Physics Waves Online Mcqs Test

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Question 1

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

Question 2

2. The gases have a

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Answer

None of these

Question 3

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

Answer

The composition of air

Answer

Moisture contents in air

Answer

The atmospheric pressure

Answer

Temperature of air

Question 4

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

Answer

Polarization

Answer

Reflection

Answer

Diffraction

Answer

Refraction

Question 5

5. For production of beats the two sources must have

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies and same phase

Answer

Different frequencies

Question 6

6. The velocity of sound is greatest in

Question 7

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

Question 8

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

Answer

A straight line

Answer

An ellipse

Answer

A hyperbola

Question 9

9. 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

143 Nm¯¹

Answer

100 Nm¯¹

Answer

300 Nm¯¹

Answer

700 Nm¯¹

Question 10

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 11

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

Answer

1/f seconds

Answer

1/T seconds

Question 12

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

Answer

Longitudinal progressive

Answer

Longitudinal stationary

Answer

Transverse progressive

Answer

Transverse stationary

Question 13

13. The speed of sound in a medium depends on

Answer

The elastic property as well as the inertia property

Answer

The elastic property but not on the inertia property

Answer

The inertia property but not on the elastic property

Answer

Neither the elastic property nor the inertia property

Question 14

14. Sound waves do not travel in vacuum because

Answer

They are stationary waves

Answer

They require material medium for propagation

Answer

They do not have enough energy

Answer

They are transverse waves

Question 15

15. Fidelity refers to

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original sound

Answer

Reproduction of original image

Answer

Reproduction of music

Question 16

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

Answer

2π second

Answer

4π second

Question 17

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

Answer

There is a loss 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 gain of energy

Question 18

18. 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 19

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

Answer

Density only

Answer

Both pressure and density

Answer

Neither pressure nor density

Answer

Pressure only

Question 20

20. 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 21

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

Question 22

22. 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 23

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

Answer

Gamma rays

Answer

Ultra-violet rays

Answer

Infra-red radiation

Answer

Visible light

Question 24

24. 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 25

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

Question 26

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

Question 27

27. Energy is not carried by

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Answer

Transverse progressive waves

Answer

Stationary waves

Question 28

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

Question 29

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

Answer

3,000 to 6,000 Hz

Answer

4,000 to 8,000 Hz

Answer

2,000 to 4,000 Hz

Answer

5,000 to 11,000 Hz

Question 30

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

Answer

Wavelength

Answer

None of these

Question 31

31. 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 32

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

Question 33

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

Question 34

34. 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 35

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

Answer

Remains unchanged

Answer

Becomes zero

Question 36

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

Answer

Oscillation

Answer

None of these

Question 37

37. The distance between node and antinode is

Question 38

38. 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 39

39. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 40

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

Answer

Hyperbolic

Answer

Logarithmic

Answer

Exponential

Question 41

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

Answer

Supersonic speed

Answer

None of these

Answer

Sonic speed

Answer

Extra supersonic speed

Question 42

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

Answer

Interference

Answer

Beat phenomenon

Answer

Doppler effect

Question 43

43. A pendulum clock that keeps correct time on the Earth is taken to the Moon. It will run

Answer

At correct rate

Answer

√6 times faster

Answer

√6 times slower

Answer

6 times faster

Question 44

44. 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 45

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

Answer

Reverberation

Answer

Oscillation Time

Answer

Time period

Question 46

46. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Question 47

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

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Answer

Frequency and velocity

Question 48

48. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

None of these

Answer

Periodic waves

Answer

Mechanical waves

Question 49

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

Answer

None of these

Answer

Increased rapidly

Question 50

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

Answer

Amplitude of motion will be very large

Answer

None of these

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be every small

Question 51

51. 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 52

52. 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 53

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

Answer

Sometimes in phase

Answer

None of these

Answer

Out of phase

Question 54

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

Question 55

55. 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 56

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

Answer

Interference

Answer

Refraction

Answer

Diffraction

Answer

Polarization

Question 57

57. In stationary waves

Answer

Energy is minimum at nodes and maximum at antidotes

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

Question 58

58. 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 depend on the weight of the boy.

Answer

Time period will increase

Answer

Time period will not change

Question 59

59. 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 60

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

Answer

Reflection

Answer

Interference

Answer

Polarization

Answer

Refraction

Question 61

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

Answer

Independent of x

Question 62

62. 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 63

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

Question 64

64. Waves transmit _________ from one place to another

Answer

None of these

Answer 158

Phase difference

Answer 159

Wave length

Answer 160

Wave mechanics

Answer 161

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

Answer 162

When v is zero, α is zero

Answer 163

When v is maximum, α is zero

Answer 164

When v is maximum, α is maximum

Answer 165

Quadruple the mass

Answer 166

Half the mass

Answer 167

Reduce the mass to one fourth

Answer 168

Double the mass

Answer 169

Becomes double

Answer 170

Remains same

Answer 171

Become one fourth

Answer 172

Becomes one half

Answer 173

Constrictive and destructive interference

Answer 174

Polarization

Answer 175

Diffraction of sound waves

Answer 176

Destructive interference

Answer 177

Zero in the mean position

Answer 178

Maximum in the extreme position

Answer 179

None of these

Answer 180

Electromagnetic waves

Answer 181

Matter waves

Answer 182

Mechanical waves

Answer 183

Carrier waves

Answer 184

Angular Momentum

Answer 185

Total Energy

Answer 186

K.E. Energy

Answer 187

P.E. Energy

Answer 188

5α – 4β

Answer 189

5 β – 4 α

Answer 190

9 (β – α)

Answer 191

1483 ms¯¹

Answer 192

1214 ms¯¹

Answer 193

1567 ms¯¹

Answer 194

1343 ms¯¹

Answer 195

Light waves

Answer 196

All of these

Answer 197

Water waves

Answer 198

Sound waves

Answer 199

Stationary

Answer 200

Electromagnetic

Answer 201

Transverse

Answer 202

Longitudinal

Answer 203

Intensity of light

Answer 204

Energy of radiation

Answer 205

x-ray radiation capacity

Answer 206

Sound loudness

Answer 207

Energy is uniformly distributed

Answer 208

Energy is maximum at nodes and minimum at antidotes

Answer 209

Energy is minimum at nodes and maximum at antinodes

Answer 210

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 211

An apparent increase in frequency

Answer 212

An apparent decrease in frequency

Answer 213

No apparent change in frequency

Answer 214

An apparent decrease in wavelength

Answer 215

Interference of waves

Answer 216

Beats phenomena

Answer 217

Doppler effect

Answer 218

All of these

Answer 219

Simple Harmonic Motion

Answer 220

Angular Motion

Answer 221

Rectilinear Motion

Answer 222

Circular Motion

Answer 223

Do not affect photographic plate

Answer 224

Cannot be diffracted

Answer 225

Have a lower frequency

Answer 226

Cannot be polarized

Answer 227

√k₁k₂

Answer 228

k₁ k₂/( k₁+k₂)

Answer 229

(k₁+k₂)/2

Answer 230

√2 that of the individual waves

Answer 231

Twice that of the individual waves

Answer 232

Half that of the individual waves

Answer 233

Same as that of the individual waves

Answer 234

Remains constant

Answer 235

Becomes Zero

Answer 236

Energy and linear momentum

Answer 237

Energy, momentum and mass

Answer 238

Energy and mass

Answer 239

Progressive wave

Answer 240

None of these

Answer 241

Transverse wave

Answer 242

Longitudinal waves

Answer 243

Crossing mean position

Answer 244

Half way between them

Answer 245

Displacement is maximum

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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