Physics Waves Online Mcqs Test

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Question 1

1. Fidelity refers to

Answer

Reproduction of music

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Reproduction of original image

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Reproduction of a CD from original copy

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Reproduction of original sound

Question 2

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

Question 3

3. The Doppler effect is produced if

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The source is in motion

Answer

Both the above

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The detector is in motion

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None of these

Question 4

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

Question 5

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

Question 6

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

Answer

Exponential

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Hyperbolic

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Logarithmic

Question 7

7. 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 8

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

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Independent of amplitude of motion

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Amplitude of motion will be very large

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Amplitude of motion will be every small

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None of these

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

Answer

Reflection

Answer

Interference

Answer

Polarization

Answer

Refraction

Question 11

11. The distance between node and antinode is

Question 12

12. Beats are the results of

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Polarization

Answer

Constrictive and destructive interference

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Diffraction of sound waves

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Destructive interference

Question 13

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

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4π second

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2π second

Question 14

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

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None of these

Answer

Increased rapidly

Question 15

15. 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 16

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

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Remains same

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Increases or decreases depending on the material

Question 17

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

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Oscillation Time

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Time period

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Reverberation

Question 18

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

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Oscillation

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None of these

Question 19

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

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Sometimes in phase

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Out of phase

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None of these

Question 20

20. 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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None of these

Answer

Longitudinal waves

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Transverse wave

Question 21

21. 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 22

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

Question 23

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

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Cannot be polarized

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Cannot be diffracted

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Have a lower frequency

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Do not affect photographic plate

Question 24

24. 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

100 Nm¯¹

Answer

700 Nm¯¹

Question 25

25. 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

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

Answer

When v is maximum, α is maximum

Answer

When v is zero, α is zero

Question 26

26. 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 depend on the weight of the boy.

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Time period will decrease

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Time period will not change

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Time period will increase

Question 27

27. An oscillating mass-spring system generates

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Mechanical waves

Answer

None of these

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Progressive waves

Answer

Periodic waves

Question 28

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

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Displacement is maximum

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Half way between them

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Crossing mean position

Question 29

29. Velocity of sound in vacuum is

Question 30

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

Question 31

31. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

P.E. Energy

Answer

Angular Momentum

Answer

Total Energy

Question 32

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

Answer

The atmospheric pressure

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Temperature of air

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Moisture contents in air

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The composition of air

Question 33

33. In stationary waves

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Energy is minimum at nodes and maximum at antinodes

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Energy is maximum at nodes and minimum at antidotes

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Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Question 34

34. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 35

35. 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 36

36. 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

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Sonic speed

Question 37

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

Answer

Both pressure and density

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Density only

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Pressure only

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Neither pressure nor density

Question 38

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

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Remains constant

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Becomes Zero

Question 39

39. The beats frequency (sensible) for a human car is

Question 40

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

Answer

Simple Harmonic Motion

Answer

Angular Motion

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Rectilinear Motion

Answer

Circular Motion

Question 41

41. A system under going force vibrations is known as

Answer

Frequency harmonic oscillator

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Driven harmonic oscillator

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Vibration harmonic oscillator

Question 42

42. Doppler-effect applies to

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Sound wave only

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Neither sound nor light wave

Answer

Light wave only

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Both sound and light waves

Question 43

43. 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

(k₁+k₂)/2

Answer

√k₁k₂

Question 44

44. 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 45

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

Question 46

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

Question 47

47. 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 48

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

Answer

Becomes zero

Answer

Remains unchanged

Question 49

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

Question 50

50. What sort of waves exhibit the Doppler effect?

Answer

Sound waves

Answer

Water waves

Answer

Light waves

Answer

All of these

Question 51

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

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Answer

4,000 to 8,000 Hz

Answer

2,000 to 4,000 Hz

Question 52

52. The distance between node and anti-node is

Question 53

53. Sound waves do not travel in vacuum because

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They are transverse waves

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They do not have enough energy

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They are stationary waves

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They require material medium for propagation

Question 54

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

Answer

Quality factor is small

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Restoring force is small

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Damping force is small

Answer

Applied periodic force is small

Question 55

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

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Answer

Interference

Question 56

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

Answer

Wave length

Answer

Phase difference

Question 57

57. 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

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An ellipse

Question 58

58. The speed of sound in a medium depends on

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Neither the elastic property nor the inertia property

Answer

The elastic property but not on the inertia property

Answer

The inertia property but not on the elastic property

Answer

The elastic property as well as the inertia property

Question 59

59. Decibel is unit of

Answer

Energy of radiation

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x-ray radiation capacity

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Sound loudness

Answer

Intensity of light

Question 60

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

Question 61

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

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

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Double the mass

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Half the mass

Question 62

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

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Becomes one half

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Becomes double

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Remains same

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Become one fourth

Question 63

63. 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

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Become zero

Question 64

64. 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

Answer 159

Stationary

Answer 160

Electromagnetic

Answer 161

Longitudinal

Answer 162

Transverse

Answer 163

Reflection

Answer 164

Polarization

Answer 165

Refraction

Answer 166

Diffraction

Answer 167

1567 ms¯¹

Answer 168

1214 ms¯¹

Answer 169

1343 ms¯¹

Answer 170

1483 ms¯¹

Answer 171

Gamma rays

Answer 172

Infra-red radiation

Answer 173

Visible light

Answer 174

Ultra-violet rays

Answer 175

Zero elastic modulus

Answer 176

Smaller elastic modules

Answer 177

Large elastic modulus

Answer 178

None of these

Answer 179

The energy is redistributed and the distribution changes with time

Answer 180

The energy is redistributed and the distribution remains constant with time

Answer 181

There is a gain of energy

Answer 182

There is a loss of energy

Answer 183

Beats phenomena

Answer 184

Interference of waves

Answer 185

Doppler effect

Answer 186

All of these

Answer 187

Independent of x

Answer 188

Different frequencies

Answer 189

Different frequencies and same amplitude

Answer 190

Different frequencies, same amplitude and same phase

Answer 191

Different frequencies and same phase

Answer 192

Stationary waves

Answer 193

Transverse progressive waves

Answer 194

Electromagnetic waves

Answer 195

Longitudinal vibration

Answer 196

Energy and mass

Answer 197

Energy and linear momentum

Answer 198

Energy, momentum and mass

Answer 199

Intensity and frequency

Answer 200

Frequency and number of harmonic

Answer 201

Intensity and velocity

Answer 202

Frequency and velocity

Answer 203

Wave mechanics

Answer 204

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

Answer 205

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

Answer 206

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

Answer 207

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

Answer 208

Zero in the mean position

Answer 209

None of these

Answer 210

Maximum in the extreme position

Answer 211

Doppler effect

Answer 212

Interference

Answer 213

Beat phenomenon

Answer 214

Twice that of the individual waves

Answer 215

Half that of the individual waves

Answer 216

Same as that of the individual waves

Answer 217

√2 that of the individual waves

Answer 218

Matter waves

Answer 219

Mechanical waves

Answer 220

Electromagnetic waves

Answer 221

Carrier waves

Answer 222

None of these

Answer 223

Wavelength of sound

Answer 224

Density and elasticity of gas

Answer 225

Amplitude and frequency of sound

Answer 226

At correct rate

Answer 227

6 times faster

Answer 228

√6 times faster

Answer 229

√6 times slower

Answer 230

None of these

Answer 231

Wavelength

Answer 232

Energy is minimum at nodes and maximum at antinodes

Answer 233

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 234

Energy is minimum at nodes and maximum at antidotes

Answer 235

Energy is uniformly distributed

Answer 236

No apparent change in frequency

Answer 237

An apparent increase in frequency

Answer 238

An apparent decrease in wavelength

Answer 239

An apparent decrease in frequency

Answer 240

1/T seconds

Answer 241

1/f seconds

Answer 242

Transverse progressive

Answer 243

Longitudinal stationary

Answer 244

Longitudinal progressive

Answer 245

Transverse stationary

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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