Physics Waves Online Mcqs Test

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Question 1

1. 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

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Becomes one half

Answer

Remains same

Question 2

2. For production of beats the two sources must have

Answer

Different frequencies and same phase

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Different frequencies, same amplitude and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies

Question 3

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

Answer

1/T seconds

Answer

1/f seconds

Question 4

4. 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

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√k₂/k₁

Question 5

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

Answer

Wave mechanics

Question 6

6. 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 7

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

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Mechanical waves

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Matter waves

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Electromagnetic waves

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Carrier waves

Question 8

8. What sort of waves exhibit the Doppler effect?

Answer

Water waves

Answer

All of these

Answer

Light waves

Answer

Sound waves

Question 9

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

Question 10

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

Question 11

11. The gases have a

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Large elastic modulus

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Zero elastic modulus

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Smaller elastic modules

Answer

None of these

Question 12

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

Question 13

13. 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)

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(k₁+k₂)/2

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√k₁k₂

Question 14

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

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Quality factor is small

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Restoring force is small

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Damping force is small

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Applied periodic force is small

Question 15

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

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

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Reproduction of music

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Reproduction of original image

Question 17

17. 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 pitch

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Can penetrate the wall

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Has a definite capacity

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Has a definite quality

Question 18

18. Sound waves do not travel in vacuum because

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They do not have enough energy

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They are transverse waves

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They are stationary waves

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They require material medium for propagation

Question 19

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

Answer

Interference

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Question 20

20. 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 21

21. 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 as well as 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

Question 22

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

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2π second

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4π second

Question 23

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

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Doppler effect

Answer

Beat phenomenon

Answer

Interference

Question 24

24. Energy is not carried by

Answer

Transverse progressive waves

Answer

Stationary waves

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Question 25

25. In stationary waves

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Energy is uniformly distributed

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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

Question 26

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

Answer

None of these

Answer

Wavelength

Question 27

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

Question 28

28. 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 29

29. 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

Answer

300 Nm¯¹

Answer

100 Nm¯¹

Answer

700 Nm¯¹

Question 30

30. The distance between node and anti-node is

Question 31

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

Answer

Cannot be polarized

Answer

Have a lower frequency

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Cannot be diffracted

Answer

Do not affect photographic plate

Question 32

32. Velocity of sound in vacuum is

Question 33

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

Answer

Independent of x

Question 34

34. 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 35

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

Answer

None of these

Answer

Increased rapidly

Question 36

36. The velocity of sound in air depends upon

Answer

Density and elasticity of gas

Answer

Wavelength of sound

Answer

Amplitude and frequency of sound

Question 37

37. The Doppler effect is produced if

Answer

The source is in motion

Answer

Both the above

Answer

None of these

Answer

The detector is in motion

Question 38

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

Answer

Refraction

Answer

Polarization

Answer

Reflection

Answer

Interference

Question 39

39. 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 increase

Answer

Time period will not change

Answer

Time period will decrease

Question 40

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

Question 41

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

Question 42

42. 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 43

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

Answer

Beats phenomena

Answer

Doppler effect

Answer

All of these

Answer

Interference of waves

Question 44

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

Answer

Half way between them

Answer

Displacement is maximum

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Crossing mean position

Question 45

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

Answer

Quadruple the mass

Answer

Half the mass

Answer

Double the mass

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Reduce the mass to one fourth

Question 46

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

Answer

6 times faster

Answer

√6 times slower

Answer

√6 times faster

Answer

At correct rate

Question 47

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

Answer

Phase difference

Answer

Wave length

Question 48

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

Answer

Out of phase

Answer

None of these

Answer

Sometimes in phase

Question 49

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

Answer

Sonic speed

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Supersonic speed

Answer

Extra supersonic speed

Answer

None of these

Question 50

50. 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 51

51. 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

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

Answer

When v is maximum, α is maximum

Answer

When v is maximum, α is zero

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. 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 54

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

Question 55

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

Answer

4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Answer

2,000 to 4,000 Hz

Question 56

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

Question 57

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

Answer

The atmospheric pressure

Answer

Temperature of air

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The composition of air

Answer

Moisture contents in air

Question 58

58. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

Total Energy

Answer

K.E. Energy

Answer

P.E. Energy

Question 59

59. Sound waves in air always

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Transverse

Answer

Electromagnetic

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Longitudinal

Answer

Stationary

Question 60

60. 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)

Answer

5 β – 4 α

Answer

5α – 4β

Question 61

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

Answer

Oscillation

Answer

None of these

Question 62

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

Answer

Refraction

Answer

Reflection

Answer

Polarization

Answer

Diffraction

Question 63

63. Waves transmit _________ from one place to another

Answer

None of these

Question 64

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

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Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and velocity

Answer

Frequency and number of harmonic

Answer 159

The energy is redistributed and the distribution changes with time

Answer 160

There is a loss of energy

Answer 161

The energy is redistributed and the distribution remains constant with time

Answer 162

There is a gain of energy

Answer 163

An apparent increase in frequency

Answer 164

An apparent decrease in frequency

Answer 165

No apparent change in frequency

Answer 166

An apparent decrease in wavelength

Answer 167

Periodic waves

Answer 168

None of these

Answer 169

Progressive waves

Answer 170

Mechanical waves

Answer 171

Transverse wave

Answer 172

Longitudinal waves

Answer 173

Progressive wave

Answer 174

None of these

Answer 175

Energy is uniformly distributed

Answer 176

Energy is minimum at nodes and maximum at antidotes

Answer 177

Energy is minimum at nodes and maximum at antinodes

Answer 178

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 179

An ellipse

Answer 180

A hyperbola

Answer 181

A straight line

Answer 182

Becomes Zero

Answer 183

Remains constant

Answer 184

Remains same

Answer 185

Increases or decreases depending on the material

Answer 186

Density only

Answer 187

Both pressure and density

Answer 188

Pressure only

Answer 189

Neither pressure nor density

Answer 190

Neither sound nor light wave

Answer 191

Light wave only

Answer 192

Sound wave only

Answer 193

Both sound and light waves

Answer 194

Maximum in the extreme position

Answer 195

Zero in the mean position

Answer 196

None of these

Answer 197

Energy of radiation

Answer 198

x-ray radiation capacity

Answer 199

Sound loudness

Answer 200

Intensity of light

Answer 201

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

Answer 202

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

Answer 203

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

Answer 204

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

Answer 205

Half that of the individual waves

Answer 206

Twice that of the individual waves

Answer 207

√2 that of the individual waves

Answer 208

Same as that of the individual waves

Answer 209

Amplitude of motion will be very large

Answer 210

Independent of amplitude of motion

Answer 211

None of these

Answer 212

Amplitude of motion will be every small

Answer 213

Logarithmic

Answer 214

Exponential

Answer 215

Hyperbolic

Answer 216

Remains unchanged

Answer 217

Becomes zero

Answer 218

Circular Motion

Answer 219

Simple Harmonic Motion

Answer 220

Rectilinear Motion

Answer 221

Angular Motion

Answer 222

Oscillation Time

Answer 223

Reverberation

Answer 224

Time period

Answer 225

Driven harmonic oscillator

Answer 226

Vibration harmonic oscillator

Answer 227

Frequency harmonic oscillator

Answer 228

Become zero

Answer 229

Remains same

Answer 230

1343 ms¯¹

Answer 231

1567 ms¯¹

Answer 232

1483 ms¯¹

Answer 233

1214 ms¯¹

Answer 234

Become infinite

Answer 235

Remain unaffected

Answer 236

Destructive interference

Answer 237

Constructive interference

Answer 238

Longitudinal progressive

Answer 239

Transverse progressive

Answer 240

Transverse stationary

Answer 241

Longitudinal stationary

Answer 242

Constrictive and destructive interference

Answer 243

Diffraction of sound waves

Answer 244

Polarization

Answer 245

Destructive 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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