Physics Waves Online Mcqs Test

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Question 1

1. Beats are the results of

Answer

Destructive interference

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Answer

Polarization

Question 2

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

Answer

Same as that of the individual waves

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√2 that of the individual waves

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Twice that of the individual waves

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Half that of the individual waves

Question 3

3. In stationary waves

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Alternating maximum and minimum energy producing at nodes and antinodes

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Energy is minimum at nodes and maximum at antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is uniformly distributed

Question 4

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

Question 5

5. 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 6

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

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Transverse stationary

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Longitudinal stationary

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Longitudinal progressive

Answer

Transverse progressive

Question 7

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

Answer

Mechanical waves

Answer

Electromagnetic waves

Answer

Carrier waves

Answer

Matter waves

Question 8

8. Sound waves do not travel in vacuum because

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They are transverse waves

Answer

They require material medium for propagation

Answer

They are stationary waves

Answer

They do not have enough energy

Question 9

9. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

Total Energy

Answer

P.E. Energy

Answer

Angular Momentum

Question 10

10. 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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Can penetrate the wall

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Has a definite quality

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Has a definite pitch

Question 11

11. 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

5α – 4β

Answer

9 (β – α)

Answer

5 β – 4 α

Question 12

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

Answer

Doppler effect

Answer

All of these

Answer

Interference of waves

Answer

Beats phenomena

Question 13

13. The velocity of sound is greatest in

Question 14

14. The gases have a

Answer

None of these

Answer

Smaller elastic modules

Answer

Zero elastic modulus

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Large elastic modulus

Question 15

15. The Doppler effect is produced if

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Both the above

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The source is in motion

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None of these

Answer

The detector is in motion

Question 16

16. Fidelity refers to

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Reproduction of a CD from original copy

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Reproduction of original sound

Answer

Reproduction of original image

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Reproduction of music

Question 17

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

Answer

Circular Motion

Answer

Rectilinear Motion

Answer

Angular Motion

Answer

Simple Harmonic Motion

Question 18

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

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Sonic speed

Answer

None of these

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Extra supersonic speed

Answer

Supersonic speed

Question 19

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

Answer

Moisture contents in air

Answer

The atmospheric pressure

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The composition of air

Answer

Temperature of air

Question 20

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

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Becomes zero

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Remains unchanged

Question 21

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

Question 22

22. 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 mass

Answer

Energy and linear momentum

Question 23

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

Answer

Wave mechanics

Question 24

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

Answer

Visible light

Answer

Infra-red radiation

Answer

Ultra-violet rays

Answer

Gamma rays

Question 25

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

Answer

Quadruple the mass

Answer

Double the mass

Answer

Half the mass

Answer

Reduce the mass to one fourth

Question 26

26. For production of beats the two sources must have

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies

Answer

Different frequencies and same phase

Question 27

27. 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 28

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

Question 29

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

Answer

Restoring force is small

Answer

Quality factor is small

Answer

Applied periodic force is small

Answer

Damping force is small

Question 30

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

Answer

4π second

Answer

2π second

Question 31

31. The distance between node and anti-node is

Question 32

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

Question 33

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

Answer

1/f seconds

Answer

1/T seconds

Question 34

34. Energy is not carried by

Answer

Stationary waves

Answer

Longitudinal vibration

Answer

Transverse progressive waves

Answer

Electromagnetic waves

Question 35

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

Question 36

36. 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

Remains same

Answer

Becomes one half

Question 37

37. 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 38

38. 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 39

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

Question 40

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

Answer

None of these

Answer

Oscillation

Question 41

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

Answer

Interference

Answer

Beat phenomenon

Answer

Doppler effect

Question 42

42. 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 43

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

Answer

Independent of x

Question 44

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

Answer

Hyperbolic

Answer

Exponential

Answer

Logarithmic

Question 45

45. The distance between node and antinode is

Question 46

46. 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 zero, α is zero

Answer

When v is maximum, α is maximum

Answer

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

Answer

When v is maximum, α is zero

Question 47

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

Question 48

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

Answer

Both pressure and density

Answer

Pressure only

Answer

Neither pressure nor density

Answer

Density only

Question 49

49. 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 50

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

Question 51

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

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Do not affect photographic plate

Answer

Cannot be diffracted

Question 52

52. In stationary waves

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Question 53

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

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be very large

Answer

None of these

Answer

Amplitude of motion will be every small

Question 54

54. 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 55

55. Waves transmit _________ from one place to another

Answer

None of these

Question 56

56. 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 faster

Answer

√6 times slower

Question 57

57. 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 58

58. In simple harmonic motion,

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

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

Question 59

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

Answer

Intensity and frequency

Answer

Intensity and velocity

Answer

Frequency and number of harmonic

Answer

Frequency and velocity

Question 60

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

Answer

None of these

Answer

Wavelength

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. 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

100 Nm¯¹

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Answer

300 Nm¯¹

Question 63

63. Doppler-effect applies to

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Sound wave only

Answer

Both sound and light waves

Question 64

64. Velocity of sound in vacuum is

Answer 166

Density and elasticity of gas

Answer 167

Amplitude and frequency of sound

Answer 168

Wavelength of sound

Answer 169

Oscillation Time

Answer 170

Reverberation

Answer 171

Time period

Answer 172

Wave length

Answer 173

Phase difference

Answer 174

5,000 to 11,000 Hz

Answer 175

4,000 to 8,000 Hz

Answer 176

3,000 to 6,000 Hz

Answer 177

2,000 to 4,000 Hz

Answer 178

Become zero

Answer 179

Remains same

Answer 180

Time period will depend on the weight of the boy.

Answer 181

Time period will not change

Answer 182

Time period will decrease

Answer 183

Time period will increase

Answer 184

There is a loss of energy

Answer 185

There is a gain of energy

Answer 186

The energy is redistributed and the distribution changes with time

Answer 187

The energy is redistributed and the distribution remains constant with time

Answer 188

An apparent decrease in wavelength

Answer 189

An apparent increase in frequency

Answer 190

No apparent change in frequency

Answer 191

An apparent decrease in frequency

Answer 192

Becomes Zero

Answer 193

Remains constant

Answer 194

1567 ms¯¹

Answer 195

1214 ms¯¹

Answer 196

1483 ms¯¹

Answer 197

1343 ms¯¹

Answer 198

The elastic property but not on the inertia property

Answer 199

The elastic property as well as the inertia property

Answer 200

Neither the elastic property nor the inertia property

Answer 201

The inertia property but not on the elastic property

Answer 202

Longitudinal

Answer 203

Stationary

Answer 204

Electromagnetic

Answer 205

Transverse

Answer 206

Crossing mean position

Answer 207

Half way between them

Answer 208

Displacement is maximum

Answer 209

Reflection

Answer 210

Refraction

Answer 211

Polarization

Answer 212

Diffraction

Answer 213

Energy of radiation

Answer 214

x-ray radiation capacity

Answer 215

Sound loudness

Answer 216

Intensity of light

Answer 217

√k₁k₂

Answer 218

(k₁+k₂)/2

Answer 219

k₁ k₂/( k₁+k₂)

Answer 220

Mechanical waves

Answer 221

Progressive waves

Answer 222

None of these

Answer 223

Periodic waves

Answer 224

Reflection

Answer 225

Polarization

Answer 226

Refraction

Answer 227

Interference

Answer 228

All of these

Answer 229

Sound waves

Answer 230

Light waves

Answer 231

Water waves

Answer 232

None of these

Answer 233

Zero in the mean position

Answer 234

Maximum in the extreme position

Answer 235

Vibration harmonic oscillator

Answer 236

Frequency harmonic oscillator

Answer 237

Driven harmonic oscillator

Answer 238

None of these

Answer 239

Increased rapidly

Answer 240

Interference

Answer 241

Polarization

Answer 242

Refraction

Answer 243

Diffraction

Answer 244

Destructive interference

Answer 245

Constructive interference

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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