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

Longitudinal waves

Answer

Transverse wave

Answer

None of these

Answer

Progressive wave

Question 2

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

Question 3

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

Question 4

4. Sound waves in air always

Answer

Stationary

Answer

Transverse

Answer

Electromagnetic

Answer

Longitudinal

Question 5

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

Question 6

6. For production of beats the two sources must have

Answer

Different frequencies and same amplitude

Answer

Different frequencies and same phase

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies

Question 7

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

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Do not affect photographic plate

Answer

Have a lower frequency

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Cannot be polarized

Answer

Cannot be diffracted

Question 8

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

Question 9

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

Answer

Diffraction

Answer

Reflection

Answer

Refraction

Answer

Polarization

Question 10

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

Answer

6 times faster

Answer

√6 times slower

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At correct rate

Answer

√6 times faster

Question 11

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

Answer

2π second

Answer

4π second

Question 12

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

Question 13

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

Answer

Increased rapidly

Answer

None of these

Question 14

14. Velocity of sound in vacuum is

Question 15

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

Answer

None of these

Answer

Wavelength

Question 16

16. 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

700 Nm¯¹

Answer

100 Nm¯¹

Answer

300 Nm¯¹

Answer

143 Nm¯¹

Question 17

17. The restoring force of S.H.M. is maximum when particle:

Answer

Half way between them

Answer

Displacement is maximum

Answer

Crossing mean position

Question 18

18. 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 19

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

Answer

2,000 to 4,000 Hz

Answer

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Answer

3,000 to 6,000 Hz

Question 20

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

Answer

Beats phenomena

Answer

All of these

Answer

Doppler effect

Answer

Interference of waves

Question 21

21. The gases have a

Answer

None of these

Answer

Smaller elastic modules

Answer

Large elastic modulus

Answer

Zero elastic modulus

Question 22

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

Question 23

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

Question 24

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

Answer

Amplitude of motion will be very large

Answer

None of these

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be every small

Question 25

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

Answer

1214 ms¯¹

Answer

1343 ms¯¹

Answer

1483 ms¯¹

Answer

1567 ms¯¹

Question 26

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

Answer

Refraction

Answer

Interference

Answer

Reflection

Answer

Polarization

Question 27

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

Question 28

28. 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

Can penetrate the wall

Answer

Has a definite capacity

Answer

Has a definite quality

Answer

Has a definite pitch

Question 29

29. In simple harmonic motion,

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

Answer

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

Answer

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

Question 30

30. Energy is not carried by

Answer

Stationary waves

Answer

Transverse progressive waves

Answer

Electromagnetic waves

Answer

Longitudinal vibration

Question 31

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

Question 32

32. 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 33

33. The Doppler effect is produced if

Answer

The source is in motion

Answer

The detector is in motion

Answer

None of these

Answer

Both the above

Question 34

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

Answer

Double the mass

Answer

Reduce the mass to one fourth

Answer

Quadruple the mass

Answer

Half the mass

Question 35

35. Fidelity refers to

Answer

Reproduction of original image

Answer

Reproduction of a CD from original copy

Answer

Reproduction of music

Answer

Reproduction of original sound

Question 36

36. Beats are the results of

Answer

Polarization

Answer

Constrictive and destructive interference

Answer

Destructive interference

Answer

Diffraction of sound waves

Question 37

37. The distance between node and anti-node is

Question 38

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

Answer

Temperature of air

Answer

Moisture contents in air

Answer

The atmospheric pressure

Answer

The composition of air

Question 39

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

Answer

Doppler effect

Answer

Interference

Answer

Beat phenomenon

Question 40

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

Answer

Frequency and velocity

Answer

Intensity and velocity

Answer

Frequency and number of harmonic

Answer

Intensity and frequency

Question 41

41. A system under going force vibrations is known as

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Driven harmonic oscillator

Question 42

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

Answer

Wave length

Answer

Phase difference

Question 43

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

Answer

Transverse stationary

Answer

Longitudinal progressive

Answer

Transverse progressive

Answer

Longitudinal stationary

Question 44

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

Answer

Reverberation

Answer

Time period

Answer

Oscillation Time

Question 45

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

Answer

Angular Motion

Answer

Rectilinear Motion

Answer

Circular Motion

Answer

Simple Harmonic Motion

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. In vibratory motion which parameter remains constant?

Answer

K.E. Energy

Answer

Total Energy

Answer

Angular Momentum

Answer

P.E. Energy

Question 48

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

Question 49

49. 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 50

50. The speed of sound in a medium depends on

Answer

The inertia property but not on the elastic property

Answer

Neither the elastic property nor the inertia property

Answer

The elastic property as well as the inertia property

Answer

The elastic property but not on the inertia property

Question 51

51. 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 52

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

Answer

There is a gain of energy

Answer

The energy is redistributed and the distribution changes with time

Answer

The energy is redistributed and the distribution remains constant with time

Answer

There is a loss of energy

Question 53

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

Answer

Remains unchanged

Answer

Becomes zero

Question 54

54. 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 55

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

Answer

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

Answer

When v is zero, α is zero

Answer

When v is maximum, α is maximum

Answer

When v is maximum, α is zero

Question 56

56. What sort of waves exhibit the Doppler effect?

Answer

Sound waves

Answer

All of these

Answer

Water waves

Answer

Light waves

Question 57

57. The velocity of sound is greatest in

Question 58

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

Question 59

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

Answer

None of these

Answer

Zero in the mean position

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Maximum in the extreme position

Question 60

60. 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 increase

Answer

Time period will not change

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Time period will depend on the weight of the boy.

Question 61

61. 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

Extra supersonic speed

Answer

Supersonic speed

Question 62

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

Answer

Oscillation

Answer

None of these

Question 63

63. 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 64

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

Answer

Independent of x

Answer 165

Visible light

Answer 166

Gamma rays

Answer 167

Infra-red radiation

Answer 168

Ultra-violet rays

Answer 169

√2 that of the individual waves

Answer 170

Half that of the individual waves

Answer 171

Twice that of the individual waves

Answer 172

Same as that of the individual waves

Answer 173

Refraction

Answer 174

Interference

Answer 175

Polarization

Answer 176

Diffraction

Answer 177

Damping force is small

Answer 178

Restoring force is small

Answer 179

Quality factor is small

Answer 180

Applied periodic force is small

Answer 181

None of these

Answer 182

Sometimes in phase

Answer 183

Out of phase

Answer 184

Wave mechanics

Answer 185

Hyperbolic

Answer 186

Exponential

Answer 187

Logarithmic

Answer 188

Becomes one half

Answer 189

Becomes double

Answer 190

Become one fourth

Answer 191

Remains same

Answer 192

Amplitude and frequency of sound

Answer 193

Wavelength of sound

Answer 194

Density and elasticity of gas

Answer 195

Electromagnetic waves

Answer 196

Mechanical waves

Answer 197

Matter waves

Answer 198

Carrier waves

Answer 199

They are transverse waves

Answer 200

They are stationary waves

Answer 201

They require material medium for propagation

Answer 202

They do not have enough energy

Answer 203

Remains same

Answer 204

Increases or decreases depending on the material

Answer 205

x-ray radiation capacity

Answer 206

Energy of radiation

Answer 207

Sound loudness

Answer 208

Intensity of light

Answer 209

Remain unaffected

Answer 210

Become infinite

Answer 211

Energy is maximum at nodes and minimum at antidotes

Answer 212

Energy is minimum at nodes and maximum at antinodes

Answer 213

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 214

Energy is uniformly distributed

Answer 215

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 216

Energy is minimum at nodes and maximum at antidotes

Answer 217

Energy is uniformly distributed

Answer 218

Energy is minimum at nodes and maximum at antinodes

Answer 219

1/T seconds

Answer 220

1/f seconds

Answer 221

Remains constant

Answer 222

Becomes Zero

Answer 223

5α – 4β

Answer 224

9 (β – α)

Answer 225

5 β – 4 α

Answer 226

Periodic waves

Answer 227

Mechanical waves

Answer 228

None of these

Answer 229

Progressive waves

Answer 230

Energy, momentum and mass

Answer 231

Energy and mass

Answer 232

Energy and linear momentum

Answer 233

Constructive interference

Answer 234

Destructive interference

Answer 235

An apparent increase in frequency

Answer 236

An apparent decrease in frequency

Answer 237

No apparent change in frequency

Answer 238

An apparent decrease in wavelength

Answer 239

None of these

Answer 240

Density only

Answer 241

Neither pressure nor density

Answer 242

Pressure only

Answer 243

Both pressure and density

Answer 244

Become zero

Answer 245

Remains same

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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