Physics Waves Online Mcqs Test

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Question 1

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

Answer

An apparent increase in frequency

Answer

No apparent change in frequency

Answer

An apparent decrease in frequency

Answer

An apparent decrease in wavelength

Question 2

2. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Mechanical waves

Answer

Periodic waves

Answer

None of these

Question 3

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

Answer

None of these

Answer

Transverse wave

Answer

Progressive wave

Answer

Longitudinal waves

Question 4

4. 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 5

5. 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 6

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

Question 7

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

Answer

Beats phenomena

Answer

Doppler effect

Answer

All of these

Answer

Interference of waves

Question 8

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

Answer

2,000 to 4,000 Hz

Answer

5,000 to 11,000 Hz

Answer

3,000 to 6,000 Hz

Answer

4,000 to 8,000 Hz

Question 9

9. 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 increase

Answer

Time period will not change

Answer

Time period will decrease

Question 10

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

Answer

Amplitude of motion will be very large

Answer

Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be every small

Question 11

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

Answer

√2 that of the individual waves

Answer

Twice that of the individual waves

Answer

Half that of the individual waves

Answer

Same as that of the individual waves

Question 12

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

Answer

Wave mechanics

Question 13

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

Answer

Independent of x

Question 14

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

Answer

Neither pressure nor density

Answer

Density only

Answer

Both pressure and density

Answer

Pressure only

Question 15

15. The velocity of sound is greatest in

Question 16

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

Answer

Refraction

Answer

Reflection

Answer

Polarization

Answer

Diffraction

Question 17

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

Answer

Polarization

Answer

Interference

Answer

Reflection

Answer

Refraction

Question 18

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

Answer

Do not affect photographic plate

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Cannot be polarized

Question 19

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

Question 20

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

Question 21

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

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Answer

1214 ms¯¹

Answer

1483 ms¯¹

Question 22

22. 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 slower

Answer

√6 times faster

Answer

6 times faster

Question 23

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

Answer

Time period

Answer

Reverberation

Answer

Oscillation Time

Question 24

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

Question 25

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

Answer

Oscillation

Answer

None of these

Question 26

26. 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

Has a definite quality

Answer

Can penetrate the wall

Answer

Has a definite pitch

Question 27

27. Beats are the results of

Answer

Destructive interference

Answer

Polarization

Answer

Constrictive and destructive interference

Answer

Diffraction of sound waves

Question 28

28. 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 29

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

Answer

Logarithmic

Answer

Exponential

Answer

Hyperbolic

Question 30

30. 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 31

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

Question 32

32. The gases have a

Answer

Large elastic modulus

Answer

Zero elastic modulus

Answer

Smaller elastic modules

Answer

None of these

Question 33

33. Sound waves do not travel in vacuum because

Answer

They require material medium for propagation

Answer

They do not have enough energy

Answer

They are stationary waves

Answer

They are transverse waves

Question 34

34. Energy is not carried by

Answer

Stationary waves

Answer

Electromagnetic waves

Answer

Transverse progressive waves

Answer

Longitudinal vibration

Question 35

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

Answer

Energy and mass

Answer

Energy, momentum and mass

Answer

Energy and linear momentum

Question 36

36. 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 37

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

Answer

Displacement is maximum

Answer

Crossing mean position

Answer

Half way between them

Question 38

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

Answer

None of these

Answer

Wavelength

Question 39

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

Question 40

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

Answer

Wave length

Answer

Phase difference

Question 41

41. 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 42

42. 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 43

43. The velocity of sound in air depends upon

Answer

Wavelength of sound

Answer

Density and elasticity of gas

Answer

Amplitude and frequency of sound

Question 44

44. 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 45

45. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

K.E. Energy

Answer

P.E. Energy

Answer

Total Energy

Question 46

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

Answer

Mechanical waves

Answer

Matter waves

Answer

Electromagnetic waves

Answer

Carrier waves

Question 47

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

Question 48

48. What sort of waves exhibit the Doppler effect?

Answer

Sound waves

Answer

Light waves

Answer

Water waves

Answer

All of these

Question 49

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

Answer

1/T seconds

Answer

1/f seconds

Question 50

50. 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 51

51. The distance between node and antinode is

Question 52

52. 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 53

53. Velocity of sound in vacuum is

Question 54

54. Fidelity refers to

Answer

Reproduction of original sound

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original image

Answer

Reproduction of music

Question 55

55. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is uniformly distributed

Question 56

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

Answer

Frequency and velocity

Answer

Intensity and velocity

Answer

Frequency and number of harmonic

Answer

Intensity and frequency

Question 57

57. 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 58

58. 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)/2

Answer

k₁ k₂/( k₁+k₂)

Answer

√k₁k₂

Question 59

59. In stationary waves

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Question 60

60. Waves transmit _________ from one place to another

Answer

None of these

Question 61

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

Answer

Become one fourth

Answer

Becomes one half

Answer

Remains same

Answer

Becomes double

Question 62

62. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Question 63

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

Answer

Applied periodic force is small

Answer

Quality factor is small

Answer

Damping force is small

Answer

Restoring force is small

Question 64

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

Answer

The energy is redistributed and the distribution changes with time

Answer

There is a gain of energy

Answer

There is a loss of energy

Answer

The energy is redistributed and the distribution remains constant with time

Answer 167

None of these

Answer 168

Increased rapidly

Answer 169

Remains constant

Answer 170

Becomes Zero

Answer 171

Beat phenomenon

Answer 172

Interference

Answer 173

Doppler effect

Answer 174

Maximum in the extreme position

Answer 175

Zero in the mean position

Answer 176

None of these

Answer 177

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

Answer 178

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

Answer 179

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

Answer 180

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

Answer 181

Polarization

Answer 182

Refraction

Answer 183

Diffraction

Answer 184

Interference

Answer 185

Electromagnetic

Answer 186

Stationary

Answer 187

Transverse

Answer 188

Longitudinal

Answer 189

Temperature of air

Answer 190

The composition of air

Answer 191

The atmospheric pressure

Answer 192

Moisture contents in air

Answer 193

When v is maximum, α is maximum

Answer 194

When v is zero, α is zero

Answer 195

When v is maximum, α is zero

Answer 196

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

Answer 197

The elastic property but not on the inertia property

Answer 198

The elastic property as well as the inertia property

Answer 199

The inertia property but not on the elastic property

Answer 200

Neither the elastic property nor the inertia property

Answer 201

Constructive interference

Answer 202

Destructive interference

Answer 203

Supersonic speed

Answer 204

None of these

Answer 205

Extra supersonic speed

Answer 206

Sonic speed

Answer 207

Remains unchanged

Answer 208

Becomes zero

Answer 209

None of these

Answer 210

Out of phase

Answer 211

Sometimes in phase

Answer 212

Remains same

Answer 213

Increases or decreases depending on the material

Answer 214

Simple Harmonic Motion

Answer 215

Circular Motion

Answer 216

Angular Motion

Answer 217

Rectilinear Motion

Answer 218

700 Nm¯¹

Answer 219

100 Nm¯¹

Answer 220

143 Nm¯¹

Answer 221

300 Nm¯¹

Answer 222

Light wave only

Answer 223

Both sound and light waves

Answer 224

Sound wave only

Answer 225

Neither sound nor light wave

Answer 226

Reduce the mass to one fourth

Answer 227

Quadruple the mass

Answer 228

Double the mass

Answer 229

Half the mass

Answer 230

Remains same

Answer 231

Become zero

Answer 232

Sound loudness

Answer 233

x-ray radiation capacity

Answer 234

Energy of radiation

Answer 235

Intensity of light

Answer 236

Infra-red radiation

Answer 237

Gamma rays

Answer 238

Ultra-violet rays

Answer 239

Visible light

Answer 240

2π second

Answer 241

4π second

Answer 242

Longitudinal progressive

Answer 243

Transverse progressive

Answer 244

Longitudinal stationary

Answer 245

Transverse stationary

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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