Physics Waves Online Mcqs Test

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Question 1

1. 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 2

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

Answer

Progressive wave

Answer

Longitudinal waves

Answer

None of these

Answer

Transverse wave

Question 3

3. The Doppler effect is produced if

Answer

None of these

Answer

The detector is in motion

Answer

The source is in motion

Answer

Both the above

Question 4

4. 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 5

5. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

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

Question 6

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

Answer

Circular Motion

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Answer

Angular Motion

Question 7

7. Velocity of sound in vacuum is

Question 8

8. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

Periodic waves

Answer

None of these

Answer

Progressive waves

Question 9

9. The gases have a

Answer

Large elastic modulus

Answer

None of these

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Question 10

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

Question 11

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

Answer

4π second

Answer

2π second

Question 12

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

Answer

Supersonic speed

Answer

Sonic speed

Answer

Extra supersonic speed

Answer

None of these

Question 13

13. Waves transmit _________ from one place to another

Answer

None of these

Question 14

14. 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

√k₁/k₂

Answer

√k₂/k₁

Question 15

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

Answer

Energy, momentum and mass

Answer

Energy and mass

Answer

Energy and linear momentum

Question 16

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

Answer

Becomes one half

Answer

Becomes double

Answer

Become one fourth

Answer

Remains same

Question 17

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

Question 18

18. Beats are the results of

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Answer

Polarization

Answer

Destructive interference

Question 19

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

Answer

Wavelength

Answer

None of these

Question 20

20. 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 21

21. The distance between node and anti-node is

Question 22

22. In simple harmonic motion,

Answer

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

Answer

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

Question 23

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

Question 24

24. 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 maximum, α is zero

Answer

When v is zero, α is zero

Question 25

25. 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

Has a definite pitch

Answer

Can penetrate the wall

Answer

Has a definite quality

Question 26

26. 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/( k₁+k₂)

Answer

(k₁+k₂)/2

Question 27

27. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 28

28. The speed of sound in a medium depends on

Answer

The inertia property but not on the elastic property

Answer

Neither the elastic property nor the inertia property

Answer

The elastic property as well as the inertia property

Answer

The elastic property but not on the inertia property

Question 29

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

Question 30

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

Answer

Visible light

Answer

Ultra-violet rays

Answer

Infra-red radiation

Answer

Gamma rays

Question 31

31. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Water waves

Answer

Light waves

Answer

Sound waves

Question 32

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

Answer

Neither pressure nor density

Answer

Density only

Answer

Both pressure and density

Answer

Pressure only

Question 33

33. 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 34

34. Sound waves in air always

Answer

Electromagnetic

Answer

Stationary

Answer

Transverse

Answer

Longitudinal

Question 35

35. Sound waves do not travel in vacuum because

Answer

They are stationary waves

Answer

They require material medium for propagation

Answer

They are transverse waves

Answer

They do not have enough energy

Question 36

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

Answer

Beats phenomena

Answer

Interference of waves

Answer

Doppler effect

Answer

All of these

Question 37

37. Doppler-effect applies to

Answer

Both sound and light waves

Answer

Sound wave only

Answer

Light wave only

Answer

Neither sound nor light wave

Question 38

38. 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 39

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

Question 40

40. 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 41

41. 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 42

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

Answer

Doppler effect

Answer

Interference

Answer

Beat phenomenon

Question 43

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

Answer

The energy is redistributed and the distribution remains constant with time

Answer

There is a gain of energy

Answer

The energy is redistributed and the distribution changes with time

Answer

There is a loss of energy

Question 44

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

Question 45

45. 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 46

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

Answer

Oscillation Time

Answer

Reverberation

Answer

Time period

Question 47

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

Answer

Quality factor is small

Answer

Damping force is small

Answer

Restoring force is small

Answer

Applied periodic force is small

Question 48

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

Answer

Cannot be diffracted

Answer

Do not affect photographic plate

Answer

Have a lower frequency

Answer

Cannot be polarized

Question 49

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

Answer

Independent of x

Question 50

50. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

Angular Momentum

Answer

P.E. Energy

Answer

Total Energy

Question 51

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

Question 52

52. Energy is not carried by

Answer

Electromagnetic waves

Answer

Stationary waves

Answer

Longitudinal vibration

Answer

Transverse progressive waves

Question 53

53. Fidelity refers to

Answer

Reproduction of original sound

Answer

Reproduction of original image

Answer

Reproduction of a CD from original copy

Answer

Reproduction of music

Question 54

54. 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 decrease

Answer

Time period will not change

Answer

Time period will depend on the weight of the boy.

Answer

Time period will increase

Question 55

55. The velocity of sound is greatest in

Question 56

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

Answer

Electromagnetic waves

Answer

Matter waves

Answer

Mechanical waves

Answer

Carrier waves

Question 57

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

Question 58

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

Question 59

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

Answer

Hyperbolic

Answer

Logarithmic

Answer

Exponential

Question 60

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

Answer

Refraction

Answer

Diffraction

Answer

Reflection

Answer

Polarization

Question 61

61. 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 62

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

Answer

1/f seconds

Answer

1/T seconds

Question 63

63. 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 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 166

Remains same

Answer 167

Become zero

Answer 168

Maximum in the extreme position

Answer 169

Zero in the mean position

Answer 170

None of these

Answer 171

Phase difference

Answer 172

Wave length

Answer 173

Transverse stationary

Answer 174

Longitudinal progressive

Answer 175

Longitudinal stationary

Answer 176

Transverse progressive

Answer 177

Polarization

Answer 178

Interference

Answer 179

Reflection

Answer 180

Refraction

Answer 181

Wave mechanics

Answer 182

Becomes Zero

Answer 183

Remains constant

Answer 184

Sound loudness

Answer 185

x-ray radiation capacity

Answer 186

Intensity of light

Answer 187

Energy of radiation

Answer 188

Energy is minimum at nodes and maximum at antidotes

Answer 189

Energy is uniformly distributed

Answer 190

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 191

Energy is minimum at nodes and maximum at antinodes

Answer 192

Half that of the individual waves

Answer 193

√2 that of the individual waves

Answer 194

Same as that of the individual waves

Answer 195

Twice that of the individual waves

Answer 196

Remains unchanged

Answer 197

Becomes zero

Answer 198

143 Nm¯¹

Answer 199

300 Nm¯¹

Answer 200

100 Nm¯¹

Answer 201

700 Nm¯¹

Answer 202

Remains same

Answer 203

Increases or decreases depending on the material

Answer 204

Moisture contents in air

Answer 205

The composition of air

Answer 206

The atmospheric pressure

Answer 207

Temperature of air

Answer 208

An ellipse

Answer 209

A hyperbola

Answer 210

A straight line

Answer 211

Different frequencies and same amplitude

Answer 212

Different frequencies and same phase

Answer 213

Different frequencies, same amplitude and same phase

Answer 214

Different frequencies

Answer 215

None of these

Answer 216

Increased rapidly

Answer 217

6 times faster

Answer 218

√6 times faster

Answer 219

√6 times slower

Answer 220

At correct rate

Answer 221

Vibration harmonic oscillator

Answer 222

Driven harmonic oscillator

Answer 223

Frequency harmonic oscillator

Answer 224

An apparent increase in frequency

Answer 225

No apparent change in frequency

Answer 226

An apparent decrease in wavelength

Answer 227

An apparent decrease in frequency

Answer 228

None of these

Answer 229

Oscillation

Answer 230

Double the mass

Answer 231

Quadruple the mass

Answer 232

Half the mass

Answer 233

Reduce the mass to one fourth

Answer 234

Polarization

Answer 235

Diffraction

Answer 236

Interference

Answer 237

Refraction

Answer 238

Frequency and number of harmonic

Answer 239

Frequency and velocity

Answer 240

Intensity and frequency

Answer 241

Intensity and velocity

Answer 242

Amplitude of motion will be very large

Answer 243

None of these

Answer 244

Amplitude of motion will be every small

Answer 245

Independent of amplitude of motion

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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