Physics Waves Online Mcqs Test

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Question 1

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

Answer

Wave length

Answer

Phase difference

Question 2

2. 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 quality

Answer

Has a definite pitch

Answer

Has a definite capacity

Question 3

3. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 4

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

Answer

Intensity and velocity

Answer

Frequency and velocity

Answer

Frequency and number of harmonic

Answer

Intensity and frequency

Question 5

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

Answer

Becomes zero

Answer

Remains unchanged

Question 6

6. Waves disturbances may also come in a concentrated bundles like stock waves from an airplane flying at:

Answer

None of these

Answer

Supersonic speed

Answer

Extra supersonic speed

Answer

Sonic speed

Question 7

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

Question 8

8. Doppler-effect applies to

Answer

Light wave only

Answer

Both sound and light waves

Answer

Neither sound nor light wave

Answer

Sound wave only

Question 9

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

Answer

The atmospheric pressure

Answer

Moisture contents in air

Answer

The composition of air

Answer

Temperature of air

Question 10

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

Answer

Amplitude of motion will be very large

Answer

Amplitude of motion will be every small

Answer

None of these

Answer

Independent of amplitude of motion

Question 11

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

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Interference

Answer

Diffraction

Answer

Polarization

Answer

Refraction

Question 12

12. Fidelity refers to

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Reproduction of music

Answer

Reproduction of a CD from original copy

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Reproduction of original image

Answer

Reproduction of original sound

Question 13

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

Answer

Progressive wave

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Transverse wave

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Longitudinal waves

Answer

None of these

Question 14

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

Answer

1/T seconds

Answer

1/f seconds

Question 15

15. 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

5,000 to 11,000 Hz

Answer

4,000 to 8,000 Hz

Question 16

16. 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 17

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

Answer

Doppler effect

Answer

Beats phenomena

Answer

All of these

Answer

Interference of waves

Question 18

18. The distance between node and antinode is

Question 19

19. 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 20

20. 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

When v is maximum, α is maximum

Answer

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

Question 21

21. 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 22

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

Answer

Longitudinal stationary

Answer

Longitudinal progressive

Answer

Transverse stationary

Answer

Transverse progressive

Question 23

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

Answer

None of these

Answer

Zero in the mean position

Answer

Maximum in the extreme position

Question 24

24. The distance between node and anti-node is

Question 25

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

Answer

Exponential

Answer

Hyperbolic

Answer

Logarithmic

Question 26

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

Answer

Cannot be polarized

Answer

Have a lower frequency

Answer

Do not affect photographic plate

Answer

Cannot be diffracted

Question 27

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

Question 28

28. 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 29

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

Answer

Oscillation

Answer

None of these

Question 30

30. 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

100 Nm¯¹

Answer

143 Nm¯¹

Answer

700 Nm¯¹

Answer

300 Nm¯¹

Question 31

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

Answer

Wave mechanics

Question 32

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 33

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

Answer

Electromagnetic waves

Answer

Carrier waves

Answer

Mechanical waves

Answer

Matter waves

Question 34

34. Beats are the results of

Answer

Destructive interference

Answer

Polarization

Answer

Diffraction of sound waves

Answer

Constrictive and destructive interference

Question 35

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

Question 36

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

Question 37

37. For production of beats the two sources must have

Answer

Different frequencies and same amplitude

Answer

Different frequencies, same amplitude and same phase

Answer

Different frequencies

Answer

Different frequencies and same phase

Question 38

38. 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 39

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

Question 40

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

Answer

None of these

Answer

Increased rapidly

Question 41

41. Sound waves in air always

Answer

Transverse

Answer

Stationary

Answer

Longitudinal

Answer

Electromagnetic

Question 42

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

Answer

Twice that of the individual waves

Answer

√2 that of the individual waves

Answer

Half that of the individual waves

Answer

Same as that of the individual waves

Question 43

43. 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 44

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

Answer

Displacement is maximum

Answer

Half way between them

Answer

Crossing mean position

Question 45

45. In simple harmonic motion,

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

Answer

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

Question 46

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

Answer

Refraction

Answer

Diffraction

Answer

Reflection

Answer

Polarization

Question 47

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

Question 48

48. 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 49

49. In stationary waves

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is uniformly distributed

Answer

Energy is minimum at nodes and maximum at antinodes

Question 50

50. Waves transmit _________ from one place to another

Answer

None of these

Question 51

51. The velocity of sound is greatest in

Question 52

52. The speed of sound in a medium depends on

Answer

The inertia property but not on the elastic property

Answer

The elastic property but not on the inertia property

Answer

The elastic property as well as the inertia property

Answer

Neither the elastic property nor the inertia property

Question 53

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

Answer

Time period

Answer

Reverberation

Answer

Oscillation Time

Question 54

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

Question 55

55. The gases have a

Answer

Zero elastic modulus

Answer

None of these

Answer

Smaller elastic modules

Answer

Large elastic modulus

Question 56

56. 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 57

57. 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)/2

Answer

√k₁k₂

Answer

k₁ k₂/( k₁+k₂)

Question 58

58. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Sound waves

Answer

Water waves

Answer

Light waves

Question 59

59. Sound waves do not travel in vacuum because

Answer

They do not have enough energy

Answer

They are transverse waves

Answer

They require material medium for propagation

Answer

They are stationary waves

Question 60

60. An oscillating mass-spring system generates

Answer

Mechanical waves

Answer

Progressive waves

Answer

Periodic waves

Answer

None of these

Question 61

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

Answer

Simple Harmonic Motion

Answer

Circular Motion

Answer

Rectilinear Motion

Answer

Angular Motion

Question 62

62. The velocity of sound in air depends upon

Answer

Amplitude and frequency of sound

Answer

Density and elasticity of gas

Answer

Wavelength of sound

Question 63

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

Question 64

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

Answer

Remains constant

Answer

Becomes Zero

Answer 169

Energy of radiation

Answer 170

x-ray radiation capacity

Answer 171

Intensity of light

Answer 172

Sound loudness

Answer 173

Remain unaffected

Answer 174

Become infinite

Answer 175

Destructive interference

Answer 176

Constructive interference

Answer 177

Independent of x

Answer 178

4π second

Answer 179

2π second

Answer 180

Energy is maximum at nodes and minimum at antidotes

Answer 181

Energy is uniformly distributed

Answer 182

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 183

Energy is minimum at nodes and maximum at antinodes

Answer 184

Electromagnetic waves

Answer 185

Longitudinal vibration

Answer 186

Stationary waves

Answer 187

Transverse progressive waves

Answer 188

No apparent change in frequency

Answer 189

An apparent decrease in wavelength

Answer 190

An apparent decrease in frequency

Answer 191

An apparent increase in frequency

Answer 192

None of these

Answer 193

The detector is in motion

Answer 194

The source is in motion

Answer 195

Both the above

Answer 196

None of these

Answer 197

Wavelength

Answer 198

1214 ms¯¹

Answer 199

1483 ms¯¹

Answer 200

1567 ms¯¹

Answer 201

1343 ms¯¹

Answer 202

Infra-red radiation

Answer 203

Gamma rays

Answer 204

Ultra-violet rays

Answer 205

Visible light

Answer 206

Sometimes in phase

Answer 207

Out of phase

Answer 208

None of these

Answer 209

Beat phenomenon

Answer 210

Interference

Answer 211

Doppler effect

Answer 212

A straight line

Answer 213

An ellipse

Answer 214

A hyperbola

Answer 215

Quality factor is small

Answer 216

Damping force is small

Answer 217

Restoring force is small

Answer 218

Applied periodic force is small

Answer 219

Becomes one half

Answer 220

Become one fourth

Answer 221

Remains same

Answer 222

Becomes double

Answer 223

Energy, momentum and mass

Answer 224

Energy and mass

Answer 225

Energy and linear momentum

Answer 226

Time period will decrease

Answer 227

Time period will increase

Answer 228

Time period will not change

Answer 229

Time period will depend on the weight of the boy.

Answer 230

Double the mass

Answer 231

Reduce the mass to one fourth

Answer 232

Half the mass

Answer 233

Quadruple the mass

Answer 234

Total Energy

Answer 235

Angular Momentum

Answer 236

K.E. Energy

Answer 237

P.E. Energy

Answer 238

Both pressure and density

Answer 239

Pressure only

Answer 240

Neither pressure nor density

Answer 241

Density only

Answer 242

Polarization

Answer 243

Interference

Answer 244

Reflection

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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