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

Ball bouncing between two rigid vertical walls

Wave moving through a string fixed at both ends.

Particle moving in a circle with uniform speed.

Earth spinning about its own axis

2. 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

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

Decreases

Remains constant

Increases

Becomes zero

4. Natural frequency of simple pendulum depends upon

Its length

Square root of its length

Square of its length

Its mass

5. 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

4 : 1

1 : 2

1 : 4

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

Four times

Twice

Nine times

Three times

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

4 s

12 s

16 s

8 s

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

∞ √x

∞ x²

∞ x

Independent of x

9. The waves produced in microwave oven have a wavelength

12cm

11cm

10cm

11.5cm

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

Half the mass

Double the mass

Quadruple the mass

Reduce the mass to one-fourth

11. Simple harmonic motion is mathematically represented as

A α – x

F α – x

V α – x

A α x

12. 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

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

Minimum

Zero

None of these

Maximum

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

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

Crossing mean position

At rest

Half way between them

Displacement is maximum

16. The energy of the oscillation comes from the

Driving source

Starting source

None of these

Applied force

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

λ/2

3/2 λ

2λ

18. 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

19. In vibratory motion which parameter remains constant?

Total Energy

K.E. Energy

Angular Momentum

P.E. Energy

20. The damped oscillations are produced due to

System friction

Frictional support of the system

Air resistance

All of these

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

None of these

Forced vibration

Powerful vibration

Free vibrations

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

1/8

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

Drag force of air

Gravity

Tension is string

None of these

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

From extreme position

Means position to upper extreme position

From means position to back to its means position

All of these

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

½ Kx

Kx²

½ Kx²

Page 2 of 4

26. Frequency is the term used for

Number of vibration for second

Time to take one Vibration

None of these

Number of vibrations per minute

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

4 s

2 s

1 s

3 s

28. The damping depends upon

None of these

Amplitude

Sharpness

Both

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

1 second

2π second

π second

4π second

30. The restoring force applied on the pendulum

Mg cos θ

-mg sin θ

-mg cos θ

Mg sin θ

31. In simple harmonic motion

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.

The velocity and displacement if the vibrating particle are in the same phase

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

Restoring force is small

Applied periodic force is small

Quality factor is small

Damping force is small

33. 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 kinetic energy is maximum at the mean position

The acceleration is minimum at the mean position

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

None of these

Maximum in the extreme position

Zero in the mean position

Constant

35. 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

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

None

Mean position

Extreme position

Both a and b

37. A simple pendulum is defined as

Small heavy mass

All of these

Friction less support

Light inextensible string

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

Hand

All of these

Gravity

Spring

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

Extra ordinarily large

Strong

Weak

Feeble

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

Both kinetic and potential energies are minimum

Both kinetic and potential energies are maximum

Kinetic energy is minimum, potential energy is maximum

Kinetic energy is maximum, potential energy is minimum

41. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 K² X

P.E.max 1.2 KX²

None of these

P.E.max 1.2 KX₀²

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

Damping

None

Resonance

Oscillation

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

Both

Fat molecules

All of these

Water molecules

44. Restoring force is defined as

F = ½ kx

F = kx

F = -kx

F = ma

45. 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

Phase difference between acceleration and displacement

Velocity

Potential energy

Difference between kinetic energy and potential energy

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

4 x amplitude

2 x amplitude

Square of amplitude

Amplitude

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

P.E. = ½ KX₀²

None of these

P.E. = ½ K²X²

P.E. = ½ KX²

48. 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

1 s

3 s

2 s

49. The frequency of second pendulum is

1 hertz

2 hertz

0.5 hertz

None of these

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

Maximum as well minimum

Minimum only

Zero

Maximum only

Page 3 of 4

51. 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

Resonance

Wavelength

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

10 cm

7.5 cm

15 cm

5 cm

53. 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

(k₁ + k₂)/2

54. The relation for the displacement in SHM is

None of these

X = X₀ cos (ωt + φ)

X = X₀ sin ωt

X = X₀ cos ωt

55. Hook’s law is defined as

F and X are inverse proportional

None of these

F and X has no relation

F and X are direct proportional

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

Angular frequency, Acceleration, force

Acceleration, force, total energy

Total energy, amplitude, angular frequency

Amplitude, angular frequency, acceleration

57. Turning of a radio set is an example of

Electrical resonance

Musical resonance

Mechanical resonance

Free vibration

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

Reduce the mass to one fourth

Quadruple the mass

Double the mass

Half the mass

59. 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 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.

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

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

The force on the particle is maximum at the ends

The acceleration is minimum at the mean position

The kinetic energy is maximum at the mean position

The potential energy is maximum at the mean position

61. 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 depend on the weight of the boy.

Time period will decrease

Time period will increase

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

Remains same

Becomes Double

Becomes one half

Become on fourth

63. The waveform of simple harmonic motion will be

None of these

Square wave

Saw tooth waveform

Sine wave

64. The body oscillates due to a

Applied force

Restoring force

None of these

Frictional force

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

3/2 λ

2 λ

λ/2

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

Remains constant

Decreases

Increases

Becomes zero

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

Increases

Remains constant

Becomes zero

Decreases

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

None

Both a and b

Extreme Position

Mean Position

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

Maximum frequency

None of these

Minimum frequency

Natural frequency

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

2 λ

λ/2

λ/4

71. Forced vibration are known as

Free vibration

Simple harmonic vibration

Natural vibration

Driven harmonic vibration

72. In vibratory motion

Total energy remain constant

P.E. remains constant

K.E. remain constant

Total momentum remain constant

73. 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

Periodic motion

Rotatory motion

Rectilinear motion

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

Decreases

Remain the same

Increases

First A then B

75. 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

Page 4 of 4

76. Phase of SHM describes

Direction of motion only

Both displacement and direction of motion

Neither displacement nor direction of motion

Displacement only

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

None of these

Amplitudes of the various bodies

Wavelength of the various bodies

78. The vibrating bodies produce

Sound

All of these

Disturbance

Waves

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

B and C

Force constant

Amplitude

Mass

80. S.I unit of frequency is

Vibration S¯²

Radian

Hertz

ms¯¹

81. Oscillatory motion is a type of motion which is

To and fro

All of these

Vibratory motion

Periodic motions

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

A hyperbola

A straight line

A circle

An ellipse

83. 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

84. 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

85. In which case does the potential energy decreases?

On stretching s spring

On compressing a spring

One the rising of an air bubble in water

On moving a body against gravitational force

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

Rectilinear Motion

Circular Motion

Angular Motion

Simple Harmonic Motion

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

Vp cos θ

X₀ ω cos θ

Vp sin (90° - θ)

All of these

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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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Physics Oscillations MCQS Online Test

ECAT Physics Oscillations Chapter Online Test

Physics Oscillations Chapter Online Test

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