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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. A simple pendulum is defined as

Friction less support

Small heavy mass

Light inextensible string

All of these

2. A simple harmonic motion in which the

All of these

Acceleration produced is due to restoring force

Acceleration is directed towards the mean position

Acceleration is directly proportional to displacement

3. Turning of a radio set is an example of

Musical resonance

Free vibration

Electrical resonance

Mechanical resonance

4. 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 increased

The length of the pendulum is increased

The length of the pendulum is decreased

The mass of the pendulum is decreased

5. The frequency of second pendulum is

None of these

2 hertz

0.5 hertz

1 hertz

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

Displacement is maximum

Half way between them

At rest

Crossing mean position

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

Force constant

Amplitude

Mass

B and C

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

Remain the same

First A then B

Decreases

Increases

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

Weak

Extra ordinarily large

Strong

Feeble

10. The waveform of simple harmonic motion will be

Square wave

None of these

Saw tooth waveform

Sine wave

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

12 s

16 s

8 s

4 s

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

13. 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

Velocity

Potential energy

Phase difference between acceleration and displacement

Difference between kinetic energy and potential energy

14. 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 increased

The length of the pendulum is decreased

The mass of the pendulum is decreased

The length of the pendulum is increased

15. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 KX²

P.E.max 1.2 K² X

None of these

P.E.max 1.2 KX₀²

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

∞ √x

Independent of x

∞ x

∞ x²

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

λ/4

λ/2

2 λ

18. Forced vibration are known as

Free vibration

Natural vibration

Driven harmonic vibration

Simple harmonic vibration

19. Phase of SHM describes

Displacement only

Both displacement and direction of motion

Neither displacement nor direction of motion

Direction of motion only

20. 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

2 : 1

1 : 2

1 : 4

4 : 1

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

π second

4π second

1 second

2π second

22. 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

Rotatory motion

Periodic motion

Rectilinear motion

Wave motion

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

Double the mass

Half the mass

Reduce the mass to one-fourth

Quadruple the mass

24. The energy of the oscillation comes from the

Applied force

Driving source

Starting source

None of these

25. 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 2 of 4

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

Becomes one half

Remains same

Becomes Double

Become on fourth

27. In vibratory motion which parameter remains constant?

Total Energy

K.E. Energy

Angular Momentum

P.E. Energy

28. The damping depends upon

Sharpness

Amplitude

None of these

Both

29. The restoring force applied on the pendulum

Mg cos θ

-mg cos θ

-mg sin θ

Mg sin θ

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

None of these

Minimum

Zero

Maximum

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

2λ

λ/2

3/2 λ

32. 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 K²X²

P.E. = ½ KX₀²

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

None of these

Extreme position

Mean position

Between mean and extreme position

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

Four times

Twice

Nine times

Three times

35. 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

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

Zero

Maximum only

Minimum only

Maximum as well minimum

37. 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

k₁ k₂/( k₁ + k₂)

√k₁ k₂

38. Frequency is the term used for

Number of vibrations per minute

Number of vibration for second

Time to take one Vibration

None of these

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

5 cm

10 cm

15 cm

7.5 cm

40. Oscillatory motion is a type of motion which is

Vibratory motion

All of these

To and fro

Periodic motions

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

Zero in the mean position

None of these

Constant

Maximum in the extreme position

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

Damping

None

Resonance

Oscillation

43. 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

3 s

4 s

2 s

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

None

Mean Position

Extreme Position

Both a and b

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

Water molecules

All of these

Fat molecules

Both

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

Maximum frequency

Natural frequency

Minimum frequency

None of these

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

All of these

X₀ ω cos θ

Vp sin (90° - θ)

Vp cos θ

48. The vibrating bodies produce

Sound

Disturbance

All of these

Waves

49. Simple harmonic motion is mathematically represented as

V α – x

A α – x

A α x

F α – x

50. Identify the exact statement among the following:

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

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°.

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

Page 3 of 4

51. The body oscillates due to a

Frictional force

None of these

Restoring force

Applied force

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

A hyperbola

A straight line

An ellipse

A circle

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

Both kinetic and potential energies are minimum

Kinetic energy is minimum, potential energy is maximum

Both kinetic and potential energies are maximum

Kinetic energy is maximum, potential energy is minimum

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

Means position to upper extreme position

From extreme position

From means position to back to its means position

All of these

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

Wavelength of the various bodies

Amplitudes of the various bodies

None of these

56. The relation for the displacement in SHM is

X = X₀ cos (ωt + φ)

X = X₀ sin ωt

None of these

X = X₀ cos ωt

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

Powerful vibration

None of these

Free vibrations

Forced vibration

58. 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 depend on the weight of the boy.

Time period will increase

Time period will not change

Time period will decrease

59. Hook’s law is defined as

F and X are direct proportional

F and X are inverse proportional

None of these

F and X has no relation

60. 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

Doppler’s effect

Time period

Wavelength

Resonance

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

Gravity

Tension is string

None of these

Drag force of air

62. Restoring force is defined as

F = -kx

F = kx

F = ma

F = ½ kx

63. S.I unit of frequency is

Hertz

Radian

ms¯¹

Vibration S¯²

64. In which case does the potential energy decreases?

On moving a body against gravitational force

On stretching s spring

On compressing a spring

One the rising of an air bubble in water

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

λ/2

2 λ

3/2 λ

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

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

The kinetic energy is maximum at the mean position

67. The damped oscillations are produced due to

Air resistance

System friction

All of these

Frictional support of the system

68. The waves produced in microwave oven have a wavelength

11.5cm

12cm

11cm

10cm

69. 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 and displacement if 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.

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

Amplitude, angular frequency, acceleration

Acceleration, force, total energy

Total energy, amplitude, angular frequency

Angular frequency, Acceleration, force

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

2 s

1 s

4 s

3 s

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

V = √r² – x²

V = ω√r² – x²

V = r² – x²

None of these

73. Natural frequency of simple pendulum depends upon

Square root of its length

Square of its length

Its length

Its mass

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

Hand

All of these

Spring

Gravity

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

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

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

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

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

Page 4 of 4

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

Circular Motion

Rectilinear Motion

Angular Motion

Simple Harmonic Motion

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

Amplitude

4 x amplitude

Square of amplitude

2 x amplitude

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

½ Kx

½ Kx²

Kx²

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

1/8

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

Remains constant

Increases

Decreases

Becomes zero

81. 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

Remain unaffected

Increase

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

Reduce the mass to one fourth

Half the mass

Quadruple the mass

Double the mass

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

None

Extreme position

Both a and b

Mean position

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

Remains constant

Becomes zero

Increases

Decreases

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

Remains constant

Increases

Decreases

Becomes zero

86. In vibratory motion

K.E. remain constant

Total energy remain constant

Total momentum remain constant

P.E. remains constant

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

Earth spinning about its own axis

Wave moving through a string fixed at both ends.

Particle moving in a circle with uniform speed.

Ball bouncing between two rigid vertical walls

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Maan AliLast Updated: April 18, 2025

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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

Physics

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Maan Ali

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Physics Oscillations MCQS Online Test

ECAT Physics Oscillations Chapter Online Test

Physics Oscillations Chapter Online Test

Physics

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Maan Ali

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