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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. 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 KX²

P.E. = ½ K²X²

2. Oscillatory motion is a type of motion which is

All of these

Periodic motions

To and fro

Vibratory motion

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

The kinetic energy is maximum at the mean position

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

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

Kinetic energy is maximum, potential energy is minimum

Both kinetic and potential energies are minimum

Kinetic energy is minimum, potential energy is maximum

Both kinetic and potential energies are maximum

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

Weak

Strong

Extra ordinarily large

Feeble

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)/2

k₁ k₂/( k₁ + k₂)

k₁ + k₂

√k₁ k₂

7. The waves produced in microwave oven have a wavelength

11cm

10cm

12cm

11.5cm

8. 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

Rectilinear motion

Periodic motion

9. 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 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 proportional to, and in the opposite direction to, the displacement

10. The waveform of simple harmonic motion will be

None of these

Square wave

Saw tooth waveform

Sine wave

11. The kinetic energy is maximum when mass at equilibrium

None of these

P.E.max 1.2 KX₀²

P.E.max 1.2 K² X

P.E.max 1.2 KX²

12. The relation for the displacement in SHM is

X = X₀ cos (ωt + φ)

None of these

X = X₀ sin ωt

X = X₀ cos ωt

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

Decreases

Becomes zero

Remains constant

Increases

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

From extreme position

All of these

Means position to upper extreme position

From means position to back to its means position

15. Simple harmonic motion is mathematically represented as

V α – x

F α – x

A α x

A α – x

16. Phase of SHM describes

Both displacement and direction of motion

Neither displacement nor direction of motion

Direction of motion only

Displacement only

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

18. The restoring force applied on the pendulum

-mg cos θ

Mg sin θ

-mg sin θ

Mg cos θ

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

Free vibrations

Forced vibration

Powerful vibration

None of these

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

Reduce the mass to one-fourth

Half the mass

Double the mass

Quadruple the mass

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

None

Both a and b

Extreme Position

Mean Position

22. Frequency is the term used for

Time to take one Vibration

Number of vibrations per minute

Number of vibration for second

None of these

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

Displacement is maximum

Crossing mean position

At rest

Half way between them

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

π second

1 second

4π second

2π second

25. Natural frequency of simple pendulum depends upon

Its length

Square of its length

Its mass

Square root of its length

Page 2 of 4

26. Restoring force is defined as

F = ma

F = kx

F = ½ kx

F = -kx

27. Forced vibration are known as

Natural vibration

Driven harmonic vibration

Simple harmonic vibration

Free vibration

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

Simple Harmonic Motion

Rectilinear Motion

Circular Motion

Angular Motion

29. 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 not change

Time period will depend on the weight of the boy.

30. In vibratory motion which parameter remains constant?

P.E. Energy

Angular Momentum

Total Energy

K.E. Energy

31. Turning of a radio set is an example of

Mechanical resonance

Musical resonance

Free vibration

Electrical resonance

32. The energy of the oscillation comes from the

Applied force

Starting source

None of these

Driving source

33. The vibrating bodies produce

Sound

All of these

Disturbance

Waves

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 mass of the pendulum is increased

The length of the pendulum is decreased

The length of the pendulum is increased

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

Fat molecules

Water molecules

Both

All of these

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

Nine times

Four times

Three times

Twice

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

A circle

An ellipse

A hyperbola

A straight line

38. 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

2 : 1

1 : 4

1 : 2

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

None of these

Between mean and extreme position

Mean position

Extreme position

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

Half the mass

Quadruple the mass

Double the mass

Reduce the mass to one fourth

41. 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

Remain unaffected

Become infinite

42. A simple harmonic motion in which the

Acceleration is directed towards the mean position

All of these

Acceleration is directly proportional to displacement

Acceleration produced is due to restoring force

43. In which case does the potential energy decreases?

One the rising of an air bubble in water

On stretching s spring

On moving a body against gravitational force

On compressing a spring

44. 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

45. 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

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

∞ x

∞ √x

Independent of x

∞ x²

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

Spring

Hand

Gravity

All of these

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

Wave moving through a string fixed at both ends.

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed.

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

Amplitude, angular frequency, acceleration

Acceleration, force, total energy

Angular frequency, Acceleration, force

Total energy, amplitude, angular frequency

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

Mean position

Both a and b

None

Extreme position

Page 3 of 4

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

Become on fourth

Remains same

Becomes one half

Becomes Double

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

½ Kx

Kx²

½ Kx²

53. The damping depends upon

Sharpness

None of these

Both

Amplitude

54. 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

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

Resonance

Damping

Oscillation

None

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

3/2 λ

λ/2

2λ

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

λ/2

2 λ

λ/4

58. A simple pendulum is defined as

Small heavy mass

All of these

Friction less support

Light inextensible string

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

4 s

8 s

16 s

12 s

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

Mass

Force constant

B and C

Amplitude

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

7.5 cm

5 cm

10 cm

15 cm

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

3/2 λ

λ/2

2 λ

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

None of these

Gravity

Tension is string

Drag force of air

64. In simple harmonic motion

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

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

65. The body oscillates due to a

None of these

Applied force

Frictional force

Restoring force

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

V = √r² – x²

V = ω√r² – x²

None of these

V = r² – x²

67. In vibratory motion

K.E. remain constant

Total energy remain constant

P.E. remains constant

Total momentum remain constant

68. The damped oscillations are produced due to

Frictional support of the system

All of these

Air resistance

System friction

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

Maximum frequency

Minimum frequency

Natural frequency

None of these

70. The frequency of second pendulum is

2 hertz

0.5 hertz

None of these

1 hertz

71. 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

Wavelength

Time period

Resonance

72. 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

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

Square of amplitude

4 x amplitude

Amplitude

2 x amplitude

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

Constant

None of these

Zero in the mean position

Maximum in the extreme position

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

Wavelength of the various bodies

None of these

Wavelength of the various bodies

Amplitudes of the various bodies

Page 4 of 4

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

1/8

77. 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

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

Remain the same

First A then B

Decreases

Increases

79. S.I unit of frequency is

Radian

Hertz

Vibration S¯²

ms¯¹

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

Increases

Becomes zero

Decreases

Remains constant

81. 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

Phase difference between acceleration and displacement

Velocity

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

Minimum only

Maximum only

Maximum as well minimum

Zero

83. 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 decreased

The mass of the pendulum is increased

The length of the pendulum is increased

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

Remains constant

Increases

Becomes zero

Decreases

85. 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

86. 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 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.

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

Minimum

None of these

Maximum

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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