ECAT Pre General Science Physics Chapter 8 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 8 Waves

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ECAT Pre General Science Physics Chapter 8 Waves

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Question # 1

The bob of a simple pendulum is suspended by

Question # 2

Energy is dissipated and consequently the energy mass system do not oscillate indefinitely because of

Question # 3

If the length of a simple pendulum is 0.25 m its time period would be

Question # 4

Example of progressive wave is

Question # 5

The expression of Hook's law is

Question # 6

The frequency of free vibrations is known as

Question # 7

The wave motion set up in any medium depends upon:

Question # 8

Two sources of sound are said to be coherent if

Question # 9

If the displacement of a body executing S.H.M is plotted against time, then the curve is known as

Question # 10

For production of beats the two sources must have

Question # 11

When a mass 'm' is pulled slowly through a distance 'xo' , the elastic potential energy of the spring would be

Question # 12

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

Question # 13

A swing has

Question # 14

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

Question # 15

A wave, which transfer energy by moving away from the source of disturbance is called a

Question # 16

Which of the following is not mechanical wave?

Question # 17

The weight 'mg' of the bob is resolved into

Question # 18

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

Question # 19

The velocity of sound in air not effected by changes in

Question # 20

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

Question # 21

When half of the cycle of a body executing S.H.M is completed, then the phase of the vibration will be

Question # 22

If one end of a rubber cord is fixed with a support and the other end is wiggled by hand, the waves generated on the card are:

Question # 23

Smaller the damping, greater will be the

Question # 24

If a wave can be polarized, it must be

Question # 25

When sound waves travel from air to water which of these remains constant?

Question # 26

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

Question # 27

The force which opposes the applied force producing the displacement in the spring is called

Question # 28

Mechanical waves on the surface of a liquid are

Question # 29

Through which character we can distinguish the light waves from sound waves

Question # 30

Acceleration of the mass at any instant is given by

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ECAT Physics Chapter 8 Important MCQ's

Sr.# Question Answer
1 The instantaneous velocity of a body moving along a circle is directed
A. along the radius
B. along the tangent
C. away from the circle
D. none of them
2 Which of the following is the longitudinal waves?
A. Sound waves
B. Waves on plucked string
C. Water waves
D. Light waves
3 In the same medium, velocity of the wave:
A. Goes on increasing
B. Remains constant
C. Goes on decreasing
D. None of these
4 For a body executing S. H. M, its
A. momentum remains constant
B. potential energy remains constant
C. kinetic energy remains constant
D. total energy remains constant
5 When a body is pulled away from its rest or equilibrium position and then released, the body oscillates due to
A. applied force
B. momentum
C. restoring force
D. none of them
6 One complete round trip of the body about its mean position is called
A. displacement
B. vibration
C. a complete motion
D. an acceleration
7 When a wave is travels from one place to another, it transfers:
A. Matter
B. Energy
C. Momentum
D. Both B and C
8 The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be
A. 1 : 2
B. 4 : 1
C. 1 : 4
D. 2 : 1
9 The velocity of sound at same temperature is maximum in
A. H2
B. N2
C. O2
D. NH3
10 Which of the following does not exhibit S.H.M?
A. a plucked violin string
B. a mass attached to a spring
C. a train shunting between two terminals
D. a simple pendulum

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