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

4 s

3 s

2 s

1 s

2. 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

Remain unaffected

Increase

Decrease

Become infinite

3. The relation for the displacement in SHM is

X = X₀ cos (ωt + φ)

X = X₀ sin ωt

None of these

X = X₀ cos ωt

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

Kinetic energy is maximum, potential energy is minimum

Kinetic energy is minimum, potential energy is maximum

Both kinetic and potential energies are maximum

Both kinetic and potential energies are minimum

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

None of these

Amplitudes of the various bodies

Wavelength of the various bodies

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

4 s

16 s

8 s

12 s

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

10 cm

5 cm

15 cm

7.5 cm

8. In which case does the potential energy decreases?

On stretching s spring

One the rising of an air bubble in water

On moving a body against gravitational force

On compressing a spring

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

Kx²

½ Kx²

½ Kx

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

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

All of these

Means position to upper extreme position

From extreme position

From means position to back to its means position

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 decreased

The length of the pendulum is decreased

The length of the pendulum is increased

The mass of the pendulum is increased

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

Difference between kinetic energy and potential energy

Potential energy

Velocity

Phase difference between acceleration and displacement

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

Remains constant

Becomes zero

Decreases

Increases

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

Maximum only

Zero

Minimum only

Maximum as well minimum

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

Mean position

None of these

Extreme position

Between mean and extreme position

17. The vibrating bodies produce

Disturbance

Sound

Waves

All of these

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

Acceleration, force, total energy

Amplitude, angular frequency, acceleration

Total energy, amplitude, angular frequency

Angular frequency, Acceleration, force

19. 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

20. Simple harmonic motion is mathematically represented as

F α – x

A α – x

V α – x

A α x

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

Resonance

Oscillation

Damping

None

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

Maximum

None of these

Zero

Minimum

23. A simple pendulum is defined as

Light inextensible string

All of these

Friction less support

Small heavy mass

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

The acceleration is minimum at the mean position

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

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

None of these

Minimum frequency

Natural frequency

Maximum frequency

Page 2 of 4

26. S.I unit of frequency is

ms¯¹

Radian

Hertz

Vibration S¯²

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

At rest

Half way between them

Displacement is maximum

Crossing mean position

28. 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 not change

Time period will decrease

Time period will depend on the weight of the boy.

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

V = √r² – x²

None of these

V = ω√r² – x²

V = r² – x²

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

Rectilinear Motion

Angular Motion

Circular Motion

Simple Harmonic Motion

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

Hand

Gravity

Spring

All of these

32. 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

Wavelength

Doppler’s effect

Time period

Resonance

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

1/8

34. Oscillatory motion is a type of motion which is

To and fro

Periodic motions

Vibratory motion

All of these

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

A hyperbola

An ellipse

A circle

A straight line

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

4 x amplitude

Amplitude

2 x amplitude

Square of amplitude

37. 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 always given by the expression x = x₀ sin ωt.

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

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

Constant

None of these

Maximum in the extreme position

Zero in the mean position

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

Increases

Becomes zero

Remains constant

Decreases

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

Fat molecules

Both

All of these

Water molecules

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

∞ x

∞ x²

Independent of x

∞ √x

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

P.E. = ½ KX²

P.E. = ½ K²X²

P.E. = ½ KX₀²

None of these

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

3/2 λ

2λ

λ/2

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

Both a and b

Extreme Position

Mean Position

None

45. 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 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

46. Turning of a radio set is an example of

Musical resonance

Free vibration

Electrical resonance

Mechanical resonance

47. In vibratory motion which parameter remains constant?

P.E. Energy

Angular Momentum

K.E. Energy

Total Energy

48. The waves produced in microwave oven have a wavelength

11.5cm

10cm

12cm

11cm

49. 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 decreased

The mass of the pendulum is decreased

The length of the pendulum is increased

The mass of the pendulum is increased

50. The damping depends upon

Both

Sharpness

Amplitude

None of these

Page 3 of 4

51. A simple harmonic motion in which the

All of these

Acceleration is directly proportional to displacement

Acceleration produced is due to restoring force

Acceleration is directed towards the mean position

52. 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.

Earth spinning about its own axis

Particle moving in a circle with uniform speed.

53. The waveform of simple harmonic motion will be

None of these

Square wave

Sine wave

Saw tooth waveform

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

Decreases

First A then B

Remain the same

Increases

55. The frequency of second pendulum is

1 hertz

0.5 hertz

2 hertz

None of these

56. The kinetic energy is maximum when mass at equilibrium

None of these

P.E.max 1.2 KX²

P.E.max 1.2 KX₀²

P.E.max 1.2 K² X

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

Reduce the mass to one-fourth

Half the mass

Double the mass

Quadruple the mass

58. Natural frequency of simple pendulum depends upon

Square of its length

Its mass

Square root of its length

Its length

59. Phase of SHM describes

Both displacement and direction of motion

Neither displacement nor direction of motion

Direction of motion only

Displacement only

60. In vibratory motion

Total energy remain constant

K.E. remain constant

P.E. remains constant

Total momentum remain constant

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

λ/2

2 λ

3/2 λ

62. The damped oscillations are produced due to

Air resistance

System friction

Frictional support of the system

All of these

63. Frequency is the term used for

None of these

Time to take one Vibration

Number of vibration for second

Number of vibrations per minute

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

Mass

Force constant

B and C

Amplitude

65. The restoring force applied on the pendulum

Mg cos θ

-mg sin θ

-mg cos θ

Mg sin θ

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

X₀ ω cos θ

All of these

Vp cos θ

Vp sin (90° - θ)

67. 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

68. The body oscillates due to a

Restoring force

Applied force

Frictional force

None of these

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

The acceleration is minimum at the mean position

The potential energy is maximum at the mean position

The force on the particle is maximum at the ends

The kinetic energy is maximum at the mean position

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

Remains same

Become on fourth

Becomes Double

Becomes one half

71. 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 : 4

1 : 2

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

2 λ

λ/2

λ/4

73. Identify the exact statement among the following:

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

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°.

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

Restoring force is small

Damping force is small

Quality factor is small

Applied periodic force is small

75. 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

Periodic motion

Rectilinear motion

Rotatory motion

Wave motion

Page 4 of 4

76. Hook’s law is defined as

None of these

F and X has no relation

F and X are direct proportional

F and X are inverse proportional

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

π second

1 second

2π second

4π second

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

Drag force of air

Gravity

None of these

Tension is string

79. Forced vibration are known as

Driven harmonic vibration

Free vibration

Natural vibration

Simple harmonic vibration

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

Nine times

Twice

Four times

Three times

81. Restoring force is defined as

F = ma

F = -kx

F = kx

F = ½ kx

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

Extra ordinarily large

Weak

Feeble

Strong

83. 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

1 s

3 s

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

None

Both a and b

Mean position

Extreme position

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

None of these

Forced vibration

Free vibrations

Powerful vibration

86. The energy of the oscillation comes from the

Driving source

None of these

Applied force

Starting source

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

Increases

Decreases

Becomes zero

Remains constant

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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

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