Physics Waves Online Mcqs Test

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Question 1

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

Question 2

2. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Question 3

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

Answer

Becomes one half

Answer

Remains same

Answer

Become one fourth

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Becomes double

Question 4

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 5

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

Answer

1/T seconds

Answer

1/f seconds

Question 6

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

Answer

Oscillation

Answer

None of these

Question 7

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

Question 8

8. 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 9

9. 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 10

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

Answer

Independent of x

Question 11

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

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Doppler effect

Answer

Interference

Answer

Beat phenomenon

Question 12

12. 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 13

13. An oscillating mass-spring system generates

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Mechanical waves

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None of these

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Periodic waves

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Progressive waves

Question 14

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

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Longitudinal progressive

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Longitudinal stationary

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Transverse stationary

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Transverse progressive

Question 15

15. Energy is not carried by

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Electromagnetic waves

Answer

Stationary waves

Answer

Longitudinal vibration

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Transverse progressive waves

Question 16

16. 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 maximum at nodes and minimum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 17

17. The speed of sound in a medium depends on

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Neither the elastic property nor the inertia property

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The elastic property but not on the inertia property

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The inertia property but not on the elastic property

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The elastic property as well as the inertia property

Question 18

18. 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 19

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

Answer

Wave mechanics

Question 20

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

Answer

Refraction

Answer

Reflection

Answer

Diffraction

Answer

Polarization

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

100 Nm¯¹

Answer

300 Nm¯¹

Answer

143 Nm¯¹

Question 22

22. In simple harmonic motion,

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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

Answer

The velocity and acceleration 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

Question 23

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

Question 24

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

Answer

Applied periodic force is small

Answer

Restoring force is small

Answer

Damping force is small

Answer

Quality factor is small

Question 25

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

Answer

None of these

Answer

Sometimes in phase

Answer

Out of phase

Question 26

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

Answer

Mechanical waves

Answer

Carrier waves

Answer

Matter waves

Answer

Electromagnetic waves

Question 27

27. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Water waves

Answer

Light waves

Answer

Sound waves

Question 28

28. 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 29

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

Answer

Interference of waves

Answer

Doppler effect

Answer

Beats phenomena

Answer

All of these

Question 30

30. Fidelity refers to

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Reproduction of a CD from original copy

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Reproduction of original image

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Reproduction of original sound

Answer

Reproduction of music

Question 31

31. 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

Answer

Has a definite quality

Question 32

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

Answer

Simple Harmonic Motion

Answer

Circular Motion

Answer

Rectilinear Motion

Answer

Angular Motion

Question 33

33. 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 34

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

Answer

2π second

Answer

4π second

Question 35

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

Question 36

36. The gases have a

Answer

None of these

Answer

Zero elastic modulus

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Large elastic modulus

Answer

Smaller elastic modules

Question 37

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

Answer

An ellipse

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A straight line

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A hyperbola

Question 38

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

Answer

Phase difference

Answer

Wave length

Question 39

39. Decibel is unit of

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Energy of radiation

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x-ray radiation capacity

Answer

Intensity of light

Answer

Sound loudness

Question 40

40. For production of beats the two sources must have

Answer

Different frequencies and same amplitude

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same phase

Answer

Different frequencies

Question 41

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

Answer

Polarization

Answer

Reflection

Answer

Refraction

Answer

Interference

Question 42

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

Answer

None of these

Answer

Zero in the mean position

Answer

Maximum in the extreme position

Question 43

43. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

K.E. Energy

Answer

Total Energy

Answer

P.E. Energy

Question 44

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

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Answer

1483 ms¯¹

Answer

1214 ms¯¹

Question 45

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

Answer

3,000 to 6,000 Hz

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Question 46

46. The distance between node and antinode is

Question 47

47. 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 not change

Answer

Time period will decrease

Answer

Time period will increase

Answer

Time period will depend on the weight of the boy.

Question 48

48. 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 49

49. The velocity of sound is greatest in

Question 50

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

Answer

The composition of air

Answer

Temperature of air

Answer

The atmospheric pressure

Answer

Moisture contents in air

Question 51

51. The Doppler effect is produced if

Answer

The detector is in motion

Answer

None of these

Answer

The source is in motion

Answer

Both the above

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

Question 54

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

Answer

An apparent increase in frequency

Answer

An apparent decrease in wavelength

Answer

No apparent change in frequency

Answer

An apparent decrease in frequency

Question 55

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

Answer

Transverse wave

Answer

None of these

Answer

Progressive wave

Answer

Longitudinal waves

Question 56

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

Answer

Remains unchanged

Answer

Becomes zero

Question 57

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

Answer

Visible light

Answer

Gamma rays

Answer

Ultra-violet rays

Answer

Infra-red radiation

Question 58

58. 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 59

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

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Amplitude of motion will be every small

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Amplitude of motion will be very large

Answer

None of these

Answer

Independent of amplitude of motion

Question 60

60. Beats are the results of

Answer

Destructive interference

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Diffraction of sound waves

Answer

Polarization

Answer

Constrictive and destructive interference

Question 61

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

Answer

Cannot be polarized

Answer

Do not affect photographic plate

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Have a lower frequency

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Cannot be diffracted

Question 62

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

Answer

Remains constant

Answer

Becomes Zero

Question 63

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

Answer

Twice that of the individual waves

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√2 that of the individual waves

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Half that of the individual waves

Answer

Same as that of the individual waves

Question 64

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

Answer 175

Density only

Answer 176

Both pressure and density

Answer 177

Pressure only

Answer 178

Neither pressure nor density

Answer 179

Diffraction

Answer 180

Interference

Answer 181

Polarization

Answer 182

Refraction

Answer 183

Reverberation

Answer 184

Time period

Answer 185

Oscillation Time

Answer 186

Logarithmic

Answer 187

Hyperbolic

Answer 188

Exponential

Answer 189

The energy is redistributed and the distribution remains constant with time

Answer 190

The energy is redistributed and the distribution changes with time

Answer 191

There is a loss of energy

Answer 192

There is a gain of energy

Answer 193

They require material medium for propagation

Answer 194

They do not have enough energy

Answer 195

They are stationary waves

Answer 196

They are transverse waves

Answer 197

Increased rapidly

Answer 198

None of these

Answer 199

When v is maximum, α is maximum

Answer 200

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

Answer 201

When v is zero, α is zero

Answer 202

When v is maximum, α is zero

Answer 203

Constructive interference

Answer 204

Destructive interference

Answer 205

Remains same

Answer 206

Become zero

Answer 207

5α – 4β

Answer 208

5 β – 4 α

Answer 209

9 (β – α)

Answer 210

Amplitude and frequency of sound

Answer 211

Density and elasticity of gas

Answer 212

Wavelength of sound

Answer 213

Energy and linear momentum

Answer 214

Energy, momentum and mass

Answer 215

Energy and mass

Answer 216

Intensity and velocity

Answer 217

Frequency and number of harmonic

Answer 218

Intensity and frequency

Answer 219

Frequency and velocity

Answer 220

Both sound and light waves

Answer 221

Light wave only

Answer 222

Neither sound nor light wave

Answer 223

Sound wave only

Answer 224

(k₁+k₂)/2

Answer 225

√k₁k₂

Answer 226

k₁ k₂/( k₁+k₂)

Answer 227

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 228

Energy is uniformly distributed

Answer 229

Energy is minimum at nodes and maximum at antinodes

Answer 230

Energy is minimum at nodes and maximum at antidotes

Answer 231

None of these

Answer 232

6 times faster

Answer 233

At correct rate

Answer 234

√6 times slower

Answer 235

√6 times faster

Answer 236

None of these

Answer 237

Extra supersonic speed

Answer 238

Supersonic speed

Answer 239

Sonic speed

Answer 240

Wavelength

Answer 241

None of these

Answer 242

Stationary

Answer 243

Electromagnetic

Answer 244

Longitudinal

Answer 245

Transverse

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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