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

A circle

A straight line

A hyperbola

An ellipse

2. 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

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

Crossing mean position

Half way between them

At rest

Displacement is maximum

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

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

The acceleration is minimum at the mean position

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

Both a and b

None

Extreme position

Mean position

6. Natural frequency of simple pendulum depends upon

Its length

Square root of its length

Its mass

Square of its length

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

Becomes zero

Decreases

Remains constant

Increases

8. The waves produced in microwave oven have a wavelength

11cm

10cm

11.5cm

12cm

9. Turning of a radio set is an example of

Free vibration

Musical resonance

Mechanical resonance

Electrical resonance

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

11. Simple harmonic motion is mathematically represented as

F α – x

A α x

V α – x

A α – x

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

5 cm

15 cm

7.5 cm

10 cm

13. 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

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

3/2 λ

λ/2

2 λ

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

Amplitudes of the various bodies

Wavelength of the various bodies

None of these

Wavelength of the various bodies

16. 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

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

Applied periodic force is small

Restoring force is small

Damping force is small

Quality factor is small

18. 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

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

Ball bouncing between two rigid vertical walls

Earth spinning about its own axis

Wave moving through a string fixed at both ends.

Particle moving in a circle with uniform speed.

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

Hand

Spring

Gravity

All of these

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

12 s

8 s

16 s

4 s

22. 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 mass of the pendulum is decreased

The length of the pendulum is decreased

23. 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

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

∞ x

∞ x²

Independent of x

∞ √x

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

Powerful vibration

None of these

Free vibrations

Forced vibration

Page 2 of 4

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

Maximum frequency

None of these

Minimum frequency

Natural frequency

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

Vp sin (90° - θ)

All of these

Vp cos θ

X₀ ω cos θ

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

Angular Motion

Circular Motion

Rectilinear Motion

Simple Harmonic Motion

29. 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

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

Damping

None

Oscillation

Resonance

31. The damped oscillations are produced due to

Air resistance

Frictional support of the system

All of these

System friction

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

Extra ordinarily large

Feeble

Weak

Strong

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

π second

2π second

4π second

1 second

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

None of these

Tension is string

Drag force of air

Gravity

35. 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

36. In vibratory motion

K.E. remain constant

Total momentum remain constant

Total energy remain constant

P.E. remains constant

37. A simple harmonic motion in which the

Acceleration produced is due to restoring force

All of these

Acceleration is directed towards the mean position

Acceleration is directly proportional to displacement

38. 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

Rotatory motion

Periodic motion

Wave motion

39. A simple pendulum is defined as

Light inextensible string

Small heavy mass

Friction less support

All of these

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

Increases

Decreases

First A then B

Remain the same

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

Quadruple the mass

Half the mass

Double the mass

Reduce the mass to one-fourth

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

None of these

Maximum in the extreme position

Constant

Zero in the mean position

43. Identify the exact statement among the following:

The greater the mass of pendulum bob, the shorter is its frequency of oscillation

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

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

44. Restoring force is defined as

F = kx

F = ½ kx

F = ma

F = -kx

45. 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

46. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 KX₀²

P.E.max 1.2 K² X

P.E.max 1.2 KX²

None of these

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

Minimum only

Maximum as well minimum

Maximum only

Zero

48. Hook’s law is defined as

F and X are inverse proportional

None of these

F and X are direct proportional

F and X has no relation

49. In vibratory motion which parameter remains constant?

Angular Momentum

Total Energy

P.E. Energy

K.E. Energy

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

λ/4

2 λ

λ/2

Page 3 of 4

51. Frequency is the term used for

Time to take one Vibration

Number of vibration for second

Number of vibrations per minute

None of these

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

Become on fourth

Becomes Double

Remains same

Becomes one half

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

Square of amplitude

4 x amplitude

Amplitude

2 x amplitude

54. The body oscillates due to a

Frictional force

Restoring force

None of these

Applied force

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

V = √r² – x²

V = r² – x²

V = ω√r² – x²

None of these

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

Four times

Twice

Nine times

Three times

57. 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 length of the pendulum is increased

The mass of the pendulum is decreased

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

Remains constant

Increases

Decreases

Becomes zero

59. 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

Difference between kinetic energy and potential energy

Potential energy

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

1/8

61. The waveform of simple harmonic motion will be

Square wave

Saw tooth waveform

None of these

Sine wave

62. 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

Become infinite

Decrease

Increase

63. S.I unit of frequency is

ms¯¹

Hertz

Radian

Vibration S¯²

64. Phase of SHM describes

Both displacement and direction of motion

Displacement only

Neither displacement nor direction of motion

Direction of motion only

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

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

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

Remains constant

Increases

Decreases

Becomes zero

67. 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

68. Oscillatory motion is a type of motion which is

All of these

Vibratory motion

To and fro

Periodic motions

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

Half the mass

Quadruple the mass

Reduce the mass to one fourth

Double the mass

70. 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

Resonance

Doppler’s effect

Wavelength

Time period

71. The energy of the oscillation comes from the

Starting source

None of these

Driving source

Applied force

72. Forced vibration are known as

Natural vibration

Free vibration

Simple harmonic vibration

Driven harmonic vibration

73. The frequency of second pendulum is

2 hertz

0.5 hertz

None of these

1 hertz

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

Extreme Position

Both a and b

None

Mean Position

75. The vibrating bodies produce

All of these

Waves

Sound

Disturbance

Page 4 of 4

76. The damping depends upon

Both

Amplitude

Sharpness

None of these

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

Minimum

Maximum

Zero

None of these

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

All of these

Means position to upper extreme position

From means position to back to its means position

From extreme position

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

Kx²

½ Kx

½ Kx²

80. 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

4 s

3 s

2 s

81. The restoring force applied on the pendulum

Mg sin θ

Mg cos θ

-mg cos θ

-mg sin θ

82. The relation for the displacement in SHM is

X = X₀ sin ωt

X = X₀ cos ωt

X = X₀ cos (ωt + φ)

None of these

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

P.E. = ½ K²X²

P.E. = ½ KX₀²

P.E. = ½ KX²

None of these

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

All of these

Fat molecules

Water molecules

Both

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

Force constant

B and C

Amplitude

Mass

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

λ/2

2λ

3/2 λ

87. 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 depend on the weight of the boy.

Time period will decrease

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Maan AliLast Updated: April 18, 2025

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3 Comments

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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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