Physics Waves Online Mcqs Test

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Question 1

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

Answer

Cannot be diffracted

Answer

Cannot be polarized

Answer

Do not affect photographic plate

Answer

Have a lower frequency

Question 2

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

Answer

Transverse stationary

Answer

Longitudinal stationary

Answer

Longitudinal progressive

Answer

Transverse progressive

Question 3

3. The velocity of sound is greatest in

Question 4

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

Answer

An apparent decrease in frequency

Answer

An apparent increase in frequency

Answer

No apparent change in frequency

Answer

An apparent decrease in wavelength

Question 5

5. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They are stationary waves

Answer

They require material medium for propagation

Answer

They are transverse waves

Question 6

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

Answer

Wavelength

Answer

None of these

Question 7

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

Question 8

8. Beats are the results of

Answer

Destructive interference

Answer

Constrictive and destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Question 9

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

Answer

1/f seconds

Answer

1/T seconds

Question 10

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

Answer

Doppler effect

Answer

Beat phenomenon

Answer

Interference

Question 11

11. Decibel is unit of

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Sound loudness

Answer

Intensity of light

Answer

x-ray radiation capacity

Answer

Energy of radiation

Question 12

12. Waves transmit _________ from one place to another

Answer

None of these

Question 13

13. An oscillating mass-spring system generates

Answer

Periodic waves

Answer

None of these

Answer

Progressive waves

Answer

Mechanical waves

Question 14

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

Answer

1483 ms¯¹

Answer

1214 ms¯¹

Answer

1343 ms¯¹

Answer

1567 ms¯¹

Question 15

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

Answer

5,000 to 11,000 Hz

Answer

4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Answer

2,000 to 4,000 Hz

Question 16

16. 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 faster

Answer

√6 times slower

Answer

At correct rate

Question 17

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

Answer

The composition of air

Answer

Temperature of air

Answer

The atmospheric pressure

Answer

Moisture contents in air

Question 18

18. The speed of sound in a medium depends on

Answer

The elastic property but not on the inertia property

Answer

The inertia property but not on the elastic property

Answer

Neither the elastic property nor the inertia property

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The elastic property as well as the inertia property

Question 19

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

Answer

Amplitude of motion will be every small

Answer

Amplitude of motion will be very large

Answer

Independent of amplitude of motion

Answer

None of these

Question 20

20. 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 21

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

Answer

Doppler effect

Answer

Beats phenomena

Answer

Interference of waves

Answer

All of these

Question 22

22. A spring-mass system oscillates with a frequency v, if it is taken in an elevator slowly accelerating upward, the frequency will

Answer

Become zero

Answer

Remains same

Question 23

23. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

K.E. Energy

Answer

P.E. Energy

Answer

Total Energy

Question 24

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 25

25. Sound waves in air always

Answer

Electromagnetic

Answer

Transverse

Answer

Longitudinal

Answer

Stationary

Question 26

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

Answer

4π second

Answer

2π second

Question 27

27. 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

9 (β – α)

Answer

5α – 4β

Question 28

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

Answer

Refraction

Answer

Polarization

Answer

Diffraction

Answer

Reflection

Question 29

29. 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 30

30. For production of beats the two sources must have

Answer

Different frequencies and same amplitude

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same phase

Answer

Different frequencies

Question 31

31. 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

300 Nm¯¹

Answer

143 Nm¯¹

Answer

100 Nm¯¹

Answer

700 Nm¯¹

Question 32

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

Answer

Twice that of the individual waves

Answer

Half that of the individual waves

Answer

√2 that of the individual waves

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Same as that of the individual waves

Question 33

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

Answer

Becomes Zero

Answer

Remains constant

Question 34

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

Answer

Becomes zero

Answer

Remains unchanged

Question 35

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

Question 36

36. 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 37

37. The gases have a

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Answer

None of these

Question 38

38. Fidelity refers to

Answer

Reproduction of original sound

Answer

Reproduction of original image

Answer

Reproduction of music

Answer

Reproduction of a CD from original copy

Question 39

39. 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 40

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

Answer

None of these

Answer

Out of phase

Answer

Sometimes in phase

Question 41

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

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Answer

Half the mass

Answer

Double the mass

Question 42

42. 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 maximum

Answer

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

Answer

When v is maximum, α is zero

Question 43

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

Answer

Independent of x

Question 44

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

Answer

Zero in the mean position

Answer

None of these

Answer

Maximum in the extreme position

Question 45

45. The distance between node and anti-node is

Question 46

46. 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 47

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

Answer

Electromagnetic waves

Answer

Carrier waves

Answer

Matter waves

Answer

Mechanical waves

Question 48

48. The Doppler effect is produced if

Answer

None of these

Answer

The source is in motion

Answer

Both the above

Answer

The detector is in motion

Question 49

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

Question 50

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

Question 51

51. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Water waves

Answer

Light waves

Answer

Sound waves

Question 52

52. Doppler-effect applies to

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Both sound and light waves

Answer

Sound wave only

Question 53

53. In simple harmonic motion,

Answer

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

Answer

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

Answer

The velocity and acceleration 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

Question 54

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

Question 55

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

Answer

None of these

Answer

Oscillation

Question 56

56. In stationary waves

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Energy is minimum at nodes and maximum at antidotes

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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

Answer

Energy is uniformly distributed

Question 57

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

Answer

There is a gain of energy

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The energy is redistributed and the distribution changes with time

Answer

There is a loss of energy

Answer

The energy is redistributed and the distribution remains constant with time

Question 58

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

Answer

Crossing mean position

Answer

Half way between them

Answer

Displacement is maximum

Question 59

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

Question 60

60. The velocity of sound in air depends upon

Answer

Amplitude and frequency of sound

Answer

Density and elasticity of gas

Answer

Wavelength of sound

Question 61

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

Answer

Infra-red radiation

Answer

Gamma rays

Answer

Visible light

Answer

Ultra-violet rays

Question 62

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

Answer

Reverberation

Answer

Oscillation Time

Answer

Time period

Question 63

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

Answer

Becomes one half

Answer

Become one fourth

Answer

Becomes double

Answer

Remains same

Question 64

64. A sound source is moving towards stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is

Answer 181

Damping force is small

Answer 182

Applied periodic force is small

Answer 183

Quality factor is small

Answer 184

Restoring force is small

Answer 185

Increased rapidly

Answer 186

None of these

Answer 187

Destructive interference

Answer 188

Constructive interference

Answer 189

Intensity and frequency

Answer 190

Frequency and velocity

Answer 191

Frequency and number of harmonic

Answer 192

Intensity and velocity

Answer 193

Pressure only

Answer 194

Density only

Answer 195

Neither pressure nor density

Answer 196

Both pressure and density

Answer 197

Hyperbolic

Answer 198

Logarithmic

Answer 199

Exponential

Answer 200

Energy, momentum and mass

Answer 201

Energy and mass

Answer 202

Energy and linear momentum

Answer 203

Wave mechanics

Answer 204

Rectilinear Motion

Answer 205

Angular Motion

Answer 206

Circular Motion

Answer 207

Simple Harmonic Motion

Answer 208

Energy is minimum at nodes and maximum at antinodes

Answer 209

Energy is uniformly distributed

Answer 210

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 211

Energy is maximum at nodes and minimum at antidotes

Answer 212

Transverse wave

Answer 213

Longitudinal waves

Answer 214

Progressive wave

Answer 215

None of these

Answer 216

Interference

Answer 217

Refraction

Answer 218

Polarization

Answer 219

Diffraction

Answer 220

Time period will not change

Answer 221

Time period will decrease

Answer 222

Time period will increase

Answer 223

Time period will depend on the weight of the boy.

Answer 224

A hyperbola

Answer 225

An ellipse

Answer 226

A straight line

Answer 227

Vibration harmonic oscillator

Answer 228

Driven harmonic oscillator

Answer 229

Frequency harmonic oscillator

Answer 230

Longitudinal vibration

Answer 231

Stationary waves

Answer 232

Electromagnetic waves

Answer 233

Transverse progressive waves

Answer 234

Reflection

Answer 235

Interference

Answer 236

Refraction

Answer 237

Polarization

Answer 238

Sonic speed

Answer 239

None of these

Answer 240

Supersonic speed

Answer 241

Extra supersonic speed

Answer 242

Phase difference

Answer 243

Wave length

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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