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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 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 quality

Can penetrate the wall

Has a definite pitch

Has a definite capacity

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

A hyperbola

A circle

A straight line

An ellipse

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

Decreases

Becomes zero

Increases

Remains unchanged

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

In phase

None of these

Out of phase

Sometimes in phase

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

There is a loss of energy

There is a gain of energy

The energy is redistributed and the distribution remains constant with time

The energy is redistributed and the distribution changes with time

6. Silence zone takes place due to

Constructive interference

Beats

Destructive interference

Resonance

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

Doppler effect

Beats phenomena

Interference of waves

All of these

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

Angular Motion

Rectilinear Motion

Simple Harmonic Motion

Circular Motion

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

∞ x²

∞ x

∞√x

Independent of x

10. A system under going force vibrations is known as

Vibration harmonic oscillator

Driven harmonic oscillator

None

Frequency harmonic oscillator

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

None of these

Decreased

Increased

Increased rapidly

12. The Doppler effect is produced if

Both the above

The source is in motion

None of these

The detector is in motion

13. 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

2 sec

½ sec

14. 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

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

1 GHz

100000 Hz

1 MHz

10 Hz

16. The speed of sound in a medium depends on

Neither the elastic property nor the inertia property

The inertia property but not on the elastic property

The elastic property but not on the inertia property

The elastic property as well as the inertia property

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

Matter waves

Electromagnetic waves

Mechanical waves

Carrier waves

18. Sound waves in air always

Stationary

Transverse

Longitudinal

Electromagnetic

19. Beats are the results of

Diffraction of sound waves

Destructive interference

Constrictive and destructive interference

Polarization

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

Frequency

Amplitude

Wavelength

None of these

21. The distance between node and anti-node is

λ/2

λ/4

2λ

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

Visible light

Gamma rays

Ultra-violet rays

Infra-red radiation

23. In simple harmonic motion,

The velocity and acceleration 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 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

24. In vibratory motion which parameter remains constant?

Angular Momentum

Total Energy

P.E. Energy

K.E. Energy

25. For production of beats the two sources must have

Different frequencies and same phase

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same amplitude

Page 2 of 4

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

λ/4

2λ

λ/2

27. 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

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

Cannot be polarized

Have a lower frequency

Do not affect photographic plate

Cannot be diffracted

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

Reduce the mass to one fourth

Quadruple the mass

Half the mass

Double the mass

30. Decibel is unit of

Intensity of light

x-ray radiation capacity

Sound loudness

Energy of radiation

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

Half that of the individual waves

Twice that of the individual waves

√2 that of the individual waves

Same as that of the individual waves

32. 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

300 Nm¯¹

100 Nm¯¹

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

Wave mechanics

Acoustics

Optics

Statics

34. 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

32/3 m

3/2 m

2/3 m

35. Fidelity refers to

Reproduction of a CD from original copy

Reproduction of original sound

Reproduction of music

Reproduction of original image

36. Velocity of sound in vacuum is

224 ms-1

332 ms-1

320 ms-1

Zero

37. 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

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

λ/2

2 λ

3/2 λ

39. 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

(11/10)²

40. Waves transmit _________ from one place to another

Mass

Both

Energy

None of these

41. 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

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

Time period

Reverberation

Oscillation Time

Wave

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

None of these

Independent of amplitude of motion

Amplitude of motion will be very large

Amplitude of motion will be every small

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

(k₁+k₂)/2

k₁ k₂/( k₁+k₂)

k₁+k₂

√k₁k₂

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

None of these

Sonic speed

Extra supersonic speed

Supersonic speed

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

An apparent decrease in wavelength

An apparent increase in frequency

An apparent decrease in frequency

No apparent change in frequency

47. In stationary waves

Energy is minimum at nodes and maximum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

48. 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 decrease

Time period will depend on the weight of the boy.

Time period will not change

Time period will increase

49. In stationary waves

Energy is uniformly distributed

Energy is maximum at nodes and minimum at antidotes

Energy is minimum at nodes and maximum at antinodes

Alternating maximum and minimum energy producing at nodes and antinodes

50. 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

Page 3 of 4

51. Doppler-effect applies to

Light wave only

Both sound and light waves

Sound wave only

Neither sound nor light wave

52. 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 faster

√6 times slower

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

Increases

Increases or decreases depending on the material

Remains same

Decreases

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

Becomes double

Remains same

Becomes one half

Become one fourth

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

F seconds

1 second

1/T seconds

1/f seconds

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

4 : 1

1 : 2

2 : 1

1 : 4

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

4,000 to 8,000 Hz

5,000 to 11,000 Hz

2,000 to 4,000 Hz

3,000 to 6,000 Hz

58. Energy is not carried by

Transverse progressive waves

Stationary waves

Longitudinal vibration

Electromagnetic waves

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/4

T/12

T/2

T/8

60. The velocity of sound is greatest in

Water

Air

Vacuum

Metal

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

Reflection

Diffraction

Refraction

Polarization

62. ‘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

1.40

1.56

63. 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

Remain unaffected

Decrease

Increase

64. 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

65. What sort of waves exhibit the Doppler effect?

Light waves

Sound waves

Water waves

All of these

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

Phase difference

Frequency

Wave length

Period

67. 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

√k₂/k₁

√k₁/k₂

k₂/k₁

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

1483 ms¯¹

1343 ms¯¹

1567 ms¯¹

1214 ms¯¹

69. 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:

12.6 kg

9.6 kg

1.6 kg

3.2 kg

70. The gases have a

Zero elastic modulus

Large elastic modulus

None of these

Smaller elastic modules

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

Oscillation

Resonance

Damping

None of these

72. 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°

73. An oscillating mass-spring system generates

Periodic waves

None of these

Progressive waves

Mechanical waves

74. 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 zero, α is zero

When v is maximum, α is maximum

When v is maximum, α is zero

75. The distance between node and antinode is

λ/4

2λ

λ/2

Page 4 of 4

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

Intensity and velocity

Intensity and frequency

Frequency and velocity

Frequency and number of harmonic

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

156

330

1000

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

Decreases

Remains constant

Increases

Becomes Zero

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

At rest

Half way between them

Crossing mean position

Displacement is maximum

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

Linear

Logarithmic

Exponential

Hyperbolic

81. Sound waves do not travel in vacuum because

They do not have enough energy

They require material medium for propagation

They are stationary waves

They are transverse waves

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

None of these

Constant

Zero in the mean position

Maximum in the extreme position

83. 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

β – α

9 (β – α)

5 β – 4 α

5α – 4β

84. 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

340 m/s

331 m/s

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

33 m

16.5 m

66 m

10 m

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

Transverse stationary

Longitudinal progressive

Longitudinal stationary

Transverse progressive

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

Refraction

Interference

Reflection

Polarization

88. The velocity of sound in air depends upon

Density and elasticity of gas

Pressure

Amplitude and frequency of sound

Wavelength of sound

89. 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

2 s

3 s

1 s

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

Resonance

Interference

Doppler effect

Beat phenomenon

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

42Hz

262Hz

7Hz

256Hz

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

Remains same

Increase

Decrease

Become zero

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

Density only

Pressure only

Neither pressure nor density

Both pressure and density

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

Diffraction

Polarization

Refraction

Interference

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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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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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Maan Ali

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