Physics Waves Online Mcqs Test

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Question 1

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

Answer

Zero in the mean position

Answer

None of these

Answer

Maximum in the extreme position

Question 2

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

Question 3

3. An oscillating mass-spring system generates

Answer

None of these

Answer

Mechanical waves

Answer

Periodic waves

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Progressive waves

Question 4

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

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Interference

Answer

Beat phenomenon

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Doppler effect

Question 5

5. Doppler-effect applies to

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Light wave only

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Sound wave only

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Neither sound nor light wave

Answer

Both sound and light waves

Question 6

6. 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 7

7. The Doppler effect is produced if

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Both the above

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The detector is in motion

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None of these

Answer

The source is in motion

Question 8

8. 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

700 Nm¯¹

Answer

100 Nm¯¹

Question 9

9. In stationary waves

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Alternating maximum and minimum energy producing at nodes and antinodes

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Energy is maximum at nodes and minimum at antidotes

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Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Question 10

10. A system under going force vibrations is known as

Answer

Vibration harmonic oscillator

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Frequency harmonic oscillator

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Driven harmonic oscillator

Question 11

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

Question 12

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

Question 13

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

Question 14

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

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The energy is redistributed and the distribution changes with time

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There is a gain of energy

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The energy is redistributed and the distribution remains constant with time

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There is a loss of energy

Question 15

15. The distance between node and antinode is

Question 16

16. The distance between node and anti-node is

Question 17

17. The gases have a

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Smaller elastic modules

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None of these

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Large elastic modulus

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Zero elastic modulus

Question 18

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 19

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

Question 20

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

Question 21

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

Answer

Amplitude of motion will be every small

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Independent of amplitude of motion

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Amplitude of motion will be very large

Answer

None of these

Question 22

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

Question 23

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

Answer

An apparent decrease in wavelength

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An apparent increase in frequency

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An apparent decrease in frequency

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No apparent change in frequency

Question 24

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

Answer

6 times faster

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√6 times faster

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√6 times slower

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At correct rate

Question 25

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

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Pressure only

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Neither pressure nor density

Answer

Both pressure and density

Answer

Density only

Question 26

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

Answer

Oscillation

Answer

None of these

Question 27

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

Answer

Displacement is maximum

Answer

Half way between them

Answer

Crossing mean position

Question 28

28. 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 29

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

Answer

Wavelength

Answer

None of these

Question 30

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

Answer

Wave mechanics

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 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 32

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

Answer

Beats phenomena

Answer

All of these

Answer

Doppler effect

Answer

Interference of waves

Question 33

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

Answer

Wave length

Answer

Phase difference

Question 34

34. 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 35

35. 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 36

36. 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 37

37. The velocity of sound in air depends upon

Answer

Wavelength of sound

Answer

Amplitude and frequency of sound

Answer

Density and elasticity of gas

Question 38

38. 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

Answer

Extra supersonic speed

Answer

Supersonic speed

Question 39

39. 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 40

40. 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 41

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

Answer

Quadruple the mass

Answer

Double the mass

Answer

Reduce the mass to one fourth

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Half the mass

Question 42

42. 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 decrease

Answer

Time period will not change

Answer

Time period will increase

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Time period will depend on the weight of the boy.

Question 43

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

Answer

Transverse stationary

Answer

Longitudinal progressive

Answer

Longitudinal stationary

Answer

Transverse progressive

Question 44

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

Answer

A straight line

Answer

An ellipse

Answer

A hyperbola

Question 45

45. In vibratory motion which parameter remains constant?

Answer

P.E. Energy

Answer

Total Energy

Answer

K.E. Energy

Answer

Angular Momentum

Question 46

46. Sound waves do not travel in vacuum because

Answer

They are transverse waves

Answer

They require material medium for propagation

Answer

They do not have enough energy

Answer

They are stationary waves

Question 47

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

Answer

Ultra-violet rays

Answer

Gamma rays

Answer

Infra-red radiation

Answer

Visible light

Question 48

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

Answer

Diffraction

Answer

Interference

Answer

Refraction

Answer

Polarization

Question 49

49. Beats are the results of

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Answer

Polarization

Answer

Destructive interference

Question 50

50. 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 51

51. For production of beats the two sources must have

Answer

Different frequencies and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies

Answer

Different frequencies, same amplitude and same phase

Question 52

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

Answer

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Answer

2,000 to 4,000 Hz

Answer

3,000 to 6,000 Hz

Question 53

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

Answer

The atmospheric pressure

Answer

Moisture contents in air

Answer

The composition of air

Answer

Temperature of air

Question 54

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

Answer

Interference

Answer

Reflection

Answer

Polarization

Answer

Refraction

Question 55

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

Question 56

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

Question 57

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

Answer

Energy and linear momentum

Answer

Energy and mass

Answer

Energy, momentum and mass

Question 58

58. In simple harmonic motion,

Answer

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

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

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

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Cannot be polarized

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Do not affect photographic plate

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Have a lower frequency

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Cannot be diffracted

Question 60

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

Answer

Electromagnetic waves

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Mechanical waves

Answer

Carrier waves

Answer

Matter waves

Question 61

61. Waves transmit _________ from one place to another

Answer

None of these

Question 62

62. 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 63

63. 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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Half that of the individual waves

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Twice that of the individual waves

Question 64

64. 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

Answer 165

Becomes one half

Answer 166

Become one fourth

Answer 167

Remains same

Answer 168

Becomes double

Answer 169

Remains unchanged

Answer 170

Becomes zero

Answer 171

Applied periodic force is small

Answer 172

Damping force is small

Answer 173

Restoring force is small

Answer 174

Quality factor is small

Answer 175

Energy is minimum at nodes and maximum at antidotes

Answer 176

Energy is uniformly distributed

Answer 177

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 178

Energy is minimum at nodes and maximum at antinodes

Answer 179

None of these

Answer 180

Longitudinal waves

Answer 181

Progressive wave

Answer 182

Transverse wave

Answer 183

Remains constant

Answer 184

Becomes Zero

Answer 185

Destructive interference

Answer 186

Constructive interference

Answer 187

1/f seconds

Answer 188

1/T seconds

Answer 189

1214 ms¯¹

Answer 190

1483 ms¯¹

Answer 191

1343 ms¯¹

Answer 192

1567 ms¯¹

Answer 193

x-ray radiation capacity

Answer 194

Sound loudness

Answer 195

Intensity of light

Answer 196

Energy of radiation

Answer 197

Reproduction of music

Answer 198

Reproduction of original sound

Answer 199

Reproduction of a CD from original copy

Answer 200

Reproduction of original image

Answer 201

Independent of x

Answer 202

Transverse

Answer 203

Longitudinal

Answer 204

Stationary

Answer 205

Electromagnetic

Answer 206

Diffraction

Answer 207

Refraction

Answer 208

Reflection

Answer 209

Polarization

Answer 210

Frequency and velocity

Answer 211

Intensity and velocity

Answer 212

Intensity and frequency

Answer 213

Frequency and number of harmonic

Answer 214

The elastic property as well as the inertia property

Answer 215

The elastic property but not on the inertia property

Answer 216

The inertia property but not on the elastic property

Answer 217

Neither the elastic property nor the inertia property

Answer 218

None of these

Answer 219

Out of phase

Answer 220

Sometimes in phase

Answer 221

4π second

Answer 222

2π second

Answer 223

(k₁+k₂)/2

Answer 224

k₁ k₂/( k₁+k₂)

Answer 225

√k₁k₂

Answer 226

Rectilinear Motion

Answer 227

Angular Motion

Answer 228

Simple Harmonic Motion

Answer 229

Circular Motion

Answer 230

Sound waves

Answer 231

Light waves

Answer 232

All of these

Answer 233

Water waves

Answer 234

Exponential

Answer 235

Logarithmic

Answer 236

Hyperbolic

Answer 237

Stationary waves

Answer 238

Electromagnetic waves

Answer 239

Longitudinal vibration

Answer 240

Transverse progressive waves

Answer 241

None of these

Answer 242

Increased rapidly

Answer 243

Reverberation

Answer 244

Oscillation Time

Answer 245

Time period

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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