ECAT Pre Engineering Physics Chapter 8 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 8 Waves

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Physics ECAT Pre Engineering Chapter 8 Waves

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Question # 1

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

Question # 2

The velocity of sound in air depends upon

Question # 3

An object undergoes S.H.M has maximum speed when its displacement from the mean position is

Question # 4

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

Question # 5

When an oscillatory motion repeats itself, then this type of motion is called

Question # 6

For production of beats the two sources must have

Question # 7

Such oscillations in which the amplitude decreases steadily with time, are called

Question # 8

In case of mechanical waves, we study the motion of

Question # 9

The distance covered by the wave during one period is called its:

Question # 10

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

Question # 11

If a freely oscillating system is subjected to an external force, then

Question # 12

Crests and troughs are formed in:

Question # 13

SI unit of wave length is:

Question # 14

Which of the following does not exhibit S.H.M?

Question # 15

Decibel is unit of

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Sr.# Question Answer
1 Which of the following is not mechanical wave?
A. Sound wave
B. Light wave
C.
wave produced in spring
D. None of them
2 In stationary waves
A. Energy is uniformly distributed
B. Energy is minimum at nodes and maximum at antinodes
C. Energy is maximum at nodes and minimum at antidotes
D. Alternating maximum and minimum energy producing at nodes and antinodes
3 The time required to complete on vibration is called
A. frequency
B. total time
C. time period
D. velocity
4 The resonance will be sharp, if the amplitude decreases rapidly at a frequency
A. equal to the resonant frequency
B. slight different from the resonant frequency
C. greatly different from the resonant frequency
D. any one of them
5 Sound waves in air always
A. Longitudinal
B. Transverse
C. Stationary
D. Electromagnetic
6 The process in which energy is dissipated from the oscillating system is known as
A. resonance
B. interference
C. diffraction
D. damping
7 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
8 When a mass 'm' is pulled slowly, the spring stretches by an amount xo, then the work done will be
A. W=Kxo
B. W=1/2Kxo
C. W=1/2Kx2o
D. W=4Kxo
9 When half of the cycle of a body executing S.H.M is completed, then the phase of the vibration will be
A. 45°
B. 90°
C. 135°
D. 180°
10 A body is executing free vibrations when it oscilates
A. with the interference of an external force
B. without the interference of an external force
C. with the interference of an internal force
D. none of them

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