Physics Waves Online Mcqs Test

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Question 1

1. The gases have a

Answer

None of these

Answer

Zero elastic modulus

Answer

Smaller elastic modules

Answer

Large elastic modulus

Question 2

2. For production of beats the two sources must have

Answer

Different frequencies and same amplitude

Answer

Different frequencies

Answer

Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Question 3

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

Answer

Beats phenomena

Answer

All of these

Answer

Interference of waves

Answer

Doppler effect

Question 4

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

Answer

Sometimes in phase

Answer

Out of phase

Answer

None of these

Question 5

5. The Doppler effect is produced if

Answer

Both the above

Answer

The source is in motion

Answer

None of these

Answer

The detector is in motion

Question 6

6. In stationary waves

Answer

Energy is uniformly distributed

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

Question 7

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

Question 8

8. Doppler-effect applies to

Answer

Light wave only

Answer

Both sound and light waves

Answer

Sound wave only

Answer

Neither sound nor light wave

Question 9

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

Answer

Have a lower frequency

Answer

Cannot be diffracted

Answer

Do not affect photographic plate

Answer

Cannot be polarized

Question 10

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

Answer

Wavelength

Answer

None of these

Question 11

11. 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 12

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

Answer

Becomes zero

Answer

Remains unchanged

Question 13

13. In vibratory motion which parameter remains constant?

Answer

Total Energy

Answer

Angular Momentum

Answer

K.E. Energy

Answer

P.E. Energy

Question 14

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

Answer

Hyperbolic

Answer

Logarithmic

Answer

Exponential

Question 15

15. 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

An apparent decrease in wavelength

Answer

No apparent change in frequency

Question 16

16. Sound waves in air always

Answer

Electromagnetic

Answer

Transverse

Answer

Stationary

Answer

Longitudinal

Question 17

17. 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

Can penetrate the wall

Answer

Has a definite quality

Answer

Has a definite pitch

Answer

Has a definite capacity

Question 18

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

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Answer

Interference

Question 19

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

Question 20

20. Fidelity refers to

Answer

Reproduction of original image

Answer

Reproduction of music

Answer

Reproduction of original sound

Answer

Reproduction of a CD from original copy

Question 21

21. In stationary waves

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Question 22

22. 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 23

23. 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 24

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

Answer

Time period

Answer

Oscillation Time

Answer

Reverberation

Question 25

25. The velocity of sound is greatest in

Question 26

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

Question 27

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

Question 28

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

Answer

Increases or decreases depending on the material

Answer

Remains same

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. 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 increase

Answer

Time period will depend on the weight of the boy.

Answer

Time period will decrease

Answer

Time period will not change

Question 31

31. 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 maximum

Answer

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

Answer

When v is zero, α is zero

Answer

When v is maximum, α is zero

Question 32

32. The distance between node and anti-node is

Question 33

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

Answer

Displacement is maximum

Answer

Half way between them

Answer

Crossing mean position

Question 34

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

Answer

Frequency and velocity

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Question 35

35. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Mechanical waves

Answer

None of these

Answer

Periodic waves

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)

Answer

5 β – 4 α

Answer

5α – 4β

Question 37

37. Velocity of sound in vacuum is

Question 38

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

Answer

Wave length

Answer

Phase difference

Question 39

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

Answer

Damping force is small

Answer

Restoring force is small

Answer

Quality factor is small

Answer

Applied periodic force is small

Question 40

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

Answer

Amplitude of motion will be every small

Answer

Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be very large

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. Speed of sound in Water at 20°C is:

Answer

1567 ms¯¹

Answer

1483 ms¯¹

Answer

1343 ms¯¹

Answer

1214 ms¯¹

Question 43

43. Beats are the results of

Answer

Polarization

Answer

Constrictive and destructive interference

Answer

Destructive interference

Answer

Diffraction of sound waves

Question 44

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

Answer

Remains constant

Answer

Becomes Zero

Question 45

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

Answer

Maximum in the extreme position

Answer

None of these

Answer

Zero in the mean position

Question 46

46. 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 47

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

Answer

1/f seconds

Answer

1/T seconds

Question 48

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

Answer

4π second

Answer

2π second

Question 49

49. 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 velocity and displacement 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

Question 50

50. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Question 51

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

Question 52

52. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 53

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

Question 54

54. 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 55

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

Answer

Independent of x

Question 56

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

Answer

Oscillation

Answer

None of these

Question 57

57. 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 58

58. 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 59

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

Question 60

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

Answer

Ultra-violet rays

Answer

Gamma rays

Answer

Infra-red radiation

Answer

Visible light

Question 61

61. Decibel is unit of

Answer

Intensity of light

Answer

x-ray radiation capacity

Answer

Energy of radiation

Answer

Sound loudness

Question 62

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

Answer

Interference

Answer

Refraction

Answer

Polarization

Answer

Reflection

Question 63

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

Answer

Matter waves

Answer

Mechanical waves

Answer

Electromagnetic waves

Answer

Carrier waves

Question 64

64. 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

Answer 164

Wave mechanics

Answer 165

Water waves

Answer 166

All of these

Answer 167

Light waves

Answer 168

Sound waves

Answer 169

Rectilinear Motion

Answer 170

Simple Harmonic Motion

Answer 171

Circular Motion

Answer 172

Angular Motion

Answer 173

Both pressure and density

Answer 174

Pressure only

Answer 175

Density only

Answer 176

Neither pressure nor density

Answer 177

Longitudinal progressive

Answer 178

Longitudinal stationary

Answer 179

Transverse stationary

Answer 180

Transverse progressive

Answer 181

Beat phenomenon

Answer 182

Interference

Answer 183

Doppler effect

Answer 184

Moisture contents in air

Answer 185

Temperature of air

Answer 186

The atmospheric pressure

Answer 187

The composition of air

Answer 188

Polarization

Answer 189

Diffraction

Answer 190

Reflection

Answer 191

Refraction

Answer 192

They require material medium for propagation

Answer 193

They do not have enough energy

Answer 194

They are transverse waves

Answer 195

They are stationary waves

Answer 196

Quadruple the mass

Answer 197

Reduce the mass to one fourth

Answer 198

Half the mass

Answer 199

Double the mass

Answer 200

The elastic property as well as the inertia property

Answer 201

The elastic property but not on the inertia property

Answer 202

Neither the elastic property nor the inertia property

Answer 203

The inertia property but not on the elastic property

Answer 204

Same as that of the individual waves

Answer 205

Half that of the individual waves

Answer 206

Twice that of the individual waves

Answer 207

√2 that of the individual waves

Answer 208

√6 times faster

Answer 209

At correct rate

Answer 210

6 times faster

Answer 211

√6 times slower

Answer 212

143 Nm¯¹

Answer 213

300 Nm¯¹

Answer 214

700 Nm¯¹

Answer 215

100 Nm¯¹

Answer 216

None of these

Answer 217

Transverse wave

Answer 218

Longitudinal waves

Answer 219

Progressive wave

Answer 220

3,000 to 6,000 Hz

Answer 221

5,000 to 11,000 Hz

Answer 222

4,000 to 8,000 Hz

Answer 223

2,000 to 4,000 Hz

Answer 224

Increased rapidly

Answer 225

None of these

Answer 226

None of these

Answer 227

Stationary waves

Answer 228

Electromagnetic waves

Answer 229

Transverse progressive waves

Answer 230

Longitudinal vibration

Answer 231

Extra supersonic speed

Answer 232

Sonic speed

Answer 233

Supersonic speed

Answer 234

None of these

Answer 235

The energy is redistributed and the distribution changes with time

Answer 236

There is a loss of energy

Answer 237

There is a gain of energy

Answer 238

The energy is redistributed and the distribution remains constant with time

Answer 239

Remains same

Answer 240

Becomes one half

Answer 241

Become one fourth

Answer 242

Becomes double

Answer 243

Density and elasticity of gas

Answer 244

Wavelength of sound

Answer 245

Amplitude and frequency of sound

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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Important Waves Question and Answer

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Malik Tahir

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