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ECAT Physics Oscillations Test Online

Maan AliLast Updated: April 18, 2025

Physics Oscillations MCQS Online Test

ECAT Physics Oscillations Chapter Online Test

Total Questions:	87
Time Allowed:	40 Minutes
Total Marks:	87
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Oscillations Chapter Online Test

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Page 1 of 4

Physics

1. The energy of the oscillation comes from the

None of these

Applied force

Starting source

Driving source

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

3/2 λ

2λ

λ/2

3. Forced vibration are known as

Simple harmonic vibration

Driven harmonic vibration

Natural vibration

Free vibration

4. Oscillatory motion is a type of motion which is

Vibratory motion

Periodic motions

All of these

To and fro

5. The effective component of Vp or the velocity of the particle is given by

X₀ ω cos θ

Vp cos θ

All of these

Vp sin (90° - θ)

6. A simple pendulum is defined as

All of these

Light inextensible string

Friction less support

Small heavy mass

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

4π second

π second

2π second

1 second

8. A simple harmonic motion in which the

All of these

Acceleration produced is due to restoring force

Acceleration is directly proportional to displacement

Acceleration is directed towards the mean position

9. Identify the exact statement among the following:

The greater the mass of pendulum bob, the shorter is its frequency of oscillation

A simple pendulum with a bob of mass M swings with an angular amplitude of 40°. When its angular amplitude is 20°, the tension in the string is less than Mg cos 20°.

The fractional change in the time period of a pendulum on changing the temperature is independent of the length of the pendulum.

As the length of a simple pendulum is increased, the maximum velocity of its bob during its oscillation will also increase

10. A driven harmonic oscillator is the device in which, a physical system undergoes

Powerful vibration

None of these

Free vibrations

Forced vibration

11. For a simple pendulum the restoring force is caused by

All of these

Spring

Hand

Gravity

12. 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

Become infinite

Remain unaffected

Increase

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

Damping

Oscillation

Resonance

None

14. At the frequency of 2450 MHz, the waves are absorbed due to resonance by

All of these

Fat molecules

Both

Water molecules

15. If the length of the pendulum becomes four times, its time period will become

Nine times

Twice

Four times

Three times

16. Which one of the following is a simple harmonic motion?

Wave moving through a string fixed at both ends.

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed.

17. The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body?

15 cm

7.5 cm

10 cm

5 cm

18. The type of motion in which an oscillating disturbance is transmitted from one position to the next without the actual rectilinear translation of the particles of the medium is called

Wave motion

Rectilinear motion

Rotatory motion

Periodic motion

19. The body oscillates due to a

Restoring force

None of these

Applied force

Frictional force

20. 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 decrease

Time period will depend on the weight of the boy.

Time period will not change

21. The product of frequency and time period is equal to

22. A pendulum clock set to give correct time in Karachi is taken to Quetta. It would give correct time if

The mass of the pendulum is decreased

The length of the pendulum is decreased

The mass of the pendulum is increased

The length of the pendulum is increased

23. When a body movies in a circle, its projection performs what type of motion?

Rectilinear Motion

Circular Motion

Angular Motion

Simple Harmonic Motion

24. Phenomenon of resonance is very often employed to determine the

Wavelength of the various bodies

Amplitudes of the various bodies

Wavelength of the various bodies

None of these

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

Decreases

Remains constant

Increases

Becomes zero

Page 2 of 4

26. One vibration means, the motion of mass from its

Means position to upper extreme position

All of these

From means position to back to its means position

From extreme position

27. The waves produced in microwave oven have a wavelength

12cm

11cm

11.5cm

10cm

28. S.I unit of frequency is

Radian

Vibration S¯²

Hertz

ms¯¹

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

λ/2

2 λ

3/2 λ

30. Total distance traveled by bob of simple pendulum in one vibration is equal to

Square of amplitude

4 x amplitude

2 x amplitude

Amplitude

31. In simple harmonic motion

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 if the vibrating particle are in the same phase

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

32. Simple harmonic motion is defined as the motion of a particle such that

Its displacement x is always given by the expression x = x₀ sin ωt.

Its acceleration is proportional to, and in the opposite direction to, the displacement

Its acceleration is always ω²x₀ and its directed at right angles to its motion

Its displacement x is related to its velocity b by the expression v = ωt.

33. The damping depends upon

Amplitude

Sharpness

None of these

Both

34. Restoring force is defined as

F = ½ kx

F = ma

F = kx

F = -kx

35. In vibratory motion which parameter remains constant?

Total Energy

Angular Momentum

K.E. Energy

P.E. Energy

36. A pendulum clock set to give correct time in Karachi is taken to Quetta. It would give correct time if

The length of the pendulum is increased

The mass of the pendulum is increased

The mass of the pendulum is decreased

The length of the pendulum is decreased

37. The energy absorbed by a body is _________ at resonance.

Zero

Minimum only

Maximum only

Maximum as well minimum

38. The speed of a particle executing SHM along a circular path is given by the relation

None of these

V = √r² – x²

V = r² – x²

V = ω√r² – x²

39. 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

1 s

3 s

40. In energy conservation, when spring is stretched slowly so that acceleration is

None of these

Minimum

Zero

Maximum

41. The potential energy of a spring executing SHM is given by the

Kx²

½ Kx

½ Kx²

42. If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

1 s

3 s

4 s

2 s

43. The work done is stretching spring appears as elastic potential energy of the spring is

P.E. = ½ KX²

None of these

P.E. = ½ KX₀²

P.E. = ½ K²X²

44. In vibratory motion

Total momentum remain constant

P.E. remains constant

Total energy remain constant

K.E. remain constant

45. In case of a simple pendulum the cause of damping is

Tension is string

Drag force of air

Gravity

None of these

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

Double the mass

Quadruple the mass

Reduce the mass to one fourth

Half the mass

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

∞ √x

∞ x

∞ x²

Independent of x

48. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 K² X

P.E.max 1.2 KX₀²

None of these

P.E.max 1.2 KX²

49. Phase of SHM describes

Both displacement and direction of motion

Displacement only

Neither displacement nor direction of motion

Direction of motion only

50. The vibrating bodies produce

Waves

Disturbance

All of these

Sound

Page 3 of 4

51. In a simple harmonic oscillator, at the mean position

Kinetic energy is maximum, potential energy is minimum

Both kinetic and potential energies are minimum

Kinetic energy is minimum, potential energy is maximum

Both kinetic and potential energies are maximum

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

Zero in the mean position

Maximum in the extreme position

None of these

Constant

53. In case of a vibrating Pendulum, the potential energy is maximum at

Both a and b

Extreme Position

Mean Position

None

54. A vertical mass-spring system executes simple harmonic oscillations with a period of 2s A quantity of this system which exhibits simple harmonic variation with a period of 1s is

Potential energy

Difference between kinetic energy and potential energy

Velocity

Phase difference between acceleration and displacement

55. Turning of a radio set is an example of

Musical resonance

Free vibration

Electrical resonance

Mechanical resonance

56. Hook’s law is defined as

None of these

F and X has no relation

F and X are inverse proportional

F and X are direct proportional

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

Quality factor is small

Damping force is small

Restoring force is small

Applied periodic force is small

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

λ/4

λ/2

2 λ

59. The time period so a system executing simple harmonic motion depends upon

B and C

Force constant

Amplitude

Mass

60. The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes

8 s

16 s

4 s

12 s

61. In which case does the potential energy decreases?

One the rising of an air bubble in water

On compressing a spring

On stretching s spring

On moving a body against gravitational force

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

Displacement is maximum

At rest

Half way between them

Crossing mean position

63. Two springs of spring constants 1500 N/m and 3000 N/m respectively are stretched with the same force. They will have potential energy in the ratio

4 : 1

1 : 4

1 : 2

2 : 1

64. The waveform of simple harmonic motion will be

Saw tooth waveform

None of these

Square wave

Sine wave

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

A circle

A hyperbola

An ellipse

A straight line

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

Remains constant

Becomes zero

Increases

Decreases

67. To make the frequency double of an oscillator, we have to

Double the mass

Reduce the mass to one-fourth

Quadruple the mass

Half the mass

68. The velocity of the body changes at different points, it is maximum at

Mean position

None of these

Between mean and extreme position

Extreme position

69. The frequency of second pendulum is

2 hertz

0.5 hertz

1 hertz

None of these

70. Specific response of a system which is able to oscillate with a certain period, to an external force acting with the same period is called

Time period

Resonance

Doppler’s effect

Wavelength

71. Natural frequency of simple pendulum depends upon

Its length

Its mass

Square of its length

Square root of its length

72. In which of the following lists are all three quantities constant when a particle moves in undamped simple harmonic motion?

Amplitude, angular frequency, acceleration

Angular frequency, Acceleration, force

Acceleration, force, total energy

Total energy, amplitude, angular frequency

73. Frequency is the term used for

Time to take one Vibration

Number of vibration for second

Number of vibrations per minute

None of these

74. 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)

(k₁ + k₂)/2

√k₁ k₂

75. The damped oscillations are produced due to

Air resistance

All of these

Frictional support of the system

System friction

Page 4 of 4

76. Simple harmonic motion is mathematically represented as

V α – x

A α x

A α – x

F α – x

77. In a resonance striation, the driving force may be

Feeble

Extra ordinarily large

Strong

Weak

78. The restoring force applied on the pendulum

-mg sin θ

Mg sin θ

-mg cos θ

Mg cos θ

79. The frequency of these free oscillations is known as it s

Minimum frequency

Maximum frequency

None of these

Natural frequency

80. If a simple pendulum is shifted from Multan to Mount Everest, then its time period

Remains constant

Decreases

Becomes zero

Increases

81. In a simple harmonic motion (SHM), which of the following does not hold?

The force on the particle is maximum at the ends

The kinetic energy is maximum at the mean position

The potential energy is maximum at the mean position

The acceleration is minimum at the mean position

82. If the metal bob in a simple pendulum is replaced by a wooden bob, then its time period will

First A then B

Decreases

Increases

Remain the same

83. When the displacement is half of the amplitude, the ratio of potential energy to the total energy is

1/8

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

Remains same

Becomes Double

Become on fourth

Becomes one half

85. The velocity of the mass attached to a spring is maximum at

Mean position

Extreme position

None

Both a and b

86. The relation for the displacement in SHM is

X = X₀ sin ωt

X = X₀ cos ωt

None of these

X = X₀ cos (ωt + φ)

87. In a simple harmonic motion (SHM), which of the following does not hold?

The kinetic energy is maximum at the mean position

The force on the particle is maximum at the ends

The potential energy is maximum at the mean position

The acceleration is minimum at the mean position

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Maan AliLast Updated: April 18, 2025

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May 31, 2022 at 12:39 pm

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November 8, 2016 at 12:26 am

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ECAT Physics Oscillations Test Online

Physics Oscillations MCQS Online Test

ECAT Physics Oscillations Chapter Online Test

Physics Oscillations Chapter Online Test

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