Physics Waves Online Mcqs Test

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Question 1

1. 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 2

2. Silence zone takes place due to

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Constructive interference

Answer

Destructive interference

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

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Crossing mean position

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Displacement is maximum

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Half way between them

Question 5

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

Answer

None of these

Answer

Oscillation

Question 6

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

Question 7

7. 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 8

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

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Half the mass

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Quadruple the mass

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Reduce the mass to one fourth

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Double the mass

Question 9

9. A pendulum clock that keeps correct time on the Earth is taken to the Moon. It will run

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At correct rate

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6 times faster

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√6 times faster

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√6 times slower

Question 10

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

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Frequency and number of harmonic

Answer

Intensity and velocity

Answer

Frequency and velocity

Answer

Intensity and frequency

Question 11

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

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Reverberation

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Time period

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Oscillation Time

Question 12

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

Answer

Infra-red radiation

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Visible light

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Ultra-violet rays

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Gamma rays

Question 13

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

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None of these

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Zero in the mean position

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Maximum in the extreme position

Question 14

14. 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 15

15. The gases have a

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None of these

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Zero elastic modulus

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Smaller elastic modules

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Large elastic modulus

Question 16

16. 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.

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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 17

17. In simple harmonic motion,

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

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

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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

Question 18

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

Answer

Become one fourth

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Becomes double

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Becomes one half

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Remains same

Question 19

19. In stationary waves

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Energy is maximum at nodes and minimum at antidotes

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Energy is uniformly distributed

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Energy is minimum at nodes and maximum at antinodes

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Alternating maximum and minimum energy producing at nodes and antinodes

Question 20

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

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There is a loss of energy

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The energy is redistributed and the distribution changes with time

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The energy is redistributed and the distribution remains constant with time

Answer

There is a gain of energy

Question 21

21. Decibel is unit of

Answer

Energy of radiation

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x-ray radiation capacity

Answer

Intensity of light

Answer

Sound loudness

Question 22

22. 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

143 Nm¯¹

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100 Nm¯¹

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300 Nm¯¹

Answer

700 Nm¯¹

Question 23

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

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Longitudinal progressive

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Transverse progressive

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Transverse stationary

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Longitudinal stationary

Question 24

24. 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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k₁ k₂/( k₁+k₂)

Answer

√k₁k₂

Question 25

25. The speed of sound in a medium depends on

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The elastic property as well as the inertia property

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The inertia property but not on the elastic property

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The elastic property but not on the inertia property

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Neither the elastic property nor the inertia property

Question 26

26. 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 zero, α is zero

Answer

When v is maximum, α is zero

Answer

When v is maximum, α is maximum

Question 27

27. 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 28

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

Answer

Refraction

Answer

Polarization

Answer

Reflection

Answer

Interference

Question 29

29. Fidelity refers to

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Reproduction of music

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Reproduction of original image

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Reproduction of a CD from original copy

Answer

Reproduction of original sound

Question 30

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

Answer

Wave mechanics

Question 31

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

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1483 ms¯¹

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1567 ms¯¹

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1343 ms¯¹

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1214 ms¯¹

Question 32

32. In stationary waves

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Energy is uniformly distributed

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Energy is minimum at nodes and maximum at antinodes

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Energy is minimum at nodes and maximum at antidotes

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Alternating maximum and minimum energy producing at nodes and antinodes

Question 33

33. The distance between node and antinode is

Question 34

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

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The composition of air

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Moisture contents in air

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Temperature of air

Answer

The atmospheric pressure

Question 35

35. 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

√k₂/k₁

Answer

√k₁/k₂

Question 36

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

Answer

Exponential

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Logarithmic

Answer

Hyperbolic

Question 37

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

Answer

Longitudinal waves

Answer

Transverse wave

Answer

None of these

Answer

Progressive wave

Question 38

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

Answer

Becomes zero

Answer

Remains unchanged

Question 39

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

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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

Answer

Independent of amplitude of motion

Question 40

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

Question 41

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

Question 42

42. 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 43

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

Answer

Diffraction

Answer

Refraction

Answer

Interference

Answer

Polarization

Question 44

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

Answer

1/T seconds

Answer

1/f seconds

Question 45

45. For production of beats the two sources must have

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Different frequencies and same amplitude

Answer

Different frequencies

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Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Question 46

46. 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 47

47. The velocity of sound is greatest in

Question 48

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

Answer

Phase difference

Answer

Wave length

Question 49

49. Beats are the results of

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Destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Answer

Constrictive and destructive interference

Question 50

50. 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

Answer

Same as that of the individual waves

Answer

√2 that of the individual waves

Question 51

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

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. 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

9 (β – α)

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5α – 4β

Answer

5 β – 4 α

Question 54

54. The distance between node and anti-node is

Question 55

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

Answer

Supersonic speed

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None of these

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Sonic speed

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Extra supersonic speed

Question 56

56. Sound waves in air always

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Electromagnetic

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Longitudinal

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Transverse

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Stationary

Question 57

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

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Becomes Zero

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Remains constant

Question 58

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

Answer

Energy, momentum and mass

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Energy and mass

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Energy and linear momentum

Question 59

59. What sort of waves exhibit the Doppler effect?

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Light waves

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All of these

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Sound waves

Answer

Water waves

Question 60

60. 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

Answer

Out of phase

Question 61

61. Velocity of sound in vacuum (in m/s) is

Question 62

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

Answer

Quality factor is small

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Damping force is small

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Restoring force is small

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Applied periodic force is small

Question 63

63. An oscillating mass-spring system generates

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Mechanical waves

Answer

None of these

Answer

Progressive waves

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Periodic waves

Question 64

64. Waves transmit _________ from one place to another

Answer

None of these

Answer 179

P.E. Energy

Answer 180

K.E. Energy

Answer 181

Angular Momentum

Answer 182

Total Energy

Answer 183

Time period will increase

Answer 184

Time period will depend on the weight of the boy.

Answer 185

Time period will not change

Answer 186

Time period will decrease

Answer 187

An ellipse

Answer 188

A straight line

Answer 189

A hyperbola

Answer 190

The detector is in motion

Answer 191

None of these

Answer 192

The source is in motion

Answer 193

Both the above

Answer 194

Matter waves

Answer 195

Carrier waves

Answer 196

Mechanical waves

Answer 197

Electromagnetic waves

Answer 198

Density only

Answer 199

Pressure only

Answer 200

Both pressure and density

Answer 201

Neither pressure nor density

Answer 202

Wavelength

Answer 203

None of these

Answer 204

Vibration harmonic oscillator

Answer 205

Driven harmonic oscillator

Answer 206

Frequency harmonic oscillator

Answer 207

Cannot be diffracted

Answer 208

Cannot be polarized

Answer 209

Do not affect photographic plate

Answer 210

Have a lower frequency

Answer 211

Light wave only

Answer 212

Sound wave only

Answer 213

Neither sound nor light wave

Answer 214

Both sound and light waves

Answer 215

An apparent decrease in frequency

Answer 216

No apparent change in frequency

Answer 217

An apparent decrease in wavelength

Answer 218

An apparent increase in frequency

Answer 219

They require material medium for propagation

Answer 220

They are stationary waves

Answer 221

They are transverse waves

Answer 222

They do not have enough energy

Answer 223

Interference

Answer 224

Beat phenomenon

Answer 225

Doppler effect

Answer 226

Circular Motion

Answer 227

Angular Motion

Answer 228

Rectilinear Motion

Answer 229

Simple Harmonic Motion

Answer 230

Independent of x

Answer 231

None of these

Answer 232

Increased rapidly

Answer 233

Amplitude and frequency of sound

Answer 234

Wavelength of sound

Answer 235

Density and elasticity of gas

Answer 236

Diffraction

Answer 237

Reflection

Answer 238

Polarization

Answer 239

Refraction

Answer 240

Transverse progressive waves

Answer 241

Stationary waves

Answer 242

Longitudinal vibration

Answer 243

Electromagnetic waves

Answer 244

2π second

Answer 245

4π second

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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