Physics Waves Online Mcqs Test

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Question 1

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

Answer

Crossing mean position

Answer

Displacement is maximum

Answer

Half way between them

Question 2

2. The distance between node and antinode is

Question 3

3. For production of beats the two sources must have

Answer

Different frequencies and same phase

Answer

Different frequencies

Answer

Different frequencies and same amplitude

Answer

Different frequencies, same amplitude and same phase

Question 4

4. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

Periodic waves

Answer

None of these

Answer

Progressive waves

Question 5

5. 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

5α – 4β

Answer

9 (β – α)

Question 6

6. 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 7

7. 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 slower

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6 times faster

Answer

At correct rate

Question 8

8. What sort of waves exhibit the Doppler effect?

Answer

Water waves

Answer

All of these

Answer

Sound waves

Answer

Light waves

Question 9

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

Answer

None of these

Answer

Increased rapidly

Question 10

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

Question 11

11. 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 12

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

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Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be very large

Answer

Amplitude of motion will be every small

Question 13

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

Answer

Reduce the mass to one fourth

Answer

Quadruple the mass

Answer

Half the mass

Answer

Double the mass

Question 14

14. In stationary waves

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Energy is minimum at nodes and maximum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Question 15

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

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Longitudinal progressive

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Transverse stationary

Answer

Transverse progressive

Answer

Longitudinal stationary

Question 16

16. Velocity of sound in vacuum is

Question 17

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

Answer

Do not affect photographic plate

Answer

Cannot be polarized

Answer

Have a lower frequency

Answer

Cannot be diffracted

Question 18

18. 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 19

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

Answer

Hyperbolic

Answer

Exponential

Answer

Logarithmic

Question 20

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

Answer

Progressive wave

Answer

None of these

Answer

Transverse wave

Answer

Longitudinal waves

Question 21

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

Answer

Reverberation

Answer

Oscillation Time

Answer

Time period

Question 22

22. 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 and linear momentum

Answer

Energy, momentum and mass

Question 23

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

Question 24

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

Question 25

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

Question 26

26. 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 27

27. 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

When v is zero, α is zero

Answer

When v is maximum, α is zero

Answer

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

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 total energy of a particle, executing simple harmonic moron is

Answer

Independent of x

Question 30

30. 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 31

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

Answer

4π second

Answer

2π second

Question 32

32. The velocity of sound is greatest in

Question 33

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

Answer

Beats phenomena

Answer

All of these

Answer

Doppler effect

Answer

Interference of waves

Question 34

34. The speed of sound in a medium depends on

Answer

Neither the elastic property nor the inertia property

Answer

The inertia property but not on the elastic property

Answer

The elastic property as well as the inertia property

Answer

The elastic property but not on the inertia property

Question 35

35. In vibratory motion which parameter remains constant?

Answer

P.E. Energy

Answer

K.E. Energy

Answer

Total Energy

Answer

Angular Momentum

Question 36

36. In simple harmonic motion,

Answer

The velocity and displacement 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

Answer

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

Answer

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

Question 37

37. 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 38

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

Answer

Remains constant

Answer

Becomes Zero

Question 39

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

Answer

Ultra-violet rays

Answer

Infra-red radiation

Answer

Visible light

Answer

Gamma rays

Question 40

40. Sound waves in air always

Answer

Stationary

Answer

Transverse

Answer

Longitudinal

Answer

Electromagnetic

Question 41

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

Answer

Restoring force is small

Answer

Applied periodic force is small

Answer

Damping force is small

Answer

Quality factor is small

Question 42

42. The velocity of sound in air depends upon

Answer

Density and elasticity of gas

Answer

Amplitude and frequency of sound

Answer

Wavelength of sound

Question 43

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

Question 44

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

Answer

1/T seconds

Answer

1/f seconds

Question 45

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

Answer

None of these

Answer

Wavelength

Question 46

46. 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

(k₁+k₂)/2

Answer

√k₁k₂

Question 47

47. 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 48

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

Answer

Interference

Answer

Refraction

Answer

Reflection

Answer

Polarization

Question 49

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

Answer

Wave length

Answer

Phase difference

Question 50

50. 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 not change

Answer

Time period will depend on the weight of the boy.

Answer

Time period will increase

Answer

Time period will decrease

Question 51

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

Answer

5,000 to 11,000 Hz

Answer

3,000 to 6,000 Hz

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Question 52

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

Answer

A hyperbola

Answer

A straight line

Answer

An ellipse

Question 53

53. A system under going force vibrations is known as

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Driven harmonic oscillator

Question 54

54. Decibel is unit of

Answer

Energy of radiation

Answer

Intensity of light

Answer

Sound loudness

Answer

x-ray radiation capacity

Question 55

55. Energy is not carried by

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Answer

Stationary waves

Answer

Transverse progressive waves

Question 56

56. 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 57

57. 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 58

58. 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 59

59. 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

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Question 60

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

Answer

Wave mechanics

Question 61

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

Question 62

62. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Diffraction of sound waves

Answer

Destructive interference

Answer

Polarization

Question 63

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

Answer

Doppler effect

Answer

Interference

Answer

Beat phenomenon

Question 64

64. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Answer 168

Extra supersonic speed

Answer 169

None of these

Answer 170

Sonic speed

Answer 171

Supersonic speed

Answer 172

Density only

Answer 173

Pressure only

Answer 174

Both pressure and density

Answer 175

Neither pressure nor density

Answer 176

Oscillation

Answer 177

None of these

Answer 178

None of these

Answer 179

Sometimes in phase

Answer 180

Out of phase

Answer 181

Reproduction of music

Answer 182

Reproduction of a CD from original copy

Answer 183

Reproduction of original sound

Answer 184

Reproduction of original image

Answer 185

1483 ms¯¹

Answer 186

1567 ms¯¹

Answer 187

1343 ms¯¹

Answer 188

1214 ms¯¹

Answer 189

Has a definite capacity

Answer 190

Has a definite quality

Answer 191

Has a definite pitch

Answer 192

Can penetrate the wall

Answer 193

They are transverse waves

Answer 194

They do not have enough energy

Answer 195

They are stationary waves

Answer 196

They require material medium for propagation

Answer 197

Frequency and number of harmonic

Answer 198

Intensity and velocity

Answer 199

Frequency and velocity

Answer 200

Intensity and frequency

Answer 201

An apparent decrease in frequency

Answer 202

An apparent increase in frequency

Answer 203

An apparent decrease in wavelength

Answer 204

No apparent change in frequency

Answer 205

Electromagnetic waves

Answer 206

Matter waves

Answer 207

Mechanical waves

Answer 208

Carrier waves

Answer 209

Energy is maximum at nodes and minimum at antidotes

Answer 210

Energy is minimum at nodes and maximum at antinodes

Answer 211

Energy is uniformly distributed

Answer 212

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 213

Becomes zero

Answer 214

Remains unchanged

Answer 215

Refraction

Answer 216

Polarization

Answer 217

Interference

Answer 218

Diffraction

Answer 219

Circular Motion

Answer 220

Angular Motion

Answer 221

Simple Harmonic Motion

Answer 222

Rectilinear Motion

Answer 223

None of these

Answer 224

Same as that of the individual waves

Answer 225

Twice that of the individual waves

Answer 226

√2 that of the individual waves

Answer 227

Half that of the individual waves

Answer 228

Reflection

Answer 229

Diffraction

Answer 230

Refraction

Answer 231

Polarization

Answer 232

Remains same

Answer 233

Becomes double

Answer 234

Becomes one half

Answer 235

Become one fourth

Answer 236

Light wave only

Answer 237

Neither sound nor light wave

Answer 238

Both sound and light waves

Answer 239

Sound wave only

Answer 240

√k₁/k₂

Answer 241

√k₂/k₁

Answer 242

Large elastic modulus

Answer 243

None of these

Answer 244

Smaller elastic modules

Answer 245

Zero elastic modulus

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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