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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. When a stationary wave is formed then its frequency is

√2 that of the individual waves

Twice that of the individual waves

Same as that of the individual waves

Half that of the individual waves

2. Beats are the results of

Constrictive and destructive interference

Destructive interference

Diffraction of sound waves

Polarization

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

An apparent decrease in frequency

An apparent increase in frequency

No apparent change in frequency

An apparent decrease in wavelength

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

∞√x

Independent of x

∞ x

∞ x²

5. Fidelity refers to

Reproduction of original image

Reproduction of a CD from original copy

Reproduction of original sound

Reproduction of music

6. In simple harmonic motion,

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

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

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

Applied periodic force is small

Quality factor is small

Damping force is small

Restoring force is small

8. In stationary waves

Energy is minimum at nodes and maximum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

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

Angular Motion

Circular Motion

Rectilinear Motion

Simple Harmonic Motion

10. 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)/2

k₁+k₂

√k₁k₂

11. A system under going force vibrations is known as

None

Driven harmonic oscillator

Vibration harmonic oscillator

Frequency harmonic oscillator

12. Sound waves do not travel in vacuum because

They are stationary waves

They do not have enough energy

They are transverse waves

They require material medium for propagation

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

Half way between them

Crossing mean position

Displacement is maximum

At rest

14. 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

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

Refraction

Diffraction

Interference

Polarization

16. Doppler-effect applies to

Sound wave only

Both sound and light waves

Light wave only

Neither sound nor light wave

17. Velocity of sound in vacuum is

Zero

332 ms-1

320 ms-1

224 ms-1

18. 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:

12.6 kg

9.6 kg

3.2 kg

1.6 kg

19. The distance between node and anti-node is

λ/2

λ/4

2λ

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

16.5 m

10 m

33 m

66 m

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

Doppler effect

Interference of waves

All of these

Beats phenomena

22. Waves transmit _________ from one place to another

Both

Mass

None of these

Energy

23. 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 capacity

Can penetrate the wall

Has a definite pitch

Has a definite quality

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

Remains constant

Decreases

Increases

Becomes Zero

25. 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/12

T/8

T/4

Page 2 of 4

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

Density only

Neither pressure nor density

Both pressure and density

Pressure only

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

Damping

Oscillation

Resonance

None of these

28. 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

306 m/s

360 m/s

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

Oscillation Time

Time period

Reverberation

Wave

30. 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

31. 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

Become infinite

Remain unaffected

Decrease

Increase

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

Refraction

Reflection

Interference

Polarization

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

1 : 2

4 : 1

1 : 4

2 : 1

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

Amplitude of motion will be every small

Independent of amplitude of motion

Amplitude of motion will be very large

None of these

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

Have a lower frequency

Cannot be polarized

Do not affect photographic plate

Cannot be diffracted

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

1483 ms¯¹

1214 ms¯¹

1567 ms¯¹

1343 ms¯¹

37. 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

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

Remains same

Become one fourth

Becomes one half

Becomes double

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

Constant

Maximum in the extreme position

Zero in the mean position

None of these

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

Remains same

Increases

Increases or decreases depending on the material

Decreases

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

Frequency

Amplitude

Wavelength

None of these

42. 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 increase

Time period will decrease

43. 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

143 Nm¯¹

300 Nm¯¹

100 Nm¯¹

700 Nm¯¹

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

Increased rapidly

None of these

Increased

Decreased

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

Doppler effect

Beat phenomenon

Interference

Resonance

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

Frequency and velocity

Intensity and velocity

Frequency and number of harmonic

Intensity and frequency

47. 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

6 m

1/36 m

1/6 m

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

Phase difference

Period

Wave length

Frequency

49. Silence zone takes place due to

Beats

Destructive interference

Resonance

Constructive interference

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

There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution remains constant with time

The energy is redistributed and the distribution changes with time

Page 3 of 4

51. 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

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

Decreases

Increases

Becomes zero

Remains unchanged

53. 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

√k₁/k₂

√k₂/k₁

k₂/k₁

54. Sound waves in air always

Transverse

Electromagnetic

Longitudinal

Stationary

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

Supersonic speed

Extra supersonic speed

None of these

Sonic speed

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

60°

120°

90°

180°

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

Decrease

Remains same

Increase

Become zero

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

None of these

Out of phase

In phase

Sometimes in phase

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

Moisture contents in air

The atmospheric pressure

The composition of air

Temperature of air

60. In vibratory motion which parameter remains constant?

P.E. Energy

Total Energy

K.E. Energy

Angular Momentum

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

1/f seconds

1/T seconds

1 second

F seconds

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

Electromagnetic waves

Carrier waves

Matter waves

Mechanical waves

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

None of these

Progressive wave

Transverse wave

Longitudinal waves

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

Longitudinal progressive

Transverse progressive

Longitudinal stationary

Transverse stationary

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

42Hz

7Hz

262Hz

256Hz

66. The speed of sound in a medium depends on

The elastic property but not on the inertia property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

The inertia property but not on the elastic property

67. 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

When v is zero, α is zero

When v is maximum, α is zero

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

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

λ/2

λ/4

2λ

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

Quadruple the mass

Double the mass

Reduce the mass to one fourth

Half the mass

70. Energy is not carried by

Longitudinal vibration

Stationary waves

Transverse progressive waves

Electromagnetic waves

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

Energy

Energy and linear momentum

Energy and mass

Energy, momentum and mass

72. 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

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

1000

156

330

74. The velocity of sound is greatest in

Vacuum

Air

Metal

Water

75. The velocity of sound in air depends upon

Pressure

Wavelength of sound

Amplitude and frequency of sound

Density and elasticity of gas

Page 4 of 4

76. The Doppler effect is produced if

The source is in motion

The detector is in motion

Both the above

None of these

77. What sort of waves exhibit the Doppler effect?

Light waves

Water waves

All of these

Sound waves

78. 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

79. Decibel is unit of

Intensity of light

Sound loudness

x-ray radiation capacity

Energy of radiation

80. The distance between node and antinode is

2λ

λ/4

λ/2

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

A straight line

A hyperbola

A circle

An ellipse

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

Gamma rays

Infra-red radiation

Visible light

Ultra-violet rays

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

1.56

1.35

1.40

1.26

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

Refraction

Reflection

Diffraction

Polarization

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

Hyperbolic

Logarithmic

Linear

Exponential

86. 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

½ sec

2 sec

¼ sec

87. An oscillating mass-spring system generates

Periodic waves

Mechanical waves

Progressive waves

None of these

88. In stationary waves

Energy is maximum at nodes and minimum 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

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

Acoustics

Wave mechanics

Optics

Statics

90. The gases have a

None of these

Smaller elastic modules

Zero elastic modulus

Large elastic modulus

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

1 MHz

100000 Hz

1 GHz

10 Hz

92. 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

4 s

3 s

1 s

2 s

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

3/2 λ

2 λ

λ/2

94. 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

(9/10)²

11/10

(11/10)²

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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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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

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