Physics Waves Online Mcqs Test

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Question 1

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

Answer

Wavelength

Answer

None of these

Question 2

2. Velocity of sound in vacuum is

Question 3

3. 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 pitch

Answer

Has a definite capacity

Answer

Can penetrate the wall

Answer

Has a definite quality

Question 4

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

Question 5

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

Answer

Moisture contents in air

Answer

The composition of air

Answer

Temperature of air

Answer

The atmospheric pressure

Question 6

6. 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 7

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

Answer

Polarization

Answer

Reflection

Answer

Interference

Answer

Refraction

Question 8

8. Sound waves in air always

Answer

Stationary

Answer

Electromagnetic

Answer

Transverse

Answer

Longitudinal

Question 9

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

Answer

Remains constant

Answer

Becomes Zero

Question 10

10. For production of beats the two sources must have

Answer

Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies

Answer

Different frequencies and same amplitude

Question 11

11. The velocity of sound is greatest in

Question 12

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

Question 13

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

Answer

1483 ms¯¹

Answer

1214 ms¯¹

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Question 14

14. 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 15

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

Question 16

16. An oscillating mass-spring system generates

Answer

None of these

Answer

Periodic waves

Answer

Mechanical waves

Answer

Progressive waves

Question 17

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

Answer

Diffraction

Answer

Polarization

Answer

Refraction

Answer

Interference

Question 18

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

Answer

Maximum in the extreme position

Answer

Zero in the mean position

Answer

None of these

Question 19

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

Answer

Quality factor is small

Answer

Applied periodic force is small

Answer

Restoring force is small

Answer

Damping force is small

Question 20

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

Answer

Double the mass

Answer

Reduce the mass to one fourth

Answer

Quadruple the mass

Answer

Half the mass

Question 21

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

Answer

Half that of the individual waves

Answer

√2 that of the individual waves

Answer

Twice that of the individual waves

Answer

Same as that of the individual waves

Question 22

22. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 23

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

Answer

Progressive wave

Answer

Transverse wave

Answer

Longitudinal waves

Answer

None of these

Question 24

24. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Polarization

Answer

Diffraction of sound waves

Answer

Destructive interference

Question 25

25. 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 26

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

Question 27

27. 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 28

28. Doppler-effect applies to

Answer

Both sound and light waves

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Sound wave only

Question 29

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

Answer

Simple Harmonic Motion

Answer

Angular Motion

Answer

Circular Motion

Answer

Rectilinear Motion

Question 30

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

Answer

Becomes zero

Answer

Remains unchanged

Question 31

31. 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 32

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

Answer

Neither pressure nor density

Answer

Pressure only

Answer

Both pressure and density

Answer

Density only

Question 33

33. 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 34

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

Answer

Independent of x

Question 35

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

Answer

Interference of waves

Answer

Doppler effect

Answer

All of these

Answer

Beats phenomena

Question 36

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

Answer

4π second

Answer

2π second

Question 37

37. The distance between node and anti-node is

Question 38

38. 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 39

39. 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 40

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

Answer

Longitudinal progressive

Answer

Transverse progressive

Answer

Longitudinal stationary

Answer

Transverse stationary

Question 41

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

Question 42

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

Answer

None of these

Answer

Oscillation

Question 43

43. Waves transmit _________ from one place to another

Answer

None of these

Question 44

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

Question 45

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

Answer

Time period

Answer

Reverberation

Answer

Oscillation Time

Question 46

46. What sort of waves exhibit the Doppler effect?

Answer

Light waves

Answer

Water waves

Answer

Sound waves

Answer

All of these

Question 47

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

Answer

A hyperbola

Answer

An ellipse

Answer

A straight line

Question 48

48. 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 49

49. 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

At correct rate

Answer

√6 times slower

Question 50

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

Answer

Ultra-violet rays

Answer

Visible light

Answer

Infra-red radiation

Answer

Gamma rays

Question 51

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

Question 52

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

Answer

Wave mechanics

Question 53

53. 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 54

54. Energy is not carried by

Answer

Longitudinal vibration

Answer

Stationary waves

Answer

Electromagnetic waves

Answer

Transverse progressive waves

Question 55

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

Question 56

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

Answer

None of these

Answer

Supersonic speed

Answer

Extra supersonic speed

Answer

Sonic speed

Question 57

57. 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 58

58. 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 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

Question 59

59. 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 60

60. The gases have a

Answer

Zero elastic modulus

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

None of these

Question 61

61. 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 62

62. The distance between node and antinode is

Question 63

63. 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 64

64. The speed of sound in a medium depends on

Answer

The inertia property but not on the elastic property

Answer

The elastic property but not on the inertia property

Answer

The elastic property as well as the inertia property

Answer

Neither the elastic property nor the inertia property

Answer 161

Becomes one half

Answer 162

Remains same

Answer 163

Becomes double

Answer 164

Become one fourth

Answer 165

Frequency harmonic oscillator

Answer 166

Driven harmonic oscillator

Answer 167

Vibration harmonic oscillator

Answer 168

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

Answer 169

When v is zero, α is zero

Answer 170

When v is maximum, α is zero

Answer 171

When v is maximum, α is maximum

Answer 172

Exponential

Answer 173

Hyperbolic

Answer 174

Logarithmic

Answer 175

Amplitude of motion will be every small

Answer 176

None of these

Answer 177

Amplitude of motion will be very large

Answer 178

Independent of amplitude of motion

Answer 179

Energy is minimum at nodes and maximum at antinodes

Answer 180

Energy is maximum at nodes and minimum at antidotes

Answer 181

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 182

Energy is uniformly distributed

Answer 183

Reflection

Answer 184

Diffraction

Answer 185

Refraction

Answer 186

Polarization

Answer 187

300 Nm¯¹

Answer 188

143 Nm¯¹

Answer 189

700 Nm¯¹

Answer 190

100 Nm¯¹

Answer 191

Wavelength of sound

Answer 192

Amplitude and frequency of sound

Answer 193

Density and elasticity of gas

Answer 194

Energy is minimum at nodes and maximum at antinodes

Answer 195

Energy is uniformly distributed

Answer 196

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 197

Energy is minimum at nodes and maximum at antidotes

Answer 198

Remain unaffected

Answer 199

Become infinite

Answer 200

Energy and linear momentum

Answer 201

Energy, momentum and mass

Answer 202

Energy and mass

Answer 203

Energy of radiation

Answer 204

Sound loudness

Answer 205

Intensity of light

Answer 206

x-ray radiation capacity

Answer 207

Frequency and velocity

Answer 208

Frequency and number of harmonic

Answer 209

Intensity and velocity

Answer 210

Intensity and frequency

Answer 211

Interference

Answer 212

Doppler effect

Answer 213

Beat phenomenon

Answer 214

The source is in motion

Answer 215

The detector is in motion

Answer 216

None of these

Answer 217

Both the above

Answer 218

Wave length

Answer 219

Phase difference

Answer 220

There is a gain of energy

Answer 221

The energy is redistributed and the distribution changes with time

Answer 222

The energy is redistributed and the distribution remains constant with time

Answer 223

There is a loss of energy

Answer 224

They require material medium for propagation

Answer 225

They do not have enough energy

Answer 226

They are transverse waves

Answer 227

They are stationary waves

Answer 228

Increased rapidly

Answer 229

None of these

Answer 230

Total Energy

Answer 231

P.E. Energy

Answer 232

K.E. Energy

Answer 233

Angular Momentum

Answer 234

Time period will not change

Answer 235

Time period will depend on the weight of the boy.

Answer 236

Time period will decrease

Answer 237

Time period will increase

Answer 238

Remains same

Answer 239

Increases or decreases depending on the material

Answer 240

Cannot be polarized

Answer 241

Cannot be diffracted

Answer 242

Do not affect photographic plate

Answer 243

Have a lower frequency

Answer 244

1/f seconds

Answer 245

1/T seconds

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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