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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.
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Physics Waves Practice Test Online With Explanation

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Page 1 of 4

Physics

1. Decibel is unit of

Sound loudness

Intensity of light

Energy of radiation

x-ray radiation capacity

2. 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

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

Mechanical waves

Carrier waves

Matter waves

Electromagnetic waves

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

Exponential

Linear

Logarithmic

Hyperbolic

5. 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

300 Nm¯¹

143 Nm¯¹

700 Nm¯¹

100 Nm¯¹

6. Sound waves do not travel in vacuum because

They are transverse waves

They are stationary waves

They require material medium for propagation

They do not have enough energy

7. 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 maximum, α is maximum

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

When v is zero, α is zero

When v is maximum, α is zero

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

(9/10)²

11/10

10/9

(11/10)²

9. 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/12

T/8

T/2

T/4

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

60°

90°

180°

120°

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

None of these

Amplitude of motion will be every small

Independent of amplitude of motion

Amplitude of motion will be very large

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

At rest

Half way between them

Displacement is maximum

Crossing mean position

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

16.5 m

10 m

66 m

33 m

14. The speed of sound in a medium depends on

The elastic property but not on the inertia property

Neither the elastic property nor the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

15. 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

2 s

4 s

1 s

3 s

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

Increase

Remains same

Become zero

Decrease

17. 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 capacity

Has a definite pitch

Has a definite quality

18. Doppler-effect applies to

Light wave only

Both sound and light waves

Sound wave only

Neither sound nor light wave

19. In simple harmonic motion,

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

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

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

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

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

Visible light

Infra-red radiation

Ultra-violet rays

Gamma rays

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

4π second

π second

2π second

1 second

22. 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

3/2 m

3/32 m

32/3 m

23. Waves transmit _________ from one place to another

Both

Energy

Mass

None of these

24. Fidelity refers to

Reproduction of a CD from original copy

Reproduction of original sound

Reproduction of original image

Reproduction of music

25. Sound waves in air always

Transverse

Longitudinal

Electromagnetic

Stationary

Page 2 of 4

26. The velocity of sound is greatest in

Water

Vacuum

Air

Metal

27. The gases have a

None of these

Large elastic modulus

Zero elastic modulus

Smaller elastic modules

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

None of these

Wavelength

Frequency

Amplitude

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

In phase

Sometimes in phase

Out of phase

None of these

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

Remains same

Decreases

Increases

Increases or decreases depending on the material

31. 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:

6 m

1/36 m

1/6 m

36 m

32. A system under going force vibrations is known as

Frequency harmonic oscillator

Driven harmonic oscillator

Vibration harmonic oscillator

None

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

42Hz

7Hz

256Hz

262Hz

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

Doppler effect

Interference

Beat phenomenon

Resonance

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

1.35

1.40

1.56

1.26

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

2,000 to 4,000 Hz

3,000 to 6,000 Hz

4,000 to 8,000 Hz

5,000 to 11,000 Hz

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

Density only

Neither pressure nor density

Both pressure and density

Pressure only

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

The energy is redistributed and the distribution remains constant with time

There is a loss of energy

There is a gain of energy

The energy is redistributed and the distribution changes with time

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

Optics

Statics

Acoustics

Wave mechanics

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

Damping force is small

Quality factor is small

Restoring force is small

Applied periodic force is small

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

1214 ms¯¹

1343 ms¯¹

1567 ms¯¹

1483 ms¯¹

42. The Doppler effect is produced if

Both the above

The detector is in motion

None of these

The source is in motion

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

100000 Hz

10 Hz

1 GHz

1 MHz

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

Polarization

Refraction

Interference

Reflection

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

Interference of waves

All of these

Doppler effect

Beats phenomena

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

An apparent increase in frequency

No apparent change in frequency

An apparent decrease in frequency

An apparent decrease in wavelength

47. Energy is not carried by

Electromagnetic waves

Stationary waves

Longitudinal vibration

Transverse progressive waves

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

Remains constant

Increases

Decreases

Becomes Zero

49. An oscillating mass-spring system generates

Mechanical waves

Progressive waves

Periodic waves

None of these

50. The velocity of sound in air depends upon

Pressure

Amplitude and frequency of sound

Wavelength of sound

Density and elasticity of gas

Page 3 of 4

51. Silence zone takes place due to

Destructive interference

Resonance

Beats

Constructive interference

52. In stationary waves

Energy is uniformly distributed

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

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

The atmospheric pressure

Moisture contents in air

The composition of air

Temperature of air

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

Becomes zero

Increases

Decreases

Remains unchanged

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

Independent of x

∞ x

∞√x

∞ x²

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

Wave length

Frequency

Period

Phase difference

57. 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

Decrease

Become infinite

Remain unaffected

Increase

58. The distance between node and antinode is

2λ

λ/2

λ/4

59. Velocity of sound in vacuum is

320 ms-1

224 ms-1

332 ms-1

Zero

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

Frequency and number of harmonic

Frequency and velocity

Intensity and velocity

Intensity and frequency

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

Maximum in the extreme position

None of these

Zero in the mean position

Constant

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

2 λ

3/2 λ

λ/2

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

6 times faster

√6 times slower

At correct rate

√6 times faster

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

360 m/s

340 m/s

331 m/s

306 m/s

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

Transverse wave

Progressive wave

Longitudinal waves

None of these

66. 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

k₂/k₁

k₁/k₂

√k₁/k₂

67. 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

5α – 4β

9 (β – α)

β – α

5 β – 4 α

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

Oscillation

Resonance

Damping

None of these

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

Transverse stationary

Transverse progressive

Longitudinal progressive

Longitudinal stationary

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

1000

156

330

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

Sonic speed

None of these

Supersonic speed

Extra supersonic speed

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

Same as that of the individual waves

Twice that of the individual waves

√2 that of the individual waves

Half that of the individual waves

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

λ/4

λ/2

2λ

74. In stationary waves

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

75. What sort of waves exhibit the Doppler effect?

Light waves

Water waves

Sound waves

All of these

Page 4 of 4

76. Beats are the results of

Diffraction of sound waves

Constrictive and destructive interference

Polarization

Destructive interference

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

1 : 2

2 : 1

4 : 1

1 : 4

78. The distance between node and anti-node is

λ/2

λ/4

2λ

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

Half the mass

Quadruple the mass

Double the mass

Reduce the mass to one fourth

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

Have a lower frequency

Cannot be diffracted

Cannot be polarized

Do not affect photographic plate

81. For production of beats the two sources must have

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same amplitude

Different frequencies and same phase

82. 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:

3.2 kg

12.6 kg

1.6 kg

9.6 kg

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

1 second

1/T seconds

F seconds

1/f seconds

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

Time period

Wave

Oscillation Time

Reverberation

85. In vibratory motion which parameter remains constant?

Total Energy

P.E. Energy

K.E. Energy

Angular Momentum

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

Refraction

Polarization

Interference

Diffraction

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

An ellipse

A circle

A hyperbola

A straight line

88. 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 increase

Time period will depend on the weight of the boy.

Time period will decrease

Time period will not change

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

Reflection

Refraction

Diffraction

Polarization

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

k₁+k₂

√k₁k₂

(k₁+k₂)/2

k₁ k₂/( k₁+k₂)

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

Energy

Energy, momentum and mass

Energy and linear momentum

Energy and mass

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

Becomes double

Remains same

Become one fourth

Becomes one half

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

Simple Harmonic Motion

Angular Motion

Rectilinear Motion

Circular Motion

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

None of these

Increased rapidly

Increased

Decreased

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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

Physics Waves Online Mcqs Test

Important Waves Question and Answer

Physics Waves Practice Test Online With Explanation

Physics

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