Physics Waves Online Mcqs Test

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Question 1

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

Answer

All of these

Answer

Doppler effect

Answer

Interference of waves

Answer

Beats phenomena

Question 2

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

Answer

No apparent change in frequency

Answer

An apparent decrease in wavelength

Answer

An apparent increase in frequency

Answer

An apparent decrease in frequency

Question 3

3. The distance between node and antinode is

Question 4

4. 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 5

5. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 6

6. Waves transmit _________ from one place to another

Answer

None of these

Question 7

7. 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 increase

Answer

Time period will decrease

Answer

Time period will depend on the weight of the boy.

Question 8

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

Answer

Wavelength

Answer

None of these

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

Remain unaffected

Answer

Become infinite

Question 10

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

Answer

Increased rapidly

Answer

None of these

Question 11

11. Doppler-effect applies to

Answer

Neither sound nor light wave

Answer

Both sound and light waves

Answer

Sound wave only

Answer

Light wave only

Question 12

12. 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 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

Answer

When v is zero, α is zero

Question 13

13. 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 14

14. Decibel is unit of

Answer

x-ray radiation capacity

Answer

Sound loudness

Answer

Intensity of light

Answer

Energy of radiation

Question 15

15. In simple harmonic motion,

Answer

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

Answer

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

Question 16

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

Answer

Reflection

Answer

Interference

Answer

Polarization

Answer

Refraction

Question 17

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

Answer

Amplitude of motion will be every small

Answer

Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be very large

Question 18

18. 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 19

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

Question 20

20. Sound waves in air always

Answer

Longitudinal

Answer

Stationary

Answer

Electromagnetic

Answer

Transverse

Question 21

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

Answer

Sonic speed

Answer

Extra supersonic speed

Answer

None of these

Answer

Supersonic speed

Question 22

22. 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 23

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

Question 24

24. The distance between node and anti-node is

Question 25

25. Beats are the results of

Answer

Destructive interference

Answer

Constrictive and destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Question 26

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

Answer

Rectilinear Motion

Answer

Circular Motion

Answer

Angular Motion

Answer

Simple Harmonic Motion

Question 27

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

Answer

None of these

Answer

Oscillation

Question 28

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

Answer

2π second

Answer

4π second

Question 29

29. 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 30

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

Answer

Transverse progressive

Answer

Longitudinal progressive

Answer

Longitudinal stationary

Answer

Transverse stationary

Question 31

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

Answer

1/f seconds

Answer

1/T seconds

Question 32

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

Answer

Same as that of the individual waves

Answer

Twice that of the individual waves

Answer

√2 that of the individual waves

Answer

Half that of the individual waves

Question 33

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

Answer

None of these

Answer

Out of phase

Answer

Sometimes in phase

Question 34

34. Two springs of spring constants k₁ and k₂ are joined in series. The effective spring constant of the combination is given by

Answer

√k₁k₂

Answer

(k₁+k₂)/2

Answer

k₁ k₂/( k₁+k₂)

Question 35

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

Answer

Maximum in the extreme position

Answer

None of these

Answer

Zero in the mean position

Question 36

36. 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 37

37. Fidelity refers to

Answer

Reproduction of original image

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original sound

Answer

Reproduction of music

Question 38

38. What sort of waves exhibit the Doppler effect?

Answer

Light waves

Answer

All of these

Answer

Water waves

Answer

Sound waves

Question 39

39. 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 40

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

Answer

Half way between them

Answer

Displacement is maximum

Answer

Crossing mean position

Question 41

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

Question 42

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

Answer

Damping force is small

Answer

Quality factor is small

Answer

Restoring force is small

Answer

Applied periodic force is small

Question 43

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

Answer

The energy is redistributed and the distribution remains constant with time

Answer

There is a loss of energy

Answer

There is a gain of energy

Answer

The energy is redistributed and the distribution changes with time

Question 44

44. The Doppler effect is produced if

Answer

The detector is in motion

Answer

The source is in motion

Answer

None of these

Answer

Both the above

Question 45

45. Sound waves do not travel in vacuum because

Answer

They are transverse waves

Answer

They do not have enough energy

Answer

They require material medium for propagation

Answer

They are stationary waves

Question 46

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

Answer

2,000 to 4,000 Hz

Answer

3,000 to 6,000 Hz

Answer

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Question 47

47. 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 48

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

Answer

Hyperbolic

Answer

Logarithmic

Answer

Exponential

Question 49

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

Question 50

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

Question 51

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

Question 52

52. The speed of sound in a medium depends on

Answer

Neither the elastic property nor the inertia property

Answer

The elastic property but not on the inertia property

Answer

The inertia property but not on the elastic property

Answer

The elastic property as well as the inertia property

Question 53

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

Answer

Phase difference

Answer

Wave length

Question 54

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

Answer

Half the mass

Answer

Reduce the mass to one fourth

Answer

Double the mass

Answer

Quadruple the mass

Question 55

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

Question 56

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

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Do not affect photographic plate

Question 57

57. 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

300 Nm¯¹

Answer

700 Nm¯¹

Answer

100 Nm¯¹

Answer

143 Nm¯¹

Question 58

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

Answer

Interference

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Question 59

59. A system under going force vibrations is known as

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Driven harmonic oscillator

Question 60

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

Question 61

61. 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 62

62. 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 63

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

Answer

Becomes Zero

Answer

Remains constant

Question 64

64. In stationary waves

Answer

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

Answer

Energy is uniformly distributed

Answer 164

Intensity and velocity

Answer 165

Frequency and velocity

Answer 166

Frequency and number of harmonic

Answer 167

Intensity and frequency

Answer 168

Time period

Answer 169

Oscillation Time

Answer 170

Reverberation

Answer 171

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 172

Energy is minimum at nodes and maximum at antinodes

Answer 173

Energy is uniformly distributed

Answer 174

Energy is minimum at nodes and maximum at antidotes

Answer 175

Polarization

Answer 176

Diffraction

Answer 177

Refraction

Answer 178

Reflection

Answer 179

Electromagnetic waves

Answer 180

Matter waves

Answer 181

Carrier waves

Answer 182

Mechanical waves

Answer 183

Different frequencies and same amplitude

Answer 184

Different frequencies and same phase

Answer 185

Different frequencies

Answer 186

Different frequencies, same amplitude and same phase

Answer 187

Periodic waves

Answer 188

None of these

Answer 189

Progressive waves

Answer 190

Mechanical waves

Answer 191

Doppler effect

Answer 192

Beat phenomenon

Answer 193

Interference

Answer 194

Stationary waves

Answer 195

Electromagnetic waves

Answer 196

Longitudinal vibration

Answer 197

Transverse progressive waves

Answer 198

Has a definite quality

Answer 199

Has a definite capacity

Answer 200

Can penetrate the wall

Answer 201

Has a definite pitch

Answer 202

1214 ms¯¹

Answer 203

1567 ms¯¹

Answer 204

1483 ms¯¹

Answer 205

1343 ms¯¹

Answer 206

6 times faster

Answer 207

At correct rate

Answer 208

√6 times faster

Answer 209

√6 times slower

Answer 210

Independent of x

Answer 211

Neither pressure nor density

Answer 212

Pressure only

Answer 213

Density only

Answer 214

Both pressure and density

Answer 215

The atmospheric pressure

Answer 216

Moisture contents in air

Answer 217

The composition of air

Answer 218

Temperature of air

Answer 219

Becomes zero

Answer 220

Remains unchanged

Answer 221

Density and elasticity of gas

Answer 222

Wavelength of sound

Answer 223

Amplitude and frequency of sound

Answer 224

Wave mechanics

Answer 225

P.E. Energy

Answer 226

Angular Momentum

Answer 227

K.E. Energy

Answer 228

Total Energy

Answer 229

Increases or decreases depending on the material

Answer 230

Remains same

Answer 231

Energy and mass

Answer 232

Energy and linear momentum

Answer 233

Energy, momentum and mass

Answer 234

Longitudinal waves

Answer 235

Progressive wave

Answer 236

Transverse wave

Answer 237

None of these

Answer 238

Becomes one half

Answer 239

Become one fourth

Answer 240

Remains same

Answer 241

Becomes double

Answer 242

Smaller elastic modules

Answer 243

Large elastic modulus

Answer 244

Zero elastic modulus

Answer 245

None of these

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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