Physics Waves Online Mcqs Test

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Question 1

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

Answer

Reduce the mass to one fourth

Answer

Quadruple the mass

Answer

Double the mass

Answer

Half the mass

Question 2

2. Two particles A and B of equal masses are suspended from two mass less springs of spring constants k₁ and k₂ respectively. If the maximum velocities, during oscillation, are equal, the ratio of amplitudes of A and B is:

Answer

√k₂/k₁

Answer

√k₁/k₂

Question 3

3. A spring-mass system oscillates with a frequency v, if it is taken in an elevator slowly accelerating upward, the frequency will

Answer

Become zero

Answer

Remains same

Question 4

4. The velocity of sound in air not affected by changes in:

Answer

Moisture contents in air

Answer

The composition of air

Answer

Temperature of air

Answer

The atmospheric pressure

Question 5

5. 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?

Answer

Time period will not change

Answer

Time period will increase

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Time period will decrease

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Time period will depend on the weight of the boy.

Question 6

6. When two identical traveling waves are superimposed, the velocity of the resultant wave

Answer

Remains unchanged

Answer

Becomes zero

Question 7

7. The beats frequency (sensible) for a human car is

Question 8

8. Decibel is unit of

Answer

Intensity of light

Answer

Energy of radiation

Answer

x-ray radiation capacity

Answer

Sound loudness

Question 9

9. A body with frequency f would complete one vibration in

Answer

1/f seconds

Answer

1/T seconds

Question 10

10. 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

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Remain unaffected

Question 11

11. When a stationary wave is formed then its frequency is

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Same as that of the individual waves

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Half that of the individual waves

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√2 that of the individual waves

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Twice that of the individual waves

Question 12

12. If is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice.

Answer

Has a definite pitch

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Can penetrate the wall

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Has a definite quality

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Has a definite capacity

Question 13

13. Applications of the results of scientific studies in the designs of buildings etc. is called:

Answer

Wave mechanics

Question 14

14. When two waves with same frequency and constant phase difference interfere.

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There is a loss of energy

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The energy is redistributed and the distribution changes with time

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There is a gain of energy

Answer

The energy is redistributed and the distribution remains constant with time

Question 15

15. What is frequency of radio waves transmitted by a station, if the wavelength of these waves is 300 m?

Question 16

16. If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

Question 17

17. Which phenomena can be applied to estimate the velocity of star with respect to earth?

Answer

Beats phenomena

Answer

Doppler effect

Answer

All of these

Answer

Interference of waves

Question 18

18. One spring has force constant 200 Nm¯¹, another has force constant 500 Nm¯¹. If they are joined in series, the force constant will be nearest to

Answer

300 Nm¯¹

Answer

100 Nm¯¹

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Question 19

19. Which one of the following statements is true for the speed v and the acceleration α of a particle executing simple harmonic motion?

Answer

When v is zero, α is zero

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Value of α is zero, whatever may be the value of v

Answer

When v is maximum, α is maximum

Answer

When v is maximum, α is zero

Question 20

20. A mass m attached to a spring oscillate every 2 sec. If the mass increases by 2 kg, then time period increases by 1 sec. The initial mass of the body is:

Question 21

21. Which one is not produce by sound waves in air?

Answer

Diffraction

Answer

Refraction

Answer

Polarization

Answer

Reflection

Question 22

22. The velocity of sound in air depends upon

Answer

Density and elasticity of gas

Answer

Wavelength of sound

Answer

Amplitude and frequency of sound

Question 23

23. When a gas is heated at constant pressure, its volume is increased and its density

Answer

None of these

Answer

Increased rapidly

Question 24

24. The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

Question 25

25. The distance between node and antinode is

Question 26

26. Sound waves do not travel in vacuum because

Answer

They are transverse waves

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They do not have enough energy

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They require material medium for propagation

Answer

They are stationary waves

Question 27

27. When the source of sound moves away form a stationary listener then _________ occurs.

Answer

No apparent change in frequency

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An apparent increase in frequency

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An apparent decrease in wavelength

Answer

An apparent decrease in frequency

Question 28

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

Answer

Circular Motion

Answer

Simple Harmonic Motion

Answer

Angular Motion

Answer

Rectilinear Motion

Question 29

29. In vibratory motion which parameter remains constant?

Answer

Total Energy

Answer

Angular Momentum

Answer

P.E. Energy

Answer

K.E. Energy

Question 30

30. With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

Answer

Energy, momentum and mass

Answer

Energy and mass

Answer

Energy and linear momentum

Question 31

31. The waves that require a material medium for their propagation are called

Answer

Mechanical waves

Answer

Electromagnetic waves

Answer

Matter waves

Answer

Carrier waves

Question 32

32. Fidelity refers to

Answer

Reproduction of music

Answer

Reproduction of original image

Answer

Reproduction of original sound

Answer

Reproduction of a CD from original copy

Question 33

33. For production of beats the two sources must have

Answer

Different frequencies and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies

Question 34

34. To hear a clear echo, the reflecting surface must be at a minimum distance of

Question 35

35. The response of the human ear to the loudness of sound is _________ in nature:

Answer

Logarithmic

Answer

Exponential

Answer

Hyperbolic

Question 36

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

Answer

Independent of x

Question 37

37. Beats are the results of

Answer

Polarization

Answer

Constrictive and destructive interference

Answer

Destructive interference

Answer

Diffraction of sound waves

Question 38

38. A sound source is moving towards stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is

Question 39

39. The speed of sound in a medium depends on

Answer

The elastic property but not on the inertia property

Answer

Neither the elastic property nor the inertia property

Answer

The inertia property but not on the elastic property

Answer

The elastic property as well as the inertia property

Question 40

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

Answer

Crossing mean position

Answer

Half way between them

Answer

Displacement is maximum

Question 41

41. If two waves of amplitude ‘A’ produce a resultant wave of amplitude A, then the phase difference between them will be

Question 42

42. A particle executes a simple harmonic motion of time period T. Find the time taken by the particle to go directly from its mean position to half the amplitude

Question 43

43. The velocity of sound is greatest in

Question 44

44. It is possible to distinguish between transverse and longitudinal waves form the property of

Answer

Diffraction

Answer

Interference

Answer

Polarization

Answer

Refraction

Question 45

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

Answer

Remains constant

Answer

Becomes Zero

Question 46

46. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Mechanical waves

Answer

None of these

Answer

Periodic waves

Question 47

47. 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 48

48. A pendulum clock that keeps correct time on the Earth is taken to the Moon. It will run

Answer

6 times faster

Answer

At correct rate

Answer

√6 times slower

Answer

√6 times faster

Question 49

49. When temperature increases, the frequency of a tuning fork

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 50

50. 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/( k₁+k₂)

Answer

(k₁+k₂)/2

Answer

√k₁k₂

Question 51

51. Through which character we can distinguish the light waves from sound waves

Answer

Interference

Answer

Polarization

Answer

Refraction

Answer

Reflection

Question 52

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

Question 53

53. Which of the following changes at an antinode is a stationary wave?

Answer

Density only

Answer

Both pressure and density

Answer

Pressure only

Answer

Neither pressure nor density

Question 54

54. Doppler-effect applies to

Answer

Both sound and light waves

Answer

Light wave only

Answer

Sound wave only

Answer

Neither sound nor light wave

Question 55

55. Energy is not carried by

Answer

Transverse progressive waves

Answer

Stationary waves

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Question 56

56. The loudness and pitch of a sound note depends on

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Answer

Intensity and velocity

Answer

Frequency and velocity

Question 57

57. The distance between any two consecutive crests or troughs is called

Answer

Wave length

Answer

Phase difference

Question 58

58. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 59

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

Answer

Applied periodic force is small

Answer

Restoring force is small

Answer

Damping force is small

Answer

Quality factor is small

Question 60

60. Waves transmit _________ from one place to another

Answer

None of these

Question 61

61. A wave is which the displacement of the wave travel perpendicular to the direction of propagation of waves is called

Answer

None of these

Answer

Transverse wave

Answer

Longitudinal waves

Answer

Progressive wave

Question 62

62. Which one of the following instances are the waves plane-polarized?

Answer

Infra-red radiation

Answer

Ultra-violet rays

Answer

Visible light

Answer

Gamma rays

Question 63

63. Waves disturbances may also come in a concentrated bundles like stock waves from an airplane flying at:

Answer

Supersonic speed

Answer

None of these

Answer

Sonic speed

Answer

Extra supersonic speed

Question 64

64. One wavelength is the distance covered in a time is called

Answer

Oscillation Time

Answer

Time period

Answer

Reverberation

Answer 170

Out of phase

Answer 171

Sometimes in phase

Answer 172

None of these

Answer 173

3,000 to 6,000 Hz

Answer 174

2,000 to 4,000 Hz

Answer 175

4,000 to 8,000 Hz

Answer 176

5,000 to 11,000 Hz

Answer 177

Light waves

Answer 178

Water waves

Answer 179

Sound waves

Answer 180

All of these

Answer 181

4π second

Answer 182

2π second

Answer 183

5 β – 4 α

Answer 184

9 (β – α)

Answer 185

5α – 4β

Answer 186

Amplitude of motion will be very large

Answer 187

Independent of amplitude of motion

Answer 188

Amplitude of motion will be every small

Answer 189

None of these

Answer 190

Maximum in the extreme position

Answer 191

None of these

Answer 192

Zero in the mean position

Answer 193

Cannot be diffracted

Answer 194

Have a lower frequency

Answer 195

Cannot be polarized

Answer 196

Do not affect photographic plate

Answer 197

Both the above

Answer 198

The source is in motion

Answer 199

None of these

Answer 200

The detector is in motion

Answer 201

A straight line

Answer 202

A hyperbola

Answer 203

An ellipse

Answer 204

None of these

Answer 205

Large elastic modulus

Answer 206

Zero elastic modulus

Answer 207

Smaller elastic modules

Answer 208

Becomes double

Answer 209

Remains same

Answer 210

Become one fourth

Answer 211

Becomes one half

Answer 212

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

Answer 213

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

Answer 214

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

Answer 215

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

Answer 216

Energy is maximum at nodes and minimum at antidotes

Answer 217

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 218

Energy is minimum at nodes and maximum at antinodes

Answer 219

Energy is uniformly distributed

Answer 220

Energy is minimum at nodes and maximum at antinodes

Answer 221

Energy is minimum at nodes and maximum at antidotes

Answer 222

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 223

Energy is uniformly distributed

Answer 224

Longitudinal progressive

Answer 225

Longitudinal stationary

Answer 226

Transverse stationary

Answer 227

Transverse progressive

Answer 228

Vibration harmonic oscillator

Answer 229

Driven harmonic oscillator

Answer 230

Frequency harmonic oscillator

Answer 231

1343 ms¯¹

Answer 232

1214 ms¯¹

Answer 233

1567 ms¯¹

Answer 234

1483 ms¯¹

Answer 235

Beat phenomenon

Answer 236

Doppler effect

Answer 237

Interference

Answer 238

Oscillation

Answer 239

None of these

Answer 240

Stationary

Answer 241

Transverse

Answer 242

Electromagnetic

Answer 243

Longitudinal

Answer 244

Wavelength

Answer 245

None of these

Total Questions:	94
Time Allowed:	40 Minutes
Total Marks:	94
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Malik Tahir

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