Physics Waves Online Mcqs Test

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Question 1

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

Answer

Half the mass

Answer

Double the mass

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Reduce the mass to one fourth

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Quadruple the mass

Question 2

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

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Zero in the mean position

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Maximum in the extreme position

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None of these

Question 3

3. The distance between node and anti-node is

Question 4

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

Question 5

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

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1/T seconds

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1/f seconds

Question 6

6. Which one of the following statements is true for the speed v and the acceleration α of a particle executing simple harmonic motion?

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When v is maximum, α is zero

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

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When v is maximum, α is maximum

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When v is zero, α is zero

Question 7

7. 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 8

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

Answer

4π second

Answer

2π second

Question 9

9. 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 10

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

Answer

None of these

Answer

Wavelength

Question 11

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

Answer

Applied periodic force is small

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Damping force is small

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Restoring force is small

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Quality factor is small

Question 12

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

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Increased rapidly

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None of these

Question 13

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

Question 14

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

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Reverberation

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Time period

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Oscillation Time

Question 15

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

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Remains constant

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Becomes Zero

Question 16

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

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None of these

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Amplitude of motion will be very large

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Independent of amplitude of motion

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Amplitude of motion will be every small

Question 17

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

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Doppler effect

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Beats phenomena

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Interference of waves

Answer

All of these

Question 18

18. 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 19

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

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Carrier waves

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Mechanical waves

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Matter waves

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Electromagnetic waves

Question 20

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 21

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

Answer

None of these

Answer

Sometimes in phase

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Out of phase

Question 22

22. The gases have a

Answer

Smaller elastic modules

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Zero elastic modulus

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None of these

Answer

Large elastic modulus

Question 23

23. Two springs of spring constants k₁ and k₂ are joined in series. The effective spring constant of the combination is given by

Answer

√k₁k₂

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(k₁+k₂)/2

Answer

k₁ k₂/( k₁+k₂)

Question 24

24. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

P.E. Energy

Answer

K.E. Energy

Answer

Total Energy

Question 25

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

Answer

Phase difference

Answer

Wave length

Question 26

26. 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

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Time period will increase

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Time period will depend on the weight of the boy.

Question 27

27. In simple harmonic motion,

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

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

Answer

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

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

Question 28

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

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Longitudinal stationary

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Transverse stationary

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Longitudinal progressive

Answer

Transverse progressive

Question 29

29. The distance between node and antinode is

Question 30

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

Answer

A straight line

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An ellipse

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A hyperbola

Question 31

31. The velocity of sound is greatest in

Question 32

32. For production of beats the two sources must have

Answer

Different frequencies and same amplitude

Answer

Different frequencies

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Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Question 33

33. The speed of sound in a medium depends on

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The inertia property but not on the elastic property

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The elastic property but not on the inertia property

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The elastic property as well as the inertia property

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Neither the elastic property nor the inertia property

Question 34

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

Question 35

35. Energy is not carried by

Answer

Longitudinal vibration

Answer

Transverse progressive waves

Answer

Electromagnetic waves

Answer

Stationary waves

Question 36

36. 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 37

37. 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 38

38. 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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Extra supersonic speed

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Sonic speed

Answer

None of these

Question 39

39. 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 40

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

Answer

Interference

Answer

Beat phenomenon

Answer

Doppler effect

Question 41

41. 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

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Has a definite pitch

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Can penetrate the wall

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Has a definite capacity

Question 42

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

Answer

Polarization

Answer

Refraction

Answer

Interference

Answer

Diffraction

Question 43

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

Answer

Polarization

Answer

Refraction

Answer

Reflection

Answer

Diffraction

Question 44

44. Beats are the results of

Answer

Destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Answer

Constrictive and destructive interference

Question 45

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

Answer

Independent of x

Question 46

46. 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 47

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

Answer

Ultra-violet rays

Answer

Visible light

Answer

Gamma rays

Answer

Infra-red radiation

Question 48

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

Answer

At correct rate

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6 times faster

Answer

√6 times faster

Answer

√6 times slower

Question 49

49. In stationary waves

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Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Question 50

50. Fidelity refers to

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Reproduction of a CD from original copy

Answer

Reproduction of original image

Answer

Reproduction of music

Answer

Reproduction of original sound

Question 51

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

Answer

1214 ms¯¹

Answer

1483 ms¯¹

Answer

1343 ms¯¹

Answer

1567 ms¯¹

Question 52

52. Sound waves in air always

Answer

Electromagnetic

Answer

Longitudinal

Answer

Stationary

Answer

Transverse

Question 53

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

Question 54

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

Answer

Wave mechanics

Question 55

55. In stationary waves

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Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

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Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Question 56

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

Question 57

57. What sort of waves exhibit the Doppler effect?

Answer

Water waves

Answer

Light waves

Answer

All of these

Answer

Sound waves

Question 58

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

Answer

Reflection

Answer

Interference

Answer

Refraction

Answer

Polarization

Question 59

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

Answer

Exponential

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Hyperbolic

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Logarithmic

Question 60

60. 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

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5 β – 4 α

Answer

9 (β – α)

Question 61

61. The velocity of sound in air depends upon

Answer

Wavelength of sound

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Density and elasticity of gas

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Amplitude and frequency of sound

Question 62

62. Doppler-effect applies to

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Light wave only

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Sound wave only

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Neither sound nor light wave

Answer

Both sound and light waves

Question 63

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

Answer

Temperature of air

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Moisture contents in air

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The atmospheric pressure

Answer

The composition of air

Question 64

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

Answer

Intensity and velocity

Answer

Frequency and number of harmonic

Answer

Frequency and velocity

Answer

Intensity and frequency

Answer 174

Pressure only

Answer 175

Neither pressure nor density

Answer 176

Density only

Answer 177

Both pressure and density

Answer 178

5,000 to 11,000 Hz

Answer 179

2,000 to 4,000 Hz

Answer 180

3,000 to 6,000 Hz

Answer 181

4,000 to 8,000 Hz

Answer 182

√2 that of the individual waves

Answer 183

Same as that of the individual waves

Answer 184

Half that of the individual waves

Answer 185

Twice that of the individual waves

Answer 186

An apparent increase in frequency

Answer 187

No apparent change in frequency

Answer 188

An apparent decrease in frequency

Answer 189

An apparent decrease in wavelength

Answer 190

300 Nm¯¹

Answer 191

143 Nm¯¹

Answer 192

700 Nm¯¹

Answer 193

100 Nm¯¹

Answer 194

There is a loss of energy

Answer 195

The energy is redistributed and the distribution remains constant with time

Answer 196

The energy is redistributed and the distribution changes with time

Answer 197

There is a gain of energy

Answer 198

Rectilinear Motion

Answer 199

Simple Harmonic Motion

Answer 200

Angular Motion

Answer 201

Circular Motion

Answer 202

Becomes one half

Answer 203

Becomes double

Answer 204

Become one fourth

Answer 205

Remains same

Answer 206

Cannot be polarized

Answer 207

Do not affect photographic plate

Answer 208

Cannot be diffracted

Answer 209

Have a lower frequency

Answer 210

They are stationary waves

Answer 211

They do not have enough energy

Answer 212

They are transverse waves

Answer 213

They require material medium for propagation

Answer 214

The detector is in motion

Answer 215

Both the above

Answer 216

The source is in motion

Answer 217

None of these

Answer 218

Intensity of light

Answer 219

Sound loudness

Answer 220

Energy of radiation

Answer 221

x-ray radiation capacity

Answer 222

Driven harmonic oscillator

Answer 223

Vibration harmonic oscillator

Answer 224

Frequency harmonic oscillator

Answer 225

Remains unchanged

Answer 226

Becomes zero

Answer 227

None of these

Answer 228

Energy and linear momentum

Answer 229

Energy and mass

Answer 230

Energy, momentum and mass

Answer 231

Constructive interference

Answer 232

Destructive interference

Answer 233

Progressive waves

Answer 234

Mechanical waves

Answer 235

Periodic waves

Answer 236

None of these

Answer 237

None of these

Answer 238

Oscillation

Answer 239

None of these

Answer 240

Longitudinal waves

Answer 241

Progressive wave

Answer 242

Transverse wave

Answer 243

Displacement is maximum

Answer 244

Crossing mean position

Answer 245

Half way between them

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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Physics Waves Online Mcqs Test

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Important Waves Question and Answer

Physics Waves Practice Test Online With Explanation

Physics

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Malik Tahir

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