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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 stationary waves

Energy is uniformly distributed

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antinodes

Energy is maximum at nodes and minimum at antidotes

2. The gases have a

Zero elastic modulus

Smaller elastic modules

Large elastic modulus

None of these

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

Becomes Zero

Decreases

Increases

Remains constant

4. 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

5. 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

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

A hyperbola

A straight line

A circle

An ellipse

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

1/T seconds

1/f seconds

F seconds

1 second

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

33 m

16.5 m

10 m

66 m

9. Sound waves in air always

Longitudinal

Transverse

Electromagnetic

Stationary

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

Half the mass

Quadruple the mass

Reduce the mass to one fourth

Double the mass

11. 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

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

Amplitude of motion will be every small

Independent of amplitude of motion

None of these

Amplitude of motion will be very large

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

Damping force is small

Applied periodic force is small

Restoring force is small

Quality factor is small

14. Fidelity refers to

Reproduction of a CD from original copy

Reproduction of original image

Reproduction of original sound

Reproduction of music

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

2λ

λ/2

λ/4

16. Velocity of sound in vacuum is

320 ms-1

Zero

224 ms-1

332 ms-1

17. In simple harmonic motion,

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

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

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

Become one fourth

Remains same

Becomes double

Becomes one half

19. Waves transmit _________ from one place to another

Both

Energy

None of these

Mass

20. 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

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

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

When v is maximum, α is maximum

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

Increased rapidly

Decreased

Increased

None of these

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

√k₁k₂

k₁ k₂/( k₁+k₂)

(k₁+k₂)/2

k₁+k₂

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

Linear

Hyperbolic

Exponential

Logarithmic

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

Energy and mass

Energy

Energy and linear momentum

Energy, momentum and mass

Page 2 of 4

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

Ultra-violet rays

Visible light

Gamma rays

Infra-red radiation

27. In vibratory motion which parameter remains constant?

P.E. Energy

Angular Momentum

Total Energy

K.E. Energy

28. 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

1/6 m

6 m

36 m

29. Doppler-effect applies to

Light wave only

Sound wave only

Both sound and light waves

Neither sound nor light wave

30. 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

100 Nm¯¹

700 Nm¯¹

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

1.35

1.26

1.56

1.40

32. 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

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

∞ x²

∞ x

Independent of x

∞√x

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

Out of phase

None of these

Sometimes in phase

In phase

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

1 MHz

1 GHz

100000 Hz

10 Hz

36. What sort of waves exhibit the Doppler effect?

Water waves

All of these

Sound waves

Light waves

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

1567 ms¯¹

1214 ms¯¹

1343 ms¯¹

1483 ms¯¹

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

The energy is redistributed and the distribution changes with time

There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution remains constant with time

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

Reflection

Refraction

Interference

Polarization

40. 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

3 s

1 s

4 s

2 s

41. For production of beats the two sources must have

Different frequencies, same amplitude and same phase

Different frequencies

Different frequencies and same amplitude

Different frequencies and same phase

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

Angular Motion

Simple Harmonic Motion

Rectilinear Motion

Circular Motion

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

1000

330

156

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

Become zero

Remains same

Increase

Decrease

45. 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

9 (β – α)

5α – 4β

β – α

5 β – 4 α

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

Interference

Beat phenomenon

Resonance

Doppler effect

47. Sound waves do not travel in vacuum because

They are transverse waves

They require material medium for propagation

They do not have enough energy

They are stationary waves

48. An oscillating mass-spring system generates

Periodic waves

None of these

Progressive waves

Mechanical waves

49. 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

Increase

Become infinite

Decrease

Remain unaffected

50. 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°

Page 3 of 4

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

Time period

Oscillation Time

Reverberation

Wave

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

Amplitude

Wavelength

None of these

Frequency

53. 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

54. Silence zone takes place due to

Destructive interference

Constructive interference

Beats

Resonance

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

Wave length

Phase difference

Period

Frequency

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

Pressure only

Both pressure and density

Density only

Neither pressure nor density

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

Remains unchanged

Decreases

Increases

Becomes zero

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

Longitudinal progressive

Transverse stationary

Transverse progressive

Longitudinal stationary

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

Optics

Wave mechanics

Acoustics

Statics

60. The distance between node and anti-node is

λ/4

2λ

λ/2

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

All of these

Doppler effect

Beats phenomena

Interference of waves

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

5,000 to 11,000 Hz

4,000 to 8,000 Hz

3,000 to 6,000 Hz

2,000 to 4,000 Hz

63. The Doppler effect is produced if

None of these

The detector is in motion

Both the above

The source is in motion

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

Cannot be diffracted

Do not affect photographic plate

Cannot be polarized

Have a lower frequency

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

Carrier waves

Electromagnetic waves

Mechanical waves

Matter waves

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

An apparent increase in frequency

An apparent decrease in frequency

No apparent change in frequency

An apparent decrease in wavelength

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

Same as that of the individual waves

√2 that of the individual waves

Half that of the individual waves

Twice that of the individual waves

68. 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 pitch

Has a definite capacity

Has a definite quality

69. 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

32/3 m

3/2 m

3/32 m

2/3 m

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

4π second

1 second

2π second

π second

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

Frequency and velocity

Frequency and number of harmonic

Intensity and velocity

Intensity and frequency

72. A system under going force vibrations is known as

Driven harmonic oscillator

Vibration harmonic oscillator

Frequency harmonic oscillator

None

73. The distance between node and antinode is

λ/4

2λ

λ/2

74. 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 decrease

Time period will not change

Time period will increase

Time period will depend on the weight of the boy.

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

None of these

Oscillation

Resonance

Damping

Page 4 of 4

76. 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

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

λ/2

2 λ

3/2 λ

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

Temperature of air

The atmospheric pressure

Moisture contents in air

The composition of air

79. 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/4

T/8

T/12

T/2

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

256Hz

42Hz

262Hz

7Hz

81. Beats are the results of

Polarization

Constrictive and destructive interference

Destructive interference

Diffraction of sound waves

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

None of these

Maximum in the extreme position

Constant

Zero in the mean position

83. 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

84. The velocity of sound in air depends upon

Amplitude and frequency of sound

Pressure

Wavelength of sound

Density and elasticity of gas

85. The velocity of sound is greatest in

Metal

Vacuum

Water

Air

86. Decibel is unit of

Intensity of light

x-ray radiation capacity

Energy of radiation

Sound loudness

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

Crossing mean position

Half way between them

At rest

Displacement is maximum

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

Reflection

Diffraction

Polarization

Refraction

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

√6 times slower

6 times faster

√6 times faster

At correct rate

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

Interference

Polarization

Diffraction

Refraction

91. The speed of sound in a medium depends on

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

The inertia property but not on the elastic property

92. Energy is not carried by

Transverse progressive waves

Stationary waves

Longitudinal vibration

Electromagnetic waves

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

1 : 4

4 : 1

2 : 1

1 : 2

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

Increases

Decreases

Increases or decreases depending on the material

Remains same

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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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July 5, 2017 at 1:59 am

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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

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Maan Ali

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