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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
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Waves Chapter Online Test

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Page 1 of 4

Physics

1. The gases have a

Zero elastic modulus

Large elastic modulus

None of these

Smaller elastic modules

2. An oscillating mass-spring system generates

Periodic waves

Progressive waves

None of these

Mechanical waves

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

Increases or decreases depending on the material

Increases

Remains same

Decreases

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

None of these

Amplitude

Wavelength

Frequency

5. 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

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

Transverse wave

Longitudinal waves

Progressive wave

None of these

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 zero

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

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

10 m

33 m

16.5 m

66 m

9. 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

10. 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

The energy is redistributed and the distribution remains constant with time

There is a loss of energy

11. The speed of sound in a medium depends on

The inertia property but not on the elastic property

The elastic property but not on the inertia property

Neither the elastic property nor the inertia property

The elastic property as well as the inertia property

12. 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

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

330

156

1000

14. 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

32/3 m

3/32 m

15. Waves transmit _________ from one place to another

Energy

None of these

Mass

Both

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

Intensity and velocity

Intensity and frequency

Frequency and velocity

Frequency and number of harmonic

17. In vibratory motion which parameter remains constant?

Total Energy

P.E. Energy

K.E. Energy

Angular Momentum

18. 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)

5 β – 4 α

β – α

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

Resonance

None of these

Damping

Oscillation

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

Mechanical waves

Matter waves

Carrier waves

Electromagnetic waves

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

λ/2

2 λ

3/2 λ

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

Pressure only

Density only

Neither pressure nor density

Both pressure and density

23. 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)²

10/9

(9/10)²

11/10

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

Amplitude of motion will be very large

None of these

Amplitude of motion will be every small

Independent of amplitude of motion

25. 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

Page 2 of 4

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

None of these

Maximum in the extreme position

Zero in the mean position

Constant

27. Sound waves in air always

Transverse

Electromagnetic

Longitudinal

Stationary

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

Decreased

None of these

Increased rapidly

Increased

29. 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

100 Nm¯¹

300 Nm¯¹

143 Nm¯¹

700 Nm¯¹

30. Decibel is unit of

x-ray radiation capacity

Energy of radiation

Intensity of light

Sound loudness

31. 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

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

Becomes double

Remains same

Becomes one half

Become one fourth

33. Sound waves do not travel in vacuum because

They do not have enough energy

They are transverse waves

They are stationary waves

They require material medium for propagation

34. Velocity of sound in vacuum is

320 ms-1

Zero

332 ms-1

224 ms-1

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

Statics

Acoustics

Wave mechanics

Optics

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

4 : 1

1 : 2

2 : 1

1 : 4

37. The velocity of sound in air depends upon

Density and elasticity of gas

Amplitude and frequency of sound

Wavelength of sound

Pressure

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

A hyperbola

A circle

A straight line

An ellipse

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

Twice that of the individual waves

Same as that of the individual waves

√2 that of the individual waves

Half that of the individual waves

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

Remains constant

Increases

Decreases

Becomes Zero

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

At rest

Displacement is maximum

Half way between them

Crossing mean position

42. 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 pitch

Has a definite capacity

Has a definite quality

Can penetrate the wall

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

Longitudinal progressive

Longitudinal stationary

Transverse stationary

Transverse progressive

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

Refraction

Reflection

Polarization

Diffraction

45. In stationary waves

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

Energy is maximum at nodes and minimum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

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

Polarization

Diffraction

Refraction

Interference

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

Resonance

Beat phenomenon

Doppler effect

Interference

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

1343 ms¯¹

1483 ms¯¹

1214 ms¯¹

1567 ms¯¹

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

Angular Motion

Simple Harmonic Motion

Rectilinear Motion

Circular Motion

50. What sort of waves exhibit the Doppler effect?

Sound waves

All of these

Light waves

Water waves

Page 3 of 4

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

∞√x

Independent of x

∞ x

∞ x²

52. Energy is not carried by

Transverse progressive waves

Longitudinal vibration

Stationary waves

Electromagnetic waves

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

√6 times slower

At correct rate

√6 times faster

6 times faster

54. For production of beats the two sources must have

Different frequencies and same phase

Different frequencies

Different frequencies and same amplitude

Different frequencies, same amplitude and same phase

55. In simple harmonic motion,

The velocity and acceleration 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 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

56. The velocity of sound is greatest in

Vacuum

Metal

Water

Air

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

120°

60°

90°

180°

58. ‘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

1.56

1.26

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

256Hz

42Hz

262Hz

7Hz

60. A system under going force vibrations is known as

Frequency harmonic oscillator

None

Driven harmonic oscillator

Vibration harmonic oscillator

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

Gamma rays

Ultra-violet rays

Infra-red radiation

Visible light

62. Fidelity refers to

Reproduction of original sound

Reproduction of music

Reproduction of original image

Reproduction of a CD from original copy

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

Wave length

Phase difference

Frequency

Period

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

λ/2

2λ

λ/4

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

½ sec

¼ sec

4 sec

2 sec

66. The distance between node and antinode is

λ/4

λ/2

2λ

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

Decreases

Increases

Remains unchanged

Becomes zero

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

Temperature of air

The composition of air

The atmospheric pressure

Moisture contents in air

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

1 second

F seconds

1/f seconds

1/T seconds

70. 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

Decrease

Increase

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

Time period

Wave

Reverberation

Oscillation Time

72. Doppler-effect applies to

Light wave only

Sound wave only

Neither sound nor light wave

Both sound and light waves

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

None of these

In phase

Out of phase

Sometimes in phase

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

Reduce the mass to one fourth

Half the mass

Quadruple the mass

Double the mass

75. Silence zone takes place due to

Destructive interference

Constructive interference

Resonance

Beats

Page 4 of 4

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

3,000 to 6,000 Hz

2,000 to 4,000 Hz

4,000 to 8,000 Hz

5,000 to 11,000 Hz

77. 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

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

1 second

π second

4π second

2π second

79. Beats are the results of

Constrictive and destructive interference

Diffraction of sound waves

Destructive interference

Polarization

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

Interference

Refraction

Reflection

Polarization

81. 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

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

Damping force is small

Applied periodic force is small

Quality factor is small

Restoring force is small

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

None of these

Sonic speed

Extra supersonic speed

Supersonic speed

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

Hyperbolic

Exponential

Linear

Logarithmic

85. 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:

9.6 kg

1.6 kg

12.6 kg

3.2 kg

86. 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

87. The Doppler effect is produced if

Both the above

The detector is in motion

None of these

The source is in motion

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 not change

Time period will depend on the weight of the boy.

Time period will increase

Time period will decrease

89. 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

90. 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/2

T/12

T/8

91. 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

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

No apparent change in frequency

An apparent decrease in frequency

An apparent decrease in wavelength

An apparent increase in frequency

93. In stationary waves

Energy is minimum at nodes and maximum at antidotes

Energy is uniformly distributed

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antinodes

94. The distance between node and anti-node is

λ/2

λ/4

2λ

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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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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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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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