absorber of the car is an example of

Question # 7

If we increase the length of a simple pendulum four times, its time period will become

Question # 8

There is no net transfer of energy by particle of medium in

Question # 9

In a resonance situation the amplitude of the motion may become extra ordinarily large, if

Question # 10

The time period of pendulums of different lengths would be

Question # 11

Which of the following is an example of a S.H.M?

Question # 12

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

Question # 13

The velocity of sound is greatest in

Question # 14

When a body is pulled away from its rest or equilibrium position and then released, the body oscillates due to

Question # 15

Ultra-violet rays differ from X-rays in that they

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ECAT Physics Chapter 8 Important MCQ's

Sr.# Question Answer
1 When a mass 'm' is pulled slowly through a distance 'xo' , the elastic potential energy of the spring would be
A. P.E=Kx2o
B. P.E= 1/2kxo
C. P.E=1/2Kx2o
D. P.E=Kx2o
2 The waves produced in a microwave oven have wavelength.
A. 12 mm
B. 12 cm
C. 12 m
D. 12 mm
3 Velocity of sound in vacuum (in m/s) is
A. 330
B. 1000
C. 156
D. 0
4 If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be
A. Increasing by a factor of 2
B. Decreasing by a factor of 2
C. Decreasing by a factor of 4
D. Unchanged
5 For transmission of both transverse and longitudinal waves, we can use:
A. Solid
B. Gas
C. Plasma
D. None of these
6 If the time period a simple pendulum is 2 s, its frequency would be
A. 2 Hz
B. 1.5 Hz
C. 1.0 Hz
D. 0.5 Hz
7 The expression for restoring force is
A. F=ma
B. F=kx
C. F= -kx
D. Kx=ma
8 In compressional wave,the layer of medium having reduced pressure is called:
A. Compression
B. Elasticity
C. Node
D. Rarefaction
9 Which of the following is the longitudinal waves?
A. Sound waves
B. Waves on plucked string
C. Water waves
D. Light waves
10 Two sources of sound are said to be coherent if
A. The produce sounds of equal intensity
B. They produce sounds of equal frequency
C. They produce sound waves vibrating with the same phase
D. They produce sound waves with zero or constant phase difference all instant of time

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