Physics Waves Online Mcqs Test

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Question 1

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

Answer

An apparent increase in frequency

Answer

An apparent decrease in wavelength

Answer

An apparent decrease in frequency

Answer

No apparent change in frequency

Question 2

2. 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

4,000 to 8,000 Hz

Answer

5,000 to 11,000 Hz

Question 3

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

Answer

√2 that of the individual waves

Answer

Half that of the individual waves

Answer

Same as that of the individual waves

Answer

Twice that of the individual waves

Question 4

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

Answer

None of these

Answer

Longitudinal waves

Answer

Transverse wave

Answer

Progressive wave

Question 5

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

Answer

Carrier waves

Answer

Electromagnetic waves

Answer

Mechanical waves

Answer

Matter waves

Question 6

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

Answer

Maximum in the extreme position

Answer

Zero in the mean position

Answer

None of these

Question 7

7. Velocity of sound in vacuum is

Question 8

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

Answer

4π second

Answer

2π second

Question 9

9. The distance between node and antinode is

Question 10

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

Answer

Becomes zero

Answer

Remains unchanged

Question 11

11. The Doppler effect is produced if

Answer

The detector is in motion

Answer

Both the above

Answer

The source is in motion

Answer

None of these

Question 12

12. 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 13

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

Answer

Do not affect photographic plate

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Cannot be polarized

Question 14

14. 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

k₁ k₂/( k₁+k₂)

Answer

√k₁k₂

Question 15

15. Decibel is unit of

Answer

Intensity of light

Answer

Energy of radiation

Answer

x-ray radiation capacity

Answer

Sound loudness

Question 16

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

Answer

Diffraction

Answer

Refraction

Answer

Polarization

Answer

Interference

Question 17

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

Answer

Extra supersonic speed

Answer

None of these

Answer

Sonic speed

Answer

Supersonic speed

Question 18

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

Answer

Out of phase

Answer

None of these

Answer

Sometimes in phase

Question 19

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

Answer

Interference

Answer

Refraction

Answer

Polarization

Answer

Reflection

Question 20

20. Energy is not carried by

Answer

Transverse progressive waves

Answer

Longitudinal vibration

Answer

Electromagnetic waves

Answer

Stationary waves

Question 21

21. 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 not change

Answer

Time period will increase

Answer

Time period will depend on the weight of the boy.

Answer

Time period will decrease

Question 22

22. 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

Has a definite capacity

Answer

Has a definite pitch

Answer

Can penetrate the wall

Answer

Has a definite quality

Question 23

23. The gases have a

Answer

Smaller elastic modules

Answer

Zero elastic modulus

Answer

None of these

Answer

Large elastic modulus

Question 24

24. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is uniformly distributed

Answer

Energy is maximum at nodes and minimum at antidotes

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 25

25. A system under going force vibrations is known as

Answer

Driven harmonic oscillator

Answer

Frequency harmonic oscillator

Answer

Vibration harmonic oscillator

Question 26

26. Beats are the results of

Answer

Constrictive and destructive interference

Answer

Polarization

Answer

Destructive interference

Answer

Diffraction of sound waves

Question 27

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

Answer

Amplitude of motion will be every small

Answer

Amplitude of motion will be very large

Answer

Independent of amplitude of motion

Answer

None of these

Question 28

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

Answer

1214 ms¯¹

Answer

1567 ms¯¹

Answer

1483 ms¯¹

Answer

1343 ms¯¹

Question 29

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

Answer

Damping force is small

Answer

Quality factor is small

Answer

Applied periodic force is small

Answer

Restoring force is small

Question 30

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

Question 31

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

Question 32

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

Answer

A hyperbola

Answer

An ellipse

Answer

A straight line

Question 33

33. 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 and mass

Answer

Energy, momentum and mass

Question 34

34. 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 35

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

Question 36

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

Question 37

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

Answer

Half way between them

Answer

Crossing mean position

Answer

Displacement is maximum

Question 38

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

Question 39

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

Answer

None of these

Answer

Wavelength

Question 40

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

Answer

Intensity and velocity

Answer

Intensity and frequency

Answer

Frequency and number of harmonic

Answer

Frequency and velocity

Question 41

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

Answer

Phase difference

Answer

Wave length

Question 42

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

Answer

Diffraction

Answer

Refraction

Answer

Reflection

Answer

Polarization

Question 43

43. 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 44

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

Answer

Double the mass

Answer

Quadruple the mass

Answer

Reduce the mass to one fourth

Answer

Half the mass

Question 45

45. 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 46

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

Answer

Gamma rays

Answer

Infra-red radiation

Answer

Visible light

Answer

Ultra-violet rays

Question 47

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

Answer

Become one fourth

Answer

Remains same

Answer

Becomes one half

Answer

Becomes double

Question 48

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

Answer

Temperature of air

Answer

The composition of air

Answer

The atmospheric pressure

Answer

Moisture contents in air

Question 49

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

Answer

Doppler effect

Answer

Interference

Answer

Beat phenomenon

Question 50

50. Sound waves do not travel in vacuum because

Answer

They require material medium for propagation

Answer

They are transverse waves

Answer

They are stationary waves

Answer

They do not have enough energy

Question 51

51. Sound waves in air always

Answer

Electromagnetic

Answer

Stationary

Answer

Longitudinal

Answer

Transverse

Question 52

52. The velocity of sound is greatest in

Question 53

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

Answer

All of these

Answer

Beats phenomena

Answer

Interference of waves

Answer

Doppler effect

Question 54

54. An oscillating mass-spring system generates

Answer

None of these

Answer

Progressive waves

Answer

Mechanical waves

Answer

Periodic waves

Question 55

55. In stationary waves

Answer

Energy is minimum at nodes and maximum at antinodes

Answer

Energy is minimum at nodes and maximum at antidotes

Answer

Energy is uniformly distributed

Answer

Alternating maximum and minimum energy producing at nodes and antinodes

Question 56

56. 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 57

57. 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 58

58. The velocity of sound in air depends upon

Answer

Density and elasticity of gas

Answer

Amplitude and frequency of sound

Answer

Wavelength of sound

Question 59

59. 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 60

60. Waves transmit _________ from one place to another

Answer

None of these

Question 61

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

Question 62

62. 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 63

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

Answer

None of these

Answer

Increased rapidly

Question 64

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

Answer 179

Circular Motion

Answer 180

Simple Harmonic Motion

Answer 181

Rectilinear Motion

Answer 182

Angular Motion

Answer 183

Becomes Zero

Answer 184

Remains constant

Answer 185

Different frequencies, same amplitude and same phase

Answer 186

Different frequencies and same amplitude

Answer 187

Different frequencies

Answer 188

Different frequencies and same phase

Answer 189

1/T seconds

Answer 190

1/f seconds

Answer 191

Reproduction of original image

Answer 192

Reproduction of a CD from original copy

Answer 193

Reproduction of original sound

Answer 194

Reproduction of music

Answer 195

Exponential

Answer 196

Logarithmic

Answer 197

Hyperbolic

Answer 198

√k₂/k₁

Answer 199

√k₁/k₂

Answer 200

700 Nm¯¹

Answer 201

100 Nm¯¹

Answer 202

143 Nm¯¹

Answer 203

300 Nm¯¹

Answer 204

Sound wave only

Answer 205

Neither sound nor light wave

Answer 206

Light wave only

Answer 207

Both sound and light waves

Answer 208

Wave mechanics

Answer 209

Reverberation

Answer 210

Oscillation Time

Answer 211

Time period

Answer 212

There is a gain of energy

Answer 213

The energy is redistributed and the distribution changes with time

Answer 214

There is a loss of energy

Answer 215

The energy is redistributed and the distribution remains constant with time

Answer 216

√6 times slower

Answer 217

At correct rate

Answer 218

6 times faster

Answer 219

√6 times faster

Answer 220

5 β – 4 α

Answer 221

5α – 4β

Answer 222

9 (β – α)

Answer 223

Water waves

Answer 224

Light waves

Answer 225

All of these

Answer 226

Sound waves

Answer 227

Both pressure and density

Answer 228

Density only

Answer 229

Neither pressure nor density

Answer 230

Pressure only

Answer 231

Longitudinal stationary

Answer 232

Transverse stationary

Answer 233

Longitudinal progressive

Answer 234

Transverse progressive

Answer 235

Remains same

Answer 236

Increases or decreases depending on the material

Answer 237

P.E. Energy

Answer 238

K.E. Energy

Answer 239

Angular Momentum

Answer 240

Total Energy

Answer 241

Independent of x

Answer 242

None of these

Answer 243

Oscillation

Answer 244

Constructive interference

Answer 245

Destructive interference

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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