Physics Mcqs For Class 11 with Answers PDF Download Chapter 08
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Chapter 8
Waves
Encircle the most appropriate answer among the following options
1. The mechanism in which energy is transferred from one place to another place is called choose which one is correct:
(a) Wave motion
(b) Wave
(c) Mechanical waves
(d) Sound waves
2. The particle of the medium vibrates in longitudinal waves choose which one is correct:
(a) Along the direction of wave motion
(b) Do not vibrate at all
(c) Opposite the direction of wave motion
(d) Perpendicular to the direction of wave motion
3. The waves which required certain medium for their propagation are called choose which one is correct:
(a) Matter waves
(b) Mechanical waves
(c) Water waves
(d) Wave motion
4. The waves which do not required any medium for their propagation are called choose which one is correct:
(a) Electromagnetic waves
(b) Light waves
(c) X-rays
(d) Radio waves
5. The waves associated with particles in motion are called choose which one is correct:
(a) Light waves
(b) Electronic waves
(c) Matter waves
(d) Light waves
6. Electrons moving with high velocities behave like choose which one is correct:
(a) Mechanical waves
(b) Electronic waves
(c) Matter waves
(d) Light waves
7. A mechanical wave is represented by choose which one is correct:
(a) Light
(b) Heat
(c) Compressional waves
(d) None of the above
8. A wave which transfer energy in moving from the source of disturbance is called choose which one is correct:
(a) Travelling waves
(b) Matter waves
(c) Water waves
(d) Radio waves
9. When the amplitude of the wave becomes double, its energy becomes choose which one is correct:
(a) Four times
(b) One half
(c) Double
(d) Nine times
10. The speed of waves can be found indirectly from its choose which one is correct:
(a) Frequency and time period
(b) Frequency and wavelength
(c) Wavelength and time period
(d) None of the above
11. Waves under ideal conditions may act as sources for transfer of choose which one is correct:
(a) Matter only
(b) Mass only
(c) Energy only
(d) Transfer both mass and energy
12. The wavelength, frequency and speed of any progressive waves are written as choose which one is correct:
(a) f =
(b) f =
(c) f = V x
(d) f = V +
13. The distance between two successive crests or troughs is called choose which one is correct:
(a) Area
(b) Displacement
(c) Amplitude
(d) Wavelength
14. The portion of the wave above the mean level is called choose which one is correct:
(a) Trough
(b) Crest
(c) Displacement
(d) Amplitude
15. The portion of the wave below the mean level is called choose which one is correct:
(a) Trough
(b) Crest
(c) Wavelength
(d) Amplitude
16. Crests and troughs are formed in choose which one is correct:
(a) Chemical waves
(b) Longitudinal waves
(c) Stationary waves
(d) Transverse waves
17. All parts of the wave pattern move with choose which one is correct:
(a) Same speed
(b) Different speed
(c) Double speed
(d) None of above
18. The expression v = f is valid for all types of choose which one is correct:
(a) Linear motion
(b) Angular motion
(c) Wave motion
(d) Circular motion
19. When a spring under tension is plucked one end at the wave formed as choose which one is correct:
(a) Transverse waves
(b) Square waves
(c) Longitudinal waves
(d) Compressed waves
20. Waves in which particles of the medium vibrate parallel to the direction of propagation are called choose which one is correct:
(a) Transverse waves
(b) Stationary waves
(c) Longitudinal waves
(d) Complex waves
21. Passage of waves from one medium into another is called choose which one is correct:
(a) Reflection
(b) Refraction
(c) Transmission
(d) Diffraction
22. If 30 waves per second pass through a medium at a speed of 30 m/s, wavelength of these waves is choose which one is correct:
(a) 30 m
(b) 15 m
(c) 1 m
(d) 280 m
23. Distance between two consecutive nodes is choose which one is correct:
(a)
(b)
(c)
(d)
24. The point at which the displacement of the wave is zero called choose which one is correct:
(a) Node
(b) Trough
(c) Anti-node
(d) Crest
25. The point at which the displacement of the wave is maximum called the choose which one is correct:
(a) Node
(b) Trough
(c) Anti-node
(d) Crest
26. When two identical waves are superposed, the velocity of the resultant wave choose which one is correct:
(a) Becomes zero
(b) Remains unchanged
(c) Increased
(d) Decreased
27. When two similar waves moving along the same line in opposite direction are superposed, they give rise to choose which one is correct:
(a) Stationary waves
(b) Longitudinal waves
(c) Compressed waves
(d) Travelling waves
28. The distance between two consecutive anti-node is choose which one is correct:
(a)
(b)
(c)
(d)
29. The stationary waves consists of choose which one is correct:
(a) Crest and troughs
(b) Nodes and anti-nodes
(c) Reflection & refraction
(d) None of these
30. Water waves are choose which one is correct:
(a) Stationary waves
(b) Longitudinal waves
(c) Electromagnetic waves
(d) Transverse waves
31. When a transverse wave is reflected on going from a denser to a rare medium, then choose which one is correct:
(a) There is a 1800 phase of shift
(b) There is no change in path
(c) A trough is converted into crest
(d) A crest is converted into a trough
32. When stationary waves are setup in a cord which is fixed at both ends, the points which always remain at rest is called choose which one is correct:
(a) Nodes
(b) Anti-nodes
(c) Both (a) & (b)
(d) None of these
33. Expression for Newton’s formula for speed of sound is choose which one is correct:
(a) V =
(b) V =
(c) V =
(d) V =
34. The speed of sound waves is independent of choose which one is correct:
(a) Pressure
(b) Source of sound
(c) Medium
(d) Temperature
35. The speed of sound in air proposed by Newton is choose which one is correct:
(a) 280 m/s
(b) 332 m/s
(c) 333 m/s
(d) None of the above
36. Newton’s formula for the speed of sound is corrected by choose which one is correct:
(a) Graham Bell
(b) Laplace
(c) Huygen
(d) Weber-Fechner
37. If E is the modulus of elasticity and p is the density then the speed of sound is choose which one is correct:
(a)
(b)
(c)
(d) V =
38. Laplace expression for the speed of sound in gas is choose which one is correct:
(a) V =
(b) V =
(c) V =
(d) V =
39. The velocity of sound in air at 00C is choose which one is correct:
(a) 332 m/s
(b) 300 m/s
(c) 322 m/s
(d) 280 m/s
40. Velocity of sound in vacuum is choose which one is correct:
(a) Zero
(b) 332 m/s
(c) 280 m/s
(d) 325 m/s
41. The speed of sound waves in a medium depends upon choose which one is correct:
(a) Density of medium
(b) Amplitude of the particle
(c) Elasticity of medium
(d) Both density and elasticity of medium
42 The velocity of sound is greatest in choose which one is correct:
(a) Steel
(b) Air
(c) Iron
(d) Water
43. An air column in a pipe, which is closed at one end, will be in resonance with a vibrating tuning fork of frequency 250 Hz. The length of the column in cm is (Velocity of sound in air = 340 ms-I choose right one
(a) 21.25
(b) 125
(c) 62.50
(d) 33.2
44. Stars moving towards the Earth show a choose which one is correct:
(a) Red shift
(b) Blue shift
(c) Yellow shift
(d) Green shift
45. Stationary waves only of discrete set of frequencies are set up in a medium. This fact is called choose which one is correct:
(a) Harmonics
(b) Overtones
(c) Quantization of frequencies
(d) Superposition of frequencies
46. Increase in velocity of sound in air for I oc rise in temperature is choose which one is correct:
(a) 0.61 m/s
(b) 61.0 m/s
(c) 1.61 m/s
(d) 2.00 m/s
47. The speed of sound is greater in solids than in gases due to their high choose which one is correct:
(a) Temperature
(b) Pressure
(c) Density
(d) Elasticity
48. Which of the following properties for sound is affected by change in air temperature choose which one is correct:
(a) Wavelength
(b) Intensity
(c) Amplitude
(d) Frequency
49. The superposition of a number of harmonic waves form choose which one is correct:
(a) Standing waves
(b) Complex waves
(c) Transverse waves
(d) Matter waves
50. At the closed end of an air column, node occurs choose which one is correct:
(a) Never
(b) Always
(c) In certain case
(d) None of these
51. Two waves having same frequency and traveling in the same direction is called choose which one is correct:
(a) Beats
(b) Interference
(c) Sound waves
(d) None of these
52. Two waves of different frequency and traveling in the same direction is called choose which one is correct:
(a) Interference
(b) Beats
(c) Stationary waves
(d) Sound waves
53. The interference in which the two waves are added up is called choose which one is correct:
(a) Interaction
(b) Constructive interference
(c) Destructive interference
(d) None of these
54. The interference of sound waves in which two waves cancel each other is called choose which one is correct:
(a) Interaction
(b) Consüuctive interference
(c) Destructive interference
(d) None of these
55. Two waves can interfere only if they have choose which one is correct:
(a) Different frequency
(b) Same velocity
(c) Propagation in opposite direction
(d) Phase coherence
56. Periodic alternation of sound between maximum and minimum loudness are called choose which one is correct:
(a) Diffraction
(b) Interference
(c) Beats
(d) None of these
57. Principle of superposition of waves is applied in choose which one is correct:
(a) Formation of beats
(b) Formation of stationary waves
(c) Interference of sound waves
(d) All of the above
58. Beats cannot be heard if the difference of frequencies is more than about choose which one is correct:
(a) 6
(b) 4
(c) 9
(d) 10
59. The system followed by Newton for the determination of speed of sound in air is choose which one is correct:
(a) Adiabatic
(b) Isothermal
(c) Isobaric
(d) Isochoric
60. A stretched string with both ends fixed corresponds to choose which one is correct:
(a) A closed end pipe
(b) An open-end organ pipe
(c) Both (a) & (b)
(d) None of these
61. With the rise of temperature, the velocity of sound is choose which one is correct:
(a) Increased
(b) Decreased
(c) Remains constant
(d) Becomes zero
62. The magnitude of auditory sensation produced by sound on the ear is known as choose which one is correct:
(a) Loudness
(b) Quality
(c) Intensity
(d) Frequency
63. The loudness of sound L is proportional to the logarithm of intensity 10 which is called choose which one is correct:
(a) Newton formula for sound
(b) Laplace formula for sound
(c) Weber-Fechner’s law
(d) None of these
64. The pitch of the sound is determined by its choose which one is correct:
(a) Speed
(b) Frequency
(c) Direction
(d) Number of beats
65. The amplitude of sound waves determined by its choose which one is correct:
(a) Speed
(b) Frequency
(c) Direction
(d) Number of beats
66. The amplitude of sound waves determines its choose which one is correct:
(a) Pitch
(b) Loudness
(c) Interference
(d) None of the above
67. What is the approximate range of audible frequencies for a young person choose which one is correct:
(a) 2 Hz to 2000 Hz
(b) 20 Hz to 2000 Hz
(c) 20 Hz to 20,000 Hz
(d) 200 Hz to 2 Hz
68. The unit of intensity level is choose which one is correct:
(a) Watt
(b) Joule
(c) Bel
(d) None of these
69. Sound of frequencies lower than 20 Hz are called choose which one is correct:
(a) Supersonics
(b) infrasonics
(c) Ultrasonics
(d) Audible sound waves
70. Beats are the result of choose which one is correct:
(a) Interference
(b) Diffraction of sound waves
(c) Polarization
(d) none
71. Musical sound depends upon choose which one is correct:
(a) Velocity
(b) Frequency
(c) Amplitude
(d) Periodicity and Regularity
72. Quality of sound depends upon its choose which one is correct:
(a) Amplitude
(b) Frequency
(c) Harmonics
(d) Intensity of sound
73. The pitch of sound depends upon choose which one is correct:
(a) Loudness of sound
(b) Wavelength of sound
(c) Intensity of sound
(d) Frequency of sound
74. Loudness of sound depends upon choose which one is correct:
(a) Frequency
(b) Pitch
(c) Intensity of sound & ear
(d) Ear alone
75. The number of beats produced per second is equal to choose which one is correct:
(a) The difference of frequencies of two tuning forks
(b) The sum of the frequencies of two tuning forks
(c) The ratio of the frequencies of two tuning forks
(d) None of these
76. Two tuning forks of frequencies 260 Hz and 257 Hz are sounded together, the number of beats per second is choose which one is correct:
(a) 3
(b) 4
(c) 2
(d) Zero
77. The apparent change in frequency as heard by an observer when there is relative motion between the source and observer is known as choose which one is correct:
(a) Compton effect
(b) Photo electric effect
(c) Doppler effect
(d) None of these
78. Radar system is the application of choose which one is correct:
(a) Photoelectric effect
(b) Doppler effect
(c) Compton effect
(d) None of these
79. Doppler’s effect applies to choose which one is correct:
(a) Light waves only
(b) Sound waves only
(c) Both sound and light waves
(d) None of these
80. When Doppler’s effect is applied to electromagnetic waves source approaching the observer at rest represents choose which one is correct:
(a) Identical situations
(b) Different situations
(c) No change
(d) None of these
81. When source of sound approaches the listener at rest, the frequency of sound received by him is choose which one is correct:
(a) Less than the frequency of sound produced by source
(b) Greater than the frequency of sound produced by source
(c) Same as that produced by source
(d) Zero
82. When the source of sound moves away from a stationary listener, then there is choose which one is correct:
(a) An apparent increase in frequency
(b) An apparent decrease in frequency
(c) An apparent decrease in wavelength
(d) No apparent change in frequency
83. It is possible to distinguish between transverse and longitudinal waves from the property of among one from following choose which one is correct:
(a) Refraction
(b) Interference
(c) Diffraction
(d) Polarization
84. The magnitude of auditory sensation produced by sound on the ear is known as choose which one is correct:
(a) Frequency
(b) Intensity
(c) Quality
(d) Loudness
85. A source of waves which gives out pure note means that it gives out choose which one is correct:
(a) Mixture of frequency
(b) Quantum frequencies
(c) Single frequency
(d) None of these
86. When the difference between the frequencies of two sounds is more than about . Then it becomes difficult to recognize beats choose which one is correct:
(a) 15 Hz
(b) 10 Hz
(c) 5 Hz
(d) 20 Hz
87. Dog hears sound which ranges choose which one is correct:
(a) 150 – 150000 Hz
(b) 100 – 12000 Hz
(c) 50 – 70000 Hz
(d) 150 – 150000 Hz
88. Cat hears sound which ranges choose which one is correct:
(a) 60 – 7000 Hz
(b) 60 – 70000 Hz
(c) 15 – 50000 Hz
(d) 15 – 150000 Hz
89. Speed of sound in hydrogen at 200C at STP is choose which one is correct:
(a) 332 m/s
(b) 280 m/s
(c) 258 m/s
(d) 333 m/s
90. Speed of sound in iron at 200C is choose which one is correct:
(a) 5130 m/s
(b) 5230 m/s
(c) 5030 m/s
(d) 3600 m/s
91. Velocity of sound in vacuum at O OC is choose which one is correct:
(a) 332 ms-1
(b) 320 ms.-1
(c) Zero
(d) 224 ms-1
92. The speed of sound in air at 300C is approximately equal to choose which one is correct:
(a) 333 m/s
(b) 350 m/s
(c) 340 m/s
(d) 335 m/s
93. The speed of sound in air at S.T.P is 300 ms-I . If the air pressure becomes double, the temperature remaining the same, the speed of sound would become choose which one is correct:
(a) 1200 ms-1
(b) 600 ms-1
(c) 300ms-1.
(d) 300 ms-1
94. If the number of loops of a stationary waves are increasing then choose which one is correct:
(a) Wavelengths gets higher
(b) Wavelengths gets shorter
(c) Wavelength becomes constant
(d) None of these
95. Newton calculated the velocity of sound in air at S.T.P equal to choose which one is correct:
(a) 280 ms-1
(b) 250 ms-1
(c) 300 ms-1
(d) 322 ms-1
96. The frequency of a stretched wire 1000 mm long is 256 Hz. When the wire is shortened to 400 mm at the same tension. What is the fundamental frequency choose which one is correct?
(a) 102 Hz
(b) 640 Hz
(c) 416 Hz
(d) 162 Hz
97. The quantities which together determine the speed of sound in a liquid are choose which one is correct:
(a) the bulk Modulus and the density
(b) the bulk Modulus and the pressure
(c) the Young Modulus and the volume
(d) the Young Modulus and the density
98. An organ pipe of effective length 0.68 m is closed at one end. Given that the speed of sound is 340 ms-I . The two lowest Resonant frequencies are choose which one is correct:
(a) 125 Hz and 250
(b) 125 Hz and 375 Hz
(c) 250 and 500
(d) 250 and 750 Hz
99. The temperature at which the speed of sound in air becomes double its value at O0C is choose which one is correct:
(a) 10920c
(b) 819 0 C
(c) 819 K
(d) 5460C
100. When temperature increases, frequency of organ pipe choose which one is correct:
(a) Decreases
(b) Increases
(c) Unchanged
(d) Becomes zero