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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. For production of beats the two sources must have

Different frequencies

Different frequencies and same phase

Different frequencies, same amplitude and same phase

Different frequencies and same amplitude

2. 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

9.6 kg

3.2 kg

12.6 kg

3. 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)

5 β – 4 α

β – α

5α – 4β

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

Beats phenomena

All of these

Doppler effect

Interference of waves

5. Decibel is unit of

Energy of radiation

Sound loudness

x-ray radiation capacity

Intensity of light

6. 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

√k₁/k₂

k₂/k₁

k₁/k₂

7. The distance between node and anti-node is

2λ

λ/4

λ/2

8. In stationary waves

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antidotes

Energy is minimum at nodes and maximum at antinodes

9. Silence zone takes place due to

Resonance

Destructive interference

Constructive interference

Beats

10. The gases have a

Large elastic modulus

Smaller elastic modules

None of these

Zero elastic modulus

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

Energy

Energy, momentum and mass

Energy and mass

Energy and linear momentum

12. In stationary waves

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is maximum at nodes and minimum at antidotes

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

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

Become one fourth

Becomes one half

Remains same

Becomes double

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

Remains constant

Decreases

Increases

Becomes Zero

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

Reverberation

Oscillation Time

Wave

Time period

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

None of these

Wavelength

Frequency

Amplitude

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

Diffraction

Reflection

Polarization

Refraction

18. 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

1/6 m

1/36 m

36 m

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

Cannot be diffracted

Do not affect photographic plate

Have a lower frequency

Cannot be polarized

20. 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

Has a definite quality

Has a definite pitch

Can penetrate the wall

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

Decreases

Increases or decreases depending on the material

Remains same

Increases

22. 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

(k₁+k₂)/2

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

Increased

Decreased

Increased rapidly

None of these

24. The velocity of sound is greatest in

Metal

Vacuum

Air

Water

25. The Doppler effect is produced if

The source is in motion

Both the above

None of these

The detector is in motion

Page 2 of 4

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

Resonance

None of these

Oscillation

Damping

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

Angular Motion

Circular Motion

Rectilinear Motion

Simple Harmonic Motion

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

Reflection

Polarization

Refraction

Interference

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

Beat phenomenon

Doppler effect

Interference

Resonance

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

2 λ

3/2 λ

λ/2

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

Mechanical waves

Carrier waves

Electromagnetic waves

Matter waves

32. Waves transmit _________ from one place to another

None of these

Energy

Mass

Both

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

F seconds

1/T seconds

1 second

1/f seconds

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

Maximum in the extreme position

Zero in the mean position

Constant

None of these

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

∞ x

Independent of x

∞√x

∞ x²

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

Interference

Refraction

Diffraction

Polarization

37. 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

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

Ultra-violet rays

Visible light

Gamma rays

Infra-red radiation

39. Sound waves do not travel in vacuum because

They do not have enough energy

They require material medium for propagation

They are transverse waves

They are stationary waves

40. Energy is not carried by

Stationary waves

Electromagnetic waves

Longitudinal vibration

Transverse progressive waves

41. The velocity of sound in air depends upon

Density and elasticity of gas

Wavelength of sound

Amplitude and frequency of sound

Pressure

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

The composition of air

The atmospheric pressure

Temperature of air

Moisture contents in air

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

Both pressure and density

Pressure only

Neither pressure nor density

Density only

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

No apparent change in frequency

An apparent decrease in wavelength

An apparent decrease in frequency

An apparent increase in frequency

45. 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°

46. 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

32/3 m

3/32 m

3/2 m

47. 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

2 s

1 s

4 s

3 s

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

Period

Frequency

Phase difference

Wave length

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

Twice that of the individual waves

Half that of the individual waves

√2 that of the individual waves

Same as that of the individual waves

50. Doppler-effect applies to

Light wave only

Both sound and light waves

Neither sound nor light wave

Sound wave only

Page 3 of 4

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

Half way between them

Crossing mean position

Displacement is maximum

At rest

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

Statics

Acoustics

Optics

Wave mechanics

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

1 : 2

1 : 4

2 : 1

4 : 1

54. 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

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

At correct rate

6 times faster

√6 times slower

√6 times faster

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

10 Hz

1 GHz

1 MHz

100000 Hz

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

256Hz

42Hz

262Hz

7Hz

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

2π second

1 second

π second

4π second

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

Frequency and velocity

Intensity and frequency

Intensity and velocity

Frequency and number of harmonic

60. The speed of sound in a medium depends on

The elastic property but not on the inertia property

The inertia property but not on the elastic property

Neither the elastic property nor the inertia property

The elastic property as well as the inertia property

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

1214 ms¯¹

1567 ms¯¹

1343 ms¯¹

1483 ms¯¹

62. In vibratory motion which parameter remains constant?

Angular Momentum

K.E. Energy

P.E. Energy

Total Energy

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

66 m

16.5 m

10 m

33 m

64. 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 acceleration of the vibrating particle is ahead of displacement by a phase of π

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

65. Sound waves in air always

Transverse

Stationary

Electromagnetic

Longitudinal

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

5,000 to 11,000 Hz

4,000 to 8,000 Hz

2,000 to 4,000 Hz

3,000 to 6,000 Hz

67. What sort of waves exhibit the Doppler effect?

Water waves

All of these

Sound waves

Light waves

68. A system under going force vibrations is known as

Driven harmonic oscillator

Frequency harmonic oscillator

None

Vibration harmonic oscillator

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

306 m/s

360 m/s

331 m/s

340 m/s

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

2λ

λ/4

λ/2

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

Sonic speed

Supersonic speed

None of these

Extra supersonic speed

72. The distance between node and antinode is

λ/2

λ/4

2λ

73. 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

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

Increase

Remains same

Become zero

Decrease

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

Decreases

Increases

Remains unchanged

Becomes zero

Page 4 of 4

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

156

1000

330

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

Half the mass

Double the mass

Quadruple the mass

Reduce the mass to one fourth

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

Quality factor is small

Damping force is small

Restoring force is small

Applied periodic force is small

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

Transverse stationary

Longitudinal progressive

Longitudinal stationary

Transverse progressive

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

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

There is a gain of energy

81. Velocity of sound in vacuum is

Zero

332 ms-1

320 ms-1

224 ms-1

82. An oscillating mass-spring system generates

Periodic waves

Mechanical waves

None of these

Progressive waves

83. 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

2 sec

¼ sec

4 sec

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

Out of phase

None of these

Sometimes in phase

In phase

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

1.26

1.35

1.56

1.40

86. 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

(11/10)²

(9/10)²

11/10

87. 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/8

T/12

T/4

T/2

88. 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

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

None of these

Amplitude of motion will be every small

Amplitude of motion will be very large

Independent of amplitude of motion

90. Fidelity refers to

Reproduction of music

Reproduction of original image

Reproduction of a CD from original copy

Reproduction of original sound

91. 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

92. Beats are the results of

Constrictive and destructive interference

Diffraction of sound waves

Destructive interference

Polarization

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

Linear

Exponential

Logarithmic

Hyperbolic

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

A hyperbola

An ellipse

A circle

A straight line

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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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July 21, 2017 at 3:10 pm

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1. waqas ali says:
  
  November 20, 2021 at 6:55 pm
  
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hafiz mubashir ali says:

July 5, 2017 at 1:59 am

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Zeeshan says:

September 17, 2016 at 6:14 pm

80% 🙂

aleena Khann says:

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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