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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
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Physics Oscillations Chapter Online Test

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Page 1 of 4

Physics

1. In simple harmonic motion

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.

The velocity and acceleration of the vibrating particle are in the same phase.

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

Extreme position

Both a and b

Mean position

None

3. Simple harmonic motion is mathematically represented as

F α – x

A α x

V α – x

A α – x

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

Both kinetic and potential energies are maximum

Kinetic energy is minimum, potential energy is maximum

Kinetic energy is maximum, potential energy is minimum

Both kinetic and potential energies are minimum

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

3 s

2 s

1 s

4 s

6. A simple pendulum is defined as

All of these

Friction less support

Light inextensible string

Small heavy mass

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

Minimum only

Zero

Maximum only

Maximum as well minimum

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

Quality factor is small

Damping force is small

Restoring force is small

Applied periodic force is small

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

Amplitude

Mass

Force constant

B and C

10. 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

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

Half the mass

Quadruple the mass

Double the mass

Reduce the mass to one-fourth

12. Frequency is the term used for

Number of vibrations per minute

Number of vibration for second

None of these

Time to take one Vibration

13. Hook’s law is defined as

F and X are direct proportional

None of these

F and X are inverse proportional

F and X has no relation

14. 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

15. Forced vibration are known as

Free vibration

Natural vibration

Driven harmonic vibration

Simple harmonic vibration

16. The body oscillates due to a

Frictional force

Restoring force

None of these

Applied force

17. 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

18. The kinetic energy is maximum when mass at equilibrium

P.E.max 1.2 KX₀²

None of these

P.E.max 1.2 KX²

P.E.max 1.2 K² X

19. 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

20. 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

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

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

Between mean and extreme position

Extreme position

Mean position

None of these

23. The waves produced in microwave oven have a wavelength

12cm

11.5cm

10cm

11cm

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

Remains constant

Becomes zero

Increases

Decreases

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

V = r² – x²

V = ω√r² – x²

V = √r² – x²

None of these

Page 2 of 4

26. The relation for the displacement in SHM is

X = X₀ sin ωt

None of these

X = X₀ cos (ωt + φ)

X = X₀ cos ωt

27. The damping depends upon

None of these

Sharpness

Amplitude

Both

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

λ/2

2λ

3/2 λ

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

Resonance

Oscillation

None

Damping

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

Rectilinear Motion

Simple Harmonic Motion

Circular Motion

Angular Motion

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

1/8

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

Kx²

½ Kx

½ Kx²

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

1 second

2π second

4π second

π second

34. 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 mass of the pendulum is increased

The length of the pendulum is increased

35. The frequency of second pendulum is

1 hertz

0.5 hertz

None of these

2 hertz

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

Becomes zero

Increases

Decreases

Remains constant

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

Drag force of air

None of these

Tension is string

Gravity

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

Periodic motion

Wave motion

Rotatory motion

Rectilinear motion

39. 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 mass of the pendulum is decreased

The mass of the pendulum is increased

The length of the pendulum is decreased

40. 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

2 s

4 s

3 s

1 s

41. 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

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

All of these

X₀ ω cos θ

Vp sin (90° - θ)

Vp cos θ

43. The waveform of simple harmonic motion will be

Square wave

Saw tooth waveform

None of these

Sine wave

44. Identify the exact statement among the following:

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

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

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°.

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

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

Independent of x

∞ x

∞ x²

∞ √x

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

2 x amplitude

Amplitude

4 x amplitude

Square of amplitude

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

Extreme Position

Mean Position

Both a and b

None

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

Half way between them

Displacement is maximum

Crossing mean position

At rest

49. S.I unit of frequency is

Vibration S¯²

ms¯¹

Radian

Hertz

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

Strong

Extra ordinarily large

Weak

Feeble

Page 3 of 4

51. In vibratory motion which parameter remains constant?

Angular Momentum

P.E. Energy

Total Energy

K.E. Energy

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

Minimum frequency

None of these

Maximum frequency

Natural frequency

53. The energy of the oscillation comes from the

Starting source

Driving source

None of these

Applied force

54. Natural frequency of simple pendulum depends upon

Its length

Square root of its length

Its mass

Square of its length

55. 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

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

Zero

Minimum

Maximum

None of these

57. 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

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

All of these

Gravity

Spring

Hand

59. The damped oscillations are produced due to

Air resistance

System friction

Frictional support of the system

All of these

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

Decreases

Increases

Becomes zero

Remains constant

61. 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 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 always ω²x₀ and its directed at right angles to its motion

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

P.E. = ½ KX₀²

None of these

P.E. = ½ K²X²

P.E. = ½ KX²

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)/2

k₁ k₂/( k₁ + k₂)

k₁ + k₂

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

Reduce the mass to one fourth

Double the mass

Half the mass

Quadruple the mass

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

A straight line

A circle

A hyperbola

An ellipse

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

Nine times

Three times

Four times

Twice

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

λ/2

3/2 λ

2 λ

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

λ/4

λ/2

2 λ

69. 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

1 : 2

4 : 1

1 : 4

2 : 1

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

Wavelength of the various bodies

None of these

Amplitudes of the various bodies

71. The vibrating bodies produce

All of these

Disturbance

Sound

Waves

72. 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

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

Constant

Maximum in the extreme position

None of these

Zero in the mean position

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

Fat molecules

Both

Water molecules

All of these

75. 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

Doppler’s effect

Resonance

Wavelength

Time period

Page 4 of 4

76. Turning of a radio set is an example of

Free vibration

Musical resonance

Electrical resonance

Mechanical resonance

77. 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

Angular frequency, Acceleration, force

Amplitude, angular frequency, acceleration

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

From extreme position

From means position to back to its means position

All of these

Means position to upper extreme position

79. 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

Difference between kinetic energy and potential energy

Potential energy

Velocity

80. 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

81. The restoring force applied on the pendulum

-mg sin θ

Mg cos θ

Mg sin θ

-mg cos θ

82. Phase of SHM describes

Displacement only

Neither displacement nor direction of motion

Direction of motion only

Both displacement and direction of motion

83. Restoring force is defined as

F = ½ kx

F = ma

F = -kx

F = kx

84. 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 decrease

Time period will depend on the weight of the boy.

Time period will increase

85. Oscillatory motion is a type of motion which is

Vibratory motion

To and fro

Periodic motions

All of these

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

Free vibrations

None of these

Forced vibration

Powerful vibration

87. In vibratory motion

Total momentum remain constant

P.E. remains constant

K.E. remain constant

Total energy remain 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

Physics

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Physics Oscillations MCQS Online Test

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