Physics Waves Online Mcqs Test

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Question 1

1. What sort of waves exhibit the Doppler effect?

Answer

Light waves

Answer

Water waves

Answer

All of these

Answer

Sound waves

Question 2

2. 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 3

3. 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 4

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

Answer

Remains unchanged

Answer

Becomes zero

Question 5

5. 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 capacity

Answer

Can penetrate the wall

Answer

Has a definite pitch

Answer

Has a definite quality

Question 6

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

Question 7

7. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 8

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

Answer

Increased rapidly

Answer

None of these

Question 9

9. Doppler-effect applies to

Answer

Both sound and light waves

Answer

Sound wave only

Answer

Neither sound nor light wave

Answer

Light wave only

Question 10

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

Answer

Carrier waves

Answer

Matter waves

Answer

Mechanical waves

Answer

Electromagnetic waves

Question 11

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

Answer

Doppler effect

Answer

Interference

Answer

Beat phenomenon

Question 12

12. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

Total Energy

Answer

P.E. Energy

Answer

Angular Momentum

Question 13

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

Answer

Temperature of air

Answer

The composition of air

Answer

The atmospheric pressure

Answer

Moisture contents in air

Question 14

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

Question 15

15. 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

Becomes double

Answer

Become one fourth

Question 16

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

Answer

Independent of x

Question 19

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

Answer

2π second

Answer

4π second

Question 20

20. 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

When v is maximum, α is zero

Answer

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

Answer

When v is zero, α is zero

Question 21

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

Answer

Simple Harmonic Motion

Answer

Circular Motion

Answer

Angular Motion

Answer

Rectilinear Motion

Question 22

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

Answer

1/T seconds

Answer

1/f seconds

Question 23

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

Answer

None of these

Answer

Zero in the mean position

Answer

Maximum in the extreme position

Question 24

24. The velocity of sound is greatest in

Question 25

25. 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 26

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

Answer

None of these

Answer

Supersonic speed

Answer

Extra supersonic speed

Answer

Sonic speed

Question 27

27. 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

Independent of amplitude of motion

Answer

None of these

Question 28

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

Question 29

29. 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 30

30. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

None of these

Answer

Mechanical waves

Answer

Periodic waves

Question 31

31. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Destructive interference

Answer

Polarization

Answer

Diffraction of sound waves

Question 32

32. 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 33

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

Answer

Infra-red radiation

Answer

Ultra-violet rays

Answer

Gamma rays

Answer

Visible light

Question 34

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

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Answer

Reflection

Question 35

35. The distance between node and antinode is

Question 36

36. Sound waves in air always

Answer

Longitudinal

Answer

Electromagnetic

Answer

Transverse

Answer

Stationary

Question 37

37. The distance between node and anti-node is

Question 38

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

Question 39

39. The Doppler effect is produced if

Answer

Both the above

Answer

The source is in motion

Answer

The detector is in motion

Answer

None of these

Question 40

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

Answer

At correct rate

Answer

√6 times faster

Answer

√6 times slower

Answer

6 times faster

Question 41

41. The speed of sound in a medium depends on

Answer

The elastic property but not on the inertia property

Answer

The elastic property as well as the inertia property

Answer

Neither the elastic property nor the inertia property

Answer

The inertia property but not on the elastic property

Question 42

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

Answer

Wave length

Answer

Phase difference

Question 43

43. 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 44

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

Answer

Transverse progressive

Answer

Transverse stationary

Answer

Longitudinal stationary

Answer

Longitudinal progressive

Question 45

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

Answer

None of these

Answer

Wavelength

Question 46

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

Answer

Both pressure and density

Answer

Neither pressure nor density

Answer

Density only

Answer

Pressure only

Question 47

47. 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 48

48. In simple harmonic motion,

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

Answer

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

Answer

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

Question 49

49. 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

Answer

Cannot be diffracted

Question 50

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

Answer

All of these

Answer

Beats phenomena

Answer

Interference of waves

Answer

Doppler effect

Question 51

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

Answer

Restoring force is small

Answer

Applied periodic force is small

Answer

Damping force is small

Answer

Quality factor is small

Question 52

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

Answer

Logarithmic

Answer

Hyperbolic

Answer

Exponential

Question 53

53. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 54

54. 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 55

55. 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

5 β – 4 α

Answer

9 (β – α)

Question 56

56. Sound waves do not travel in vacuum because

Answer

They are transverse waves

Answer

They do not have enough energy

Answer

They are stationary waves

Answer

They require material medium for propagation

Question 57

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

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Answer

1483 ms¯¹

Answer

1214 ms¯¹

Question 58

58. Decibel is unit of

Answer

x-ray radiation capacity

Answer

Intensity of light

Answer

Energy of radiation

Answer

Sound loudness

Question 59

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

Question 60

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 61

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

Answer

Remains constant

Answer

Becomes Zero

Question 62

62. 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 63

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

Question 64

64. Waves transmit _________ from one place to another

Answer

None of these

Answer 173

Refraction

Answer 174

Diffraction

Answer 175

Interference

Answer 176

Polarization

Answer 177

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 178

Energy is uniformly distributed

Answer 179

Energy is maximum at nodes and minimum at antidotes

Answer 180

Energy is minimum at nodes and maximum at antinodes

Answer 181

Reproduction of original image

Answer 182

Reproduction of a CD from original copy

Answer 183

Reproduction of music

Answer 184

Reproduction of original sound

Answer 185

Out of phase

Answer 186

Sometimes in phase

Answer 187

None of these

Answer 188

√k₂/k₁

Answer 189

√k₁/k₂

Answer 190

Longitudinal waves

Answer 191

Transverse wave

Answer 192

Progressive wave

Answer 193

None of these

Answer 194

700 Nm¯¹

Answer 195

143 Nm¯¹

Answer 196

100 Nm¯¹

Answer 197

300 Nm¯¹

Answer 198

Wave mechanics

Answer 199

Longitudinal vibration

Answer 200

Stationary waves

Answer 201

Transverse progressive waves

Answer 202

Electromagnetic waves

Answer 203

The energy is redistributed and the distribution remains constant with time

Answer 204

There is a loss of energy

Answer 205

The energy is redistributed and the distribution changes with time

Answer 206

There is a gain of energy

Answer 207

Remains same

Answer 208

Become zero

Answer 209

Different frequencies and same phase

Answer 210

Different frequencies

Answer 211

Different frequencies, same amplitude and same phase

Answer 212

Different frequencies and same amplitude

Answer 213

Oscillation

Answer 214

None of these

Answer 215

An apparent decrease in frequency

Answer 216

An apparent increase in frequency

Answer 217

No apparent change in frequency

Answer 218

An apparent decrease in wavelength

Answer 219

Become infinite

Answer 220

Remain unaffected

Answer 221

2,000 to 4,000 Hz

Answer 222

5,000 to 11,000 Hz

Answer 223

3,000 to 6,000 Hz

Answer 224

4,000 to 8,000 Hz

Answer 225

Reverberation

Answer 226

Oscillation Time

Answer 227

Time period

Answer 228

Reflection

Answer 229

Interference

Answer 230

Polarization

Answer 231

Refraction

Answer 232

None of these

Answer 233

Smaller elastic modules

Answer 234

Zero elastic modulus

Answer 235

Large elastic modulus

Answer 236

Half way between them

Answer 237

Crossing mean position

Answer 238

Displacement is maximum

Answer 239

Energy and linear momentum

Answer 240

Energy, momentum and mass

Answer 241

Energy and mass

Answer 242

Twice that of the individual waves

Answer 243

Half that of the individual waves

Answer 244

√2 that of the individual waves

Answer 245

Same as that of the individual waves

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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