Physics Waves Online Mcqs Test

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Question 1

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

Answer

Transverse stationary

Answer

Transverse progressive

Answer

Longitudinal stationary

Answer

Longitudinal progressive

Question 2

2. 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 3

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

Question 4

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

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Remains constant

Answer

Becomes Zero

Question 5

5. In stationary waves

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Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antinodes

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Alternating maximum and minimum energy producing at nodes and antinodes

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Energy is maximum at nodes and minimum at antidotes

Question 6

6. Beats are the results of

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Destructive interference

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Answer

Polarization

Question 7

7. Velocity of sound in vacuum is

Question 8

8. 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 9

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

Question 10

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

Question 11

11. Fidelity refers to

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Reproduction of a CD from original copy

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Reproduction of music

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Reproduction of original sound

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Reproduction of original image

Question 12

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

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Do not affect photographic plate

Answer

Cannot be polarized

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Cannot be diffracted

Answer

Have a lower frequency

Question 13

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

Question 14

14. 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 15

15. 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 16

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

Answer

Twice that of the individual waves

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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

Question 17

17. 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 18

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

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Frequency and velocity

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Question 19

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

Answer

Refraction

Answer

Interference

Answer

Diffraction

Answer

Polarization

Question 20

20. 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

5α – 4β

Answer

5 β – 4 α

Answer

9 (β – α)

Question 21

21. Energy is not carried by

Answer

Electromagnetic waves

Answer

Stationary waves

Answer

Transverse progressive waves

Answer

Longitudinal vibration

Question 22

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

Answer

An apparent increase in frequency

Answer

No apparent change in frequency

Answer

An apparent decrease in wavelength

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An apparent decrease in frequency

Question 23

23. Waves transmit _________ from one place to another

Answer

None of these

Question 24

24. The velocity of sound in air depends upon

Answer

Amplitude and frequency of sound

Answer

Wavelength of sound

Answer

Density and elasticity of gas

Question 25

25. 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 increase

Answer

Time period will not change

Answer

Time period will depend on the weight of the boy.

Question 26

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

Answer

Zero in the mean position

Answer

None of these

Answer

Maximum in the extreme position

Question 27

27. 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

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Question 28

28. The Doppler effect is produced if

Answer

The source is in motion

Answer

The detector is in motion

Answer

Both the above

Answer

None of these

Question 29

29. The gases have a

Answer

Smaller elastic modules

Answer

None of these

Answer

Zero elastic modulus

Answer

Large elastic modulus

Question 30

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

Answer

Wave mechanics

Question 31

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

Answer

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 loss of energy

Answer

There is a gain of energy

Question 32

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

Question 33

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

Answer

Interference

Answer

Beat phenomenon

Answer

Doppler effect

Question 34

34. In simple harmonic motion,

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

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

Answer

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

Question 35

35. 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 36

36. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 37

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

Answer

Logarithmic

Answer

Hyperbolic

Answer

Exponential

Question 38

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

Answer

Doppler effect

Answer

All of these

Answer

Beats phenomena

Answer

Interference of waves

Question 39

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

Answer

Reduce the mass to one fourth

Answer

Half the mass

Answer

Double the mass

Answer

Quadruple the mass

Question 40

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

Answer

Diffraction

Answer

Reflection

Answer

Polarization

Answer

Refraction

Question 41

41. For production of beats the two sources must have

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies

Question 42

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

Answer

Sometimes in phase

Answer

Out of phase

Answer

None of these

Question 43

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

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Answer

Angular Motion

Answer

Circular Motion

Question 44

44. 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 45

45. Doppler-effect applies to

Answer

Both sound and light waves

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Sound wave only

Question 46

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

Answer

Wavelength

Answer

None of these

Question 47

47. 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

Can penetrate the wall

Answer

Has a definite capacity

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Has a definite pitch

Question 48

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

Answer

A hyperbola

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A straight line

Answer

An ellipse

Question 49

49. 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 50

50. The velocity of sound is greatest in

Question 51

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

Answer

None of these

Answer

Oscillation

Question 52

52. What sort of waves exhibit the Doppler effect?

Answer

Sound waves

Answer

All of these

Answer

Water waves

Answer

Light waves

Question 53

53. In vibratory motion which parameter remains constant?

Answer

Total Energy

Answer

Angular Momentum

Answer

P.E. Energy

Answer

K.E. Energy

Question 54

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

Answer

Polarization

Answer

Refraction

Answer

Interference

Answer

Reflection

Question 55

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

Answer

None of these

Answer

Amplitude of motion will be every small

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be very large

Question 56

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

Question 57

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

Answer

Extra supersonic speed

Answer

None of these

Answer

Supersonic speed

Answer

Sonic speed

Question 58

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

Question 59

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

Answer

1214 ms¯¹

Answer

1483 ms¯¹

Answer

1343 ms¯¹

Answer

1567 ms¯¹

Question 60

60. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 61

61. 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 62

62. 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 63

63. 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 64

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

Answer

Remains unchanged

Answer

Becomes zero

Answer 176

Increases or decreases depending on the material

Answer 177

Remains same

Answer 178

Mechanical waves

Answer 179

Carrier waves

Answer 180

Electromagnetic waves

Answer 181

Matter waves

Answer 182

Progressive waves

Answer 183

Periodic waves

Answer 184

Mechanical waves

Answer 185

None of these

Answer 186

When v is maximum, α is zero

Answer 187

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

Answer 188

When v is zero, α is zero

Answer 189

When v is maximum, α is maximum

Answer 190

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 191

Energy is minimum at nodes and maximum at antinodes

Answer 192

Energy is minimum at nodes and maximum at antidotes

Answer 193

Energy is uniformly distributed

Answer 194

Density only

Answer 195

Both pressure and density

Answer 196

Neither pressure nor density

Answer 197

Pressure only

Answer 198

Applied periodic force is small

Answer 199

Restoring force is small

Answer 200

Damping force is small

Answer 201

Quality factor is small

Answer 202

Electromagnetic

Answer 203

Longitudinal

Answer 204

Stationary

Answer 205

Transverse

Answer 206

√k₁/k₂

Answer 207

√k₂/k₁

Answer 208

Phase difference

Answer 209

Wave length

Answer 210

Become zero

Answer 211

Remains same

Answer 212

x-ray radiation capacity

Answer 213

Intensity of light

Answer 214

Energy of radiation

Answer 215

Sound loudness

Answer 216

2π second

Answer 217

4π second

Answer 218

Reverberation

Answer 219

Oscillation Time

Answer 220

Time period

Answer 221

Independent of x

Answer 222

The inertia property but not on the elastic property

Answer 223

Neither the elastic property nor the inertia property

Answer 224

The elastic property as well as the inertia property

Answer 225

The elastic property but not on the inertia property

Answer 226

None of these

Answer 227

Increased rapidly

Answer 228

None of these

Answer 229

Transverse wave

Answer 230

Progressive wave

Answer 231

Longitudinal waves

Answer 232

Becomes double

Answer 233

Becomes one half

Answer 234

Become one fourth

Answer 235

Remains same

Answer 236

They do not have enough energy

Answer 237

They are transverse waves

Answer 238

They require material medium for propagation

Answer 239

They are stationary waves

Answer 240

The composition of air

Answer 241

Temperature of air

Answer 242

Moisture contents in air

Answer 243

The atmospheric pressure

Answer 244

1/T seconds

Answer 245

1/f seconds

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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Important Waves Question and Answer

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Malik Tahir

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