Physics Waves Online Mcqs Test

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Question 1

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

Answer

Reduce the mass to one fourth

Answer

Quadruple the mass

Answer

Half the mass

Answer

Double the mass

Question 2

2. 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 3

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

Answer

The composition of air

Answer

Moisture contents in air

Answer

The atmospheric pressure

Answer

Temperature of air

Question 4

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

Answer

Time period

Answer

Oscillation Time

Answer

Reverberation

Question 5

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

Answer

1567 ms¯¹

Answer

1214 ms¯¹

Answer

1343 ms¯¹

Answer

1483 ms¯¹

Question 6

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

Answer

Refraction

Answer

Polarization

Answer

Interference

Answer

Diffraction

Question 7

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

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and velocity

Answer

Frequency and number of harmonic

Question 8

8. Fidelity refers to

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original image

Answer

Reproduction of music

Answer

Reproduction of original sound

Question 9

9. Sound waves in air always

Answer

Longitudinal

Answer

Electromagnetic

Answer

Stationary

Answer

Transverse

Question 10

10. In case of a vibrating Pendulum, if the mass of the pendulum is doubled then its time period

Answer

Remains same

Answer

Becomes one half

Answer

Becomes double

Answer

Become one fourth

Question 11

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

Question 12

12. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Question 13

13. 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 14

14. Beats are the results of

Answer

Polarization

Answer

Destructive interference

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Question 15

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

Question 16

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

Answer

Gamma rays

Answer

Infra-red radiation

Answer

Visible light

Answer

Ultra-violet rays

Question 17

17. 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 18

18. 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 19

19. In stationary waves

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Question 20

20. The distance between node and anti-node is

Question 21

21. What sort of waves exhibit the Doppler effect?

Answer

Light waves

Answer

Water waves

Answer

All of these

Answer

Sound waves

Question 22

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

Answer

Logarithmic

Answer

Hyperbolic

Answer

Exponential

Question 23

23. 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.

Answer

Time period will not change

Answer

Time period will decrease

Answer

Time period will increase

Question 24

24. In vibratory motion which parameter remains constant?

Answer

Total Energy

Answer

K.E. Energy

Answer

Angular Momentum

Answer

P.E. Energy

Question 25

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

Answer

2π second

Answer

4π second

Question 26

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 27

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

Answer

Oscillation

Answer

None of these

Question 28

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

Answer

Wavelength

Answer

None of these

Question 29

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

Question 30

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

Answer

Independent of x

Question 31

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

Answer

Both pressure and density

Answer

Density only

Answer

Neither pressure nor density

Answer

Pressure only

Question 32

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

Answer

Transverse wave

Answer

Longitudinal waves

Answer

Progressive wave

Answer

None of these

Question 33

33. The distance between node and antinode is

Question 34

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

Answer

Have a lower frequency

Answer

Do not affect photographic plate

Answer

Cannot be polarized

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Cannot be diffracted

Question 35

35. Decibel is unit of

Answer

Sound loudness

Answer

Intensity of light

Answer

Energy of radiation

Answer

x-ray radiation capacity

Question 36

36. The gases have a

Answer

Large elastic modulus

Answer

None of these

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Question 37

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

Answer

Refraction

Answer

Reflection

Answer

Interference

Answer

Polarization

Question 38

38. 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 39

39. 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 zero

Answer

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

Answer

When v is maximum, α is maximum

Question 40

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

Question 41

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

Answer

All of these

Answer

Interference of waves

Answer

Beats phenomena

Answer

Doppler effect

Question 42

42. 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 43

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

Question 44

44. Doppler-effect applies to

Answer

Sound wave only

Answer

Neither sound nor light wave

Answer

Both sound and light waves

Answer

Light wave only

Question 45

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

Question 46

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

Answer

Angular Motion

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Answer

Circular Motion

Question 47

47. 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

5 β – 4 α

Answer

5α – 4β

Answer

9 (β – α)

Question 48

48. 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 49

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

Question 50

50. An oscillating mass-spring system generates

Answer

None of these

Answer

Mechanical waves

Answer

Periodic waves

Answer

Progressive waves

Question 51

51. For production of beats the two sources must have

Answer

Different frequencies

Answer

Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same amplitude

Question 52

52. The velocity of sound is greatest in

Question 53

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

Answer

Half that of the individual waves

Answer

√2 that of the individual waves

Answer

Same as that of the individual waves

Answer

Twice that of the individual waves

Question 54

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

Answer

Phase difference

Answer

Wave length

Question 55

55. The Doppler effect is produced if

Answer

Both the above

Answer

The source is in motion

Answer

None of these

Answer

The detector is in motion

Question 56

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

Answer

An ellipse

Answer

A hyperbola

Answer

A straight line

Question 57

57. 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 58

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

Answer

None of these

Answer

Increased rapidly

Question 59

59. 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 quality

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Can penetrate the wall

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Has a definite pitch

Answer

Has a definite capacity

Question 60

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

Question 61

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

Answer

Mechanical waves

Answer

Carrier waves

Answer

Electromagnetic waves

Answer

Matter waves

Question 62

62. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They require material medium for propagation

Answer

They are stationary waves

Answer

They are transverse waves

Question 63

63. Energy is not carried by

Answer

Transverse progressive waves

Answer

Longitudinal vibration

Answer

Electromagnetic waves

Answer

Stationary waves

Question 64

64. 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

At correct rate

Answer

6 times faster

Answer 178

Become zero

Answer 179

Remains same

Answer 180

Amplitude of motion will be very large

Answer 181

Amplitude of motion will be every small

Answer 182

None of these

Answer 183

Independent of amplitude of motion

Answer 184

The elastic property as well as the inertia property

Answer 185

Neither the elastic property nor the inertia property

Answer 186

The elastic property but not on the inertia property

Answer 187

The inertia property but not on the elastic property

Answer 188

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

Answer 189

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

Answer 190

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

Answer 191

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

Answer 192

Driven harmonic oscillator

Answer 193

Frequency harmonic oscillator

Answer 194

Vibration harmonic oscillator

Answer 195

None of these

Answer 196

Zero in the mean position

Answer 197

Maximum in the extreme position

Answer 198

None of these

Answer 199

Energy and linear momentum

Answer 200

Energy, momentum and mass

Answer 201

Energy and mass

Answer 202

Doppler effect

Answer 203

Interference

Answer 204

Beat phenomenon

Answer 205

2,000 to 4,000 Hz

Answer 206

5,000 to 11,000 Hz

Answer 207

3,000 to 6,000 Hz

Answer 208

4,000 to 8,000 Hz

Answer 209

None of these

Answer 210

Sometimes in phase

Answer 211

Out of phase

Answer 212

Refraction

Answer 213

Diffraction

Answer 214

Reflection

Answer 215

Polarization

Answer 216

Destructive interference

Answer 217

Constructive interference

Answer 218

Extra supersonic speed

Answer 219

Supersonic speed

Answer 220

None of these

Answer 221

Sonic speed

Answer 222

Wave mechanics

Answer 223

Becomes Zero

Answer 224

Remains constant

Answer 225

There is a loss of energy

Answer 226

The energy is redistributed and the distribution changes with time

Answer 227

The energy is redistributed and the distribution remains constant with time

Answer 228

There is a gain of energy

Answer 229

Crossing mean position

Answer 230

Half way between them

Answer 231

Displacement is maximum

Answer 232

143 Nm¯¹

Answer 233

100 Nm¯¹

Answer 234

300 Nm¯¹

Answer 235

700 Nm¯¹

Answer 236

An apparent decrease in wavelength

Answer 237

An apparent increase in frequency

Answer 238

No apparent change in frequency

Answer 239

An apparent decrease in frequency

Answer 240

Remains unchanged

Answer 241

Becomes zero

Answer 242

Remain unaffected

Answer 243

Become infinite

Answer 244

1/T seconds

Answer 245

1/f seconds

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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