Physics Waves Online Mcqs Test

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Question 1

1. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 2

2. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

Periodic waves

Answer

None of these

Answer

Progressive waves

Question 3

3. The velocity of sound in air depends upon

Answer

Density and elasticity of gas

Answer

Amplitude and frequency of sound

Answer

Wavelength of sound

Question 4

4. Waves transmit _________ from one place to another

Answer

None of these

Question 5

5. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 6

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

Answer

There is a loss of energy

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The energy is redistributed and the distribution changes with time

Answer

The energy is redistributed and the distribution remains constant with time

Answer

There is a gain of energy

Question 7

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

Answer

Independent of x

Question 8

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

Question 9

9. 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

Remain unaffected

Answer

Become infinite

Question 10

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

Answer

Double the mass

Answer

Quadruple the mass

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Half the mass

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Reduce the mass to one fourth

Question 11

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

Answer

Visible light

Answer

Infra-red radiation

Answer

Gamma rays

Answer

Ultra-violet rays

Question 12

12. 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

√k₁k₂

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(k₁+k₂)/2

Question 13

13. Reflection of radar waves from the aero planes is an example of

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Interference

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Doppler effect

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Beat phenomenon

Question 14

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

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Carrier waves

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Mechanical waves

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Matter waves

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Electromagnetic waves

Question 15

15. In stationary waves

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Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

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Energy is minimum at nodes and maximum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Question 16

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

Answer

Wave mechanics

Question 17

17. Fidelity refers to

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Reproduction of original image

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Reproduction of a CD from original copy

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Reproduction of music

Answer

Reproduction of original sound

Question 18

18. For production of beats the two sources must have

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Different frequencies and same amplitude

Answer

Different frequencies

Answer

Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Question 19

19. In simple harmonic motion,

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

Answer

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

Answer

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

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

Question 20

20. Doppler-effect applies to

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Sound wave only

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Light wave only

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Neither sound nor light wave

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Both sound and light waves

Question 21

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

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√6 times slower

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√6 times faster

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At correct rate

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6 times faster

Question 22

22. For motion of a simple pendulum to be simple harmonic

Answer

Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be every small

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Amplitude of motion will be very large

Question 23

23. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Question 24

24. Maximum acceleration of an object in simple harmonic motion is 24 m/s² and maximum velocity is 16 m/sec. Then amplitude of SHM is

Question 25

25. Sound waves in air always

Answer

Electromagnetic

Answer

Longitudinal

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Stationary

Answer

Transverse

Question 26

26. Decibel is unit of

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Sound loudness

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Intensity of light

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x-ray radiation capacity

Answer

Energy of radiation

Question 27

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

Question 28

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

Question 29

29. Velocity of sound in vacuum is

Question 30

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

Answer

None of these

Answer

Increased rapidly

Question 31

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

Question 32

32. ‘y’ is the ratio molar specific heat at constant pressure to the molar specific heat at constant volume and has value

Question 33

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

Answer

Hyperbolic

Answer

Exponential

Answer

Logarithmic

Question 34

34. The waves moving from a sitar to a listener in air are

Answer

Longitudinal progressive

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Longitudinal stationary

Answer

Transverse progressive

Answer

Transverse stationary

Question 35

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

Answer

Polarization

Answer

Refraction

Answer

Interference

Answer

Diffraction

Question 36

36. 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 quality

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Can penetrate the wall

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Has a definite capacity

Answer

Has a definite pitch

Question 37

37. The length of the second’s pendulum on the surface of Earth is 1m. Its length on the surface of moon, where g is 1/6th the value of g on the surface of Earth, is:

Question 38

38. 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 39

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

Question 40

40. The gases have a

Answer

None of these

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Question 41

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

Answer

Rectilinear Motion

Answer

Circular Motion

Answer

Simple Harmonic Motion

Answer

Angular Motion

Question 42

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

Answer

Wave length

Answer

Phase difference

Question 43

43. 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 increase

Answer

Time period will decrease

Answer

Time period will depend on the weight of the boy.

Answer

Time period will not change

Question 44

44. Sound waves do not travel in vacuum because

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They are stationary waves

Answer

They require material medium for propagation

Answer

They do not have enough energy

Answer

They are transverse waves

Question 45

45. The length of a spring is ‘α’ when a force of 4N is applied on it. The length is β when 5N force is applied. Then the length of spring when 9N force is applied is

Answer

5 β – 4 α

Answer

9 (β – α)

Answer

5α – 4β

Question 46

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

Answer

Same as that of the individual waves

Answer

Twice that of the individual waves

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Half that of the individual waves

Answer

√2 that of the individual waves

Question 47

47. The velocity of sound is greatest in

Question 48

48. 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

100 Nm¯¹

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Answer

300 Nm¯¹

Question 49

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

Answer

Half way between them

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Displacement is maximum

Answer

Crossing mean position

Question 50

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

Answer

Energy and linear momentum

Answer

Energy, momentum and mass

Answer

Energy and mass

Question 51

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

Answer

The atmospheric pressure

Answer

Moisture contents in air

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The composition of air

Answer

Temperature of air

Question 52

52. The human ear is most sensitive in the frequency range of:

Answer

5,000 to 11,000 Hz

Answer

3,000 to 6,000 Hz

Answer

4,000 to 8,000 Hz

Answer

2,000 to 4,000 Hz

Question 53

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

Answer

Oscillation

Answer

None of these

Question 54

54. 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 55

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

Answer

Sonic speed

Answer

Extra supersonic speed

Answer

None of these

Answer

Supersonic speed

Question 56

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

Answer

Reverberation

Answer

Time period

Answer

Oscillation Time

Question 57

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

Answer

Reflection

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Refraction

Answer

Interference

Answer

Polarization

Question 58

58. Velocity of sound in vacuum (in m/s) is

Question 59

59. 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 60

60. The points at which the distance separated by λ, 2λ, 3λ, ........ are

Answer

None of these

Answer

Out of phase

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Sometimes in phase

Question 61

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

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Become one fourth

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Remains same

Answer

Becomes one half

Answer

Becomes double

Question 62

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

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2π second

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4π second

Question 63

63. The distance between node and antinode is

Question 64

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

Answer

Remains constant

Answer

Becomes Zero

Answer 170

Wavelength

Answer 171

None of these

Answer 172

Interference of waves

Answer 173

Doppler effect

Answer 174

All of these

Answer 175

Beats phenomena

Answer 176

Becomes zero

Answer 177

Remains unchanged

Answer 178

Total Energy

Answer 179

Angular Momentum

Answer 180

P.E. Energy

Answer 181

K.E. Energy

Answer 182

1214 ms¯¹

Answer 183

1483 ms¯¹

Answer 184

1343 ms¯¹

Answer 185

1567 ms¯¹

Answer 186

Transverse progressive waves

Answer 187

Longitudinal vibration

Answer 188

Electromagnetic waves

Answer 189

Stationary waves

Answer 190

None of these

Answer 191

Maximum in the extreme position

Answer 192

Zero in the mean position

Answer 193

The elastic property but not on the inertia property

Answer 194

The inertia property but not on the elastic property

Answer 195

The elastic property as well as the inertia property

Answer 196

Neither the elastic property nor the inertia property

Answer 197

Remains same

Answer 198

Increases or decreases depending on the material

Answer 199

Remains same

Answer 200

Become zero

Answer 201

Energy is uniformly distributed

Answer 202

Energy is maximum at nodes and minimum at antidotes

Answer 203

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 204

Energy is minimum at nodes and maximum at antinodes

Answer 205

An ellipse

Answer 206

A hyperbola

Answer 207

A straight line

Answer 208

Both the above

Answer 209

The detector is in motion

Answer 210

The source is in motion

Answer 211

None of these

Answer 212

An apparent decrease in frequency

Answer 213

An apparent decrease in wavelength

Answer 214

No apparent change in frequency

Answer 215

An apparent increase in frequency

Answer 216

Sound waves

Answer 217

Water waves

Answer 218

Light waves

Answer 219

All of these

Answer 220

When v is maximum, α is zero

Answer 221

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

Answer 222

When v is zero, α is zero

Answer 223

When v is maximum, α is maximum

Answer 224

1/T seconds

Answer 225

1/f seconds

Answer 226

Transverse wave

Answer 227

None of these

Answer 228

Longitudinal waves

Answer 229

Progressive wave

Answer 230

Polarization

Answer 231

Diffraction

Answer 232

Refraction

Answer 233

Reflection

Answer 234

Frequency and velocity

Answer 235

Intensity and velocity

Answer 236

Frequency and number of harmonic

Answer 237

Intensity and frequency

Answer 238

Pressure only

Answer 239

Neither pressure nor density

Answer 240

Both pressure and density

Answer 241

Density only

Answer 242

Do not affect photographic plate

Answer 243

Cannot be diffracted

Answer 244

Have a lower frequency

Answer 245

Cannot be polarized

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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