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

Sound waves in air always

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

A second's pendulum is a pendulum whose time period is

Question # 6

The square of 0.4 is:

Question # 7

If a wave can be polarized, it must be

Question # 8

The waves which propagate through the oscillations of material particles are known as:

Question # 9

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

Question # 10

The principle of superposition states that

Question # 11

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

Question # 12

If F=0.04 N and X=4 cm then K=

Question # 13

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

Question # 14

At 'resonance' the transfer of energy from deriving source to the oscillator is

Question # 15

The natural frequency of a pendulum which is vibrating freely, depends upon its

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ECAT Physics Chapter 8 Important MCQ's

Sr.# Question Answer
1 The expression for restoring force is
A. F=ma
B. F=kx
C. F= -kx
D. Kx=ma
2 If the length of a simple pendulum is 0.25 m its time period would be
A. 1.0 s
B. 2.0 s
C. 3.0 s
D. 4.0 s
3 Example of vibratory motion is
A. mass suspended from a spring
B. a bob of simple pendulum
C. mass attached to a spring placed
D. all of them
4 If the mass of the simple pendulum becomes double, its time period
A. increase
B. decreases
C. remains constant
D. none of them
5 The vibratory motion of a body whose magnitude of acceleration is directly proportional to the magnitude of its displacement and is always directed towards the equilibrium position is called
A. rotatory motion
B. motion under gravity
C. angular motion
D. simple harmonic motion
6 Mechanical waves on the surface of a liquid are
A. Transverse
B. Longitudinal
C. Torsional
D. both transverse and longitudinal
7 The vibrations of factory floor caused by the running of heavy machinery is an example of
A. free vibration
B. natural vibrations
C. forced vibrations
D. all of them
8 For production of beats the two sources must have
A. Different frequencies and same amplitude
B. Different frequencies
C. Different frequencies, same amplitude and same phase
D. Different frequencies and same phase
9 The frequency of free vibrations is known as
A. free frequency
B. forced frequency
C. natural frequency
D. un-natural frequency
10 The speed of sound in a medium depends on
A. The elastic property but not on the inertia property
B. The inertia property but not on the elastic property
C. The elastic property as well as the inertia property
D. Neither the elastic property nor the inertia property

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