Physics Waves Online Mcqs Test

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Question 1

1. 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 2

2. 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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Can penetrate the wall

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Has a definite capacity

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Has a definite pitch

Question 3

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

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Double the mass

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Quadruple the mass

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Half the mass

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Reduce the mass to one fourth

Question 4

4. 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 5

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

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Longitudinal progressive

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Transverse progressive

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Longitudinal stationary

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Transverse stationary

Question 6

6. The distance between node and antinode is

Question 7

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

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Independent of x

Question 8

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

Question 9

9. Sound waves in air always

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Transverse

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Electromagnetic

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Stationary

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Longitudinal

Question 10

10. The gases have a

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Large elastic modulus

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Zero elastic modulus

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None of these

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Smaller elastic modules

Question 11

11. In simple harmonic motion,

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

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

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

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

Question 12

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

Question 13

13. The velocity of sound in air depends upon

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Density and elasticity of gas

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Wavelength of sound

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Amplitude and frequency of sound

Question 14

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

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Diffraction

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Interference

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Refraction

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Polarization

Question 15

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

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Out of phase

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None of these

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Sometimes in phase

Question 16

16. An oscillating mass-spring system generates

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Periodic waves

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Mechanical waves

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None of these

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Progressive waves

Question 17

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

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Have a lower frequency

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Cannot be diffracted

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Cannot be polarized

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Do not affect photographic plate

Question 18

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

Question 19

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

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Simple Harmonic Motion

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Circular Motion

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Rectilinear Motion

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Angular Motion

Question 20

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

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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

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Half that of the individual waves

Question 21

21. 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 22

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

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Diffraction

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Refraction

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Polarization

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Reflection

Question 23

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

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Remains same

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Become one fourth

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Becomes one half

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Becomes double

Question 24

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

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A straight line

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A hyperbola

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An ellipse

Question 25

25. The speed of sound in a medium depends on

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Neither the elastic property nor the inertia property

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The inertia property but not on the elastic property

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The elastic property but not on the inertia property

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The elastic property as well as the inertia property

Question 26

26. 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 27

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

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Frequency and velocity

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Frequency and number of harmonic

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Intensity and frequency

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Intensity and velocity

Question 28

28. In vibratory motion which parameter remains constant?

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Total Energy

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Angular Momentum

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K.E. Energy

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P.E. Energy

Question 29

29. Velocity of sound in vacuum is

Question 30

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

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Independent of amplitude of motion

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Amplitude of motion will be very large

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None of these

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Amplitude of motion will be every small

Question 31

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

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Transverse wave

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None of these

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Progressive wave

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Longitudinal waves

Question 32

32. 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 33

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

Question 34

34. What sort of waves exhibit the Doppler effect?

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Light waves

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All of these

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Sound waves

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Water waves

Question 35

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

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Maximum in the extreme position

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Zero in the mean position

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None of these

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

9 (β – α)

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5 β – 4 α

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5α – 4β

Question 37

37. 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

300 Nm¯¹

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143 Nm¯¹

Answer

700 Nm¯¹

Question 38

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

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The composition of air

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Moisture contents in air

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The atmospheric pressure

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Temperature of air

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?

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When v is maximum, α is maximum

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

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When v is maximum, α is zero

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When v is zero, α is zero

Question 40

40. The Doppler effect is produced if

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Both the above

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None of these

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The detector is in motion

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The source is in motion

Question 41

41. Decibel is unit of

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Intensity of light

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Energy of radiation

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x-ray radiation capacity

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Sound loudness

Question 42

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

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Both pressure and density

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Neither pressure nor density

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Pressure only

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Density only

Question 43

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

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An apparent decrease in wavelength

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An apparent decrease in frequency

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An apparent increase in frequency

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No apparent change in frequency

Question 44

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

Question 45

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

Answer

Beats phenomena

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Interference of waves

Answer

All of these

Answer

Doppler effect

Question 46

46. 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 47

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

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Wave mechanics

Question 48

48. A system under going force vibrations is known as

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Vibration harmonic oscillator

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Frequency harmonic oscillator

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Driven harmonic oscillator

Question 49

49. In stationary waves

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Energy is minimum at nodes and maximum at antinodes

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Alternating maximum and minimum energy producing at nodes and antinodes

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Energy is uniformly distributed

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Energy is minimum at nodes and maximum at antidotes

Question 50

50. Waves transmit _________ from one place to another

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None of these

Question 51

51. Energy is not carried by

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Longitudinal vibration

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Transverse progressive waves

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Electromagnetic waves

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Stationary waves

Question 52

52. The velocity of sound is greatest in

Question 53

53. 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 54

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

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Oscillation Time

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Time period

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Reverberation

Question 55

55. 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?

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Time period will increase

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Time period will not change

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Time period will decrease

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Time period will depend on the weight of the boy.

Question 56

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

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Beat phenomenon

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Doppler effect

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Interference

Question 57

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

Question 58

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

Question 59

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

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Damping force is small

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Quality factor is small

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Applied periodic force is small

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Restoring force is small

Question 60

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

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Electromagnetic waves

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Matter waves

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Carrier waves

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Mechanical waves

Question 61

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

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None of these

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Increased rapidly

Question 62

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

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Oscillation

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None of these

Question 63

63. Fidelity refers to

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Reproduction of a CD from original copy

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Reproduction of original sound

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Reproduction of original image

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Reproduction of music

Question 64

64. 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

Answer 175

1567 ms¯¹

Answer 176

1483 ms¯¹

Answer 177

1343 ms¯¹

Answer 178

1214 ms¯¹

Answer 179

Energy is uniformly distributed

Answer 180

Energy is maximum at nodes and minimum at antidotes

Answer 181

Energy is minimum at nodes and maximum at antinodes

Answer 182

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 183

Visible light

Answer 184

Gamma rays

Answer 185

Infra-red radiation

Answer 186

Ultra-violet rays

Answer 187

√k₂/k₁

Answer 188

√k₁/k₂

Answer 189

Logarithmic

Answer 190

Hyperbolic

Answer 191

Exponential

Answer 192

Constructive interference

Answer 193

Destructive interference

Answer 194

Phase difference

Answer 195

Wave length

Answer 196

Energy and mass

Answer 197

Energy and linear momentum

Answer 198

Energy, momentum and mass

Answer 199

There is a gain of energy

Answer 200

There is a loss of energy

Answer 201

The energy is redistributed and the distribution changes with time

Answer 202

The energy is redistributed and the distribution remains constant with time

Answer 203

4,000 to 8,000 Hz

Answer 204

2,000 to 4,000 Hz

Answer 205

3,000 to 6,000 Hz

Answer 206

5,000 to 11,000 Hz

Answer 207

Wavelength

Answer 208

None of these

Answer 209

Becomes Zero

Answer 210

Remains constant

Answer 211

Interference

Answer 212

Polarization

Answer 213

Refraction

Answer 214

Reflection

Answer 215

k₁ k₂/( k₁+k₂)

Answer 216

(k₁+k₂)/2

Answer 217

√k₁k₂

Answer 218

2π second

Answer 219

4π second

Answer 220

Remains unchanged

Answer 221

Becomes zero

Answer 222

At correct rate

Answer 223

√6 times slower

Answer 224

6 times faster

Answer 225

√6 times faster

Answer 226

They are stationary waves

Answer 227

They do not have enough energy

Answer 228

They require material medium for propagation

Answer 229

They are transverse waves

Answer 230

1/f seconds

Answer 231

1/T seconds

Answer 232

Become zero

Answer 233

Remains same

Answer 234

Destructive interference

Answer 235

Constrictive and destructive interference

Answer 236

Polarization

Answer 237

Diffraction of sound waves

Answer 238

Supersonic speed

Answer 239

Sonic speed

Answer 240

None of these

Answer 241

Extra supersonic speed

Answer 242

Both sound and light waves

Answer 243

Neither sound nor light wave

Answer 244

Light wave only

Answer 245

Sound wave only

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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