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Physics Waves Online Test

Maan AliLast Updated: April 18, 2025

Physics Waves MCQS Online Test

ECAT Physics Waves Chapter Online Test

Total Questions:	94
Time Allowed:	40 Minutes
Total Marks:	94
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Physics Waves Chapter Online Test

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Page 1 of 4

Physics

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

Remains same

Becomes double

Become one fourth

Becomes one half

2. 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:

√k₁/k₂

√k₂/k₁

k₁/k₂

k₂/k₁

3. 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:

1/36 m

6 m

1/6 m

36 m

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

Amplitude

Wavelength

Frequency

None of these

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

1/T seconds

1/f seconds

F seconds

1 second

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

11/10

(11/10)²

(9/10)²

10/9

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

2 sec

¼ sec

½ sec

4 sec

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

√6 times slower

6 times faster

At correct rate

√6 times faster

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

Interference of waves

All of these

Beats phenomena

Doppler effect

10. 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 not change

Time period will decrease

Time period will increase

Time period will depend on the weight of the boy.

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

In phase

None of these

Sometimes in phase

Out of phase

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

Becomes zero

Remains unchanged

Decreases

Increases

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

Moisture contents in air

The composition of air

The atmospheric pressure

Temperature of air

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

Sonic speed

Extra supersonic speed

Supersonic speed

None of these

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

90°

180°

120°

60°

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

Remains same

Increases

Decreases

Increases or decreases depending on the material

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

λ/2

2λ

λ/4

18. In stationary waves

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antidotes

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

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

There is a loss of energy

There is a gain of energy

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

∞ x²

∞ x

Independent of x

∞√x

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

1 second

π second

2π second

4π second

22. Fidelity refers to

Reproduction of music

Reproduction of original sound

Reproduction of original image

Reproduction of a CD from original copy

23. 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

24. The velocity of sound is greatest in

Water

Vacuum

Metal

Air

25. Beats are the results of

Destructive interference

Constrictive and destructive interference

Polarization

Diffraction of sound waves

Page 2 of 4

26. An oscillating mass-spring system generates

Periodic waves

Progressive waves

Mechanical waves

None of these

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

2 λ

3/2 λ

λ/2

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

Increased rapidly

Increased

Decreased

None of these

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

An apparent increase in frequency

An apparent decrease in wavelength

No apparent change in frequency

An apparent decrease in frequency

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

Energy

Energy and mass

Energy and linear momentum

Energy, momentum and mass

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

Interference

Beat phenomenon

Resonance

Doppler effect

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

Transverse wave

None of these

Progressive wave

Longitudinal waves

33. In simple harmonic motion,

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

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

34. The distance between node and antinode is

λ/2

2λ

λ/4

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

Interference

Refraction

Diffraction

Polarization

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

330

1000

156

37. In vibratory motion which parameter remains constant?

Total Energy

K.E. Energy

Angular Momentum

P.E. Energy

38. Energy is not carried by

Longitudinal vibration

Stationary waves

Transverse progressive waves

Electromagnetic waves

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

1.40

1.35

1.26

1.56

40. 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/2

T/8

T/12

T/4

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

Angular Motion

Circular Motion

Simple Harmonic Motion

Rectilinear Motion

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

Electromagnetic waves

Matter waves

Mechanical waves

Carrier waves

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

331 m/s

306 m/s

360 m/s

340 m/s

44. 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.

Has a definite quality

Can penetrate the wall

Has a definite pitch

Has a definite capacity

45. The speed of sound in a medium depends on

Neither the elastic property nor the inertia property

The inertia property but not on the elastic property

The elastic property but not on the inertia property

The elastic property as well as the inertia property

46. What sort of waves exhibit the Doppler effect?

Sound waves

Light waves

Water waves

All of these

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

Ultra-violet rays

Gamma rays

Infra-red radiation

Visible light

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

Wave

Reverberation

Oscillation Time

Time period

49. Velocity of sound in vacuum is

224 ms-1

332 ms-1

Zero

320 ms-1

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

262Hz

256Hz

7Hz

42Hz

Page 3 of 4

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

1343 ms¯¹

1214 ms¯¹

1483 ms¯¹

1567 ms¯¹

52. Silence zone takes place due to

Constructive interference

Resonance

Beats

Destructive interference

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

Zero in the mean position

None of these

Constant

Maximum in the extreme position

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

Pressure only

Both pressure and density

Neither pressure nor density

Density only

55. 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

4 s

2 s

3 s

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

2 : 1

4 : 1

1 : 2

1 : 4

57. 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)

√k₁k₂

(k₁+k₂)/2

k₁+k₂

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

Crossing mean position

Displacement is maximum

Half way between them

At rest

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

Optics

Wave mechanics

Statics

Acoustics

60. Sound waves in air always

Longitudinal

Transverse

Stationary

Electromagnetic

61. 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

Become infinite

Increase

Decrease

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

Half the mass

Double the mass

Reduce the mass to one fourth

Quadruple the mass

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

Frequency

Phase difference

Period

Wave length

64. Doppler-effect applies to

Both sound and light waves

Light wave only

Sound wave only

Neither sound nor light wave

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

Amplitude of motion will be every small

Amplitude of motion will be very large

None of these

Independent of amplitude of motion

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

Polarization

Reflection

Refraction

Diffraction

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

3,000 to 6,000 Hz

5,000 to 11,000 Hz

4,000 to 8,000 Hz

2,000 to 4,000 Hz

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

Increases

Decreases

Becomes Zero

Remains constant

69. The distance between node and anti-node is

2λ

λ/2

λ/4

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

Frequency and number of harmonic

Intensity and frequency

Intensity and velocity

Frequency and velocity

71. The Doppler effect is produced if

The detector is in motion

Both the above

None of these

The source is in motion

72. Sound waves do not travel in vacuum because

They do not have enough energy

They are stationary waves

They require material medium for propagation

They are transverse waves

73. 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

74. The velocity of sound in air depends upon

Amplitude and frequency of sound

Density and elasticity of gas

Wavelength of sound

Pressure

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

Longitudinal progressive

Transverse stationary

Transverse progressive

Longitudinal stationary

Page 4 of 4

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

Linear

Logarithmic

Exponential

Hyperbolic

77. 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

300 Nm¯¹

100 Nm¯¹

143 Nm¯¹

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

An ellipse

A straight line

A circle

A hyperbola

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

Cannot be diffracted

Have a lower frequency

Do not affect photographic plate

Cannot be polarized

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

66 m

33 m

16.5 m

10 m

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

Resonance

Oscillation

Damping

None of these

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

Interference

Refraction

Polarization

Reflection

83. 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

1.6 kg

12.6 kg

9.6 kg

84. Waves transmit _________ from one place to another

None of these

Energy

Mass

Both

85. 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 maximum, α is zero

When v is zero, α is zero

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

10 Hz

1 MHz

100000 Hz

1 GHz

87. For production of beats the two sources must have

Different frequencies and same phase

Different frequencies, same amplitude and same phase

Different frequencies

Different frequencies and same amplitude

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

Twice that of the individual waves

Same as that of the individual waves

Half that of the individual waves

√2 that of the individual waves

89. The gases have a

Smaller elastic modules

None of these

Zero elastic modulus

Large elastic modulus

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

Applied periodic force is small

Damping force is small

Quality factor is small

Restoring force is small

91. 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

3/32 m

32/3 m

3/2 m

92. 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

β – α

5 β – 4 α

9 (β – α)

93. Decibel is unit of

Intensity of light

x-ray radiation capacity

Sound loudness

Energy of radiation

94. A system under going force vibrations is known as

None

Vibration harmonic oscillator

Driven harmonic oscillator

Frequency harmonic oscillator

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Maan AliLast Updated: April 18, 2025

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10 Comments

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February 21, 2023 at 1:27 pm

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Yasir says:

August 28, 2020 at 11:39 pm

Q#3
Light wave is not a mechanical wave

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August 9, 2017 at 8:38 am

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July 5, 2017 at 1:59 am

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September 17, 2016 at 6:14 pm

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Physics Waves Online Test

Physics Waves MCQS Online Test

ECAT Physics Waves Chapter Online Test

Physics Waves Chapter Online Test

Physics

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Maan Ali

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Physics Waves MCQS Online Test

ECAT Physics Waves Chapter Online Test

Physics Waves Chapter Online Test

Physics

Related:

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Maan Ali

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