Physics Waves Online Mcqs Test

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Question 1

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

Answer

Intensity and velocity

Answer

Frequency and velocity

Answer

Frequency and number of harmonic

Answer

Intensity and frequency

Question 2

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

Answer

Reduce the mass to one fourth

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Quadruple the mass

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Half the mass

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Double the mass

Question 3

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

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Wavelength

Answer

None of these

Question 4

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

Answer

Wave length

Answer

Phase difference

Question 5

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

Answer

Interference of waves

Answer

Doppler effect

Answer

All of these

Answer

Beats phenomena

Question 6

6. The distance between node and antinode is

Question 7

7. 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 8

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

Answer

Logarithmic

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Hyperbolic

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Exponential

Question 9

9. The velocity of sound is greatest in

Question 10

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

Question 11

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

Answer

Amplitude of motion will be very large

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Independent of amplitude of motion

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Amplitude of motion will be every small

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None of these

Question 12

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

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Sometimes in phase

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None of these

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Out of phase

Question 13

13. 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 capacity

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Has a definite pitch

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Can penetrate the wall

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Has a definite quality

Question 14

14. 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 15

15. Velocity of sound in vacuum is

Question 16

16. For production of beats the two sources must have

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Different frequencies and same phase

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Different frequencies

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Different frequencies and same amplitude

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Different frequencies, same amplitude and same phase

Question 17

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

Answer

Diffraction

Answer

Polarization

Answer

Interference

Answer

Refraction

Question 18

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

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Transverse progressive

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Longitudinal stationary

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Longitudinal progressive

Answer

Transverse stationary

Question 19

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

Question 20

20. 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)/2

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√k₁k₂

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k₁ k₂/( k₁+k₂)

Question 21

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

Answer

Remains unchanged

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Becomes zero

Question 22

22. Energy is not carried by

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Electromagnetic waves

Answer

Stationary waves

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Longitudinal vibration

Answer

Transverse progressive waves

Question 23

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

Answer

Reverberation

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Time period

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Oscillation Time

Question 24

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

Answer

Infra-red radiation

Answer

Gamma rays

Answer

Ultra-violet rays

Answer

Visible light

Question 25

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

Answer

Become one fourth

Answer

Becomes double

Answer

Becomes one half

Answer

Remains same

Question 26

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

Answer

An apparent decrease in wavelength

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An apparent increase in frequency

Answer

No apparent change in frequency

Answer

An apparent decrease in frequency

Question 27

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

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Matter waves

Answer

Mechanical waves

Answer

Carrier waves

Answer

Electromagnetic waves

Question 28

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

Answer

Displacement is maximum

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Crossing mean position

Answer

Half way between them

Question 29

29. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

Progressive waves

Answer

None of these

Answer

Periodic waves

Question 30

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

Question 31

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

Answer

Energy and mass

Answer

Energy, momentum and mass

Answer

Energy and linear momentum

Question 32

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

Answer

1/T seconds

Answer

1/f seconds

Question 33

33. The gases have a

Answer

None of these

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Question 34

34. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They are transverse waves

Answer

They require material medium for propagation

Answer

They are stationary waves

Question 35

35. 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 36

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

Answer

Maximum in the extreme position

Answer

None of these

Answer

Zero in the mean position

Question 37

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

Question 38

38. In simple harmonic motion,

Answer

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

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

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

Answer

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

Question 39

39. In stationary waves

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Energy is minimum at nodes and maximum at antinodes

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Energy is uniformly distributed

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Energy is minimum at nodes and maximum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 40

40. 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

Answer

Remain unaffected

Question 41

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

Answer

Twice that of the individual waves

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Half that of the individual waves

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Same as that of the individual waves

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√2 that of the individual waves

Question 42

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

Answer

Polarization

Answer

Interference

Answer

Reflection

Answer

Refraction

Question 43

43. 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 44

44. 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

There is a gain of energy

Answer

The energy is redistributed and the distribution remains constant with time

Question 45

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

Answer

4π second

Answer

2π second

Question 46

46. The Doppler effect is produced if

Answer

Both the above

Answer

None of these

Answer

The source is in motion

Answer

The detector is in motion

Question 47

47. 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 48

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

Question 49

49. A system under going force vibrations is known as

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Driven harmonic oscillator

Question 50

50. Fidelity refers to

Answer

Reproduction of original sound

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original image

Answer

Reproduction of music

Question 51

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

Answer

None of these

Answer

Oscillation

Question 52

52. 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 53

53. In stationary waves

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Energy is maximum at nodes and minimum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Question 54

54. The speed of sound in a medium depends on

Answer

The inertia property but not on the elastic property

Answer

The elastic property as well as the inertia property

Answer

The elastic property but not on the inertia property

Answer

Neither the elastic property nor the inertia property

Question 55

55. 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 56

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

Answer

Neither pressure nor density

Answer

Both pressure and density

Answer

Pressure only

Answer

Density only

Question 57

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

Answer

Supersonic speed

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Extra supersonic speed

Answer

None of these

Answer

Sonic speed

Question 58

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 59

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

Answer

Independent of x

Question 60

60. 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 61

61. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 62

62. 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 not change

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Time period will increase

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Time period will depend on the weight of the boy.

Question 63

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

Answer

Moisture contents in air

Answer

Temperature of air

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The atmospheric pressure

Answer

The composition of air

Question 64

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

Answer 171

100 Nm¯¹

Answer 172

700 Nm¯¹

Answer 173

300 Nm¯¹

Answer 174

143 Nm¯¹

Answer 175

Quality factor is small

Answer 176

Restoring force is small

Answer 177

Applied periodic force is small

Answer 178

Damping force is small

Answer 179

Progressive wave

Answer 180

Longitudinal waves

Answer 181

Transverse wave

Answer 182

None of these

Answer 183

Remains constant

Answer 184

Becomes Zero

Answer 185

A straight line

Answer 186

An ellipse

Answer 187

A hyperbola

Answer 188

Wave mechanics

Answer 189

Energy of radiation

Answer 190

Intensity of light

Answer 191

x-ray radiation capacity

Answer 192

Sound loudness

Answer 193

Diffraction

Answer 194

Reflection

Answer 195

Polarization

Answer 196

Refraction

Answer 197

None of these

Answer 198

3,000 to 6,000 Hz

Answer 199

5,000 to 11,000 Hz

Answer 200

2,000 to 4,000 Hz

Answer 201

4,000 to 8,000 Hz

Answer 202

Light waves

Answer 203

Sound waves

Answer 204

All of these

Answer 205

Water waves

Answer 206

Sound wave only

Answer 207

Neither sound nor light wave

Answer 208

Both sound and light waves

Answer 209

Light wave only

Answer 210

Become zero

Answer 211

Remains same

Answer 212

Increased rapidly

Answer 213

None of these

Answer 214

Longitudinal

Answer 215

Stationary

Answer 216

Transverse

Answer 217

Electromagnetic

Answer 218

Simple Harmonic Motion

Answer 219

Angular Motion

Answer 220

Rectilinear Motion

Answer 221

Circular Motion

Answer 222

Amplitude and frequency of sound

Answer 223

Wavelength of sound

Answer 224

Density and elasticity of gas

Answer 225

√k₂/k₁

Answer 226

√k₁/k₂

Answer 227

Doppler effect

Answer 228

Interference

Answer 229

Beat phenomenon

Answer 230

Diffraction of sound waves

Answer 231

Polarization

Answer 232

Destructive interference

Answer 233

Constrictive and destructive interference

Answer 234

Do not affect photographic plate

Answer 235

Cannot be polarized

Answer 236

Have a lower frequency

Answer 237

Cannot be diffracted

Answer 238

Angular Momentum

Answer 239

P.E. Energy

Answer 240

K.E. Energy

Answer 241

Total Energy

Answer 242

1483 ms¯¹

Answer 243

1214 ms¯¹

Answer 244

1343 ms¯¹

Answer 245

1567 ms¯¹

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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