Physics Waves Online Mcqs Test

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Question 1

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

Answer

The composition of air

Answer

Moisture contents in air

Answer

Temperature of air

Answer

The atmospheric pressure

Question 2

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

Question 3

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

Answer

Matter waves

Answer

Mechanical waves

Answer

Carrier waves

Answer

Electromagnetic waves

Question 4

4. 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

100 Nm¯¹

Answer

300 Nm¯¹

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Question 5

5. Silence zone takes place due to

Answer

Destructive interference

Answer

Constructive interference

Question 6

6. A system under going force vibrations is known as

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Driven harmonic oscillator

Question 7

7. Fidelity refers to

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original image

Answer

Reproduction of original sound

Answer

Reproduction of music

Question 8

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

Answer

Wavelength

Answer

None of these

Question 9

9. 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 10

10. 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 11

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 12

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

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Supersonic speed

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Sonic speed

Answer

None of these

Answer

Extra supersonic speed

Question 13

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

Answer

1/T seconds

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1/f seconds

Question 14

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

Answer

Independent of x

Question 15

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

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Beat phenomenon

Answer

Interference

Answer

Doppler effect

Question 16

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

Answer

Wave mechanics

Question 17

17. The Doppler effect is produced if

Answer

None of these

Answer

Both the above

Answer

The detector is in motion

Answer

The source is in motion

Question 18

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

Answer

2,000 to 4,000 Hz

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4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Question 19

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

Question 20

20. 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 21

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

Answer

Zero in the mean position

Answer

None of these

Answer

Maximum in the extreme position

Question 22

22. 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 23

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

Answer

Interference

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Question 24

24. 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 25

25. 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 26

26. 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 27

27. 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 28

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

Answer

Angular Motion

Answer

Circular Motion

Answer

Rectilinear Motion

Answer

Simple Harmonic Motion

Question 29

29. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Periodic waves

Answer

Mechanical waves

Answer

None of these

Question 30

30. 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 31

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

Question 32

32. 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 zero

Answer

When v is zero, α is zero

Answer

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

Answer

When v is maximum, α is maximum

Question 33

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

Answer

Refraction

Answer

Diffraction

Answer

Reflection

Answer

Polarization

Question 34

34. The velocity of sound is greatest in

Question 35

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

Answer

√6 times slower

Answer

At correct rate

Answer

√6 times faster

Answer

6 times faster

Question 36

36. The distance between node and antinode is

Question 37

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

Question 38

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

Answer

Transverse wave

Answer

Progressive wave

Answer

Longitudinal waves

Answer

None of these

Question 39

39. The speed of sound in a medium depends on

Answer

Neither the elastic property nor the inertia property

Answer

The elastic property but not on the inertia property

Answer

The elastic property as well as the inertia property

Answer

The inertia property but not on the elastic property

Question 40

40. The gases have a

Answer

Large elastic modulus

Answer

Zero elastic modulus

Answer

None of these

Answer

Smaller elastic modules

Question 41

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

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Do not affect photographic plate

Question 42

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

Answer

Exponential

Answer

Logarithmic

Answer

Hyperbolic

Question 43

43. Decibel is unit of

Answer

Sound loudness

Answer

Energy of radiation

Answer

Intensity of light

Answer

x-ray radiation capacity

Question 44

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

Answer

Remains unchanged

Answer

Becomes zero

Question 45

45. Sound waves in air always

Answer

Stationary

Answer

Longitudinal

Answer

Transverse

Answer

Electromagnetic

Question 46

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

Answer

Restoring force is small

Answer

Quality factor is small

Answer

Damping force is small

Answer

Applied periodic force is small

Question 47

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

Answer

Both pressure and density

Answer

Neither pressure nor density

Answer

Pressure only

Answer

Density only

Question 48

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

Question 49

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

Answer

Become one fourth

Answer

Remains same

Answer

Becomes double

Answer

Becomes one half

Question 50

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

Answer

Independent of amplitude of motion

Answer

None of these

Answer

Amplitude of motion will be every small

Answer

Amplitude of motion will be very large

Question 51

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

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Answer

1214 ms¯¹

Answer

1483 ms¯¹

Question 52

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

Answer

Reverberation

Answer

Time period

Answer

Oscillation Time

Question 53

53. Beats are the results of

Answer

Diffraction of sound waves

Answer

Polarization

Answer

Destructive interference

Answer

Constrictive and destructive interference

Question 54

54. 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 and linear momentum

Answer

Energy, momentum and mass

Question 55

55. 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 56

56. 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 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. 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

Twice that of the individual waves

Answer

Half that of the individual waves

Question 59

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

Answer

4π second

Answer

2π second

Question 60

60. Velocity of sound in vacuum is

Question 61

61. Energy is not carried by

Answer

Transverse progressive waves

Answer

Stationary waves

Answer

Longitudinal vibration

Answer

Electromagnetic waves

Question 62

62. 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 63

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

Answer

Double the mass

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Answer

Half the mass

Question 64

64. Doppler-effect applies to

Answer

Sound wave only

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Both sound and light waves

Answer 174

They require material medium for propagation

Answer 175

They do not have enough energy

Answer 176

They are transverse waves

Answer 177

They are stationary waves

Answer 178

None of these

Answer 179

Sometimes in phase

Answer 180

Out of phase

Answer 181

Displacement is maximum

Answer 182

Half way between them

Answer 183

Crossing mean position

Answer 184

Wavelength of sound

Answer 185

Density and elasticity of gas

Answer 186

Amplitude and frequency of sound

Answer 187

Has a definite pitch

Answer 188

Has a definite capacity

Answer 189

Can penetrate the wall

Answer 190

Has a definite quality

Answer 191

Becomes Zero

Answer 192

Remains constant

Answer 193

Phase difference

Answer 194

Wave length

Answer 195

Total Energy

Answer 196

P.E. Energy

Answer 197

Angular Momentum

Answer 198

K.E. Energy

Answer 199

An apparent increase in frequency

Answer 200

An apparent decrease in frequency

Answer 201

No apparent change in frequency

Answer 202

An apparent decrease in wavelength

Answer 203

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 204

Energy is minimum at nodes and maximum at antinodes

Answer 205

Energy is uniformly distributed

Answer 206

Energy is maximum at nodes and minimum at antidotes

Answer 207

All of these

Answer 208

Interference of waves

Answer 209

Beats phenomena

Answer 210

Doppler effect

Answer 211

Interference

Answer 212

Polarization

Answer 213

Reflection

Answer 214

Refraction

Answer 215

None of these

Answer 216

Time period will increase

Answer 217

Time period will decrease

Answer 218

Time period will not change

Answer 219

Time period will depend on the weight of the boy.

Answer 220

Sound waves

Answer 221

Light waves

Answer 222

Water waves

Answer 223

All of these

Answer 224

Intensity and frequency

Answer 225

Frequency and number of harmonic

Answer 226

Intensity and velocity

Answer 227

Frequency and velocity

Answer 228

None of these

Answer 229

Oscillation

Answer 230

None of these

Answer 231

Increased rapidly

Answer 232

Different frequencies and same phase

Answer 233

Different frequencies

Answer 234

Different frequencies, same amplitude and same phase

Answer 235

Different frequencies and same amplitude

Answer 236

Remain unaffected

Answer 237

Become infinite

Answer 238

Transverse progressive

Answer 239

Longitudinal progressive

Answer 240

Transverse stationary

Answer 241

Longitudinal stationary

Answer 242

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

Answer 243

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

Answer 244

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

Answer 245

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

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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