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

5 β – 4 α

Answer

5α – 4β

Answer

9 (β – α)

Question 2

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

Answer

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Answer

4,000 to 8,000 Hz

Answer

2,000 to 4,000 Hz

Question 3

3. Doppler-effect applies to

Answer

Light wave only

Answer

Neither sound nor light wave

Answer

Sound wave only

Answer

Both sound and light waves

Question 4

4. 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

Same as that of the individual waves

Answer

Half that of the individual waves

Question 5

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

Answer

Quality factor is small

Answer

Damping force is small

Answer

Applied periodic force is small

Answer

Restoring force is small

Question 6

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

Answer

Increased rapidly

Answer

None of these

Question 7

7. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

K.E. Energy

Answer

Total Energy

Answer

P.E. Energy

Question 8

8. A spring-mass system oscillates with a frequency v, if it is taken in an elevator slowly accelerating upward, the frequency will

Answer

Remains same

Answer

Become zero

Question 9

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

Question 10

10. 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 11

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

Answer

Polarization

Answer

Refraction

Answer

Diffraction

Answer

Interference

Question 12

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

Answer

No apparent change in frequency

Answer

An apparent decrease in wavelength

Answer

An apparent increase in frequency

Answer

An apparent decrease in frequency

Question 13

13. The velocity of sound is greatest in

Question 14

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

Answer

Oscillation

Answer

None of these

Question 15

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

Question 16

16. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Vibration harmonic oscillator

Answer

Frequency harmonic oscillator

Question 17

17. The velocity of sound in air depends upon

Answer

Wavelength of sound

Answer

Amplitude and frequency of sound

Answer

Density and elasticity of gas

Question 18

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

Question 19

19. 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 pitch

Answer

Has a definite capacity

Answer

Has a definite quality

Question 20

20. 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 21

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

Answer

Hyperbolic

Answer

Exponential

Answer

Logarithmic

Question 22

22. 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 23

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

Answer

Intensity and frequency

Answer

Frequency and velocity

Answer

Intensity and velocity

Answer

Frequency and number of harmonic

Question 24

24. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is uniformly distributed

Answer

Energy is maximum at nodes and minimum at antidotes

Question 25

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

Answer

Moisture contents in air

Answer

The composition of air

Answer

The atmospheric pressure

Answer

Temperature of air

Question 26

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 27

27. The distance between node and antinode is

Question 28

28. 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

143 Nm¯¹

Answer

300 Nm¯¹

Answer

100 Nm¯¹

Question 29

29. 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 30

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

Answer

Oscillation Time

Answer

Time period

Answer

Reverberation

Question 31

31. 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 32

32. The speed of sound in a medium depends on

Answer

The elastic property but not on the inertia property

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

Question 33

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

Answer

Do not affect photographic plate

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Cannot be diffracted

Question 34

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

Answer

Infra-red radiation

Answer

Gamma rays

Answer

Visible light

Answer

Ultra-violet rays

Question 35

35. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Diffraction of sound waves

Answer

Polarization

Answer

Destructive interference

Question 36

36. 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 37

37. Fidelity refers to

Answer

Reproduction of original sound

Answer

Reproduction of music

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original image

Question 38

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

Question 39

39. What sort of waves exhibit the Doppler effect?

Answer

Water waves

Answer

All of these

Answer

Sound waves

Answer

Light waves

Question 40

40. 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 41

41. The gases have a

Answer

Zero elastic modulus

Answer

Large elastic modulus

Answer

None of these

Answer

Smaller elastic modules

Question 42

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

Answer

Matter waves

Answer

Mechanical waves

Answer

Electromagnetic waves

Answer

Carrier waves

Question 43

43. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

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

Question 44

44. 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 depend on the weight of the boy.

Answer

Time period will not change

Answer

Time period will decrease

Answer

Time period will increase

Question 45

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

Answer

Becomes Zero

Answer

Remains constant

Question 46

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

Answer

1/f seconds

Answer

1/T seconds

Question 47

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

Answer

Wave mechanics

Question 48

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

Answer

Interference

Answer

Doppler effect

Answer

Beat phenomenon

Question 49

49. 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 50

50. An oscillating mass-spring system generates

Answer

Periodic waves

Answer

Progressive waves

Answer

Mechanical waves

Answer

None of these

Question 51

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

Question 52

52. 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 faster

Answer

√6 times slower

Answer

At correct rate

Question 53

53. Energy is not carried by

Answer

Longitudinal vibration

Answer

Transverse progressive waves

Answer

Stationary waves

Answer

Electromagnetic waves

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

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

Answer

When v is maximum, α is zero

Answer

When v is zero, α is zero

Question 55

55. 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 56

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

Answer

None of these

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be very large

Answer

Amplitude of motion will be every small

Question 57

57. 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

The energy is redistributed and the distribution remains constant with time

Answer

There is a loss of energy

Question 58

58. Silence zone takes place due to

Answer

Constructive interference

Answer

Destructive interference

Question 59

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

Answer

Becomes zero

Answer

Remains unchanged

Question 60

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

Answer

Zero in the mean position

Answer

None of these

Answer

Maximum in the extreme position

Question 61

61. 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 62

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

Answer

Phase difference

Answer

Wave length

Question 63

63. Decibel is unit of

Answer

Sound loudness

Answer

x-ray radiation capacity

Answer

Energy of radiation

Answer

Intensity of light

Question 64

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

Answer

Reduce the mass to one fourth

Answer

Half the mass

Answer

Quadruple the mass

Answer

Double the mass

Answer 173

The detector is in motion

Answer 174

The source is in motion

Answer 175

None of these

Answer 176

Both the above

Answer 177

A hyperbola

Answer 178

A straight line

Answer 179

An ellipse

Answer 180

Transverse

Answer 181

Longitudinal

Answer 182

Stationary

Answer 183

Electromagnetic

Answer 184

1567 ms¯¹

Answer 185

1483 ms¯¹

Answer 186

1214 ms¯¹

Answer 187

1343 ms¯¹

Answer 188

Rectilinear Motion

Answer 189

Angular Motion

Answer 190

Circular Motion

Answer 191

Simple Harmonic Motion

Answer 192

Doppler effect

Answer 193

Interference of waves

Answer 194

Beats phenomena

Answer 195

All of these

Answer 196

Longitudinal waves

Answer 197

Transverse wave

Answer 198

None of these

Answer 199

Progressive wave

Answer 200

Out of phase

Answer 201

None of these

Answer 202

Sometimes in phase

Answer 203

Neither pressure nor density

Answer 204

Pressure only

Answer 205

Both pressure and density

Answer 206

Density only

Answer 207

Energy and mass

Answer 208

Energy, momentum and mass

Answer 209

Energy and linear momentum

Answer 210

4π second

Answer 211

2π second

Answer 212

They are transverse waves

Answer 213

They require material medium for propagation

Answer 214

They do not have enough energy

Answer 215

They are stationary waves

Answer 216

None of these

Answer 217

Extra supersonic speed

Answer 218

None of these

Answer 219

Sonic speed

Answer 220

Supersonic speed

Answer 221

Half way between them

Answer 222

Crossing mean position

Answer 223

Displacement is maximum

Answer 224

Refraction

Answer 225

Diffraction

Answer 226

Reflection

Answer 227

Polarization

Answer 228

Independent of x

Answer 229

Becomes double

Answer 230

Becomes one half

Answer 231

Remains same

Answer 232

Become one fourth

Answer 233

Wavelength

Answer 234

None of these

Answer 235

√k₁k₂

Answer 236

(k₁+k₂)/2

Answer 237

k₁ k₂/( k₁+k₂)

Answer 238

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

Answer 239

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

Answer 240

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

Answer 241

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

Answer 242

Reflection

Answer 243

Interference

Answer 244

Polarization

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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