ECAT Pre Computer Science Chapter 8 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 8 Waves

Try The MCQ's Test For ECAT Physics Chapter 8 Waves

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ECAT Physics Chapter 8 Waves

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Question # 1

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

Question # 2

Which one of the following elasticizes is possessed by fluids:

Question # 3

Sound waves in air always

Question # 4

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

Question # 5

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

Question # 6

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

Question # 7

The instantaneous velocity of a body moving along a circle is directed

Question # 8

The waves produced in a microwave oven have wavelength.

Question # 9

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

Question # 10

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

Question # 11

The temperature at which the speed of sound becomes double as was at 27°C is

Question # 12

The example of mechanical wave is

Question # 13

The weight 'mg' of the bob is resolved into

Question # 14

Laplace formula is derived from

Question # 15

When a mass 'm' is pulled slowly, the spring stretches by an amount x0,then the average force would be

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ECAT Physics Chapter 8 Important MCQ's

Sr.# Question Answer
1 The force which opposes the applied force producing the displacement in the spring is called
A. restoring force
B. periodic force
C. centripetal force
D. resistive force
2 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
3 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
4 Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as
A. waves
B. beat
C. interference
D. resonance
5 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
6 The characteristic of a body executing S.H.M is that its acceleration is
A. inversely proportional to displacement
B. directly proportional to displacement
C. independent of displacement
D. equal to zero
7 A physical system under going forced vibrations is known as
A. Simple harmonic oscillator
B. Compound harmonic oscillator
C. Physical harmonic oscillator
D. driven harmonic oscillator
8 Sound waves in air always
A. Longitudinal
B. Transverse
C. Stationary
D. Electromagnetic
9 Which one of the following is an example of resonance
A. swing
B. tuning a radio
C. microwave oven
D. all of them
10 Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?
A. 400 m/sec
B. 40 m/sec
C. 430 m/sec
D. 300 m/sec

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