Physics Waves Online Mcqs Test

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Question 1

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

Answer

Transverse wave

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Progressive wave

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Longitudinal waves

Answer

None of these

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. Sound waves in air always

Answer

Transverse

Answer

Stationary

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Longitudinal

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Electromagnetic

Question 4

4. 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 5

5. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Periodic waves

Answer

None of these

Answer

Mechanical waves

Question 6

6. 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.

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Has a definite quality

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Has a definite capacity

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Has a definite pitch

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Can penetrate the wall

Question 7

7. What sort of waves exhibit the Doppler effect?

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Sound waves

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All of these

Answer

Water waves

Answer

Light waves

Question 8

8. Decibel is unit of

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Sound loudness

Answer

x-ray radiation capacity

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Intensity of light

Answer

Energy of radiation

Question 9

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

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Hyperbolic

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Logarithmic

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Exponential

Question 10

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

Question 11

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

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Becomes one half

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Become one fourth

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Becomes double

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Remains same

Question 12

12. Waves transmit _________ from one place to another

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None of these

Question 13

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

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(k₁+k₂)/2

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√k₁k₂

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k₁ k₂/( k₁+k₂)

Question 14

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

Question 15

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

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Reduce the mass to one fourth

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Double the mass

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Quadruple the mass

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Half the mass

Question 16

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

Question 17

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

Answer

Polarization

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Refraction

Answer

Interference

Answer

Reflection

Question 18

18. The gases have a

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Smaller elastic modules

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Large elastic modulus

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Zero elastic modulus

Answer

None of these

Question 19

19. A system under going force vibrations is known as

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Vibration harmonic oscillator

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Frequency harmonic oscillator

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Driven harmonic oscillator

Question 20

20. In stationary waves

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Energy is minimum at nodes and maximum at antidotes

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Energy is uniformly distributed

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Alternating maximum and minimum energy producing at nodes and antinodes

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Energy is minimum at nodes and maximum at antinodes

Question 21

21. In stationary waves

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Energy is maximum at nodes and minimum at antidotes

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Energy is minimum at nodes and maximum at antinodes

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Energy is uniformly distributed

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Alternating maximum and minimum energy producing at nodes and antinodes

Question 22

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

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Intensity and frequency

Answer

Frequency and number of harmonic

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Frequency and velocity

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Intensity and velocity

Question 23

23. 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 24

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

Question 25

25. The velocity of sound in air depends upon

Answer

Amplitude and frequency of sound

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Density and elasticity of gas

Answer

Wavelength of sound

Question 26

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

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Maximum in the extreme position

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Zero in the mean position

Answer

None of these

Question 27

27. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

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P.E. Energy

Answer

Angular Momentum

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Total Energy

Question 28

28. Sound waves do not travel in vacuum because

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They are stationary waves

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They are transverse waves

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They do not have enough energy

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They require material medium for propagation

Question 29

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

Answer

Wave mechanics

Question 30

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

Question 31

31. Silence zone takes place due to

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Destructive interference

Answer

Constructive interference

Question 32

32. 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 33

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

Answer

Interference

Answer

Beat phenomenon

Answer

Doppler effect

Question 34

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

Question 35

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

Answer

None of these

Answer

Wavelength

Question 36

36. Fidelity refers to

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Reproduction of original image

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Reproduction of original sound

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Reproduction of music

Answer

Reproduction of a CD from original copy

Question 37

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

Answer

Restoring force is small

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Applied periodic force is small

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Quality factor is small

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Damping force is small

Question 38

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

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Matter waves

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Electromagnetic waves

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Mechanical waves

Answer

Carrier waves

Question 39

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

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Remains unchanged

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Becomes zero

Question 40

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

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A straight line

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An ellipse

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A hyperbola

Question 41

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

Answer

2π second

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4π second

Question 42

42. 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

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Become infinite

Question 43

43. With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

Answer

Energy and linear momentum

Answer

Energy, momentum and mass

Answer

Energy and mass

Question 44

44. 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 45

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

Answer

At correct rate

Answer

6 times faster

Answer

√6 times slower

Answer

√6 times faster

Question 46

46. 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 47

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

Question 48

48. 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

5α – 4β

Answer

5 β – 4 α

Question 49

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

Question 50

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

Answer

None of these

Answer

Increased rapidly

Question 51

51. 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 52

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

Answer

Simple Harmonic Motion

Answer

Angular Motion

Answer

Circular Motion

Answer

Rectilinear Motion

Question 53

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

Answer

4,000 to 8,000 Hz

Answer

2,000 to 4,000 Hz

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Question 54

54. 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

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

Question 55

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

Answer

Doppler effect

Answer

Interference of waves

Answer

All of these

Answer

Beats phenomena

Question 56

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

Answer

Time period

Answer

Reverberation

Answer

Oscillation Time

Question 57

57. 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 58

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

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Cannot be diffracted

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Have a lower frequency

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Do not affect photographic plate

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Cannot be polarized

Question 59

59. 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 60

60. Velocity of sound in vacuum is

Question 61

61. 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

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

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

Question 62

62. Beats are the results of

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Constrictive and destructive interference

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Destructive interference

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Diffraction of sound waves

Answer

Polarization

Question 63

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

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Amplitude of motion will be every small

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Amplitude of motion will be very large

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None of these

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Independent of amplitude of motion

Question 64

64. The speed of sound in a medium depends on

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Neither the elastic property nor the inertia property

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The elastic property as well as the inertia property

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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

Answer 162

Longitudinal stationary

Answer 163

Longitudinal progressive

Answer 164

Transverse stationary

Answer 165

Transverse progressive

Answer 166

Gamma rays

Answer 167

Infra-red radiation

Answer 168

Ultra-violet rays

Answer 169

Visible light

Answer 170

The energy is redistributed and the distribution remains constant with time

Answer 171

There is a gain of energy

Answer 172

The energy is redistributed and the distribution changes with time

Answer 173

There is a loss of energy

Answer 174

Phase difference

Answer 175

Wave length

Answer 176

An apparent increase in frequency

Answer 177

No apparent change in frequency

Answer 178

An apparent decrease in wavelength

Answer 179

An apparent decrease in frequency

Answer 180

Oscillation

Answer 181

None of these

Answer 182

1/T seconds

Answer 183

1/f seconds

Answer 184

Remains same

Answer 185

Increases or decreases depending on the material

Answer 186

Density only

Answer 187

Pressure only

Answer 188

Neither pressure nor density

Answer 189

Both pressure and density

Answer 190

Transverse progressive waves

Answer 191

Stationary waves

Answer 192

Electromagnetic waves

Answer 193

Longitudinal vibration

Answer 194

Extra supersonic speed

Answer 195

Supersonic speed

Answer 196

None of these

Answer 197

Sonic speed

Answer 198

Different frequencies and same amplitude

Answer 199

Different frequencies

Answer 200

Different frequencies and same phase

Answer 201

Different frequencies, same amplitude and same phase

Answer 202

Diffraction

Answer 203

Polarization

Answer 204

Reflection

Answer 205

Refraction

Answer 206

Sound wave only

Answer 207

Light wave only

Answer 208

Both sound and light waves

Answer 209

Neither sound nor light wave

Answer 210

Becomes Zero

Answer 211

Remains constant

Answer 212

Polarization

Answer 213

Diffraction

Answer 214

Interference

Answer 215

Refraction

Answer 216

Time period will depend on the weight of the boy.

Answer 217

Time period will decrease

Answer 218

Time period will increase

Answer 219

Time period will not change

Answer 220

Independent of x

Answer 221

√2 that of the individual waves

Answer 222

Same as that of the individual waves

Answer 223

Half that of the individual waves

Answer 224

Twice that of the individual waves

Answer 225

1343 ms¯¹

Answer 226

1483 ms¯¹

Answer 227

1214 ms¯¹

Answer 228

1567 ms¯¹

Answer 229

None of these

Answer 230

Out of phase

Answer 231

Sometimes in phase

Answer 232

√k₁/k₂

Answer 233

√k₂/k₁

Answer 234

143 Nm¯¹

Answer 235

300 Nm¯¹

Answer 236

100 Nm¯¹

Answer 237

700 Nm¯¹

Answer 238

Temperature of air

Answer 239

The composition of air

Answer 240

The atmospheric pressure

Answer 241

Moisture contents in air

Answer 242

None of these

Answer 243

Both the above

Answer 244

The detector is in motion

Answer 245

The source is in motion

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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