Physics Waves Online Mcqs Test

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Question 1

1. 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 2

2. 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 3

3. In stationary waves

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Question 4

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

Question 5

5. 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 zero, α is zero

Answer

When v is maximum, 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 6

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

Answer

Phase difference

Answer

Wave length

Question 7

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

Question 8

8. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Question 9

9. 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 10

10. Decibel is unit of

Answer

Energy of radiation

Answer

Sound loudness

Answer

Intensity of light

Answer

x-ray radiation capacity

Question 11

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

Answer

Logarithmic

Answer

Exponential

Answer

Hyperbolic

Question 12

12. 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 13

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

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Cannot be diffracted

Answer

Do not affect photographic plate

Question 14

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

Answer

An ellipse

Answer

A straight line

Answer

A hyperbola

Question 15

15. 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 16

16. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 17

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

Question 18

18. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

K.E. Energy

Answer

Total Energy

Answer

P.E. Energy

Question 19

19. 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 20

20. 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

Has a definite quality

Answer

Can penetrate the wall

Question 21

21. The gases have a

Answer

None of these

Answer

Large elastic modulus

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Question 22

22. 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 velocity and acceleration 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

Question 23

23. 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 24

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

Answer

Simple Harmonic Motion

Answer

Angular Motion

Answer

Rectilinear Motion

Answer

Circular Motion

Question 25

25. A system under going force vibrations is known as

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Driven harmonic oscillator

Question 26

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

Answer

None of these

Answer

Increased rapidly

Question 27

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

Answer

5,000 to 11,000 Hz

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Answer

3,000 to 6,000 Hz

Question 28

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

Answer

Longitudinal stationary

Answer

Transverse stationary

Answer

Transverse progressive

Answer

Longitudinal progressive

Question 29

29. 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 30

30. 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 31

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

Answer

Reverberation

Answer

Oscillation Time

Answer

Time period

Question 32

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

Question 33

33. Velocity of sound in vacuum is

Question 34

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

Answer

None of these

Answer

Wavelength

Question 35

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

Answer

Pressure only

Answer

Neither pressure nor density

Answer

Density only

Answer

Both pressure and density

Question 36

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

Answer

Intensity and frequency

Answer

Intensity and velocity

Answer

Frequency and velocity

Answer

Frequency and number of harmonic

Question 37

37. When the source of sound moves away form a stationary listener then _________ occurs.

Answer

An apparent decrease in wavelength

Answer

No apparent change in frequency

Answer

An apparent decrease in frequency

Answer

An apparent increase in frequency

Question 38

38. 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 39

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

Answer

Damping force is small

Answer

Quality factor is small

Answer

Restoring force is small

Answer

Applied periodic force is small

Question 40

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

Question 41

41. The distance between node and antinode is

Question 42

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

Answer

The composition of air

Answer

The atmospheric pressure

Answer

Temperature of air

Answer

Moisture contents in air

Question 43

43. For production of beats the two sources must have

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies and same phase

Answer

Different frequencies

Answer

Different frequencies and same amplitude

Question 44

44. The velocity of sound is greatest in

Question 45

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

Question 46

46. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Sound waves

Answer

Light waves

Answer

Water waves

Question 47

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

Question 48

48. 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 49

49. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They require material medium for propagation

Answer

They are stationary waves

Answer

They are transverse waves

Question 50

50. Energy is not carried by

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Answer

Stationary waves

Answer

Transverse progressive waves

Question 51

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

Answer

The energy is redistributed and the distribution changes with time

Answer

There is a gain of energy

Answer

There is a loss of energy

Answer

The energy is redistributed and the distribution remains constant with time

Question 52

52. Waves transmit _________ from one place to another

Answer

None of these

Question 53

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

Answer

Reduce the mass to one fourth

Answer

Double the mass

Answer

Half the mass

Answer

Quadruple the mass

Question 54

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

Answer

Carrier waves

Answer

Electromagnetic waves

Answer

Mechanical waves

Answer

Matter waves

Question 55

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

Answer

Increases or decreases depending on the material

Answer

Remains same

Question 56

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

Answer

Independent of x

Question 57

57. 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

Supersonic speed

Answer

Extra supersonic speed

Question 58

58. Sound waves in air always

Answer

Transverse

Answer

Longitudinal

Answer

Stationary

Answer

Electromagnetic

Question 59

59. Fidelity refers to

Answer

Reproduction of music

Answer

Reproduction of original image

Answer

Reproduction of original sound

Answer

Reproduction of a CD from original copy

Question 60

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

Answer

1/f seconds

Answer

1/T seconds

Question 61

61. An oscillating mass-spring system generates

Answer

None of these

Answer

Periodic waves

Answer

Mechanical waves

Answer

Progressive waves

Question 62

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

Question 63

63. 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 64

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

Answer

2π second

Answer

4π second

Answer 167

Diffraction

Answer 168

Refraction

Answer 169

Reflection

Answer 170

Polarization

Answer 171

Wave mechanics

Answer 172

Oscillation

Answer 173

None of these

Answer 174

Energy and linear momentum

Answer 175

Energy and mass

Answer 176

Energy, momentum and mass

Answer 177

Progressive wave

Answer 178

Transverse wave

Answer 179

None of these

Answer 180

Longitudinal waves

Answer 181

1567 ms¯¹

Answer 182

1343 ms¯¹

Answer 183

1483 ms¯¹

Answer 184

1214 ms¯¹

Answer 185

Remains constant

Answer 186

Becomes Zero

Answer 187

(k₁+k₂)/2

Answer 188

k₁ k₂/( k₁+k₂)

Answer 189

√k₁k₂

Answer 190

Time period will depend on the weight of the boy.

Answer 191

Time period will not change

Answer 192

Time period will decrease

Answer 193

Time period will increase

Answer 194

Sound wave only

Answer 195

Light wave only

Answer 196

Both sound and light waves

Answer 197

Neither sound nor light wave

Answer 198

Remains same

Answer 199

Becomes double

Answer 200

Becomes one half

Answer 201

Become one fourth

Answer 202

Independent of amplitude of motion

Answer 203

Amplitude of motion will be every small

Answer 204

Amplitude of motion will be very large

Answer 205

None of these

Answer 206

Reflection

Answer 207

Interference

Answer 208

Refraction

Answer 209

Polarization

Answer 210

Remains unchanged

Answer 211

Becomes zero

Answer 212

Crossing mean position

Answer 213

Half way between them

Answer 214

Displacement is maximum

Answer 215

Constrictive and destructive interference

Answer 216

Destructive interference

Answer 217

Diffraction of sound waves

Answer 218

Polarization

Answer 219

Interference

Answer 220

Beat phenomenon

Answer 221

Doppler effect

Answer 222

143 Nm¯¹

Answer 223

700 Nm¯¹

Answer 224

300 Nm¯¹

Answer 225

100 Nm¯¹

Answer 226

The elastic property but not on the inertia property

Answer 227

The elastic property as well as the inertia property

Answer 228

The inertia property but not on the elastic property

Answer 229

Neither the elastic property nor the inertia property

Answer 230

6 times faster

Answer 231

√6 times slower

Answer 232

√6 times faster

Answer 233

At correct rate

Answer 234

Doppler effect

Answer 235

Interference of waves

Answer 236

All of these

Answer 237

Beats phenomena

Answer 238

The detector is in motion

Answer 239

Both the above

Answer 240

None of these

Answer 241

The source is in motion

Answer 242

Polarization

Answer 243

Interference

Answer 244

Diffraction

Answer 245

Refraction

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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Malik Tahir

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