Physics Waves Online Mcqs Test

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Question 1

1. A system under going force vibrations is known as

Answer

Vibration harmonic oscillator

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Frequency harmonic oscillator

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Driven harmonic oscillator

Question 2

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

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Independent of x

Question 3

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

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Visible light

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Gamma rays

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Ultra-violet rays

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Infra-red radiation

Question 4

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

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Increased rapidly

Answer

None of these

Question 5

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

Question 6

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

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k₁ k₂/( k₁+k₂)

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(k₁+k₂)/2

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√k₁k₂

Question 7

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

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Becomes zero

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Remains unchanged

Question 8

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

Question 9

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

Question 10

10. The Doppler effect is produced if

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None of these

Answer

Both the above

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The source is in motion

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The detector is in motion

Question 11

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

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The composition of air

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Temperature of air

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The atmospheric pressure

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Moisture contents in air

Question 12

12. The gases have a

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None of these

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Zero elastic modulus

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Large elastic modulus

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Smaller elastic modules

Question 13

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

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Intensity and frequency

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Intensity and velocity

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Frequency and velocity

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Frequency and number of harmonic

Question 14

14. Doppler-effect applies to

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Both sound and light waves

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Light wave only

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Sound wave only

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Neither sound nor light wave

Question 15

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

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Interference

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Beat phenomenon

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Doppler effect

Question 16

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

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√6 times faster

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√6 times slower

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At correct rate

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6 times faster

Question 17

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

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Angular Motion

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Rectilinear Motion

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Simple Harmonic Motion

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Circular Motion

Question 18

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

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A hyperbola

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An ellipse

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A straight line

Question 19

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

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Quality factor is small

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Damping force is small

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Restoring force is small

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Applied periodic force is small

Question 20

20. In vibratory motion which parameter remains constant?

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Total Energy

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P.E. Energy

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Angular Momentum

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K.E. Energy

Question 21

21. 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

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Become infinite

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Remain unaffected

Question 22

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

Question 23

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

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Hyperbolic

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Exponential

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Logarithmic

Question 24

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

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Half that of the individual waves

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Twice that of the individual waves

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Same as that of the individual waves

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√2 that of the individual waves

Question 25

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

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Time period

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Oscillation Time

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Reverberation

Question 26

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

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None of these

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Wavelength

Question 27

27. The velocity of sound in air depends upon

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Amplitude and frequency of sound

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Density and elasticity of gas

Answer

Wavelength of sound

Question 28

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

Question 29

29. Beats are the results of

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Polarization

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Destructive interference

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Diffraction of sound waves

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Constrictive and destructive interference

Question 30

30. Waves transmit _________ from one place to another

Answer

None of these

Question 31

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

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Crossing mean position

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Half way between them

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Displacement is maximum

Question 32

32. In stationary waves

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Energy is maximum at nodes and minimum at antidotes

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Energy is minimum at nodes and maximum at antinodes

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Energy is uniformly distributed

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Alternating maximum and minimum energy producing at nodes and antinodes

Question 33

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

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Refraction

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Interference

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Polarization

Answer

Diffraction

Question 34

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

Answer

Beats phenomena

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All of these

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Doppler effect

Answer

Interference of waves

Question 35

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

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Quadruple the mass

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Double the mass

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Half the mass

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Reduce the mass to one fourth

Question 36

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

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Do not affect photographic plate

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Cannot be diffracted

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Have a lower frequency

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Cannot be polarized

Question 37

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

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1/T seconds

Answer

1/f seconds

Question 38

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

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Progressive wave

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Longitudinal waves

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Transverse wave

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None of these

Question 39

39. 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

700 Nm¯¹

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143 Nm¯¹

Answer

100 Nm¯¹

Answer

300 Nm¯¹

Question 40

40. Which one of the following statements is true for the speed v and the acceleration α of a particle executing simple harmonic motion?

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When v is maximum, α is maximum

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When v is zero, α is zero

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When v is maximum, α is zero

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

Question 41

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

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Remains same

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Increases or decreases depending on the material

Question 42

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

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Become one fourth

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Becomes one half

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Remains same

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Becomes double

Question 43

43. An oscillating mass-spring system generates

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Mechanical waves

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Periodic waves

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Progressive waves

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None of these

Question 44

44. Fidelity refers to

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Reproduction of music

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Reproduction of original image

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Reproduction of original sound

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Reproduction of a CD from original copy

Question 45

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

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Becomes Zero

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Remains constant

Question 46

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

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Out of phase

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Sometimes in phase

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None of these

Question 47

47. What sort of waves exhibit the Doppler effect?

Answer

Water waves

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Sound waves

Answer

All of these

Answer

Light waves

Question 48

48. 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 49

49. The distance between node and antinode is

Question 50

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

Question 51

51. The distance between node and anti-node is

Question 52

52. 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

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Time period will decrease

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Time period will not change

Question 53

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

Question 54

54. Sound waves do not travel in vacuum because

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They do not have enough energy

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They are transverse waves

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They require material medium for propagation

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They are stationary waves

Question 55

55. For production of beats the two sources must have

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Different frequencies, same amplitude and same phase

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Different frequencies and same amplitude

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Different frequencies

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Different frequencies and same phase

Question 56

56. Silence zone takes place due to

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Destructive interference

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Constructive interference

Question 57

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

Answer

Wave mechanics

Question 58

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

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2π second

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4π second

Question 59

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

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5,000 to 11,000 Hz

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4,000 to 8,000 Hz

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3,000 to 6,000 Hz

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2,000 to 4,000 Hz

Question 60

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

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Zero in the mean position

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Maximum in the extreme position

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None of these

Question 61

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

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Wave length

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Phase difference

Question 62

62. 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.

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Has a definite quality

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Has a definite capacity

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Can penetrate the wall

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Has a definite pitch

Question 63

63. 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 64

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

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1567 ms¯¹

Answer

1214 ms¯¹

Answer

1343 ms¯¹

Answer

1483 ms¯¹

Answer 174

Mechanical waves

Answer 175

Carrier waves

Answer 176

Electromagnetic waves

Answer 177

Matter waves

Answer 178

5 β – 4 α

Answer 179

9 (β – α)

Answer 180

5α – 4β

Answer 181

Both pressure and density

Answer 182

Neither pressure nor density

Answer 183

Density only

Answer 184

Pressure only

Answer 185

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

Answer 186

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

Answer 187

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

Answer 188

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

Answer 189

Oscillation

Answer 190

None of these

Answer 191

Energy is uniformly distributed

Answer 192

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 193

Energy is minimum at nodes and maximum at antinodes

Answer 194

Energy is minimum at nodes and maximum at antidotes

Answer 195

An apparent decrease in wavelength

Answer 196

An apparent increase in frequency

Answer 197

No apparent change in frequency

Answer 198

An apparent decrease in frequency

Answer 199

Stationary waves

Answer 200

Transverse progressive waves

Answer 201

Longitudinal vibration

Answer 202

Electromagnetic waves

Answer 203

The energy is redistributed and the distribution remains constant with time

Answer 204

The energy is redistributed and the distribution changes with time

Answer 205

There is a gain of energy

Answer 206

There is a loss of energy

Answer 207

Longitudinal stationary

Answer 208

Transverse progressive

Answer 209

Transverse stationary

Answer 210

Longitudinal progressive

Answer 211

Sonic speed

Answer 212

None of these

Answer 213

Supersonic speed

Answer 214

Extra supersonic speed

Answer 215

Diffraction

Answer 216

Reflection

Answer 217

Polarization

Answer 218

Refraction

Answer 219

The elastic property as well as the inertia property

Answer 220

The elastic property but not on the inertia property

Answer 221

The inertia property but not on the elastic property

Answer 222

Neither the elastic property nor the inertia property

Answer 223

Become zero

Answer 224

Remains same

Answer 225

Interference

Answer 226

Polarization

Answer 227

Refraction

Answer 228

Reflection

Answer 229

Transverse

Answer 230

Electromagnetic

Answer 231

Longitudinal

Answer 232

Stationary

Answer 233

Energy, momentum and mass

Answer 234

Energy and linear momentum

Answer 235

Energy and mass

Answer 236

x-ray radiation capacity

Answer 237

Energy of radiation

Answer 238

Intensity of light

Answer 239

Sound loudness

Answer 240

Amplitude of motion will be very large

Answer 241

Amplitude of motion will be every small

Answer 242

None of these

Answer 243

Independent of amplitude of motion

Answer 244

√k₁/k₂

Answer 245

√k₂/k₁

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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