Physics Waves Online Mcqs Test

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Question 1

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

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Do not affect photographic plate

Answer

Cannot be diffracted

Question 2

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

Answer

Doppler effect

Answer

Beat phenomenon

Answer

Interference

Question 3

3. 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 4

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

Answer

None of these

Answer

Sonic speed

Answer

Extra supersonic speed

Answer

Supersonic speed

Question 5

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 6

6. 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 7

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

Question 8

8. The Doppler effect is produced if

Answer

The detector is in motion

Answer

None of these

Answer

The source is in motion

Answer

Both the above

Question 9

9. 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 10

10. 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 11

11. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Water waves

Answer

Light waves

Answer

Sound waves

Question 12

12. 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 13

13. 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 zero, α is zero

Answer

When v is maximum, α is zero

Question 14

14. 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

An apparent decrease in wavelength

Answer

No apparent change in frequency

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. 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

Neither the elastic property nor the inertia property

Answer

The elastic property but not on the inertia property

Question 17

17. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

None of these

Answer

Progressive waves

Answer

Periodic waves

Question 18

18. Doppler-effect applies to

Answer

Both sound and light waves

Answer

Neither sound nor light wave

Answer

Sound wave only

Answer

Light wave only

Question 19

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

Answer

Mechanical waves

Answer

Matter waves

Answer

Carrier waves

Answer

Electromagnetic waves

Question 20

20. Energy is not carried by

Answer

Longitudinal vibration

Answer

Stationary waves

Answer

Transverse progressive waves

Answer

Electromagnetic waves

Question 21

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

Answer

Wave length

Answer

Phase difference

Question 22

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

Question 23

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

Answer

Doppler effect

Answer

All of these

Answer

Interference of waves

Answer

Beats phenomena

Question 24

24. 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 capacity

Answer

Can penetrate the wall

Answer

Has a definite pitch

Question 25

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

Question 26

26. 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 27

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

Question 28

28. A system under going force vibrations is known as

Answer

Vibration harmonic oscillator

Answer

Driven harmonic oscillator

Answer

Frequency harmonic oscillator

Question 29

29. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 30

30. 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 31

31. 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 32

32. Beats are the results of

Answer

Destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Answer

Constrictive and destructive interference

Question 33

33. The gases have a

Answer

Zero elastic modulus

Answer

Large elastic modulus

Answer

None of these

Answer

Smaller elastic modules

Question 34

34. 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 35

35. The velocity of sound is greatest in

Question 36

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

Question 37

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

Answer

None of these

Answer

Zero in the mean position

Answer

Maximum in the extreme position

Question 38

38. Decibel is unit of

Answer

x-ray radiation capacity

Answer

Sound loudness

Answer

Energy of radiation

Answer

Intensity of light

Question 39

39. 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 not change

Answer

Time period will increase

Question 40

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

Answer

Polarization

Answer

Refraction

Answer

Reflection

Answer

Interference

Question 41

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

Answer

None of these

Answer

Increased rapidly

Question 42

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

Answer

Half that of the individual waves

Answer

Same as that of the individual waves

Answer

Twice that of the individual waves

Answer

√2 that of the individual waves

Question 43

43. Velocity of sound in vacuum is

Question 44

44. The distance between node and anti-node is

Question 45

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

Answer

Oscillation Time

Answer

Time period

Answer

Reverberation

Question 46

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

Answer

Half the mass

Answer

Double the mass

Answer

Reduce the mass to one fourth

Answer

Quadruple the mass

Question 47

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

Answer

Out of phase

Answer

Sometimes in phase

Answer

None of these

Question 48

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

Answer

Wave mechanics

Question 49

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

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Answer

Angular Motion

Answer

Circular Motion

Question 50

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

Answer

Remains unchanged

Answer

Becomes zero

Question 51

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

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and velocity

Answer

Frequency and number of harmonic

Question 52

52. Sound waves in air always

Answer

Transverse

Answer

Electromagnetic

Answer

Longitudinal

Answer

Stationary

Question 53

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

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Question 54

54. Waves transmit _________ from one place to another

Answer

None of these

Question 55

55. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They are stationary waves

Answer

They are transverse waves

Answer

They require material medium for propagation

Question 56

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

Answer

Density only

Answer

Both pressure and density

Answer

Pressure only

Answer

Neither pressure nor density

Question 57

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

Question 58

58. 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 59

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

Question 60

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

Answer

1/f seconds

Answer

1/T seconds

Question 61

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

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be every small

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Amplitude of motion will be very large

Answer

None of these

Question 62

62. 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

5α – 4β

Answer

5 β – 4 α

Answer

9 (β – α)

Question 63

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

Answer

Polarization

Answer

Reflection

Answer

Diffraction

Answer

Refraction

Question 64

64. 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:

Answer 168

2π second

Answer 169

4π second

Answer 170

Longitudinal progressive

Answer 171

Transverse progressive

Answer 172

Longitudinal stationary

Answer 173

Transverse stationary

Answer 174

Logarithmic

Answer 175

Hyperbolic

Answer 176

Exponential

Answer 177

The composition of air

Answer 178

The atmospheric pressure

Answer 179

Temperature of air

Answer 180

Moisture contents in air

Answer 181

None of these

Answer 182

Wavelength

Answer 183

K.E. Energy

Answer 184

Angular Momentum

Answer 185

P.E. Energy

Answer 186

Total Energy

Answer 187

The energy is redistributed and the distribution changes with time

Answer 188

There is a loss of energy

Answer 189

The energy is redistributed and the distribution remains constant with time

Answer 190

There is a gain of energy

Answer 191

Independent of x

Answer 192

Energy is uniformly distributed

Answer 193

Energy is minimum at nodes and maximum at antinodes

Answer 194

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 195

Energy is maximum at nodes and minimum at antidotes

Answer 196

1343 ms¯¹

Answer 197

1214 ms¯¹

Answer 198

1567 ms¯¹

Answer 199

1483 ms¯¹

Answer 200

Remains constant

Answer 201

Becomes Zero

Answer 202

Polarization

Answer 203

Diffraction

Answer 204

Interference

Answer 205

Refraction

Answer 206

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

Answer 207

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

Answer 208

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

Answer 209

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

Answer 210

Remains same

Answer 211

Becomes one half

Answer 212

Become one fourth

Answer 213

Becomes double

Answer 214

A straight line

Answer 215

An ellipse

Answer 216

A hyperbola

Answer 217

√6 times faster

Answer 218

6 times faster

Answer 219

At correct rate

Answer 220

√6 times slower

Answer 221

Oscillation

Answer 222

None of these

Answer 223

Different frequencies and same amplitude

Answer 224

Different frequencies, same amplitude and same phase

Answer 225

Different frequencies and same phase

Answer 226

Different frequencies

Answer 227

Progressive wave

Answer 228

Longitudinal waves

Answer 229

None of these

Answer 230

Transverse wave

Answer 231

100 Nm¯¹

Answer 232

143 Nm¯¹

Answer 233

700 Nm¯¹

Answer 234

300 Nm¯¹

Answer 235

Energy is uniformly distributed

Answer 236

Energy is minimum at nodes and maximum at antinodes

Answer 237

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 238

Energy is minimum at nodes and maximum at antidotes

Answer 239

Wavelength of sound

Answer 240

Density and elasticity of gas

Answer 241

Amplitude and frequency of sound

Answer 242

Reproduction of original sound

Answer 243

Reproduction of music

Answer 244

Reproduction of original image

Answer 245

Reproduction of a CD from original copy

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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