Physics Waves Online Mcqs Test

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Question 1

1. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Destructive interference

Answer

Polarization

Answer

Diffraction of sound waves

Question 2

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

Answer

Refraction

Answer

Diffraction

Answer

Interference

Answer

Polarization

Question 3

3. 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 4

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

Answer

Interference

Answer

Polarization

Answer

Reflection

Answer

Refraction

Question 5

5. Sound waves in air always

Answer

Longitudinal

Answer

Transverse

Answer

Stationary

Answer

Electromagnetic

Question 6

6. 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 acceleration of the vibrating particle are in the same phase

Answer

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

Question 7

7. 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 8

8. 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)

Answer

√k₁k₂

Answer

(k₁+k₂)/2

Question 9

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

Question 10

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

Answer

1214 ms¯¹

Answer

1483 ms¯¹

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Question 11

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

Answer

The composition of air

Answer

Moisture contents in air

Answer

Temperature of air

Answer

The atmospheric pressure

Question 12

12. 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 13

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

Answer

Sometimes in phase

Answer

Out of phase

Answer

None of these

Question 14

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

Question 15

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

Answer

Cannot be polarized

Answer

Cannot be diffracted

Answer

Do not affect photographic plate

Answer

Have a lower frequency

Question 16

16. 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 17

17. 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 18

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

Question 19

19. 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 20

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

Answer

1/T seconds

Answer

1/f seconds

Question 21

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

Answer

Amplitude of motion will be very large

Answer

Amplitude of motion will be every small

Answer

None of these

Answer

Independent of amplitude of motion

Question 22

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

Answer

Transverse stationary

Answer

Transverse progressive

Answer

Longitudinal stationary

Answer

Longitudinal progressive

Question 23

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

Answer

Becomes zero

Answer

Remains unchanged

Question 24

24. The speed of sound in a medium depends on

Answer

The elastic property as well as the inertia property

Answer

The inertia property but not on the elastic property

Answer

Neither the elastic property nor the inertia property

Answer

The elastic property but not on the inertia property

Question 25

25. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 26

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

Answer

Increased rapidly

Answer

None of these

Question 27

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

Answer

Doppler effect

Answer

Beat phenomenon

Answer

Interference

Question 28

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

Answer

Wavelength

Answer

None of these

Question 29

29. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They are stationary waves

Answer

They are transverse waves

Answer

They require material medium for propagation

Question 30

30. 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

Answer

Becomes double

Question 31

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

Question 32

32. The velocity of sound in air depends upon

Answer

Amplitude and frequency of sound

Answer

Density and elasticity of gas

Answer

Wavelength of sound

Question 33

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

Question 34

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

Answer

Wave length

Answer

Phase difference

Question 35

35. An oscillating mass-spring system generates

Answer

Periodic waves

Answer

Progressive waves

Answer

Mechanical waves

Answer

None of these

Question 36

36. Decibel is unit of

Answer

x-ray radiation capacity

Answer

Sound loudness

Answer

Energy of radiation

Answer

Intensity of light

Question 37

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 38

38. One wavelength is the distance covered in a time is called

Answer

Reverberation

Answer

Oscillation Time

Answer

Time period

Question 39

39. 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 40

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

Answer

4π second

Answer

2π second

Question 41

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

Answer

Progressive wave

Answer

Longitudinal waves

Answer

None of these

Answer

Transverse wave

Question 42

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

Answer

Pressure only

Answer

Neither pressure nor density

Answer

Both pressure and density

Answer

Density only

Question 43

43. 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 44

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

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Answer

Half the mass

Answer

Double the mass

Question 45

45. 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

5α – 4β

Answer

5 β – 4 α

Question 46

46. Fidelity refers to

Answer

Reproduction of music

Answer

Reproduction of original sound

Answer

Reproduction of original image

Answer

Reproduction of a CD from original copy

Question 47

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

Answer

Logarithmic

Answer

Exponential

Answer

Hyperbolic

Question 48

48. In stationary waves

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 49

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

Answer

Wave mechanics

Question 50

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

Answer

Visible light

Answer

Ultra-violet rays

Answer

Infra-red radiation

Answer

Gamma rays

Question 51

51. Velocity of sound in vacuum is

Question 52

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

Answer

Becomes Zero

Answer

Remains constant

Question 53

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

Answer

Electromagnetic waves

Answer

Carrier waves

Answer

Mechanical waves

Answer

Matter waves

Question 54

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

Question 55

55. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

Angular Momentum

Answer

P.E. Energy

Answer

Total Energy

Question 56

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

Answer

A hyperbola

Answer

An ellipse

Answer

A straight line

Question 57

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

Question 58

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

Answer

Refraction

Answer

Reflection

Answer

Diffraction

Answer

Polarization

Question 59

59. 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

An apparent decrease in frequency

Answer

No apparent change in frequency

Question 60

60. 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

700 Nm¯¹

Answer

300 Nm¯¹

Answer

143 Nm¯¹

Question 61

61. The velocity of sound is greatest in

Question 62

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

Question 63

63. 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 depend on the weight of the boy.

Answer

Time period will increase

Question 64

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

Answer 164

Independent of x

Answer 165

Same as that of the individual waves

Answer 166

Twice that of the individual waves

Answer 167

Half that of the individual waves

Answer 168

√2 that of the individual waves

Answer 169

Sound waves

Answer 170

Light waves

Answer 171

Water waves

Answer 172

All of these

Answer 173

At correct rate

Answer 174

6 times faster

Answer 175

√6 times slower

Answer 176

√6 times faster

Answer 177

None of these

Answer 178

Zero elastic modulus

Answer 179

Large elastic modulus

Answer 180

Smaller elastic modules

Answer 181

Both the above

Answer 182

None of these

Answer 183

The detector is in motion

Answer 184

The source is in motion

Answer 185

Angular Motion

Answer 186

Simple Harmonic Motion

Answer 187

Rectilinear Motion

Answer 188

Circular Motion

Answer 189

Both sound and light waves

Answer 190

Neither sound nor light wave

Answer 191

Light wave only

Answer 192

Sound wave only

Answer 193

Longitudinal vibration

Answer 194

Transverse progressive waves

Answer 195

Electromagnetic waves

Answer 196

Stationary waves

Answer 197

4,000 to 8,000 Hz

Answer 198

2,000 to 4,000 Hz

Answer 199

3,000 to 6,000 Hz

Answer 200

5,000 to 11,000 Hz

Answer 201

None of these

Answer 202

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

Answer 203

When v is maximum, α is maximum

Answer 204

When v is maximum, α is zero

Answer 205

When v is zero, α is zero

Answer 206

Interference of waves

Answer 207

All of these

Answer 208

Beats phenomena

Answer 209

Doppler effect

Answer 210

Frequency and number of harmonic

Answer 211

Intensity and frequency

Answer 212

Intensity and velocity

Answer 213

Frequency and velocity

Answer 214

Become zero

Answer 215

Remains same

Answer 216

None of these

Answer 217

Maximum in the extreme position

Answer 218

Zero in the mean position

Answer 219

Can penetrate the wall

Answer 220

Has a definite pitch

Answer 221

Has a definite quality

Answer 222

Has a definite capacity

Answer 223

Restoring force is small

Answer 224

Quality factor is small

Answer 225

Damping force is small

Answer 226

Applied periodic force is small

Answer 227

Different frequencies and same amplitude

Answer 228

Different frequencies

Answer 229

Different frequencies, same amplitude and same phase

Answer 230

Different frequencies and same phase

Answer 231

Destructive interference

Answer 232

Constructive interference

Answer 233

There is a loss of energy

Answer 234

There is a gain of energy

Answer 235

The energy is redistributed and the distribution remains constant with time

Answer 236

The energy is redistributed and the distribution changes with time

Answer 237

Supersonic speed

Answer 238

Extra supersonic speed

Answer 239

Sonic speed

Answer 240

None of these

Answer 241

Oscillation

Answer 242

None of these

Answer 243

Vibration harmonic oscillator

Answer 244

Driven harmonic oscillator

Answer 245

Frequency harmonic oscillator

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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