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

90°

180°

60°

120°

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

Period

Phase difference

Frequency

Wave length

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

Simple Harmonic Motion

Rectilinear Motion

Angular Motion

Circular Motion

4. 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

9 (β – α)

β – α

5α – 4β

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

Increased rapidly

Increased

Decreased

None of these

6. Silence zone takes place due to

Destructive interference

Resonance

Constructive interference

Beats

7. 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)/2

k₁ k₂/( k₁+k₂)

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

1343 ms¯¹

1567 ms¯¹

1483 ms¯¹

1214 ms¯¹

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

Becomes zero

Decreases

Remains unchanged

Increases

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

Gamma rays

Ultra-violet rays

Infra-red radiation

Visible light

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

Polarization

Refraction

Diffraction

Reflection

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

None of these

Extra supersonic speed

Supersonic speed

Sonic speed

13. 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

12.6 kg

3.2 kg

1.6 kg

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

Frequency

Amplitude

None of these

Wavelength

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

π second

1 second

4π second

2π second

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

Independent of x

∞ x²

∞ x

∞√x

17. Fidelity refers to

Reproduction of a CD from original copy

Reproduction of original sound

Reproduction of original image

Reproduction of music

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

3,000 to 6,000 Hz

5,000 to 11,000 Hz

2,000 to 4,000 Hz

4,000 to 8,000 Hz

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

Logarithmic

Hyperbolic

Linear

Exponential

20. 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

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

λ/2

2λ

λ/4

23. In stationary waves

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is maximum at nodes and minimum at antidotes

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

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

Statics

Acoustics

Wave mechanics

Optics

25. 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

Page 2 of 4

26. 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

700 Nm¯¹

100 Nm¯¹

300 Nm¯¹

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

An ellipse

A hyperbola

A circle

A straight line

28. What sort of waves exhibit the Doppler effect?

Water waves

All of these

Light waves

Sound waves

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

Remains same

Increases

Decreases

Increases or decreases depending on the material

30. In vibratory motion which parameter remains constant?

Angular Momentum

K.E. Energy

P.E. Energy

Total Energy

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

None of these

Resonance

Damping

Oscillation

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

Moisture contents in air

The atmospheric pressure

Temperature of air

The composition of air

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

Both pressure and density

Density only

Pressure only

Neither pressure nor density

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

Increases

Remains constant

Becomes Zero

Decreases

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

Interference

Beat phenomenon

Resonance

Doppler effect

36. 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

Increase

Become infinite

Remain unaffected

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

Doppler effect

All of these

Interference of waves

Beats phenomena

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

Reverberation

Time period

Oscillation Time

Wave

39. 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

½ sec

¼ sec

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

1 MHz

10 Hz

1 GHz

100000 Hz

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

Independent of amplitude of motion

Amplitude of motion will be very large

None of these

Amplitude of motion will be every small

42. The gases have a

Smaller elastic modules

Zero elastic modulus

Large elastic modulus

None of these

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

In phase

Out of phase

Sometimes in phase

None of these

44. Sound waves in air always

Stationary

Transverse

Longitudinal

Electromagnetic

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

Interference

Polarization

Refraction

Diffraction

46. 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

47. Waves transmit _________ from one place to another

Both

Mass

None of these

Energy

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

Zero in the mean position

None of these

Maximum in the extreme position

Constant

49. Velocity of sound in vacuum is

224 ms-1

332 ms-1

320 ms-1

Zero

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

An apparent increase in frequency

An apparent decrease in wavelength

No apparent change in frequency

An apparent decrease in frequency

Page 3 of 4

51. 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 not change

Time period will decrease

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

Reflection

Polarization

Interference

Refraction

53. 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

36 m

1/36 m

1/6 m

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

3/2 λ

λ/2

2 λ

55. 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/8

T/12

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:

k₂/k₁

√k₁/k₂

√k₂/k₁

k₁/k₂

57. 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

58. 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

59. 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

1 s

2 s

3 s

60. For production of beats the two sources must have

Different frequencies and same amplitude

Different frequencies

Different frequencies and same phase

Different frequencies, same amplitude and same phase

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

Crossing mean position

At rest

Displacement is maximum

Half way between them

62. ‘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

63. An oscillating mass-spring system generates

None of these

Progressive waves

Mechanical waves

Periodic waves

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

2 : 1

1 : 2

4 : 1

1 : 4

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

256Hz

262Hz

42Hz

7Hz

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

Matter waves

Electromagnetic waves

Mechanical waves

Carrier waves

67. A system under going force vibrations is known as

Driven harmonic oscillator

Frequency harmonic oscillator

None

Vibration harmonic oscillator

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

Transverse progressive

Longitudinal progressive

Transverse stationary

Longitudinal stationary

69. Doppler-effect applies to

Neither sound nor light wave

Sound wave only

Both sound and light waves

Light wave only

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

Becomes one half

Becomes double

Remains same

Become one fourth

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

Quality factor is small

Restoring force is small

Applied periodic force is small

Damping force is small

72. Sound waves do not travel in vacuum because

They are stationary waves

They require material medium for propagation

They are transverse waves

They do not have enough energy

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

Increase

Decrease

Remains same

Become zero

74. In simple harmonic motion,

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

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

75. The Doppler effect is produced if

None of these

The detector is in motion

The source is in motion

Both the above

Page 4 of 4

76. The velocity of sound in air depends upon

Wavelength of sound

Amplitude and frequency of sound

Density and elasticity of gas

Pressure

77. 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

Can penetrate the wall

Has a definite quality

Has a definite capacity

78. The distance between node and antinode is

λ/2

2λ

λ/4

79. The velocity of sound is greatest in

Vacuum

Air

Metal

Water

80. 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

340 m/s

306 m/s

81. 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

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

Intensity and velocity

Frequency and velocity

Frequency and number of harmonic

Intensity and frequency

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

10 m

33 m

16.5 m

66 m

84. 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 minimum at nodes and maximum at antidotes

85. The distance between node and anti-node is

λ/4

λ/2

2λ

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

Do not affect photographic plate

Cannot be polarized

Have a lower frequency

Cannot be diffracted

87. 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

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

1 second

F seconds

1/T seconds

1/f seconds

89. Decibel is unit of

x-ray radiation capacity

Intensity of light

Sound loudness

Energy of radiation

90. Energy is not carried by

Transverse progressive waves

Stationary waves

Longitudinal vibration

Electromagnetic waves

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

Quadruple the mass

Double the mass

Half the mass

Reduce the mass to one fourth

92. Beats are the results of

Diffraction of sound waves

Destructive interference

Polarization

Constrictive and destructive interference

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

1000

156

330

94. 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

2/3 m

3/32 m

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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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  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

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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

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