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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. For a simple pendulum the restoring force is caused by

Spring

Gravity

All of these

Hand

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

Wave moving through a string fixed at both ends.

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed.

Earth spinning about its own axis

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

Both

All of these

Water molecules

Fat molecules

4. A simple pendulum is defined as

All of these

Small heavy mass

Friction less support

Light inextensible string

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

Zero

Minimum only

Maximum only

Maximum as well minimum

6. 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

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

Damping force is small

Restoring force is small

Quality factor is small

Applied periodic force is small

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

Double the mass

Half the mass

Reduce the mass to one-fourth

Quadruple the mass

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

Free vibrations

None of these

Powerful vibration

Forced vibration

10. S.I unit of frequency is

Vibration S¯²

Hertz

Radian

ms¯¹

11. Forced vibration are known as

Natural vibration

Driven harmonic vibration

Free vibration

Simple harmonic vibration

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

From extreme position

All of these

From means position to back to its means position

Means position to upper extreme position

13. In simple harmonic motion

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

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

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

Mass

Force constant

B and C

Amplitude

15. The body oscillates due to a

None of these

Restoring force

Frictional force

Applied force

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

3 s

1 s

2 s

4 s

17. 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 length of the pendulum is decreased

The mass of the pendulum is decreased

The mass of the pendulum is increased

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

Feeble

Strong

Weak

Extra ordinarily large

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

Becomes one half

Becomes Double

Remains same

Become on fourth

20. 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°.

21. 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

Rotatory motion

Wave motion

Periodic motion

Rectilinear motion

22. In vibratory motion

K.E. remain constant

Total energy remain constant

Total momentum remain constant

P.E. remains constant

23. The energy of the oscillation comes from the

Applied force

None of these

Driving source

Starting source

24. 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

Velocity

Difference between kinetic energy and potential energy

Phase difference between acceleration and displacement

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

Maximum frequency

Natural frequency

Minimum frequency

None of these

Page 2 of 4

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

None of these

Gravity

Drag force of air

Tension is string

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

λ/4

λ/2

2 λ

28. 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 length of the pendulum is decreased

The mass of the pendulum is decreased

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

Zero

Maximum

Minimum

None of these

30. In which case does the potential energy decreases?

On stretching s spring

On compressing a spring

On moving a body against gravitational force

One the rising of an air bubble in water

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

None

Both a and b

Mean Position

Extreme Position

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

Both kinetic and potential energies are maximum

Both kinetic and potential energies are minimum

Kinetic energy is maximum, potential energy is minimum

Kinetic energy is minimum, potential energy is maximum

33. The vibrating bodies produce

All of these

Waves

Sound

Disturbance

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

Becomes zero

Remains constant

Decreases

Increases

35. Simple harmonic motion is mathematically represented as

F α – x

A α x

A α – x

V α – x

36. 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.

37. 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 increase

Time period will depend on the weight of the boy.

Time period will not change

38. A simple harmonic motion in which the

Acceleration produced is due to restoring force

Acceleration is directly proportional to displacement

Acceleration is directed towards the mean position

All of these

39. 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

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

Amplitudes of the various bodies

None of these

Wavelength of the various bodies

41. Restoring force is defined as

F = ½ kx

F = kx

F = -kx

F = ma

42. 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

4 s

16 s

43. Natural frequency of simple pendulum depends upon

Its mass

Square root of its length

Its length

Square of its length

44. The waveform of simple harmonic motion will be

Square wave

None of these

Sine wave

Saw tooth waveform

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

Simple Harmonic Motion

Angular Motion

Circular Motion

Rectilinear Motion

46. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 KX²

None of these

P.E.max 1.2 K² X

P.E.max 1.2 KX₀²

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

None of these

Constant

Zero in the mean position

Maximum in the extreme position

48. The damped oscillations are produced due to

All of these

Frictional support of the system

Air resistance

System friction

49. 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

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

Becomes zero

Increases

Decreases

Remains constant

Page 3 of 4

51. 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 : 4

1 : 2

4 : 1

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

An ellipse

A circle

A straight line

A hyperbola

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

Resonance

None

Oscillation

Damping

54. 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

55. Phase of SHM describes

Displacement only

Both displacement and direction of motion

Direction of motion only

Neither displacement nor direction of motion

56. 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

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

Nine times

Three times

Four times

Twice

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

Becomes zero

Remains constant

Increases

Decreases

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

Crossing mean position

At rest

Displacement is maximum

Half way between them

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

Extreme position

None of these

Between mean and extreme position

Mean position

61. 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

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

½ Kx

½ Kx²

Kx²

63. The relation for the displacement in SHM is

X = X₀ cos ωt

X = X₀ sin ωt

X = X₀ cos (ωt + φ)

None of these

64. The damping depends upon

Amplitude

Both

None of these

Sharpness

65. Frequency is the term used for

Number of vibrations per minute

Number of vibration for second

Time to take one Vibration

None of these

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

∞ x

∞ x²

∞ √x

Independent of x

67. 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

68. In vibratory motion which parameter remains constant?

Angular Momentum

K.E. Energy

Total Energy

P.E. Energy

69. 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

70. The restoring force applied on the pendulum

-mg sin θ

Mg sin θ

Mg cos θ

-mg cos θ

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

2 x amplitude

4 x amplitude

Amplitude

Square of amplitude

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

λ/2

2 λ

3/2 λ

73. The frequency of second pendulum is

None of these

2 hertz

1 hertz

0.5 hertz

74. The waves produced in microwave oven have a wavelength

12cm

10cm

11.5cm

11cm

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

Increases

Remain the same

First A then B

Decreases

Page 4 of 4

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

P.E. = ½ K²X²

P.E. = ½ KX²

P.E. = ½ KX₀²

None of these

77. 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

Resonance

Wavelength

Doppler’s effect

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

7.5 cm

5 cm

15 cm

10 cm

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

Both a and b

None

Extreme position

Mean position

80. 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 potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position

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

82. 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

2 s

3 s

4 s

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

1/8

84. Hook’s law is defined as

None of these

F and X are direct proportional

F and X has no relation

F and X are inverse proportional

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

2λ

3/2 λ

λ/2

86. Turning of a radio set is an example of

Electrical resonance

Free vibration

Mechanical resonance

Musical resonance

87. Oscillatory motion is a type of motion which is

To and fro

All of these

Periodic motions

Vibratory motion

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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

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Physics Oscillations Chapter Online Test

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