Physics Waves Online Mcqs Test

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Question 1

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

Answer

Refraction

Answer

Reflection

Answer

Polarization

Answer

Interference

Question 2

2. Waves transmit _________ from one place to another

Answer

None of these

Question 3

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

Answer

Phase difference

Answer

Wave length

Question 4

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

Answer

Independent of x

Question 5

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

Answer

An apparent increase in frequency

Answer

An apparent decrease in frequency

Answer

No apparent change in frequency

Answer

An apparent decrease in wavelength

Question 6

6. 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

Remain unaffected

Answer

Become infinite

Question 7

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

Answer

1/T seconds

Answer

1/f seconds

Question 8

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

Answer

Time period

Answer

Reverberation

Answer

Oscillation Time

Question 9

9. 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

9 (β – α)

Answer

5 β – 4 α

Question 10

10. 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 quality

Answer

Has a definite pitch

Answer

Can penetrate the wall

Answer

Has a definite capacity

Question 11

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

Answer

Out of phase

Answer

None of these

Answer

Sometimes in phase

Question 12

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

Answer

There is a gain of energy

Answer

The energy is redistributed and the distribution remains constant with time

Answer

The energy is redistributed and the distribution changes with time

Answer

There is a loss of energy

Question 13

13. For production of beats the two sources must have

Answer

Different frequencies

Answer

Different frequencies and same amplitude

Answer

Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Question 14

14. 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 15

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

Answer

Matter waves

Answer

Carrier waves

Answer

Electromagnetic waves

Answer

Mechanical waves

Question 16

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

Answer

Remains same

Answer

Become zero

Question 17

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

Answer

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Answer

2,000 to 4,000 Hz

Answer

3,000 to 6,000 Hz

Question 18

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

Question 19

19. 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 20

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

Question 21

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

Answer

Beat phenomenon

Answer

Doppler effect

Answer

Interference

Question 22

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

Answer

Cannot be polarized

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Do not affect photographic plate

Question 23

23. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 24

24. The speed of sound in a medium depends on

Answer

Neither the elastic property nor the inertia property

Answer

The elastic property but not on the inertia property

Answer

The elastic property as well as the inertia property

Answer

The inertia property but not on the elastic property

Question 25

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

Answer

Half way between them

Answer

Displacement is maximum

Answer

Crossing mean position

Question 26

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

Answer

2π second

Answer

4π second

Question 27

27. 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

Longitudinal waves

Answer

Progressive wave

Answer

Transverse wave

Question 28

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

Question 29

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

Answer

A straight line

Answer

A hyperbola

Answer

An ellipse

Question 30

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

Answer

Neither pressure nor density

Answer

Both pressure and density

Answer

Density only

Answer

Pressure only

Question 31

31. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Question 32

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

Answer

None of these

Answer

Wavelength

Question 33

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

Question 34

34. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 35

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

Answer

All of these

Answer

Interference of waves

Answer

Doppler effect

Answer

Beats phenomena

Question 36

36. Velocity of sound in vacuum is

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

300 Nm¯¹

Answer

100 Nm¯¹

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Question 38

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

Question 39

39. In simple harmonic motion,

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

Answer

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

Question 40

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

Answer

None of these

Answer

Oscillation

Question 41

41. Doppler-effect applies to

Answer

Neither sound nor light wave

Answer

Both sound and light waves

Answer

Light wave only

Answer

Sound wave only

Question 42

42. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 43

43. Sound waves in air always

Answer

Longitudinal

Answer

Stationary

Answer

Electromagnetic

Answer

Transverse

Question 44

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

Answer

Energy and linear momentum

Answer

Energy, momentum and mass

Answer

Energy and mass

Question 45

45. Decibel is unit of

Answer

Intensity of light

Answer

Sound loudness

Answer

x-ray radiation capacity

Answer

Energy of radiation

Question 46

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

Answer

None of these

Answer

Increased rapidly

Question 47

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

Answer

Restoring force is small

Answer

Damping force is small

Answer

Applied periodic force is small

Answer

Quality factor is small

Question 48

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

Answer

Visible light

Answer

Infra-red radiation

Answer

Ultra-violet rays

Answer

Gamma rays

Question 49

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

Question 50

50. 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 zero

Answer

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

Answer

When v is maximum, α is maximum

Answer

When v is zero, α is zero

Question 51

51. 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 52

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

Answer

Remains unchanged

Answer

Becomes zero

Question 53

53. 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 54

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

Answer

Interference

Answer

Refraction

Answer

Diffraction

Answer

Polarization

Question 55

55. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

P.E. Energy

Answer

Total Energy

Answer

Angular Momentum

Question 56

56. 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 57

57. 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 58

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

Question 59

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

Question 60

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

Answer

Transverse progressive

Answer

Longitudinal progressive

Answer

Transverse stationary

Answer

Longitudinal stationary

Question 61

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

Answer

√k₁k₂

Answer

(k₁+k₂)/2

Answer

k₁ k₂/( k₁+k₂)

Question 62

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

Answer

Angular Motion

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Answer

Circular Motion

Question 63

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 64

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

Answer

Extra supersonic speed

Answer

Sonic speed

Answer

None of these

Answer

Supersonic speed

Answer 169

Intensity and velocity

Answer 170

Frequency and number of harmonic

Answer 171

Intensity and frequency

Answer 172

Frequency and velocity

Answer 173

The atmospheric pressure

Answer 174

Moisture contents in air

Answer 175

Temperature of air

Answer 176

The composition of air

Answer 177

The source is in motion

Answer 178

Both the above

Answer 179

None of these

Answer 180

The detector is in motion

Answer 181

Diffraction of sound waves

Answer 182

Destructive interference

Answer 183

Polarization

Answer 184

Constrictive and destructive interference

Answer 185

None of these

Answer 186

Smaller elastic modules

Answer 187

Zero elastic modulus

Answer 188

Large elastic modulus

Answer 189

Wave mechanics

Answer 190

Reproduction of a CD from original copy

Answer 191

Reproduction of original image

Answer 192

Reproduction of original sound

Answer 193

Reproduction of music

Answer 194

Half that of the individual waves

Answer 195

√2 that of the individual waves

Answer 196

Same as that of the individual waves

Answer 197

Twice that of the individual waves

Answer 198

Half the mass

Answer 199

Quadruple the mass

Answer 200

Reduce the mass to one fourth

Answer 201

Double the mass

Answer 202

Time period will depend on the weight of the boy.

Answer 203

Time period will not change

Answer 204

Time period will increase

Answer 205

Time period will decrease

Answer 206

√6 times faster

Answer 207

At correct rate

Answer 208

√6 times slower

Answer 209

6 times faster

Answer 210

Progressive waves

Answer 211

None of these

Answer 212

Periodic waves

Answer 213

Mechanical waves

Answer 214

Remains constant

Answer 215

Becomes Zero

Answer 216

Zero in the mean position

Answer 217

Maximum in the extreme position

Answer 218

None of these

Answer 219

Exponential

Answer 220

Hyperbolic

Answer 221

Logarithmic

Answer 222

Stationary waves

Answer 223

Electromagnetic waves

Answer 224

Transverse progressive waves

Answer 225

Longitudinal vibration

Answer 226

Polarization

Answer 227

Refraction

Answer 228

Reflection

Answer 229

Diffraction

Answer 230

Amplitude of motion will be very large

Answer 231

None of these

Answer 232

Independent of amplitude of motion

Answer 233

Amplitude of motion will be every small

Answer 234

Becomes one half

Answer 235

Becomes double

Answer 236

Become one fourth

Answer 237

Remains same

Answer 238

1483 ms¯¹

Answer 239

1343 ms¯¹

Answer 240

1567 ms¯¹

Answer 241

1214 ms¯¹

Answer 242

Sound waves

Answer 243

Light waves

Answer 244

Water waves

Answer 245

All of these

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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Key Preparation Tips:

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Malik Tahir

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