Physics Waves Online Mcqs Test

Malik TahirLast Updated: October 13, 2025

Important Waves Question and Answer

Total Questions:	94
Time Allowed:	40 Minutes
Total Marks:	94
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Physics Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Physics Interview Question Answer

Physics Waves Practice Test Online With Explanation

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Page 1 of 4

Physics

1. Sound waves do not travel in vacuum because

They are transverse waves

They do not have enough energy

They are stationary waves

They require material medium for propagation

2. The response of the human ear to the loudness of sound is _________ in nature:

Logarithmic

Linear

Exponential

Hyperbolic

3. When a body moves in a circle, its projection performs what type of motion?

Circular Motion

Angular Motion

Rectilinear Motion

Simple Harmonic Motion

4. Which of the following changes at an antinode is a stationary wave?

Both pressure and density

Pressure only

Density only

Neither pressure nor density

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

1000

330

156

6. Doppler-effect applies to

Sound wave only

Light wave only

Both sound and light waves

Neither sound nor light wave

7. Beats are the results of

Diffraction of sound waves

Destructive interference

Constrictive and destructive interference

Polarization

8. Decibel is unit of

Intensity of light

x-ray radiation capacity

Energy of radiation

Sound loudness

9. Reflection of radar waves from the aero planes is an example of

Interference

Beat phenomenon

Doppler effect

Resonance

10. It is possible to distinguish between transverse and longitudinal waves form the property of

Polarization

Refraction

Diffraction

Interference

11. A mass m attached to a spring oscillate every 2 sec. If the mass increases by 2 kg, then time period increases by 1 sec. The initial mass of the body is:

1.6 kg

9.6 kg

3.2 kg

12.6 kg

12. If two waves of amplitude ‘A’ produce a resultant wave of amplitude A, then the phase difference between them will be

60°

90°

120°

180°

13. The waves moving from a sitar to a listener in air are

Longitudinal stationary

Transverse stationary

Longitudinal progressive

Transverse progressive

14. In a seconds pendulum, mass of the bob is 30 gm. If it is replaced by 90 gm mass. Then its time period will be

1 s

2 s

4 s

3 s

15. In a progressive wave, the distance between two consecutive crests is

λ/2

2 λ

3/2 λ

16. One wavelength is the distance covered in a time is called

Time period

Wave

Reverberation

Oscillation Time

17. With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

18. In stationary waves

Energy is maximum at nodes and minimum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

19. When two identical traveling waves are superimposed, the velocity of the resultant wave

Decreases

Remains unchanged

Increases

Becomes zero

20. In simple harmonic motion,

The velocity and acceleration of the vibrating particle are in the same phase

The acceleration of the vibrating particle is ahead of displacement by a phase of π

The velocity and displacement of the vibrating particle are in the same phase

The velocity of the vibrating particle is ahead in phase of the displacement by and angle π

21. In a garden, a boy is swinging in the standing position. How will the time period of the swing be affected if the boy sits down on the swing?

Time period will depend on the weight of the boy.

Time period will not change

Time period will decrease

Time period will increase

22. A sound source is moving towards stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is

10/9

11/10

(11/10)²

(9/10)²

23. One spring has force constant 200 Nm¯¹, another has force constant 500 Nm¯¹. If they are joined in series, the force constant will be nearest to

700 Nm¯¹

143 Nm¯¹

100 Nm¯¹

300 Nm¯¹

24. If is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice.

Can penetrate the wall

Has a definite quality

Has a definite pitch

Has a definite capacity

25. The distance between any two consecutive crests or troughs is called

Period

Phase difference

Wave length

Frequency

Page 2 of 4

26. In vibratory motion which parameter remains constant?

Angular Momentum

P.E. Energy

Total Energy

K.E. Energy

27. Maximum acceleration of an object in simple harmonic motion is 24 m/s² and maximum velocity is 16 m/sec. Then amplitude of SHM is

2/3 m

32/3 m

3/32 m

3/2 m

28. For motion of a simple pendulum to be simple harmonic

Amplitude of motion will be every small

Amplitude of motion will be very large

Independent of amplitude of motion

None of these

29. The distance between node and antinode is

2λ

λ/2

λ/4

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

331 m/s

340 m/s

360 m/s

306 m/s

31. Which one of the following instances are the waves plane-polarized?

Gamma rays

Visible light

Ultra-violet rays

Infra-red radiation

32. When a stationary wave is formed then its frequency is

Half that of the individual waves

√2 that of the individual waves

Twice that of the individual waves

Same as that of the individual waves

33. Sound waves in air always

Electromagnetic

Stationary

Transverse

Longitudinal

34. What is frequency of radio waves transmitted by a station, if the wavelength of these waves is 300 m?

1 GHz

100000 Hz

1 MHz

10 Hz

35. Ultra Violet rays differ X rays in that ultra violet rays

Have a lower frequency

Cannot be diffracted

Do not affect photographic plate

Cannot be polarized

36. A particle executes SHM. The graph of its velocity as a function of displacement is

An ellipse

A circle

A hyperbola

A straight line

37. The points at which the distance separated by λ, 2λ, 3λ, ........ are

Sometimes in phase

Out of phase

In phase

None of these

38. Applications of the results of scientific studies in the designs of buildings etc. is called:

Acoustics

Wave mechanics

Optics

Statics

39. Which one is not produce by sound waves in air?

Reflection

Polarization

Diffraction

Refraction

40. Two springs of spring constants k₁ and k₂ are joined in series. The effective spring constant of the combination is given by

k₁ k₂/( k₁+k₂)

k₁+k₂

√k₁k₂

(k₁+k₂)/2

41. If mass attached to a spring increases, then its time period

Increases

Remains constant

Becomes Zero

Decreases

42. The restoring force of S.H.M. is maximum when particle:

Displacement is maximum

At rest

Half way between them

Crossing mean position

43. The human ear is most sensitive in the frequency range of:

4,000 to 8,000 Hz

2,000 to 4,000 Hz

3,000 to 6,000 Hz

5,000 to 11,000 Hz

44. When temperature increases, the frequency of a tuning fork

Decreases

Increases

Increases or decreases depending on the material

Remains same

45. A wave is which the displacement of the wave travel perpendicular to the direction of propagation of waves is called

Longitudinal waves

Transverse wave

Progressive wave

None of these

46. Which phenomena can be applied to estimate the velocity of star with respect to earth?

Interference of waves

Doppler effect

Beats phenomena

All of these

47. The velocity of sound is greatest in

Air

Metal

Vacuum

Water

48. Energy is not carried by

Electromagnetic waves

Stationary waves

Longitudinal vibration

Transverse progressive waves

49. If the period of oscillation of mass m suspended from a spring is one second, then the period of 4 m will be:

4 sec

2 sec

¼ sec

½ sec

50. Fidelity refers to

Reproduction of original sound

Reproduction of a CD from original copy

Reproduction of music

Reproduction of original image

Page 3 of 4

51. In case of a forced vibration, the resonance becomes very sharp when the

Quality factor is small

Damping force is small

Applied periodic force is small

Restoring force is small

52. Which one of the following statements is true for the speed v and the acceleration α of a particle executing simple harmonic motion?

When v is zero, α is zero

When v is maximum, α is maximum

When v is maximum, α is zero

Value of α is zero, whatever may be the value of v

53. The velocity of sound in air depends upon

Density and elasticity of gas

Wavelength of sound

Amplitude and frequency of sound

Pressure

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

Interference

Reflection

Refraction

Polarization

55. A body with frequency f would complete one vibration in

1 second

F seconds

1/f seconds

1/T seconds

56. Two particles A and B of equal masses are suspended from two mass less springs of spring constants k₁ and k₂ respectively. If the maximum velocities, during oscillation, are equal, the ratio of amplitudes of A and B is:

√k₂/k₁

√k₁/k₂

k₂/k₁

k₁/k₂

57. A particle executes a simple harmonic motion of time period T. Find the time taken by the particle to go directly from its mean position to half the amplitude

T/8

T/2

T/4

T/12

58. A spring-mass system oscillates with a frequency v, if it is taken in an elevator slowly accelerating upward, the frequency will

Become zero

Decrease

Remains same

Increase

59. The Doppler effect is produced if

None of these

The detector is in motion

The source is in motion

Both the above

60. The process whereby energy is dissipated from the oscillating system is called

Oscillation

Damping

None of these

Resonance

61. When a gas is heated at constant pressure, its volume is increased and its density

Decreased

Increased rapidly

None of these

Increased

62. For production of beats the two sources must have

Different frequencies and same phase

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same amplitude

63. ‘y’ is the ratio molar specific heat at constant pressure to the molar specific heat at constant volume and has value

1.26

1.56

1.35

1.40

64. To make the frequency double of a spring oscillator, we have to:

Double the mass

Quadruple the mass

Reduce the mass to one fourth

Half the mass

65. The distance between two consecutive crests or trough is called

None of these

Amplitude

Wavelength

Frequency

66. In case of a vibrating Pendulum, if the mass of the pendulum is doubled then its time period

Become one fourth

Becomes double

Becomes one half

Remains same

67. The total energy of a particle, executing simple harmonic moron is

∞√x

∞ x

∞ x²

Independent of x

68. The speed of sound in a medium depends on

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

The elastic property but not on the inertia property

69. What sort of waves exhibit the Doppler effect?

Sound waves

All of these

Light waves

Water waves

70. An oscillating mass-spring system generates

Mechanical waves

None of these

Progressive waves

Periodic waves

71. The beats frequency (sensible) for a human car is

256Hz

7Hz

262Hz

42Hz

72. A system under going force vibrations is known as

Driven harmonic oscillator

Vibration harmonic oscillator

None

Frequency harmonic oscillator

73. The distance between node and anti-node is

λ/2

2λ

λ/4

74. Velocity of sound in vacuum is

320 ms-1

224 ms-1

332 ms-1

Zero

75. When two waves with same frequency and constant phase difference interfere.

There is a gain of energy

The energy is redistributed and the distribution changes with time

There is a loss of energy

The energy is redistributed and the distribution remains constant with time

Page 4 of 4

76. The length of the second’s pendulum on the surface of Earth is 1m. Its length on the surface of moon, where g is 1/6th the value of g on the surface of Earth, is:

36 m

1/6 m

6 m

1/36 m

77. The tension in the string of a simple pendulum is

Constant

None of these

Maximum in the extreme position

Zero in the mean position

78. Speed of sound in Water at 20°C is:

1214 ms¯¹

1343 ms¯¹

1483 ms¯¹

1567 ms¯¹

79. To hear a clear echo, the reflecting surface must be at a minimum distance of

16.5 m

33 m

10 m

66 m

80. The loudness and pitch of a sound note depends on

Frequency and velocity

Frequency and number of harmonic

Intensity and velocity

Intensity and frequency

81. The velocity of sound in air not affected by changes in:

Temperature of air

Moisture contents in air

The composition of air

The atmospheric pressure

82. Silence zone takes place due to

Beats

Constructive interference

Resonance

Destructive interference

83. Waves transmit _________ from one place to another

None of these

Both

Mass

Energy

84. A sine wave is represented by Q. the distance between the two particles having same maximum displacement is

λ/4

2λ

λ/2

85. In stationary waves

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antidotes

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

86. If the magnitude of displacement is numerically equal to that of acceleration, then the time period is

4π second

2π second

1 second

π second

87. A pendulum clock that keeps correct time on the Earth is taken to the Moon. It will run

At correct rate

6 times faster

√6 times slower

√6 times faster

88. The length of a spring is ‘α’ when a force of 4N is applied on it. The length is β when 5N force is applied. Then the length of spring when 9N force is applied is

5 β – 4 α

9 (β – α)

5α – 4β

β – α

89. The gases have a

Smaller elastic modules

Zero elastic modulus

None of these

Large elastic modulus

90. The waves that require a material medium for their propagation are called

Electromagnetic waves

Carrier waves

Matter waves

Mechanical waves

91. When the source of sound moves away form a stationary listener then _________ occurs.

An apparent decrease in wavelength

No apparent change in frequency

An apparent decrease in frequency

An apparent increase in frequency

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

2 : 1

1 : 2

1 : 4

4 : 1

93. A pendulum suspended from the ceiling of a train has a period T when the train is at rest. When the train is accelerating with a uniform acceleration, the period of oscillation will

Remain unaffected

Increase

Become infinite

Decrease

94. Waves disturbances may also come in a concentrated bundles like stock waves from an airplane flying at:

Extra supersonic speed

Sonic speed

None of these

Supersonic speed

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Malik TahirLast Updated: October 13, 2025

5 Comments

Karshma says:

December 17, 2021 at 10:42 am

I am a medical student

Talha Maqsood says:

August 20, 2021 at 12:07 pm

Sir some of your own answer are wrong please correct them

Rana Zunair Mehdi says:

July 21, 2016 at 5:12 pm

Excellent website but there is problem in the answer of a mcqs of physics sample peper no.22. mcqs of “trough” the answer is above the equilibrium position but real answer from tectbook is below the equilibrium position. thanks

1. Talha Maqsood says:
  
  August 20, 2021 at 12:08 pm
  
  Yes bro I have same problem
  
Rana Zunair Mehdi says:

July 21, 2016 at 5:06 pm

Excellent website for preparation of MCAT as it includes all the mcqs from all books . help a lot to obtain higher marks. suuccessfull website

Important Waves Question and Answer

Physics Waves Practice Test Online With Explanation

Physics

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Malik Tahir

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