Physics Oscillations Online Mcqs Test

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Question 1

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

Answer

Fat molecules

Answer

All of these

Answer

Water molecules

Question 2

2. 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

Question 3

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

Question 4

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

Answer

First A then B

Answer

Remain the same

Question 5

5. The waves produced in microwave oven have a wavelength

Question 6

6. A simple pendulum is defined as

Answer

Small heavy mass

Answer

Light inextensible string

Answer

Friction less support

Answer

All of these

Question 7

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

Question 8

8. Frequency is the term used for

Answer

Number of vibrations per minute

Answer

None of these

Answer

Time to take one Vibration

Answer

Number of vibration for second

Question 9

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

Answer

Maximum only

Answer

Minimum only

Answer

Maximum as well minimum

Question 10

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

Question 11

11. The body oscillates due to a

Answer

Frictional force

Answer

Applied force

Answer

Restoring force

Answer

None of these

Question 12

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

Answer

None of these

Answer

Natural frequency

Answer

Maximum frequency

Answer

Minimum frequency

Question 13

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

Answer

Quality factor is small

Answer

Restoring force is small

Answer

Damping force is small

Answer

Applied periodic force is small

Question 14

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

Answer

Both a and b

Answer

Extreme Position

Answer

Mean Position

Question 15

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

Answer

2π second

Answer

4π second

Question 16

16. The energy of the oscillation comes from the

Answer

Starting source

Answer

Applied force

Answer

None of these

Answer

Driving source

Question 17

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

Answer

All of these

Answer

From extreme position

Answer

From means position to back to its means position

Answer

Means position to upper extreme position

Question 18

18. Simple harmonic motion is mathematically represented as

Answer

F α – x

Answer

A α – x

Answer

V α – x

Question 19

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

Answer

Mean position

Answer

Between mean and extreme position

Answer

None of these

Answer

Extreme position

Question 20

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

Answer

Four times

Answer

Three times

Answer

Nine times

Question 21

21. Simple harmonic motion is defined as the motion of a particle such that

Answer

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

Answer

Its acceleration is always ω²x₀ and its directed at right angles to its motion

Answer

Its displacement x is always given by the expression x = x₀ sin ωt.

Answer

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

Question 22

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

Answer

Earth spinning about its own axis

Answer

Wave moving through a string fixed at both ends.

Answer

Particle moving in a circle with uniform speed.

Answer

Ball bouncing between two rigid vertical walls

Question 23

23. Phase of SHM describes

Answer

Both displacement and direction of motion

Answer

Direction of motion only

Answer

Neither displacement nor direction of motion

Answer

Displacement only

Question 24

24. Oscillatory motion is a type of motion which is

Answer

All of these

Answer

To and fro

Answer

Periodic motions

Answer

Vibratory motion

Question 25

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

Answer

A straight line

Answer

An ellipse

Answer

A hyperbola

Question 26

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

Answer

All of these

Answer

X₀ ω cos θ

Answer

Vp sin (90° - θ)

Question 27

27. Two springs of spring constants k₁ and k₂ are joined in series. The effective spring constant of the combination is given by

Answer

√k₁ k₂

Answer

k₁ + k₂

Answer

k₁ k₂/( k₁ + k₂)

Answer

(k₁ + k₂)/2

Question 28

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

Answer

V = √r² – x²

Answer

V = r² – x²

Answer

None of these

Answer

V = ω√r² – x²

Question 29

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

Answer

Wavelength of the various bodies

Answer

Amplitudes of the various bodies

Answer

None of these

Answer

Wavelength of the various bodies

Question 30

30. Natural frequency of simple pendulum depends upon

Answer

Square root of its length

Answer

Square of its length

Answer

Its length

Question 31

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

Answer

Both kinetic and potential energies are maximum

Answer

Kinetic energy is maximum, potential energy is minimum

Answer

Both kinetic and potential energies are minimum

Answer

Kinetic energy is minimum, potential energy is maximum

Question 32

32. In which case does the potential energy decreases?

Answer

One the rising of an air bubble in water

Answer

On moving a body against gravitational force

Answer

On stretching s spring

Answer

On compressing a spring

Question 33

33. Identify the exact statement among the following:

Answer

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

Answer

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°.

Answer

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

Answer

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

Question 34

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

Question 35

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

Answer

Extra ordinarily large

Question 36

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

Question 37

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

Answer

Force constant

Question 38

38. Restoring force is defined as

Question 39

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

Answer

Zero in the mean position

Answer

Maximum in the extreme position

Answer

None of these

Question 40

40. In vibratory motion

Answer

Total momentum remain constant

Answer

P.E. remains constant

Answer

Total energy remain constant

Answer

K.E. remain constant

Question 41

41. A pendulum clock set to give correct time in Karachi is taken to Quetta. It would give correct time if

Answer

The length of the pendulum is decreased

Answer

The mass of the pendulum is decreased

Answer

The mass of the pendulum is increased

Answer

The length of the pendulum is increased

Question 42

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

Answer

Powerful vibration

Answer

Forced vibration

Answer

None of these

Answer

Free vibrations

Question 43

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

Answer

Half the mass

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Answer

Double the mass

Question 44

44. A simple harmonic motion in which the

Answer

Acceleration is directly proportional to displacement

Answer

Acceleration is directed towards the mean position

Answer

All of these

Answer

Acceleration produced is due to restoring force

Question 45

45. Turning of a radio set is an example of

Answer

Electrical resonance

Answer

Free vibration

Answer

Musical resonance

Answer

Mechanical resonance

Question 46

46. A pendulum clock set to give correct time in Karachi is taken to Quetta. It would give correct time if

Answer

The mass of the pendulum is increased

Answer

The length of the pendulum is decreased

Answer

The length of the pendulum is increased

Answer

The mass of the pendulum is decreased

Question 47

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

Answer

Quadruple the mass

Answer

Half the mass

Answer

Reduce the mass to one-fourth

Answer

Double the mass

Question 48

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

Answer

None of these

Answer

Drag force of air

Answer

Tension is string

Question 49

49. Hook’s law is defined as

Answer

F and X are direct proportional

Answer

F and X are inverse proportional

Answer

None of these

Answer

F and X has no relation

Question 50

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

Question 51

51. The restoring force applied on the pendulum

Answer

-mg sin θ

Answer

-mg cos θ

Question 52

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

Answer

Angular Motion

Answer

Circular Motion

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Question 53

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

Answer

The force on the particle is maximum at the ends

Answer

The acceleration is minimum at the mean position

Answer

The kinetic energy is maximum at the mean position

Answer

The potential energy is maximum at the mean position

Question 54

54. The waveform of simple harmonic motion will be

Answer

None of these

Answer

Saw tooth waveform

Answer

Square wave

Question 55

55. 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

Answer

Become infinite

Answer

Remain unaffected

Question 56

56. 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

Question 57

57. The damping depends upon

Answer

None of these

Question 58

58. S.I unit of frequency is

Answer

Vibration S¯²

Question 59

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

Answer

Both a and b

Answer

Extreme position

Answer

Mean position

Question 60

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

Answer

All of these

Question 61

61. The vibrating bodies produce

Answer

Disturbance

Answer

All of these

Question 62

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

Answer

Independent of x

Question 63

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

Answer

Amplitude, angular frequency, acceleration

Answer

Total energy, amplitude, angular frequency

Answer

Acceleration, force, total energy

Answer

Angular frequency, Acceleration, force

Question 64

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

Answer 173

Time period will depend on the weight of the boy.

Answer 174

Time period will increase

Answer 175

Time period will not change

Answer 176

Time period will decrease

Answer 177

X = X₀ cos ωt

Answer 178

X = X₀ sin ωt

Answer 179

None of these

Answer 180

X = X₀ cos (ωt + φ)

Answer 181

Difference between kinetic energy and potential energy

Answer 182

Potential energy

Answer 183

Phase difference between acceleration and displacement

Answer 184

Becomes zero

Answer 185

Remains constant

Answer 186

Becomes one half

Answer 187

Become on fourth

Answer 188

Remains same

Answer 189

Becomes Double

Answer 190

None of these

Answer 191

4 x amplitude

Answer 192

Square of amplitude

Answer 193

2 x amplitude

Answer 194

None of these

Answer 195

Doppler’s effect

Answer 196

Wavelength

Answer 197

Time period

Answer 198

Remains constant

Answer 199

Becomes zero

Answer 200

Remains constant

Answer 201

Becomes zero

Answer 202

P.E. = ½ KX₀²

Answer 203

P.E. = ½ KX²

Answer 204

P.E. = ½ K²X²

Answer 205

None of these

Answer 206

Half way between them

Answer 207

Crossing mean position

Answer 208

Displacement is maximum

Answer 209

Oscillation

Answer 210

The force on the particle is maximum at the ends

Answer 211

The kinetic energy is maximum at the mean position

Answer 212

The acceleration is minimum at the mean position

Answer 213

The potential energy is maximum at the mean position

Answer 214

P.E.max 1.2 KX₀²

Answer 215

None of these

Answer 216

P.E.max 1.2 KX²

Answer 217

P.E.max 1.2 K² X

Answer 218

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

Answer 219

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

Answer 220

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

Answer 221

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

Answer 222

Wave motion

Answer 223

Periodic motion

Answer 224

Rectilinear motion

Answer 225

Rotatory motion

Answer 226

System friction

Answer 227

Air resistance

Answer 228

Frictional support of the system

Answer 229

All of these

Answer 230

Angular Momentum

Answer 231

K.E. Energy

Answer 232

P.E. Energy

Answer 233

Total Energy

Answer 234

Driven harmonic vibration

Answer 235

Simple harmonic vibration

Answer 236

Free vibration

Answer 237

Natural vibration

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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