Physics Waves Online Mcqs Test

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Question 1

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

Question 2

2. Energy is not carried by

Answer

Longitudinal vibration

Answer

Electromagnetic waves

Answer

Stationary waves

Answer

Transverse progressive waves

Question 3

3. What sort of waves exhibit the Doppler effect?

Answer

All of these

Answer

Light waves

Answer

Water waves

Answer

Sound waves

Question 4

4. 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 5

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

Answer

Refraction

Answer

Polarization

Answer

Reflection

Answer

Diffraction

Question 6

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

Answer

Electromagnetic waves

Answer

Mechanical waves

Answer

Matter waves

Answer

Carrier waves

Question 7

7. 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 8

8. 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 9

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

Answer

None of these

Answer

Wavelength

Question 10

10. The gases have a

Answer

Smaller elastic modules

Answer

None of these

Answer

Large elastic modulus

Answer

Zero elastic modulus

Question 11

11. In vibratory motion which parameter remains constant?

Answer

Angular Momentum

Answer

P.E. Energy

Answer

K.E. Energy

Answer

Total Energy

Question 12

12. Velocity of sound in vacuum is

Question 13

13. Sound waves in air always

Answer

Longitudinal

Answer

Electromagnetic

Answer

Stationary

Answer

Transverse

Question 14

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

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Do not affect photographic plate

Answer

Cannot be polarized

Question 15

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

Question 16

16. 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 slower

Answer

√6 times faster

Answer

6 times faster

Question 17

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

Answer

Oscillation Time

Answer

Reverberation

Answer

Time period

Question 18

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

Answer

Polarization

Answer

Diffraction

Answer

Refraction

Answer

Interference

Question 19

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

Question 20

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

Answer

None of these

Answer

Oscillation

Question 21

21. 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 22

22. 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

Answer

Time period will depend on the weight of the boy.

Question 23

23. 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 24

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

Question 25

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

Answer

Independent of amplitude of motion

Answer

Amplitude of motion will be very large

Answer

Amplitude of motion will be every small

Answer

None of these

Question 26

26. 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 27

27. The Doppler effect is produced if

Answer

The source is in motion

Answer

The detector is in motion

Answer

Both the above

Answer

None of these

Question 28

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

Answer

Double the mass

Answer

Half the mass

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Question 29

29. 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 zero

Answer

When v is maximum, α is maximum

Question 30

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

Question 31

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

Answer

Remains same

Answer

Increases or decreases depending on the material

Question 32

32. 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

3,000 to 6,000 Hz

Answer

5,000 to 11,000 Hz

Question 33

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

Question 34

34. An oscillating mass-spring system generates

Answer

Progressive waves

Answer

Periodic waves

Answer

Mechanical waves

Answer

None of these

Question 35

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

Answer

An apparent decrease in wavelength

Answer

No apparent change in frequency

Answer

An apparent decrease in frequency

Answer

An apparent increase in frequency

Question 36

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

Answer

1/T seconds

Answer

1/f seconds

Question 37

37. The speed of sound in a medium depends on

Answer

The elastic property as well as the inertia property

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

Question 38

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

Answer

Exponential

Answer

Hyperbolic

Answer

Logarithmic

Question 39

39. The distance between node and anti-node is

Question 40

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

Answer

Sometimes in phase

Answer

None of these

Answer

Out of phase

Question 41

41. Waves transmit _________ from one place to another

Answer

None of these

Question 42

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

Answer

Damping force is small

Answer

Quality factor is small

Answer

Restoring force is small

Answer

Applied periodic force is small

Question 43

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

Answer

Temperature of air

Answer

The atmospheric pressure

Answer

Moisture contents in air

Answer

The composition of air

Question 44

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

Answer

4π second

Answer

2π second

Question 45

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

Answer

1567 ms¯¹

Answer

1343 ms¯¹

Answer

1214 ms¯¹

Answer

1483 ms¯¹

Question 46

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

Answer

Increased rapidly

Answer

None of these

Question 47

47. 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

Answer

9 (β – α)

Answer

5 β – 4 α

Question 48

48. 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

143 Nm¯¹

Answer

100 Nm¯¹

Answer

300 Nm¯¹

Answer

700 Nm¯¹

Question 49

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

Answer

Frequency and velocity

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Question 50

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

Question 51

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

Answer

A straight line

Answer

A hyperbola

Answer

An ellipse

Question 52

52. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Answer

Energy is maximum at nodes and minimum at antidotes

Question 53

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

Answer

Zero in the mean position

Answer

Maximum in the extreme position

Answer

None of these

Question 54

54. 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 55

55. In simple harmonic motion,

Answer

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

Answer

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

Answer

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

Question 56

56. The velocity of sound is greatest in

Question 57

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

Answer

Progressive wave

Answer

Transverse wave

Answer

None of these

Answer

Longitudinal waves

Question 58

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

Answer

Become one fourth

Answer

Becomes double

Answer

Becomes one half

Answer

Remains same

Question 59

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

Answer

Remains unchanged

Answer

Becomes zero

Question 60

60. 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 61

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

Answer

√2 that of the individual waves

Answer

Twice that of the individual waves

Answer

Half that of the individual waves

Answer

Same as that of the individual waves

Question 62

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

Answer

There is a loss of energy

Answer

The energy is redistributed and the distribution remains constant with time

Answer

There is a gain of energy

Answer

The energy is redistributed and the distribution changes with time

Question 63

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

Question 64

64. Fidelity refers to

Answer

Reproduction of music

Answer

Reproduction of original image

Answer

Reproduction of a CD from original copy

Answer

Reproduction of original sound

Answer 171

Energy is minimum at nodes and maximum at antinodes

Answer 172

Alternating maximum and minimum energy producing at nodes and antinodes

Answer 173

Energy is minimum at nodes and maximum at antidotes

Answer 174

Energy is uniformly distributed

Answer 175

Wavelength of sound

Answer 176

Density and elasticity of gas

Answer 177

Amplitude and frequency of sound

Answer 178

Diffraction of sound waves

Answer 179

Constrictive and destructive interference

Answer 180

Polarization

Answer 181

Destructive interference

Answer 182

Crossing mean position

Answer 183

Half way between them

Answer 184

Displacement is maximum

Answer 185

Infra-red radiation

Answer 186

Visible light

Answer 187

Ultra-violet rays

Answer 188

Gamma rays

Answer 189

Different frequencies, same amplitude and same phase

Answer 190

Different frequencies and same amplitude

Answer 191

Different frequencies and same phase

Answer 192

Different frequencies

Answer 193

Constructive interference

Answer 194

Destructive interference

Answer 195

Wave mechanics

Answer 196

Energy of radiation

Answer 197

x-ray radiation capacity

Answer 198

Intensity of light

Answer 199

Sound loudness

Answer 200

Independent of x

Answer 201

Light wave only

Answer 202

Sound wave only

Answer 203

Both sound and light waves

Answer 204

Neither sound nor light wave

Answer 205

Beat phenomenon

Answer 206

Interference

Answer 207

Doppler effect

Answer 208

Polarization

Answer 209

Refraction

Answer 210

Interference

Answer 211

Reflection

Answer 212

Pressure only

Answer 213

Neither pressure nor density

Answer 214

Density only

Answer 215

Both pressure and density

Answer 216

None of these

Answer 217

Supersonic speed

Answer 218

Extra supersonic speed

Answer 219

Sonic speed

Answer 220

Transverse progressive

Answer 221

Longitudinal stationary

Answer 222

Transverse stationary

Answer 223

Longitudinal progressive

Answer 224

They are transverse waves

Answer 225

They are stationary waves

Answer 226

They do not have enough energy

Answer 227

They require material medium for propagation

Answer 228

Angular Motion

Answer 229

Circular Motion

Answer 230

Simple Harmonic Motion

Answer 231

Rectilinear Motion

Answer 232

Phase difference

Answer 233

Wave length

Answer 234

Energy and linear momentum

Answer 235

Energy, momentum and mass

Answer 236

Energy and mass

Answer 237

Beats phenomena

Answer 238

Doppler effect

Answer 239

Interference of waves

Answer 240

All of these

Answer 241

Vibration harmonic oscillator

Answer 242

Driven harmonic oscillator

Answer 243

Frequency harmonic oscillator

Answer 244

Remains constant

Answer 245

Becomes Zero

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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Key Preparation Tips:

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Malik Tahir

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