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 number of harmonic

Answer

Frequency and velocity

Answer

Intensity and frequency

Question 2

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

Answer

When v is maximum, α is zero

Answer

When v is maximum, α is maximum

Answer

When v is zero, α is zero

Answer

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

Question 3

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

Answer

There is a loss of energy

Answer

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 gain of energy

Question 4

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

Answer

1343 ms¯¹

Answer

1214 ms¯¹

Answer

1567 ms¯¹

Answer

1483 ms¯¹

Question 5

5. Fidelity refers to

Answer

Reproduction of music

Answer

Reproduction of original sound

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original image

Question 6

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

Answer

Pressure only

Answer

Density only

Answer

Neither pressure nor density

Answer

Both pressure and density

Question 7

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

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Question 8

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

Answer

4π second

Answer

2π second

Question 9

9. 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 10

10. 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 11

11. For production of beats the two sources must have

Answer

Different frequencies

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies and same phase

Question 12

12. 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

√k₁/k₂

Answer

√k₂/k₁

Question 13

13. 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 14

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

Question 15

15. 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 16

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

Question 17

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

Question 18

18. The distance between node and antinode is

Question 19

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

Answer

Become zero

Answer

Remains same

Question 20

20. What sort of waves exhibit the Doppler effect?

Answer

Sound waves

Answer

Water waves

Answer

Light waves

Answer

All of these

Question 21

21. 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

700 Nm¯¹

Answer

300 Nm¯¹

Answer

100 Nm¯¹

Answer

143 Nm¯¹

Question 22

22. Energy is not carried by

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Answer

Stationary waves

Answer

Transverse progressive waves

Question 23

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

Answer

Half that of the individual waves

Answer

Twice that of the individual waves

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Same as that of the individual waves

Answer

√2 that of the individual waves

Question 24

24. 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 25

25. A system under going force vibrations is known as

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Driven harmonic oscillator

Question 26

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

Answer

Refraction

Answer

Interference

Answer

Reflection

Answer

Polarization

Question 27

27. 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 28

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

Answer

Hyperbolic

Answer

Exponential

Answer

Logarithmic

Question 29

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

Answer

None of these

Answer

Supersonic speed

Answer

Extra supersonic speed

Answer

Sonic speed

Question 30

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

Answer

Doppler effect

Answer

Beats phenomena

Answer

All of these

Answer

Interference of waves

Question 31

31. 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 32

32. 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 33

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

Answer

Amplitude of motion will be very large

Answer

Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be every small

Question 34

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

Answer

Mechanical waves

Answer

Matter waves

Answer

Carrier waves

Answer

Electromagnetic waves

Question 35

35. 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 36

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

Question 37

37. Velocity of sound in vacuum is

Question 38

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

Question 39

39. 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 40

40. Decibel is unit of

Answer

Energy of radiation

Answer

x-ray radiation capacity

Answer

Sound loudness

Answer

Intensity of light

Question 41

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

Answer

Wave mechanics

Question 42

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

Answer

1/T seconds

Answer

1/f seconds

Question 43

43. 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 44

44. In simple harmonic motion,

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

Answer

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

Answer

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

Question 45

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

Answer

A hyperbola

Answer

A straight line

Answer

An ellipse

Question 46

46. 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 47

47. In stationary waves

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Question 48

48. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 49

49. The Doppler effect is produced if

Answer

None of these

Answer

The source is in motion

Answer

Both the above

Answer

The detector is in motion

Question 50

50. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Mechanical waves

Answer

None of these

Answer

Periodic waves

Question 51

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

Answer

Transverse progressive

Answer

Longitudinal progressive

Answer

Transverse stationary

Answer

Longitudinal stationary

Question 52

52. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 53

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

Answer

Phase difference

Answer

Wave length

Question 54

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

Answer

Progressive wave

Answer

Transverse wave

Answer

None of these

Answer

Longitudinal waves

Question 55

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

Answer

None of these

Answer

Maximum in the extreme position

Answer

Zero in the mean position

Question 56

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

Answer

Oscillation

Answer

None of these

Question 57

57. Sound waves in air always

Answer

Electromagnetic

Answer

Longitudinal

Answer

Stationary

Answer

Transverse

Question 58

58. In vibratory motion which parameter remains constant?

Answer

Total Energy

Answer

P.E. Energy

Answer

K.E. Energy

Answer

Angular Momentum

Question 59

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

Answer

Displacement is maximum

Answer

Half way between them

Answer

Crossing mean position

Question 60

60. The velocity of sound is greatest in

Question 61

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

Answer

Increases or decreases depending on the material

Answer

Remains same

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 increase

Answer

Time period will decrease

Answer

Time period will depend on the weight of the boy.

Answer

Time period will not change

Question 63

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

Question 64

64. 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 pitch

Answer

Has a definite capacity

Answer

Has a definite quality

Answer

Can penetrate the wall

Answer 168

Destructive interference

Answer 169

Constrictive and destructive interference

Answer 170

Polarization

Answer 171

Diffraction of sound waves

Answer 172

None of these

Answer 173

Wavelength of sound

Answer 174

Amplitude and frequency of sound

Answer 175

Density and elasticity of gas

Answer 176

Half the mass

Answer 177

Reduce the mass to one fourth

Answer 178

Quadruple the mass

Answer 179

Double the mass

Answer 180

The atmospheric pressure

Answer 181

Moisture contents in air

Answer 182

Temperature of air

Answer 183

The composition of air

Answer 184

Independent of x

Answer 185

Wavelength

Answer 186

None of these

Answer 187

√6 times slower

Answer 188

6 times faster

Answer 189

At correct rate

Answer 190

√6 times faster

Answer 191

An apparent increase in frequency

Answer 192

An apparent decrease in wavelength

Answer 193

No apparent change in frequency

Answer 194

An apparent decrease in frequency

Answer 195

Quality factor is small

Answer 196

Applied periodic force is small

Answer 197

Restoring force is small

Answer 198

Damping force is small

Answer 199

Reflection

Answer 200

Polarization

Answer 201

Refraction

Answer 202

Diffraction

Answer 203

Remains constant

Answer 204

Becomes Zero

Answer 205

They are stationary waves

Answer 206

They do not have enough energy

Answer 207

They are transverse waves

Answer 208

They require material medium for propagation

Answer 209

Neither the elastic property nor the inertia property

Answer 210

The inertia property but not on the elastic property

Answer 211

The elastic property but not on the inertia property

Answer 212

The elastic property as well as the inertia property

Answer 213

Smaller elastic modules

Answer 214

Zero elastic modulus

Answer 215

Large elastic modulus

Answer 216

None of these

Answer 217

Interference

Answer 218

Beat phenomenon

Answer 219

Doppler effect

Answer 220

Simple Harmonic Motion

Answer 221

Angular Motion

Answer 222

Rectilinear Motion

Answer 223

Circular Motion

Answer 224

Oscillation Time

Answer 225

Reverberation

Answer 226

Time period

Answer 227

Diffraction

Answer 228

Refraction

Answer 229

Interference

Answer 230

Polarization

Answer 231

Increased rapidly

Answer 232

None of these

Answer 233

Becomes one half

Answer 234

Become one fourth

Answer 235

Becomes double

Answer 236

Remains same

Answer 237

Remains unchanged

Answer 238

Becomes zero

Answer 239

Neither sound nor light wave

Answer 240

Light wave only

Answer 241

Both sound and light waves

Answer 242

Sound wave only

Answer 243

k₁ k₂/( k₁+k₂)

Answer 244

√k₁k₂

Answer 245

(k₁+k₂)/2

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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