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

Energy and mass

Energy and linear momentum

Energy, momentum and mass

Energy

2. In vibratory motion which parameter remains constant?

P.E. Energy

Total Energy

Angular Momentum

K.E. Energy

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

Moisture contents in air

The composition of air

Temperature of air

The atmospheric pressure

4. 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

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

Polarization

Refraction

Interference

Reflection

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

A straight line

An ellipse

A circle

A hyperbola

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 zero, α is zero

When v is maximum, α is maximum

When v is maximum, α is zero

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

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

Longitudinal waves

Transverse wave

None of these

Progressive wave

9. Beats are the results of

Constrictive and destructive interference

Destructive interference

Polarization

Diffraction of sound waves

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

Longitudinal progressive

Transverse stationary

Transverse progressive

Longitudinal stationary

11. 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

143 Nm¯¹

100 Nm¯¹

12. 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

11/10

(9/10)²

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

1 GHz

1 MHz

10 Hz

100000 Hz

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

Zero in the mean position

Constant

Maximum in the extreme position

None of these

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

Oscillation

None of these

Damping

Resonance

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

Reflection

Polarization

Refraction

Diffraction

17. The velocity of sound is greatest in

Vacuum

Air

Metal

Water

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

Sonic speed

Extra supersonic speed

Supersonic speed

None of these

19. A system under going force vibrations is known as

Vibration harmonic oscillator

Frequency harmonic oscillator

None

Driven harmonic oscillator

20. 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

21. In stationary waves

Energy is uniformly distributed

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antinodes

Energy is minimum at nodes and maximum at antidotes

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

3/2 λ

λ/2

2 λ

23. The speed of sound in a medium depends on

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

The elastic property but not on the inertia property

24. The velocity of sound in air depends upon

Wavelength of sound

Density and elasticity of gas

Pressure

Amplitude and frequency of sound

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

Becomes zero

Decreases

Remains unchanged

Increases

Page 2 of 4

26. 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

27. Energy is not carried by

Transverse progressive waves

Electromagnetic waves

Stationary waves

Longitudinal vibration

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

Doppler effect

Interference

Beat phenomenon

Resonance

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

Gamma rays

Infra-red radiation

Ultra-violet rays

Visible light

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

F seconds

1 second

1/T seconds

1/f seconds

31. Sound waves in air always

Electromagnetic

Transverse

Stationary

Longitudinal

32. 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

33. Velocity of sound in vacuum is

320 ms-1

224 ms-1

332 ms-1

Zero

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

Increases or decreases depending on the material

Increases

Decreases

Remains same

35. Waves transmit _________ from one place to another

Mass

Energy

None of these

Both

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

None of these

Increased

Decreased

Increased rapidly

37. Decibel is unit of

Intensity of light

Energy of radiation

Sound loudness

x-ray radiation capacity

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

Displacement is maximum

Half way between them

Crossing mean position

At rest

39. For production of beats the two sources must have

Different frequencies

Different frequencies and same phase

Different frequencies and same amplitude

Different frequencies, same amplitude and same phase

40. 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

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

Hyperbolic

Exponential

Linear

Logarithmic

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

Rectilinear Motion

Angular Motion

Circular Motion

Simple Harmonic Motion

43. An oscillating mass-spring system generates

Progressive waves

None of these

Periodic waves

Mechanical waves

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

Double the mass

Quadruple the mass

Half the mass

Reduce the mass to one fourth

45. 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

2/3 m

3/2 m

32/3 m

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

Frequency and number of harmonic

Frequency and velocity

Intensity and frequency

Intensity and velocity

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

Independent of amplitude of motion

None of these

Amplitude of motion will be very large

Amplitude of motion will be every small

48. The gases have a

Large elastic modulus

None of these

Smaller elastic modules

Zero elastic modulus

49. 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

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

∞ x²

Independent of x

∞ x

∞√x

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

Statics

Acoustics

Optics

Wave mechanics

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

4π second

2π second

π second

1 second

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

No apparent change in frequency

An apparent increase in frequency

An apparent decrease in frequency

An apparent decrease in wavelength

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

256Hz

262Hz

7Hz

42Hz

56. Silence zone takes place due to

Resonance

Constructive interference

Destructive interference

Beats

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

Becomes one half

Remains same

Become one fourth

Becomes double

58. 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

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

2λ

λ/2

λ/4

60. 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

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

Increases

Remains constant

Decreases

Becomes Zero

62. 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

63. In simple harmonic motion,

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

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

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

All of these

Interference of waves

Doppler effect

Beats phenomena

65. 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

√k₁/k₂

√k₂/k₁

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

1567 ms¯¹

1343 ms¯¹

1214 ms¯¹

1483 ms¯¹

67. Sound waves do not travel in vacuum because

They are transverse waves

They are stationary waves

They require material medium for propagation

They do not have enough energy

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

1000

330

156

69. The distance between node and antinode is

2λ

λ/4

λ/2

70. 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

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

180°

60°

120°

90°

72. What sort of waves exhibit the Doppler effect?

Water waves

All of these

Light waves

Sound waves

73. 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 decrease

Time period will depend on the weight of the boy.

Time period will increase

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

Refraction

Polarization

Diffraction

Interference

75. Doppler-effect applies to

Neither sound nor light wave

Light wave only

Sound wave only

Both sound and light waves

Page 4 of 4

76. Fidelity refers to

Reproduction of a CD from original copy

Reproduction of original sound

Reproduction of music

Reproduction of original image

77. 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:

1/36 m

1/6 m

36 m

6 m

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

Carrier waves

Electromagnetic waves

Matter waves

Mechanical waves

79. The distance between node and anti-node is

λ/2

λ/4

2λ

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

Reverberation

Wave

Time period

Oscillation Time

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

None of these

Sometimes in phase

In phase

Out of phase

82. The Doppler effect is produced if

Both the above

None of these

The source is in motion

The detector is in motion

83. 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

84. 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

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

Neither pressure nor density

Pressure only

Both pressure and density

Density only

86. 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/4

T/2

T/12

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

Cannot be polarized

Cannot be diffracted

Have a lower frequency

Do not affect photographic plate

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

Period

Phase difference

Wave length

Frequency

89. 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

90. 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

3 s

4 s

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

16.5 m

66 m

33 m

10 m

92. 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

Increase

Remain unaffected

Decrease

Become infinite

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

None of these

Frequency

Amplitude

Wavelength

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

1.40

1.56

1.26

1.35

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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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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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