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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. 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 decrease

Time period will not change

Time period will depend on the weight of the boy.

Time period will increase

2. The restoring force applied on the pendulum

-mg cos θ

Mg cos θ

-mg sin θ

Mg sin θ

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

P.E. = ½ KX₀²

P.E. = ½ K²X²

None of these

P.E. = ½ KX²

4. 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 potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position

5. In which case does the potential energy decreases?

On stretching s spring

On moving a body against gravitational force

One the rising of an air bubble in water

On compressing a spring

6. In vibratory motion which parameter remains constant?

K.E. Energy

Total Energy

P.E. Energy

Angular Momentum

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

Become on fourth

Becomes one half

Becomes Double

Remains same

8. 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

9. S.I unit of frequency is

Hertz

Radian

ms¯¹

Vibration S¯²

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

4 x amplitude

2 x amplitude

Square of amplitude

Amplitude

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

Remain the same

Decreases

First A then B

Increases

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

Increases

Becomes zero

Remains constant

Decreases

13. Hook’s law is defined as

F and X are inverse proportional

F and X are direct proportional

None of these

F and X has no relation

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

Minimum

Zero

Maximum

None of these

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

Oscillation

Resonance

Damping

None

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

Reduce the mass to one-fourth

Quadruple the mass

Double the mass

Half the mass

17. The damping depends upon

Amplitude

Sharpness

None of these

Both

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

Circular Motion

Rectilinear Motion

Angular Motion

Simple Harmonic Motion

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

Free vibrations

Forced vibration

Powerful vibration

None of these

20. Turning of a radio set is an example of

Free vibration

Mechanical resonance

Musical resonance

Electrical resonance

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

λ/4

λ/2

2 λ

22. Forced vibration are known as

Simple harmonic vibration

Driven harmonic vibration

Natural vibration

Free vibration

23. The damped oscillations are produced due to

All of these

System friction

Air resistance

Frictional support of the system

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

Kx²

½ Kx²

½ Kx

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

∞ √x

Independent of x

∞ x²

∞ x

Page 2 of 4

26. 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

3 s

1 s

2 s

27. A simple harmonic motion in which the

Acceleration produced is due to restoring force

All of these

Acceleration is directly proportional to displacement

Acceleration is directed towards the mean position

28. 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

29. Frequency is the term used for

None of these

Time to take one Vibration

Number of vibrations per minute

Number of vibration for second

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

Drag force of air

Tension is string

Gravity

None of these

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

Kinetic energy is minimum, potential energy is maximum

Both kinetic and potential energies are maximum

Both kinetic and potential energies are minimum

Kinetic energy is maximum, potential energy is minimum

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

Means position to upper extreme position

From extreme position

All of these

From means position to back to its means position

33. 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

Rectilinear motion

Periodic motion

Wave motion

Rotatory motion

34. The frequency of second pendulum is

0.5 hertz

None of these

1 hertz

2 hertz

35. In vibratory motion

K.E. remain constant

P.E. remains constant

Total energy remain constant

Total momentum remain constant

36. 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

Increase

Decrease

Become infinite

Remain unaffected

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

Particle moving in a circle with uniform speed.

Wave moving through a string fixed at both ends.

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

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

2 λ

3/2 λ

λ/2

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

Extreme position

Both a and b

None

Mean position

40. Phase of SHM describes

Neither displacement nor direction of motion

Direction of motion only

Displacement only

Both displacement and direction of motion

41. In simple harmonic motion

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.

The velocity of the vibrating particle is ahead in phase of the displacement by and angle π.

The acceleration of the vibrating particle is ahead of displacement by a phase of π.

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

Decreases

Remains constant

Increases

Becomes zero

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

Both

Water molecules

Fat molecules

All of these

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

1 s

2 s

3 s

4 s

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

λ/2

3/2 λ

2λ

46. The vibrating bodies produce

Waves

Sound

Disturbance

All of these

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

At rest

Displacement is maximum

Half way between them

Crossing mean position

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

Twice

Four times

Nine times

Three times

49. 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 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.

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

50. Identify the exact statement among the following:

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

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

Page 3 of 4

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

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

Decreases

Remains constant

Becomes zero

Increases

53. 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

54. The energy of the oscillation comes from the

None of these

Driving source

Applied force

Starting source

55. Oscillatory motion is a type of motion which is

Periodic motions

Vibratory motion

To and fro

All of these

56. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 KX²

P.E.max 1.2 KX₀²

None of these

P.E.max 1.2 K² X

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

Vp sin (90° - θ)

X₀ ω cos θ

All of these

Vp cos θ

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

Between mean and extreme position

Mean position

Extreme position

None of these

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

None of these

Wavelength of the various bodies

Amplitudes of the various bodies

Wavelength of the various bodies

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

A straight line

A circle

An ellipse

A hyperbola

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

None

Mean Position

Extreme Position

Both a and b

62. The waves produced in microwave oven have a wavelength

11cm

11.5cm

10cm

12cm

63. 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

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

Total energy, amplitude, angular frequency

Acceleration, force, total energy

Amplitude, angular frequency, acceleration

Angular frequency, Acceleration, force

65. 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 mass of the pendulum is decreased

The length of the pendulum is increased

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

Quality factor is small

Applied periodic force is small

Restoring force is small

Damping force is small

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

Double the mass

Quadruple the mass

Half the mass

Reduce the mass to one fourth

68. A simple pendulum is defined as

All of these

Light inextensible string

Friction less support

Small heavy mass

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

Zero

Maximum as well minimum

Maximum only

Minimum only

70. 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 : 2

2 : 1

1 : 4

71. 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

72. The relation for the displacement in SHM is

None of these

X = X₀ sin ωt

X = X₀ cos (ωt + φ)

X = X₀ cos ωt

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

8 s

16 s

12 s

4 s

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

All of these

Gravity

Hand

Spring

Page 4 of 4

76. Natural frequency of simple pendulum depends upon

Its length

Its mass

Square of its length

Square root of its length

77. 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

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

15 cm

10 cm

7.5 cm

5 cm

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

Maximum in the extreme position

Constant

None of these

Zero in the mean position

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

None of these

Maximum frequency

Minimum frequency

Natural frequency

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

Force constant

Amplitude

Mass

B and C

82. Simple harmonic motion is mathematically represented as

V α – x

F α – x

A α – x

A α x

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

1/8

84. The waveform of simple harmonic motion will be

Saw tooth waveform

Square wave

None of these

Sine wave

85. The body oscillates due to a

None of these

Applied force

Frictional force

Restoring force

86. Restoring force is defined as

F = ½ kx

F = kx

F = -kx

F = ma

87. 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

Doppler’s effect

Wavelength

Resonance

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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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