Physics Waves Online Mcqs Test

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Question 1

1. A particle executes a simple harmonic motion of time period T. Find the time taken by the particle to go directly from its mean position to half the amplitude

Question 2

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

Answer

Independent of x

Question 3

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

Question 4

4. 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 5

5. The velocity of sound in air depends upon

Answer

Amplitude and frequency of sound

Answer

Wavelength of sound

Answer

Density and elasticity of gas

Question 6

6. 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 7

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

Answer

Temperature of air

Answer

The atmospheric pressure

Answer

Moisture contents in air

Answer

The composition of air

Question 8

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

Answer

Oscillation

Answer

None of these

Question 9

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

Answer

Quadruple the mass

Answer

Half the mass

Answer

Reduce the mass to one fourth

Answer

Double the mass

Question 10

10. 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 11

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

Answer

1343 ms¯¹

Answer

1567 ms¯¹

Answer

1483 ms¯¹

Answer

1214 ms¯¹

Question 12

12. Doppler-effect applies to

Answer

Sound wave only

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Both sound and light waves

Question 13

13. Fidelity refers to

Answer

Reproduction of a CD from original copy

Answer

Reproduction of music

Answer

Reproduction of original sound

Answer

Reproduction of original image

Question 14

14. In simple harmonic motion,

Answer

The velocity and displacement 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

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

Question 15

15. Sound waves in air always

Answer

Stationary

Answer

Longitudinal

Answer

Transverse

Answer

Electromagnetic

Question 16

16. 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 17

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 18

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

Answer

Becomes zero

Answer

Remains unchanged

Question 19

19. 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 20

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

Answer

Becomes double

Answer

Become one fourth

Answer

Becomes one half

Answer

Remains same

Question 21

21. 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 and same amplitude

Answer

Different frequencies

Question 22

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

Answer

Polarization

Answer

Refraction

Answer

Reflection

Answer

Diffraction

Question 23

23. 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

9 (β – α)

Answer

5 β – 4 α

Question 24

24. Beats are the results of

Answer

Polarization

Answer

Destructive interference

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Question 25

25. 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

300 Nm¯¹

Answer

100 Nm¯¹

Answer

700 Nm¯¹

Answer

143 Nm¯¹

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. Decibel is unit of

Answer

Sound loudness

Answer

Energy of radiation

Answer

x-ray radiation capacity

Answer

Intensity of light

Question 28

28. In stationary waves

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Question 29

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

Answer

None of these

Answer

Progressive wave

Answer

Transverse wave

Answer

Longitudinal waves

Question 30

30. 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 31

31. 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 32

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

Answer

Exponential

Answer

Hyperbolic

Answer

Logarithmic

Question 33

33. 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 34

34. 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 35

35. 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 capacity

Answer

Has a definite pitch

Answer

Can penetrate the wall

Answer

Has a definite quality

Question 36

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

Answer

None of these

Answer

Maximum in the extreme position

Answer

Zero in the mean position

Question 37

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

Answer

Gamma rays

Answer

Visible light

Answer

Ultra-violet rays

Answer

Infra-red radiation

Question 38

38. A system under going force vibrations is known as

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Driven harmonic oscillator

Question 39

39. Sound waves do not travel in vacuum because

Answer

They are stationary waves

Answer

They are transverse waves

Answer

They require material medium for propagation

Answer

They do not have enough energy

Question 40

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

Question 41

41. The distance between node and antinode is

Question 42

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

Answer

2,000 to 4,000 Hz

Answer

3,000 to 6,000 Hz

Answer

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Question 43

43. Velocity of sound in vacuum is

Question 44

44. 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 45

45. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Mechanical waves

Answer

None of these

Answer

Periodic waves

Question 46

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

Answer

Wave mechanics

Question 47

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

Answer

Cannot be polarized

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Do not affect photographic plate

Question 48

48. Energy is not carried by

Answer

Transverse progressive waves

Answer

Longitudinal vibration

Answer

Electromagnetic waves

Answer

Stationary waves

Question 49

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

Answer

Matter waves

Answer

Electromagnetic waves

Answer

Mechanical waves

Answer

Carrier waves

Question 50

50. 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 51

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

Question 52

52. In vibratory motion which parameter remains constant?

Answer

Total Energy

Answer

K.E. Energy

Answer

Angular Momentum

Answer

P.E. Energy

Question 53

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

Question 54

54. The distance between node and anti-node is

Question 55

55. 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 56

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

Answer

Simple Harmonic Motion

Answer

Circular Motion

Answer

Angular Motion

Answer

Rectilinear Motion

Question 57

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

Answer

Half that of the individual waves

Answer

Twice that of the individual waves

Answer

√2 that of the individual waves

Answer

Same as that of the individual waves

Question 58

58. The speed of sound in a medium depends on

Answer

Neither the elastic property nor the inertia property

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

Question 59

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

Question 60

60. The Doppler effect is produced if

Answer

The detector is in motion

Answer

The source is in motion

Answer

Both the above

Answer

None of these

Question 61

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

Answer

Wavelength

Answer

None of these

Question 62

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

Question 63

63. 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 not change

Answer

Time period will increase

Answer

Time period will depend on the weight of the boy.

Question 64

64. The velocity of sound is greatest in

Answer 163

Interference

Answer 164

Doppler effect

Answer 165

Beat phenomenon

Answer 166

Phase difference

Answer 167

Wave length

Answer 168

Remain unaffected

Answer 169

Become infinite

Answer 170

Remains constant

Answer 171

Becomes Zero

Answer 172

Sonic speed

Answer 173

Supersonic speed

Answer 174

Extra supersonic speed

Answer 175

None of these

Answer 176

None of these

Answer 177

Zero elastic modulus

Answer 178

Smaller elastic modules

Answer 179

Large elastic modulus

Answer 180

Interference

Answer 181

Reflection

Answer 182

Refraction

Answer 183

Polarization

Answer 184

Polarization

Answer 185

Diffraction

Answer 186

Interference

Answer 187

Refraction

Answer 188

2π second

Answer 189

4π second

Answer 190

Energy and mass

Answer 191

Energy, momentum and mass

Answer 192

Energy and linear momentum

Answer 193

Both pressure and density

Answer 194

Pressure only

Answer 195

Neither pressure nor density

Answer 196

Density only

Answer 197

Amplitude of motion will be very large

Answer 198

Amplitude of motion will be every small

Answer 199

Independent of amplitude of motion

Answer 200

None of these

Answer 201

Light waves

Answer 202

Sound waves

Answer 203

All of these

Answer 204

Water waves

Answer 205

None of these

Answer 206

Increased rapidly

Answer 207

An apparent increase in frequency

Answer 208

No apparent change in frequency

Answer 209

An apparent decrease in frequency

Answer 210

An apparent decrease in wavelength

Answer 211

None of these

Answer 212

Half way between them

Answer 213

Crossing mean position

Answer 214

Displacement is maximum

Answer 215

Constructive interference

Answer 216

Destructive interference

Answer 217

1/f seconds

Answer 218

1/T seconds

Answer 219

Energy is minimum at nodes and maximum at antidotes

Answer 220

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 221

Energy is minimum at nodes and maximum at antinodes

Answer 222

Energy is uniformly distributed

Answer 223

Quality factor is small

Answer 224

Restoring force is small

Answer 225

Applied periodic force is small

Answer 226

Damping force is small

Answer 227

Reverberation

Answer 228

Oscillation Time

Answer 229

Time period

Answer 230

Doppler effect

Answer 231

Interference of waves

Answer 232

All of these

Answer 233

Beats phenomena

Answer 234

There is a gain of energy

Answer 235

There is a loss of energy

Answer 236

The energy is redistributed and the distribution remains constant with time

Answer 237

The energy is redistributed and the distribution changes with time

Answer 238

6 times faster

Answer 239

√6 times slower

Answer 240

At correct rate

Answer 241

√6 times faster

Answer 242

When v is zero, α is zero

Answer 243

When v is maximum, α is maximum

Answer 244

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

Answer 245

When v is maximum, α is zero

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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