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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 length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

360 m/s

340 m/s

331 m/s

306 m/s

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

Double the mass

Half the mass

Quadruple the mass

Reduce the mass to one fourth

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

Amplitude of motion will be every small

None of these

Independent of amplitude of motion

Amplitude of motion will be very large

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

Sonic speed

Supersonic speed

Extra supersonic speed

None of these

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

1343 ms¯¹

1214 ms¯¹

1567 ms¯¹

1483 ms¯¹

6. Fidelity refers to

Reproduction of a CD from original copy

Reproduction of music

Reproduction of original sound

Reproduction of original image

7. Beats are the results of

Destructive interference

Polarization

Diffraction of sound waves

Constrictive and destructive interference

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

An ellipse

A straight line

A hyperbola

A circle

9. Two springs of spring constants k₁ and k₂ are joined in series. The effective spring constant of the combination is given by

k₁+k₂

√k₁k₂

k₁ k₂/( k₁+k₂)

(k₁+k₂)/2

10. The gases have a

Smaller elastic modules

Zero elastic modulus

Large elastic modulus

None of these

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

Statics

Wave mechanics

Acoustics

Optics

12. For production of beats the two sources must have

Different frequencies and same phase

Different frequencies, same amplitude and same phase

Different frequencies and same amplitude

Different frequencies

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

Resonance

Oscillation

Damping

None of these

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

Increases

Decreases

Remains unchanged

Becomes zero

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

Wavelength

Frequency

None of these

Amplitude

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

Constant

Maximum in the extreme position

Zero in the mean position

None of these

17. 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

β – α

9 (β – α)

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

λ/2

2 λ

3/2 λ

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

√6 times slower

6 times faster

At correct rate

√6 times faster

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

1000

156

330

21. 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

9.6 kg

1.6 kg

12.6 kg

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

Energy

Energy and linear momentum

Energy, momentum and mass

Energy and mass

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

Infra-red radiation

Ultra-violet rays

Visible light

Gamma rays

24. 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

32/3 m

3/2 m

25. The velocity of sound is greatest in

Air

Vacuum

Metal

Water

Page 2 of 4

26. Decibel is unit of

x-ray radiation capacity

Intensity of light

Energy of radiation

Sound loudness

27. 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 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

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

Both pressure and density

Pressure only

Neither pressure nor density

Density only

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

Transverse stationary

Transverse progressive

Longitudinal progressive

Longitudinal stationary

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

2λ

λ/2

λ/4

31. 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

1 s

2 s

3 s

4 s

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

Temperature of air

Moisture contents in air

The atmospheric pressure

The composition of air

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

Beats phenomena

Doppler effect

All of these

Interference of waves

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

Simple Harmonic Motion

Circular Motion

Angular Motion

Rectilinear Motion

35. In stationary waves

Energy is maximum at nodes and minimum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antinodes

Energy is uniformly distributed

36. Doppler-effect applies to

Light wave only

Neither sound nor light wave

Both sound and light waves

Sound wave only

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

Increased

None of these

Decreased

Increased rapidly

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

There is a gain 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 loss of energy

39. 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

40. What sort of waves exhibit the Doppler effect?

Light waves

All of these

Water waves

Sound waves

41. The Doppler effect is produced if

None of these

Both the above

The source is in motion

The detector is in motion

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

∞ x

Independent of x

∞√x

∞ x²

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

Refraction

Interference

Reflection

Polarization

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

42Hz

256Hz

262Hz

7Hz

45. A system under going force vibrations is known as

Frequency harmonic oscillator

Vibration harmonic oscillator

Driven harmonic oscillator

None

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

1/f seconds

1/T seconds

1 second

F seconds

47. 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.

Can penetrate the wall

Has a definite capacity

Has a definite pitch

Has a definite quality

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

Longitudinal waves

Progressive wave

None of these

Transverse wave

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

180°

120°

60°

90°

50. The velocity of sound in air depends upon

Density and elasticity of gas

Wavelength of sound

Amplitude and frequency of sound

Pressure

Page 3 of 4

51. Sound waves in air always

Longitudinal

Stationary

Electromagnetic

Transverse

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

10 Hz

1 MHz

100000 Hz

1 GHz

53. 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

54. Silence zone takes place due to

Beats

Destructive interference

Constructive interference

Resonance

55. Energy is not carried by

Longitudinal vibration

Electromagnetic waves

Transverse progressive waves

Stationary waves

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

1 : 4

4 : 1

1 : 2

2 : 1

57. 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

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

5,000 to 11,000 Hz

3,000 to 6,000 Hz

4,000 to 8,000 Hz

2,000 to 4,000 Hz

59. 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/12

T/2

60. Velocity of sound in vacuum is

332 ms-1

320 ms-1

224 ms-1

Zero

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

Diffraction

Interference

Refraction

Polarization

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

Decreases

Remains same

Increases

Increases or decreases depending on the material

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

Frequency and number of harmonic

Intensity and velocity

Intensity and frequency

Frequency and velocity

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

Resonance

Doppler effect

Beat phenomenon

Interference

65. An oscillating mass-spring system generates

Mechanical waves

Periodic waves

None of these

Progressive waves

66. 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

67. 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

6 m

36 m

1/6 m

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

4π second

2π second

1 second

π second

69. In vibratory motion which parameter remains constant?

Angular Momentum

Total Energy

P.E. Energy

K.E. Energy

70. 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

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

Period

Phase difference

Frequency

Wave length

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

Half way between them

At rest

Displacement is maximum

Crossing mean position

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

Hyperbolic

Logarithmic

Linear

Exponential

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

66 m

16.5 m

33 m

10 m

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

Damping force is small

Restoring force is small

Applied periodic force is small

Quality factor is small

Page 4 of 4

76. 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

(11/10)²

10/9

11/10

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

Remains same

Become one fourth

Becomes one half

Becomes double

78. In stationary waves

Energy is minimum at nodes and maximum at antidotes

Energy is uniformly distributed

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is minimum at nodes and maximum at antinodes

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

Wave

Oscillation Time

Time period

Reverberation

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

Polarization

Reflection

Refraction

Diffraction

81. If the period of oscillation of mass m suspended from a spring is one second, then the period of 4 m will be:

¼ sec

4 sec

½ sec

2 sec

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

Matter waves

Mechanical waves

Electromagnetic waves

Carrier waves

83. The speed of sound in a medium depends on

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

The inertia property but not on the elastic property

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

Become zero

Remains same

Increase

Decrease

85. 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 maximum

When v is zero, α is zero

When v is maximum, α is zero

86. Waves transmit _________ from one place to another

Mass

Energy

Both

None of these

87. The distance between node and anti-node is

λ/4

λ/2

2λ

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

None of these

In phase

Sometimes in phase

Out of phase

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

An apparent decrease in wavelength

No apparent change in frequency

An apparent increase in frequency

An apparent decrease in frequency

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

Increases

Remains constant

Decreases

Becomes Zero

91. 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

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

1.26

1.40

1.35

1.56

93. The distance between node and antinode is

2λ

λ/2

λ/4

94. 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

Remain unaffected

Become infinite

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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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