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

Answer

Interference

Answer

Diffraction

Answer

Polarization

Answer

Refraction

Question 3

3. 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

Can penetrate the wall

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Has a definite pitch

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Has a definite quality

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Has a definite capacity

Question 4

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

Answer

√6 times faster

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√6 times slower

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6 times faster

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At correct rate

Question 5

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

Answer

Refraction

Answer

Polarization

Answer

Diffraction

Answer

Reflection

Question 6

6. Speed of sound in Water at 20°C is:

Answer

1343 ms¯¹

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1567 ms¯¹

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1214 ms¯¹

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1483 ms¯¹

Question 7

7. 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 linear momentum

Answer

Energy and mass

Question 8

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

Answer

5,000 to 11,000 Hz

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3,000 to 6,000 Hz

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2,000 to 4,000 Hz

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4,000 to 8,000 Hz

Question 9

9. 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 10

10. Doppler-effect applies to

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Neither sound nor light wave

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Sound wave only

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Both sound and light waves

Answer

Light wave only

Question 11

11. The distance between two consecutive crests or trough is called

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Wavelength

Answer

None of these

Question 12

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

Answer

An apparent increase in frequency

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An apparent decrease in frequency

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No apparent change in frequency

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An apparent decrease in wavelength

Question 13

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

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Independent of x

Question 14

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

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Remains unchanged

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Becomes zero

Question 15

15. Beats are the results of

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Destructive interference

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Constrictive and destructive interference

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Polarization

Answer

Diffraction of sound waves

Question 16

16. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

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Total Energy

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P.E. Energy

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K.E. Energy

Question 17

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

Answer

None of these

Answer

Oscillation

Question 18

18. If the period of oscillation of mass m suspended from a spring is one second, then the period of 4 m will be:

Question 19

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

Answer

Reverberation

Answer

Time period

Answer

Oscillation Time

Question 20

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

Answer

Logarithmic

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Hyperbolic

Answer

Exponential

Question 21

21. 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 22

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

Answer

Temperature of air

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Moisture contents in air

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The atmospheric pressure

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The composition of air

Question 23

23. 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 24

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

Answer

Phase difference

Answer

Wave length

Question 25

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

Question 26

26. Ultra Violet rays differ X rays in that ultra violet rays

Answer

Cannot be polarized

Answer

Have a lower frequency

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Cannot be diffracted

Answer

Do not affect photographic plate

Question 27

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

Answer

Crossing mean position

Answer

Displacement is maximum

Answer

Half way between them

Question 28

28. The Doppler effect is produced if

Answer

The source is in motion

Answer

Both the above

Answer

None of these

Answer

The detector is in motion

Question 29

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

Answer

Restoring force is small

Answer

Quality factor is small

Answer

Damping force is small

Answer

Applied periodic force is small

Question 30

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

Question 31

31. Fidelity refers to

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Reproduction of original sound

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Reproduction of original image

Answer

Reproduction of music

Answer

Reproduction of a CD from original copy

Question 32

32. Decibel is unit of

Answer

Sound loudness

Answer

Energy of radiation

Answer

x-ray radiation capacity

Answer

Intensity of light

Question 33

33. What sort of waves exhibit the Doppler effect?

Answer

Light waves

Answer

Water waves

Answer

Sound waves

Answer

All of these

Question 34

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 35

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

Answer

Circular Motion

Answer

Simple Harmonic Motion

Answer

Rectilinear Motion

Answer

Angular Motion

Question 36

36. The velocity of sound is greatest in

Question 37

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

Answer

Gamma rays

Answer

Ultra-violet rays

Answer

Infra-red radiation

Answer

Visible light

Question 38

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

Answer

Remains same

Answer

Become zero

Question 39

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

Answer

Pressure only

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Density only

Answer

Neither pressure nor density

Answer

Both pressure and density

Question 40

40. In stationary waves

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Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Question 41

41. For production of beats the two sources must have

Answer

Different frequencies

Answer

Different frequencies and same amplitude

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same phase

Question 42

42. The gases have a

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Answer

None of these

Question 43

43. The speed of sound in a medium depends on

Answer

The elastic property but not on the inertia property

Answer

The elastic property as well as the inertia property

Answer

The inertia property but not on the elastic property

Answer

Neither the elastic property nor the inertia property

Question 44

44. 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

5α – 4β

Answer

9 (β – α)

Question 45

45. 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 46

46. 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 47

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

Answer

1/T seconds

Answer

1/f seconds

Question 48

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

Answer

4π second

Answer

2π second

Question 49

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

Answer

All of these

Answer

Doppler effect

Answer

Beats phenomena

Answer

Interference of waves

Question 50

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

Answer

Supersonic speed

Answer

Extra supersonic speed

Answer

Sonic speed

Answer

None of these

Question 51

51. 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

Answer

(k₁+k₂)/2

Question 52

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

Question 53

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

Answer

Remains constant

Answer

Becomes Zero

Question 54

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

Answer

Sometimes in phase

Answer

None of these

Answer

Out of phase

Question 55

55. An oscillating mass-spring system generates

Answer

Mechanical waves

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Progressive waves

Answer

None of these

Answer

Periodic waves

Question 56

56. 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 depend on the weight of the boy.

Answer

Time period will decrease

Answer

Time period will not change

Question 57

57. 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 58

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

Answer

Increased rapidly

Answer

None of these

Question 59

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

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There is a gain of energy

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There is a loss of energy

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The energy is redistributed and the distribution remains constant with time

Answer

The energy is redistributed and the distribution changes with time

Question 60

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

Question 61

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

Question 62

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

Answer

Wave mechanics

Question 63

63. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

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They require material medium for propagation

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They are transverse waves

Answer

They are stationary waves

Question 64

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

Answer 172

Longitudinal waves

Answer 173

None of these

Answer 174

Progressive wave

Answer 175

Transverse wave

Answer 176

A hyperbola

Answer 177

A straight line

Answer 178

An ellipse

Answer 179

Doppler effect

Answer 180

Interference

Answer 181

Beat phenomenon

Answer 182

Frequency and velocity

Answer 183

Frequency and number of harmonic

Answer 184

Intensity and frequency

Answer 185

Intensity and velocity

Answer 186

Reflection

Answer 187

Interference

Answer 188

Refraction

Answer 189

Polarization

Answer 190

Maximum in the extreme position

Answer 191

Zero in the mean position

Answer 192

None of these

Answer 193

Same as that of the individual waves

Answer 194

Twice that of the individual waves

Answer 195

Half that of the individual waves

Answer 196

√2 that of the individual waves

Answer 197

Stationary

Answer 198

Longitudinal

Answer 199

Transverse

Answer 200

Electromagnetic

Answer 201

Carrier waves

Answer 202

Electromagnetic waves

Answer 203

Mechanical waves

Answer 204

Matter waves

Answer 205

Energy is maximum at nodes and minimum at antidotes

Answer 206

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 207

Energy is minimum at nodes and maximum at antinodes

Answer 208

Energy is uniformly distributed

Answer 209

Transverse progressive

Answer 210

Longitudinal stationary

Answer 211

Transverse stationary

Answer 212

Longitudinal progressive

Answer 213

Independent of amplitude of motion

Answer 214

Amplitude of motion will be every small

Answer 215

None of these

Answer 216

Amplitude of motion will be very large

Answer 217

None of these

Answer 218

Become infinite

Answer 219

Remain unaffected

Answer 220

Longitudinal vibration

Answer 221

Electromagnetic waves

Answer 222

Stationary waves

Answer 223

Transverse progressive waves

Answer 224

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

Answer 225

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

Answer 226

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

Answer 227

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

Answer 228

When v is maximum, α is maximum

Answer 229

When v is zero, α is zero

Answer 230

When v is maximum, α is zero

Answer 231

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

Answer 232

Remains same

Answer 233

Becomes one half

Answer 234

Become one fourth

Answer 235

Becomes double

Answer 236

Amplitude and frequency of sound

Answer 237

Wavelength of sound

Answer 238

Density and elasticity of gas

Answer 239

Half the mass

Answer 240

Double the mass

Answer 241

Quadruple the mass

Answer 242

Reduce the mass to one fourth

Answer 243

Vibration harmonic oscillator

Answer 244

Frequency harmonic oscillator

Answer 245

Driven harmonic oscillator

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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