Physics Waves Online Mcqs Test

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Question 1

1. The gases have a

Answer

Smaller elastic modules

Answer

None of these

Answer

Large elastic modulus

Answer

Zero elastic modulus

Question 2

2. The distance between node and antinode is

Question 3

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

Answer

Out of phase

Answer

None of these

Answer

Sometimes in phase

Question 4

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

Answer

1/f seconds

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1/T seconds

Question 5

5. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

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Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Question 6

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

Answer

Zero in the mean position

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None of these

Answer

Maximum in the extreme position

Question 7

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

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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

Answer

There is a loss of energy

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There is a gain of energy

Question 8

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

Answer

Wave mechanics

Question 9

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

Answer

Electromagnetic waves

Answer

Mechanical waves

Answer

Carrier waves

Answer

Matter waves

Question 10

10. Silence zone takes place due to

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Constructive interference

Answer

Destructive interference

Question 11

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

Question 12

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

Answer

None of these

Answer

Wavelength

Question 13

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

Answer

An apparent decrease in wavelength

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No apparent change in frequency

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An apparent increase in frequency

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An apparent decrease in frequency

Question 14

14. 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 faster

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√6 times slower

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At correct rate

Question 15

15. Decibel is unit of

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Energy of radiation

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Sound loudness

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x-ray radiation capacity

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Intensity of light

Question 16

16. 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 17

17. 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 decrease

Answer

Time period will depend on the weight of the boy.

Answer

Time period will not change

Answer

Time period will increase

Question 18

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

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Progressive wave

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Transverse wave

Answer

Longitudinal waves

Answer

None of these

Question 19

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

Answer

1567 ms¯¹

Answer

1483 ms¯¹

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1214 ms¯¹

Answer

1343 ms¯¹

Question 20

20. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

Periodic waves

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Progressive waves

Answer

None of these

Question 21

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

Answer

Rectilinear Motion

Answer

Circular Motion

Answer

Angular Motion

Answer

Simple Harmonic Motion

Question 22

22. 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

Answer

Has a definite capacity

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Has a definite pitch

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Can penetrate the wall

Question 23

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

Answer

Quality factor is small

Answer

Damping force is small

Answer

Applied periodic force is small

Answer

Restoring force is small

Question 24

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

Answer

Ultra-violet rays

Answer

Gamma rays

Answer

Visible light

Answer

Infra-red radiation

Question 25

25. 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 26

26. 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 27

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

Answer

Neither pressure nor density

Answer

Pressure only

Answer

Both pressure and density

Answer

Density only

Question 28

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

Answer

Reverberation

Answer

Time period

Answer

Oscillation Time

Question 29

29. In stationary waves

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Question 30

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

Answer

Reflection

Answer

Refraction

Answer

Interference

Answer

Polarization

Question 31

31. In stationary waves

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Energy is maximum at nodes and minimum at antidotes

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antinodes

Question 32

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

Answer

4π second

Answer

2π second

Question 33

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

Answer

Remains constant

Answer

Becomes Zero

Question 34

34. 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 35

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

Answer

Wave length

Answer

Phase difference

Question 36

36. The velocity of sound is greatest in

Question 37

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

Answer

Cannot be diffracted

Answer

Cannot be polarized

Answer

Have a lower frequency

Answer

Do not affect photographic plate

Question 38

38. Energy is not carried by

Answer

Stationary waves

Answer

Transverse progressive waves

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Question 39

39. What sort of waves exhibit the Doppler effect?

Answer

Light waves

Answer

Water waves

Answer

All of these

Answer

Sound waves

Question 40

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

Answer

The composition of air

Answer

The atmospheric pressure

Answer

Temperature of air

Answer

Moisture contents in air

Question 41

41. 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 42

42. 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 43

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

Answer

Diffraction

Answer

Interference

Answer

Refraction

Answer

Polarization

Question 44

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

Question 45

45. 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 46

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

Answer

√k₁k₂

Answer

(k₁+k₂)/2

Answer

k₁ k₂/( k₁+k₂)

Question 47

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

Answer

Diffraction

Answer

Polarization

Answer

Refraction

Answer

Reflection

Question 48

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

Answer

3,000 to 6,000 Hz

Answer

4,000 to 8,000 Hz

Answer

2,000 to 4,000 Hz

Answer

5,000 to 11,000 Hz

Question 49

49. Velocity of sound in vacuum is

Question 50

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

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be every small

Answer

None of these

Answer

Amplitude of motion will be very large

Question 51

51. Sound waves do not travel in vacuum because

Answer

They are stationary waves

Answer

They do not have enough energy

Answer

They require material medium for propagation

Answer

They are transverse waves

Question 52

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

Question 53

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

Answer

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

Answer

When v is maximum, α is zero

Answer

When v is maximum, α is maximum

Answer

When v is zero, α is zero

Question 54

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

Answer

None of these

Answer

Extra supersonic speed

Answer

Supersonic speed

Answer

Sonic speed

Question 55

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

Question 56

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

Answer

Doppler effect

Answer

Interference of waves

Answer

All of these

Answer

Beats phenomena

Question 57

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

Answer

Independent of x

Question 58

58. Waves transmit _________ from one place to another

Answer

None of these

Question 59

59. 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

143 Nm¯¹

Answer

700 Nm¯¹

Answer

100 Nm¯¹

Question 60

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

Answer

None of these

Answer

Oscillation

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

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Answer

Double the mass

Answer

Half the mass

Question 63

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

Answer

Longitudinal progressive

Answer

Transverse stationary

Answer

Longitudinal stationary

Answer

Transverse progressive

Question 64

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

Answer 176

Density and elasticity of gas

Answer 177

Amplitude and frequency of sound

Answer 178

Wavelength of sound

Answer 179

Remain unaffected

Answer 180

Become infinite

Answer 181

Hyperbolic

Answer 182

Exponential

Answer 183

Logarithmic

Answer 184

The source is in motion

Answer 185

The detector is in motion

Answer 186

Both the above

Answer 187

None of these

Answer 188

Same as that of the individual waves

Answer 189

Half that of the individual waves

Answer 190

Twice that of the individual waves

Answer 191

√2 that of the individual waves

Answer 192

Becomes double

Answer 193

Become one fourth

Answer 194

Remains same

Answer 195

Becomes one half

Answer 196

Light wave only

Answer 197

Sound wave only

Answer 198

Both sound and light waves

Answer 199

Neither sound nor light wave

Answer 200

Diffraction of sound waves

Answer 201

Destructive interference

Answer 202

Polarization

Answer 203

Constrictive and destructive interference

Answer 204

Doppler effect

Answer 205

Interference

Answer 206

Beat phenomenon

Answer 207

Increases or decreases depending on the material

Answer 208

Remains same

Answer 209

Total Energy

Answer 210

P.E. Energy

Answer 211

K.E. Energy

Answer 212

Angular Momentum

Answer 213

A straight line

Answer 214

An ellipse

Answer 215

A hyperbola

Answer 216

None of these

Answer 217

Increased rapidly

Answer 218

Longitudinal

Answer 219

Transverse

Answer 220

Electromagnetic

Answer 221

Stationary

Answer 222

Frequency and number of harmonic

Answer 223

Intensity and frequency

Answer 224

Frequency and velocity

Answer 225

Intensity and velocity

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

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

Answer 229

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

Answer 230

Reproduction of original image

Answer 231

Reproduction of music

Answer 232

Reproduction of a CD from original copy

Answer 233

Reproduction of original sound

Answer 234

The inertia property but not on the elastic property

Answer 235

The elastic property as well as the inertia property

Answer 236

The elastic property but not on the inertia property

Answer 237

Neither the elastic property nor the inertia property

Answer 238

Different frequencies and same phase

Answer 239

Different frequencies and same amplitude

Answer 240

Different frequencies, same amplitude and same phase

Answer 241

Different frequencies

Answer 242

Remains unchanged

Answer 243

Becomes zero

Answer 244

√k₂/k₁

Answer 245

√k₁/k₂

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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