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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. Hook’s law is defined as

F and X are inverse proportional

F and X are direct proportional

F and X has no relation

None of these

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

Decrease

Remain unaffected

Increase

Become infinite

3. 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.

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

X₀ ω cos θ

Vp sin (90° - θ)

All of these

Vp cos θ

5. 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 kinetic energy is maximum at the mean position

The force on the particle is maximum at the ends

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

1/8

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

Restoring force is small

Quality factor is small

Damping force is small

Applied periodic force is small

8. Frequency is the term used for

None of these

Number of vibrations per minute

Number of vibration for second

Time to take one Vibration

9. 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

Phase difference between acceleration and displacement

Velocity

10. 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

Wavelength

Resonance

Doppler’s effect

11. 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 increased

The length of the pendulum is increased

The mass of the pendulum is decreased

12. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 KX₀²

P.E.max 1.2 KX²

P.E.max 1.2 K² X

None of these

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

Amplitudes of the various bodies

None of these

Wavelength of the various bodies

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

Remains same

Become on fourth

Becomes one half

Becomes Double

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

∞ x²

∞ x

∞ √x

Independent of x

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

Nine times

Twice

Four times

Three times

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

The potential energy is maximum at the mean position

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

18. Phase of SHM describes

Neither displacement nor direction of motion

Direction of motion only

Displacement only

Both displacement and direction of motion

19. The waveform of simple harmonic motion will be

None of these

Saw tooth waveform

Sine wave

Square wave

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

First A then B

Increases

Remain the same

Decreases

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

Decreases

Increases

Remains constant

Becomes zero

22. Natural frequency of simple pendulum depends upon

Its mass

Its length

Square root of its length

Square of its length

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

Both a and b

Mean position

Extreme position

None

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

None of these

Maximum in the extreme position

Zero in the mean position

Constant

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

Both kinetic and potential energies are minimum

Kinetic energy is minimum, potential energy is maximum

Kinetic energy is maximum, potential energy is minimum

Both kinetic and potential energies are maximum

Page 2 of 4

26. A simple pendulum is defined as

Small heavy mass

Friction less support

Light inextensible string

All of these

27. Oscillatory motion is a type of motion which is

Periodic motions

Vibratory motion

To and fro

All of these

28. Turning of a radio set is an example of

Musical resonance

Mechanical resonance

Electrical resonance

Free vibration

29. The frequency of second pendulum is

2 hertz

None of these

0.5 hertz

1 hertz

30. Forced vibration are known as

Simple harmonic vibration

Free vibration

Natural vibration

Driven harmonic vibration

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

All of these

From means position to back to its means position

From extreme position

Means position to upper extreme position

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

λ/2

2 λ

3/2 λ

33. S.I unit of frequency is

Vibration S¯²

ms¯¹

Radian

Hertz

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

Remains constant

Increases

Decreases

Becomes zero

35. 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 increased

The length of the pendulum is increased

The mass of the pendulum is decreased

36. 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

37. The waves produced in microwave oven have a wavelength

10cm

11.5cm

11cm

12cm

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

All of these

Hand

Spring

Gravity

39. 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 increase

Time period will depend on the weight of the boy.

Time period will decrease

40. In vibratory motion

P.E. remains constant

K.E. remain constant

Total momentum remain constant

Total energy remain constant

41. 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°.

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

Kx²

½ Kx²

½ Kx

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

Minimum frequency

Natural frequency

None of these

Maximum frequency

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

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed.

Wave moving through a string fixed at both ends.

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

Angular frequency, Acceleration, force

Total energy, amplitude, angular frequency

Acceleration, force, total energy

Amplitude, angular frequency, acceleration

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

A circle

A hyperbola

An ellipse

A straight line

47. In which case does the potential energy decreases?

One the rising of an air bubble in water

On stretching s spring

On compressing a spring

On moving a body against gravitational force

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

Maximum

None of these

Zero

Minimum

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

λ/2

λ/4

2 λ

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

None of these

V = ω√r² – x²

V = r² – x²

V = √r² – x²

Page 3 of 4

51. The energy of the oscillation comes from the

None of these

Starting source

Applied force

Driving source

52. Simple harmonic motion is mathematically represented as

A α – x

A α x

F α – x

V α – x

53. 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

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

Quadruple the mass

Reduce the mass to one fourth

Half the mass

Double the mass

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

Resonance

None

Oscillation

Damping

56. The relation for the displacement in SHM is

X = X₀ cos (ωt + φ)

None of these

X = X₀ sin ωt

X = X₀ cos ωt

57. A simple harmonic motion in which the

Acceleration is directed towards the mean position

Acceleration produced is due to restoring force

All of these

Acceleration is directly proportional to displacement

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

Powerful vibration

Free vibrations

None of these

Forced vibration

59. The damping depends upon

Both

Amplitude

Sharpness

None of these

60. Restoring force is defined as

F = ma

F = kx

F = -kx

F = ½ kx

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

Maximum only

Minimum only

Zero

Maximum as well minimum

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

Half way between them

Crossing mean position

At rest

Displacement is maximum

63. 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

64. The damped oscillations are produced due to

Frictional support of the system

System friction

Air resistance

All of these

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

Square of amplitude

Amplitude

2 x amplitude

4 x amplitude

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

67. The restoring force applied on the pendulum

Mg sin θ

Mg cos θ

-mg cos θ

-mg sin θ

68. In vibratory motion which parameter remains constant?

K.E. Energy

Total Energy

Angular Momentum

P.E. Energy

69. 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

3 s

4 s

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

Extreme Position

Both a and b

Mean Position

None

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

None of these

P.E. = ½ KX₀²

P.E. = ½ K²X²

P.E. = ½ KX²

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

All of these

Both

Water molecules

Fat molecules

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

Weak

Extra ordinarily large

Feeble

Strong

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

16 s

8 s

4 s

12 s

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

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 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.

Page 4 of 4

76. The body oscillates due to a

Restoring force

Frictional force

None of these

Applied force

77. 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

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

Angular Motion

Rectilinear Motion

Simple Harmonic Motion

Circular Motion

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

Drag force of air

Tension is string

Gravity

None of these

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

λ/2

3/2 λ

2λ

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

Mass

B and C

Amplitude

Force constant

82. The vibrating bodies produce

Sound

Waves

All of these

Disturbance

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

None of these

Between mean and extreme position

Extreme position

Mean position

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

4π second

2π second

π second

1 second

85. 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

3 s

2 s

1 s

4 s

86. 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

Periodic motion

Rotatory motion

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

Decreases

Remains constant

Increases

Becomes zero

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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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