Physics Waves Online Mcqs Test

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Question 1

1. 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

Sonic speed

Answer

Extra supersonic speed

Question 2

2. 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 pitch

Answer

Has a definite quality

Answer

Has a definite capacity

Question 3

3. 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 4

4. Sound waves in air always

Answer

Longitudinal

Answer

Transverse

Answer

Electromagnetic

Answer

Stationary

Question 5

5. 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 6

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

Answer

Same as that of the individual waves

Answer

√2 that of the individual waves

Answer

Half that of the individual waves

Answer

Twice that of the individual waves

Question 7

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

Question 8

8. 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 9

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

Answer

1343 ms¯¹

Answer

1214 ms¯¹

Answer

1567 ms¯¹

Answer

1483 ms¯¹

Question 10

10. The speed of sound in a medium depends on

Answer

The elastic property as well as the inertia property

Answer

The inertia property but not on the elastic property

Answer

The elastic property but not on the inertia property

Answer

Neither the elastic property nor the inertia property

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

√k₁/k₂

Answer

√k₂/k₁

Question 12

12. 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 13

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

Question 14

14. Doppler-effect applies to

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Sound wave only

Answer

Both sound and light waves

Question 15

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

Answer

Frequency and velocity

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Answer

Intensity and velocity

Question 16

16. 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

Remain unaffected

Answer

Become infinite

Question 17

17. For production of beats the two sources must have

Answer

Different frequencies

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same amplitude

Answer

Different frequencies and same phase

Question 18

18. The velocity of sound is greatest in

Question 19

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

Answer

Interference

Answer

Beat phenomenon

Answer

Doppler effect

Question 20

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

Question 21

21. 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 22

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

Question 23

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

Answer

Applied periodic force is small

Answer

Restoring force is small

Answer

Quality factor is small

Answer

Damping force is small

Question 24

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

Answer

Remains constant

Answer

Becomes Zero

Question 25

25. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 26

26. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They are stationary waves

Answer

They require material medium for propagation

Answer

They are transverse waves

Question 27

27. In stationary waves

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Question 28

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

Answer

4π second

Answer

2π second

Question 29

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

Answer

Temperature of air

Answer

The atmospheric pressure

Answer

The composition of air

Answer

Moisture contents in air

Question 30

30. 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 31

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

Answer

Cannot be polarized

Answer

Do not affect photographic plate

Answer

Cannot be diffracted

Answer

Have a lower frequency

Question 32

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

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be every small

Answer

Amplitude of motion will be very large

Answer

None of these

Question 33

33. 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 34

34. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Water waves

Answer

Sound waves

Answer

Light waves

Question 35

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

Answer

Becomes zero

Answer

Remains unchanged

Question 36

36. Beats are the results of

Answer

Polarization

Answer

Diffraction of sound waves

Answer

Destructive interference

Answer

Constrictive and destructive interference

Question 37

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

Question 38

38. Energy is not carried by

Answer

Longitudinal vibration

Answer

Electromagnetic waves

Answer

Stationary waves

Answer

Transverse progressive waves

Question 39

39. The distance between node and antinode is

Question 40

40. Waves transmit _________ from one place to another

Answer

None of these

Question 41

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

Answer

Wave mechanics

Question 42

42. 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 43

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

Question 44

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

Answer

5,000 to 11,000 Hz

Answer

4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Answer

2,000 to 4,000 Hz

Question 45

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

Question 46

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

Question 47

47. 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 48

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

Answer

Reflection

Answer

Refraction

Answer

Interference

Answer

Polarization

Question 49

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

Answer

Remains same

Answer

Becomes double

Answer

Become one fourth

Answer

Becomes one half

Question 50

50. Decibel is unit of

Answer

Energy of radiation

Answer

Intensity of light

Answer

Sound loudness

Answer

x-ray radiation capacity

Question 51

51. 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 52

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

Answer

Ultra-violet rays

Answer

Infra-red radiation

Answer

Gamma rays

Answer

Visible light

Question 53

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

Answer

Reflection

Answer

Refraction

Answer

Polarization

Answer

Diffraction

Question 54

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

Answer

Time period

Answer

Reverberation

Answer

Oscillation Time

Question 55

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

Question 56

56. Velocity of sound in vacuum is

Question 57

57. In simple harmonic motion,

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

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

Question 58

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

Answer

Wavelength

Answer

None of these

Question 59

59. 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 maximum, α is zero

Answer

When v is zero, α is zero

Answer

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

Question 60

60. The Doppler effect is produced if

Answer

The detector is in motion

Answer

The source is in motion

Answer

None of these

Answer

Both the above

Question 61

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

Answer

1/T seconds

Answer

1/f seconds

Question 62

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 63

63. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 64

64. 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

Answer 158

Wave length

Answer 159

Phase difference

Answer 160

6 times faster

Answer 161

At correct rate

Answer 162

√6 times slower

Answer 163

√6 times faster

Answer 164

Independent of x

Answer 165

9 (β – α)

Answer 166

5 β – 4 α

Answer 167

5α – 4β

Answer 168

An apparent increase in frequency

Answer 169

No apparent change in frequency

Answer 170

An apparent decrease in wavelength

Answer 171

An apparent decrease in frequency

Answer 172

Time period will decrease

Answer 173

Time period will increase

Answer 174

Time period will not change

Answer 175

Time period will depend on the weight of the boy.

Answer 176

None of these

Answer 177

Oscillation

Answer 178

Angular Momentum

Answer 179

K.E. Energy

Answer 180

P.E. Energy

Answer 181

Total Energy

Answer 182

Angular Motion

Answer 183

Rectilinear Motion

Answer 184

Simple Harmonic Motion

Answer 185

Circular Motion

Answer 186

700 Nm¯¹

Answer 187

143 Nm¯¹

Answer 188

300 Nm¯¹

Answer 189

100 Nm¯¹

Answer 190

Both pressure and density

Answer 191

Density only

Answer 192

Pressure only

Answer 193

Neither pressure nor density

Answer 194

None of these

Answer 195

Increased rapidly

Answer 196

Energy is maximum at nodes and minimum at antidotes

Answer 197

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 198

Energy is uniformly distributed

Answer 199

Energy is minimum at nodes and maximum at antinodes

Answer 200

Reproduction of original sound

Answer 201

Reproduction of original image

Answer 202

Reproduction of music

Answer 203

Reproduction of a CD from original copy

Answer 204

Exponential

Answer 205

Hyperbolic

Answer 206

Logarithmic

Answer 207

Half the mass

Answer 208

Quadruple the mass

Answer 209

Double the mass

Answer 210

Reduce the mass to one fourth

Answer 211

Interference

Answer 212

Polarization

Answer 213

Diffraction

Answer 214

Refraction

Answer 215

Progressive wave

Answer 216

Transverse wave

Answer 217

Longitudinal waves

Answer 218

None of these

Answer 219

Transverse progressive

Answer 220

Transverse stationary

Answer 221

Longitudinal progressive

Answer 222

Longitudinal stationary

Answer 223

None of these

Answer 224

Zero elastic modulus

Answer 225

Large elastic modulus

Answer 226

Smaller elastic modules

Answer 227

Mechanical waves

Answer 228

Periodic waves

Answer 229

None of these

Answer 230

Progressive waves

Answer 231

Displacement is maximum

Answer 232

Crossing mean position

Answer 233

Half way between them

Answer 234

Interference of waves

Answer 235

Beats phenomena

Answer 236

All of these

Answer 237

Doppler effect

Answer 238

There is a loss of energy

Answer 239

There is a gain of energy

Answer 240

The energy is redistributed and the distribution changes with time

Answer 241

The energy is redistributed and the distribution remains constant with time

Answer 242

Matter waves

Answer 243

Mechanical waves

Answer 244

Carrier waves

Answer 245

Electromagnetic waves

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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