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

Diffraction

Refraction

Polarization

Reflection

2. 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 quality

Has a definite pitch

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

306 m/s

331 m/s

360 m/s

340 m/s

4. The distance between node and antinode is

λ/4

λ/2

2λ

5. 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)/2

√k₁k₂

k₁ k₂/( k₁+k₂)

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

Damping

Resonance

None of these

Oscillation

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

Matter waves

Carrier waves

Electromagnetic waves

Mechanical waves

8. 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:

3.2 kg

1.6 kg

9.6 kg

12.6 kg

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

An apparent decrease in frequency

An apparent increase in frequency

An apparent decrease in wavelength

No apparent change in frequency

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

None of these

Increased

Decreased

Increased rapidly

11. The distance between node and anti-node is

λ/2

λ/4

2λ

12. 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

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

Applied periodic force is small

Damping force is small

Restoring force is small

Quality factor is small

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

Maximum in the extreme position

Constant

Zero in the mean position

None of these

15. 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

16. 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

4 s

3 s

1 s

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

Become one fourth

Remains same

Becomes double

Becomes one half

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

1 : 2

1 : 4

4 : 1

2 : 1

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

In phase

Sometimes in phase

None of these

Out of phase

20. 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:

1/6 m

6 m

1/36 m

36 m

21. 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

β – α

5 β – 4 α

9 (β – α)

22. Velocity of sound in vacuum is

Zero

320 ms-1

224 ms-1

332 ms-1

23. 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

Decrease

Increase

Remain unaffected

24. The gases have a

None of these

Smaller elastic modules

Zero elastic modulus

Large elastic modulus

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

√2 that of the individual waves

Half that of the individual waves

Twice that of the individual waves

Same as that of the individual waves

Page 2 of 4

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

Refraction

Diffraction

Interference

Polarization

27. Silence zone takes place due to

Destructive interference

Resonance

Beats

Constructive interference

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

At rest

Crossing mean position

Displacement is maximum

Half way between them

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

F seconds

1/f seconds

1/T seconds

1 second

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

The atmospheric pressure

Temperature of air

Moisture contents in air

The composition of air

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

Beat phenomenon

Doppler effect

Interference

Resonance

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

∞√x

Independent of x

∞ x

∞ x²

33. 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

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

3,000 to 6,000 Hz

2,000 to 4,000 Hz

4,000 to 8,000 Hz

5,000 to 11,000 Hz

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

1214 ms¯¹

1343 ms¯¹

1483 ms¯¹

1567 ms¯¹

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

16.5 m

33 m

10 m

66 m

37. 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

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

Progressive wave

Longitudinal waves

Transverse wave

None of these

39. 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°

40. Decibel is unit of

Intensity of light

Energy of radiation

Sound loudness

x-ray radiation capacity

41. 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 changes with time

The energy is redistributed and the distribution remains constant with time

42. 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

300 Nm¯¹

700 Nm¯¹

143 Nm¯¹

100 Nm¯¹

43. 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

Decrease

Become zero

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

Quadruple the mass

Reduce the mass to one fourth

Half the mass

Double the mass

45. Sound waves in air always

Transverse

Stationary

Longitudinal

Electromagnetic

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

A circle

A hyperbola

An ellipse

A straight line

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

1.40

1.35

1.26

1.56

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

Frequency

Wave length

Period

Phase difference

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

Interference of waves

Doppler effect

All of these

Beats phenomena

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

Pressure only

Neither pressure nor density

Both pressure and density

Density only

Page 3 of 4

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

Remains unchanged

Becomes zero

Increases

Decreases

52. 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 antinodes

Energy is minimum at nodes and maximum at antidotes

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

2λ

λ/2

λ/4

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

2 λ

λ/2

3/2 λ

55. Fidelity refers to

Reproduction of original image

Reproduction of a CD from original copy

Reproduction of original sound

Reproduction of music

56. Sound waves do not travel in vacuum because

They do not have enough energy

They are stationary waves

They are transverse waves

They require material medium for propagation

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

Refraction

Interference

Reflection

Polarization

58. What sort of waves exhibit the Doppler effect?

Water waves

Sound waves

Light waves

All of these

59. In vibratory motion which parameter remains constant?

Angular Momentum

P.E. Energy

Total Energy

K.E. Energy

60. The speed of sound in a medium depends on

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

The elastic property but not on the inertia property

61. Energy is not carried by

Longitudinal vibration

Transverse progressive waves

Stationary waves

Electromagnetic waves

62. In simple harmonic motion,

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

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

None of these

Frequency

Amplitude

Wavelength

64. 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

65. 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/8

T/4

T/12

66. The velocity of sound in air depends upon

Pressure

Density and elasticity of gas

Amplitude and frequency of sound

Wavelength of sound

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

Amplitude of motion will be every small

Amplitude of motion will be very large

None of these

Independent of amplitude of motion

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

Frequency and velocity

Intensity and frequency

Intensity and velocity

Frequency and number of harmonic

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

Longitudinal progressive

Longitudinal stationary

Transverse progressive

Transverse stationary

70. Beats are the results of

Constrictive and destructive interference

Diffraction of sound waves

Destructive interference

Polarization

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

Wave mechanics

Acoustics

Statics

Optics

72. The velocity of sound is greatest in

Water

Air

Metal

Vacuum

73. The Doppler effect is produced if

Both the above

None of these

The detector is in motion

The source is in motion

74. For production of beats the two sources must have

Different frequencies and same phase

Different frequencies

Different frequencies and same amplitude

Different frequencies, same amplitude and same phase

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

Becomes Zero

Remains constant

Decreases

Increases

Page 4 of 4

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

330

156

1000

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

Visible light

Infra-red radiation

Gamma rays

Ultra-violet rays

78. A sound source is moving towards stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is

(9/10)²

10/9

(11/10)²

11/10

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

2π second

4π second

π second

1 second

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

Energy, momentum and mass

Energy and linear momentum

Energy

Energy and mass

81. 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

3/32 m

2/3 m

3/2 m

82. A system under going force vibrations is known as

Vibration harmonic oscillator

Driven harmonic oscillator

None

Frequency harmonic oscillator

83. An oscillating mass-spring system generates

Mechanical waves

Progressive waves

None of these

Periodic waves

84. 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 antinodes

Energy is maximum at nodes and minimum at antidotes

85. Waves transmit _________ from one place to another

Both

None of these

Mass

Energy

86. Doppler-effect applies to

Neither sound nor light wave

Sound wave only

Both sound and light waves

Light wave only

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

Circular Motion

Rectilinear Motion

Simple Harmonic Motion

Angular Motion

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

Increases

Decreases

Remains same

Increases or decreases depending on the material

89. 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

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

7Hz

256Hz

262Hz

42Hz

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

Exponential

Linear

Logarithmic

Hyperbolic

92. 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 increase

Time period will decrease

Time period will depend on the weight of the boy.

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

Wave

Time period

Reverberation

Oscillation Time

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

Do not affect photographic plate

Cannot be polarized

Cannot be diffracted

Have a lower frequency

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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

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