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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. A body with frequency f would complete one vibration in

1/T seconds

1 second

F seconds

1/f seconds

2. Decibel is unit of

x-ray radiation capacity

Intensity of light

Sound loudness

Energy of radiation

3. For production of beats the two sources must have

Different frequencies, same amplitude and same phase

Different frequencies and same amplitude

Different frequencies and same phase

Different frequencies

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

Quality factor is small

Applied periodic force is small

Restoring force is small

Damping force is small

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

Refraction

Diffraction

Polarization

Interference

6. 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

100 Nm¯¹

300 Nm¯¹

700 Nm¯¹

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

6 times faster

√6 times faster

At correct rate

√6 times slower

8. Beats are the results of

Constrictive and destructive interference

Destructive interference

Polarization

Diffraction of sound waves

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

Both pressure and density

Pressure only

Neither pressure nor density

Density only

10. 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 quality

Has a definite capacity

Can penetrate the wall

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

None of these

Supersonic speed

Extra supersonic speed

Sonic speed

12. An oscillating mass-spring system generates

Mechanical waves

Periodic waves

Progressive waves

None of these

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

Energy and mass

Energy, momentum and mass

Energy

Energy and linear momentum

14. 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:

1.6 kg

3.2 kg

9.6 kg

12.6 kg

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

Interference

Resonance

Doppler effect

Beat phenomenon

16. The Doppler effect is produced if

The source is in motion

Both the above

The detector is in motion

None of these

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

Acoustics

Optics

Statics

Wave mechanics

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

An apparent decrease in wavelength

An apparent decrease in frequency

No apparent change in frequency

An apparent increase in frequency

19. Fidelity refers to

Reproduction of music

Reproduction of a CD from original copy

Reproduction of original image

Reproduction of original sound

20. ‘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

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

2,000 to 4,000 Hz

4,000 to 8,000 Hz

5,000 to 11,000 Hz

3,000 to 6,000 Hz

22. 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

¼ sec

2 sec

½ sec

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

Becomes zero

Remains unchanged

Increases

Decreases

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

180°

90°

120°

60°

25. Sound waves in air always

Transverse

Electromagnetic

Stationary

Longitudinal

Page 2 of 4

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

None of these

Damping

Resonance

Oscillation

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

16.5 m

10 m

66 m

33 m

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

Linear

Logarithmic

Hyperbolic

Exponential

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

Beats phenomena

Interference of waves

Doppler effect

All of these

30. 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

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

2 λ

3/2 λ

λ/2

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

Increased rapidly

Decreased

Increased

None of these

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

Progressive wave

None of these

Transverse wave

Longitudinal waves

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

Becomes double

Becomes one half

Remains same

Become one fourth

35. In stationary waves

Energy is minimum at nodes and maximum at antinodes

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antidotes

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

Phase difference

Period

Frequency

Wave length

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

In phase

Sometimes in phase

Out of phase

None of these

38. 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

√k₁k₂

k₁+k₂

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

Longitudinal progressive

Transverse stationary

Longitudinal stationary

Transverse progressive

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

Amplitude

Frequency

Wavelength

None of these

41. Doppler-effect applies to

Both sound and light waves

Light wave only

Sound wave only

Neither sound nor light wave

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

Refraction

Polarization

Reflection

Interference

43. 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 gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

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

Increases

Remains same

Increases or decreases depending on the material

Decreases

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

Independent of x

∞ x

∞√x

∞ x²

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

Infra-red radiation

Ultra-violet rays

Visible light

Gamma rays

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

Constant

Zero in the mean position

None of these

Maximum in the extreme position

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

156

330

1000

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

Remains same

Increase

Decrease

Become zero

50. What sort of waves exhibit the Doppler effect?

All of these

Light waves

Sound waves

Water waves

Page 3 of 4

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

Reflection

Polarization

Diffraction

Refraction

52. 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

53. Silence zone takes place due to

Destructive interference

Beats

Resonance

Constructive interference

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

A straight line

A circle

A hyperbola

An ellipse

55. 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

3/32 m

3/2 m

2/3 m

32/3 m

56. 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

57. The distance between node and anti-node is

λ/4

λ/2

2λ

58. Sound waves do not travel in vacuum because

They do not have enough energy

They are transverse waves

They require material medium for propagation

They are stationary waves

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

None of these

Independent of amplitude of motion

Amplitude of motion will be every small

Amplitude of motion will be very large

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

Double the mass

Quadruple the mass

Reduce the mass to one fourth

Half the mass

61. A system under going force vibrations is known as

None

Driven harmonic oscillator

Frequency harmonic oscillator

Vibration harmonic oscillator

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

Half way between them

Crossing mean position

Displacement is maximum

At rest

63. 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 zero, α is zero

When v is maximum, α is maximum

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

64. 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

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

262Hz

7Hz

256Hz

42Hz

66. 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

67. The distance between node and antinode is

λ/2

λ/4

2λ

68. 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

Increase

Remain unaffected

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

Time period

Oscillation Time

Reverberation

Wave

70. 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

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

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

Rectilinear Motion

Simple Harmonic Motion

Circular Motion

Angular Motion

72. In vibratory motion which parameter remains constant?

Total Energy

P.E. Energy

Angular Momentum

K.E. Energy

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

100000 Hz

10 Hz

1 MHz

1 GHz

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

Mechanical waves

Matter waves

Carrier waves

Electromagnetic waves

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

Have a lower frequency

Cannot be polarized

Cannot be diffracted

Do not affect photographic plate

Page 4 of 4

76. In stationary waves

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is maximum at nodes and minimum at antidotes

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

360 m/s

331 m/s

306 m/s

340 m/s

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

1567 ms¯¹

1214 ms¯¹

1343 ms¯¹

1483 ms¯¹

79. The gases have a

None of these

Smaller elastic modules

Zero elastic modulus

Large elastic modulus

80. Velocity of sound in vacuum is

332 ms-1

Zero

320 ms-1

224 ms-1

81. Energy is not carried by

Electromagnetic waves

Transverse progressive waves

Longitudinal vibration

Stationary waves

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

1 second

2π second

4π second

π second

83. The velocity of sound in air depends upon

Density and elasticity of gas

Wavelength of sound

Amplitude and frequency of sound

Pressure

84. 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

5 β – 4 α

5α – 4β

9 (β – α)

β – α

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

Remains constant

Becomes Zero

Decreases

Increases

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

Moisture contents in air

Temperature of air

The atmospheric pressure

The composition of air

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

Intensity and frequency

Intensity and velocity

Frequency and velocity

Frequency and number of harmonic

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

λ/2

λ/4

2λ

89. The velocity of sound is greatest in

Vacuum

Water

Metal

Air

90. Waves transmit _________ from one place to another

Mass

None of these

Energy

Both

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

1 : 4

2 : 1

4 : 1

1 : 2

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

3 s

1 s

4 s

2 s

93. 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/2

T/4

T/8

94. 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

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Maan AliLast Updated: April 18, 2025

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10 Comments

TAYYABA KHALIQ says:

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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September 21, 2017 at 5:28 pm

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August 9, 2017 at 8:38 am

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July 21, 2017 at 3:12 pm

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  November 20, 2021 at 6:55 pm
  
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July 5, 2017 at 1:59 am

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September 17, 2016 at 6:14 pm

80% 🙂

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April 14, 2016 at 12:12 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

Related:

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Maan Ali

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