Class 10 Physics Chapter 2
Updated: 17 Dec 2023
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Class 10 Physics Chapter 2 introduces the concept of “Sound”. This is mainly chapter No. 11, “Sound”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of Physics, which cover your course, board papers and clear your Physics concept for different types of tests.
Class 10 Physics Chapter 2 Notes
Sound
SLO Base Notes
Class 10 Physics Chapter 2 MCQs
1. The sensation felt by the human ear is called:(a) Vibration
(b) Sound
(c) Volume
(d) Acoustic sensation
Show Answer
Sound
2. What is the primary medium through which sound travels?
(a) Vacuum
(b) Solid
(c) Liquid
(d) Gas
Show Answer
Gas
3. Which type of waves do sound waves belong to?
(a) Transverse waves
(b) Electromagnetic waves
(c) Longitudinal waves
(d) Surface waves
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Longitudinal waves
4. How is a sound wave created?
(a) By light waves
(b) By a vibrating object
(c) By electric current
(d) By magnetic fields
Show Answer
By a vibrating object
5. What is a region of high molecular density and high air pressure called in a sound wave?
(a) Compression
(b) Rarefaction
(c) Refraction
(d) Diffraction
Show Answer
Compression
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6. What is a region of low molecular density and low air pressure called in a sound wave?(a) Compression
(b) Rarefaction
(c) Refraction
(d) Diffraction
Show Answer
Rarefaction
7. In what type of medium can sound be transmitted?
(a) Vacuum only
(b) Liquid only
(c) Solid only
(d) Gas, liquid, or solid
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Gas, liquid, or solid
8. Sound waves cannot travel through:
(a) Air
(b) Vacuum
(c) Water
(d) Glass
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Vacuum
9. In which medium does sound typically travel faster compared to the others?
(a) Air
(b) Water
(c) Solid
(d) Vacuum
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Solid
10. In which medium does sound typically travel slower compared to the others?
(a) Air
(b) Water
(c) Solid
(d) None of these
Show Answer
Air
11. What is the biological organ responsible for converting sound waves into the perception of hearing?
(a) Nose
(b) Eye
(c) Ear
(d) Tongue
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Ear
12. How do microphones detect sound?
(a) By converting it into light signals
(b) By converting it into mechanical energy
(c) By converting it into electrical signals
(d) By converting it into heat energy
Show Answer
By converting it into electrical signals
13. What is the term for the awareness of sound through the senses?
(a) Reflection
(b) Oscillation
(c) Acoustics
(d) Perception
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Perception
14. How do persons with hearing impairment detect sound?
(a) Through their ears
(b) By using artificial hearing devices
(c) By reading lips
(d) None of these
Show Answer
By using artificial hearing devices
15. What distinguishes between shrill and grave sound:
(a) Pitch
(b) Volume
(c) Loudness
(d) Quality
Show Answer
Pitch
16. The pitch of sound depends on:
(a) Amplitude of the sound wave
(b) Phase of the sound wave
(c) Frequency of the sound wave
(d) Speed of sound
Show Answer
Frequency of the sound wave
17. What will be the pitch of sound when the frequency is high:
(a) The pitch will be low
(b) The pitch will be moderate
(c) The pitch will be high
(d) The pitch will be unpredictable
Show Answer
The pitch will be high
18. What will be the pitch of sound when the frequency is low:
(a) The pitch will be low
(b) The pitch will be moderate
(c) The pitch will be high
(d) The pitch will be unpredictable
Show Answer
The pitch will be low
19. A high-pitched sound is called:
(a) Shrill sound
(b) Grave sound
(c) Loud sound
(d) None of these
Show Answer
Shrill sound
20. A low-pitched sound is called:
(a) Shrill sound
(b) Grave sound
(c) Loud sound
(d) None of these
Show Answer
Grave sound
21. Which of the following sounds is typically associated with a low pitch?
(a) Women singing
(b) Birds chirping
(c) Dogs barking
(d) Cats meowing
Show Answer
Dogs barking
22. Which of the following sounds is typically associated with a high pitch?
(a) Men singing
(b) Frogs croaking
(c) Lions roaring
(d) Birds chirping
Show Answer
Birds chirping
23. Pitch in sound can be compared to what property in light?
(a) Brightness
(b) Color
(c) Intensity
(d) Transparency
Show Answer
Color
24. What factor primarily determines the loudness of a sound?
(a) Frequency of the sound wave
(b) Speed of sound
(c) Amplitude of the sound wave
(d) Shape of the sound wave
Show Answer
Amplitude of the sound wave
25. How does the area of a vibrating body relate to the loudness of the sound it produces?
(a) Smaller area leads to louder sound
(b) Larger area leads to louder sound
(c) Area has no effect on loudness
(d) None of these
Show Answer
Larger area leads to louder sound
26. What effect does distance from the source of sound have on loudness?
(a) Closer distance leads to louder sound
(b) Farther distance leads to louder sound
(c) Distance has no effect on loudness
(d) None of these
Show Answer
Closer distance leads to louder sound
27. How does the material through which sound is traveling affect the amplitude of the sound wave?
(a) It does not affect the amplitude
(b) It decreases the amplitude in all materials
(c) Amplitude is different in different materials
(d) It increases the amplitude in all materials
Show Answer
Amplitude is different in different materials
28. The property of sound by which two sounds of the same loudness and pitch are distinguished from each other is called
(a) Loudness of sound
(b) Pitch of sound
(c) Amplitude of sound
(d) Quality of sound
Show Answer
Quality of sound
29. When comparing the sound from a piano and a flute, what distinguishes them?
(a) Loudness
(b) Pitch
(c) Quality or timbre
(d) Frequency
Show Answer
Quality or timbre
30. The measure of sound energy reaching an area in a unit time is called:
(a) Amplitude
(b) Frequency
(c) Intensity
(d) Loudness
Show Answer
Intensity
31. Intensity of sound is represented by:
(a) I
(b) L
(c) F
(d) P
Show Answer
I
32. What is the mathematical expression for the intensity of sound?
(a) I = \frac{E}{A}
(b) I = \frac{P}{A}
(c) I = \frac{A}{P}
(d) I = E \times A
Show Answer
I = \frac{P}{A}
33. What is the SI unit of intensity of sound?
(a) Hertz (Hz)
(b) Decibel (dB)
(c) Watt per square meter (W/m^2)
(d) Watt (W)
Show Answer
Watt per square meter (W/m^2)
34. 1 Pico watt per square meter is equal to:
(a) 1 \times 10^{3} W/m^2
(b) 1 \times 10^{-6} W/m^2
(c) 1 \times 10^{-12} W/m^2
(d) 1 \times 10^6 W/m^2
Show Answer
1 \times 10^{-12} W/m^2
35. What property of sound depends on the characteristics of a person’s ears?
(a) Intensity
(b) Loudness
(c) Frequency
(d) Amplitude
Show Answer
Loudness
36. Which of the following is an objective property of sound waves?
(a) Intensity
(b) Loudness
(c) Pitch
(d) Frequency
Show Answer
Intensity
37. The range of intensity that the average human ear can detect:
(a) 10^5 W/m^2 \ to \ 10^6 W/m^2
(b) 10^{-5} W/m^2 \ to \ 10^6 W/m^2
(c) 10^{-12} W/m^2 \ to \ 1 W/m^2
(d) 10^{-10} W/m^2 \ to \ 10^{-9} W/m^2
Show Answer
10^{-12} W/m^2 \ to \ 1 W/m^2
38. What is the difference between the loudness of two sounds represented by (L-L_o) ?
(a) Intensity level
(b) Decibel unit
(c) Sound frequency
(d) Sound wavelength
Show Answer
Intensity level
39. Intensity level is represented by:
(a) I
(b) L
(c) W
(d) \beta \ (beta)
Show Answer
\beta \ (beta)
40. What is the mathematical relationship between loudness (L) and sound intensity (I) in terms of the Bel unit?
(a) L = k \ \log (I)
(b) L = \log (I)
(c) L = \ log (kI)
(d) L = \frac{I}{k}
Show Answer
L = k \log (I)
41. If the intensity of a sound is ten times greater than the intensity of the faintest audible sound, what is the intensity level of that sound in Bels?
(a) 10 bels
(b) 1 bel
(c) 0.1 bel
(d) 100 bels
Show Answer
1 bel
42. How many decibels are in 1 bel?
(a) 10 decibels
(b) 100 decibels
(c) 0.1 decibels
(d) 1 decibel
Show Answer
10 decibels
43. What is the unit of intensity level used to quantify sound intensity differences?
(a) Hertz (Hz)
(b) Hertz (Hz)
(c) Watt (W)
(d) Decibel (dB)
Show Answer
Decibel (dB)
44. What is the intensity level (in decibels) of normal breathing?
(a) 10 dB
(b) 20 dB
(c) 30 dB
(d) 40 dB
Show Answer
10 dB
45. At what intensity level (in decibels) does a military jet take off?
(a) 110 dB
(b) 120 dB
(c) 130 dB
(d) 150 dB
Show Answer
150 dB
46. What is the threshold of pain in terms of intensity level (in decibels)?
(a) 140 dB
(b) 160 dB
(c) 170 dB
(d) 200 dB
Show Answer
140 dB
47. What does a 56.0 dB sound represent in terms of its intensity compared to a 53.0 dB sound?
(a) It is half as intense
(b) It is twice as intense
(c) It is one-tenth as intense
(d) It is ten times as intense
Show Answer
It is twice as intense
48. If a sound has an intensity level of 97.0 dB, how does its intensity compare to a 100 dB sound?
(a) It is half as intense
(b) It is twice as intense
(c) It is one-tenth as intense
(d) It is ten times as intense
Show Answer
It is half as intense
49. The intensity of a sound wave increases by 1000 \ W/m^2 . What is this increase equal to in decibels?
(a) 10 dB
(b) 20 dB
(c) 30 dB
(d) 40 dB
Show Answer
30 dB
50. What is the term for the distance covered by a sound wave in unit time?
(a) Wavelength
(b) Amplitude
(c) Frequency
(d) Speed
Show Answer
Speed
51. How is the speed of sound represented in equations?
(a) S
(b) V
(c) F
(d) L
Show Answer
V
52. What is the speed of sound in air at 20 {}^oC ?
(a) 343 \ m/s
(b) 5104 \ m/s
(c) 332 \ m/s
(d) 258 \ m/s
Show Answer
343 \ m/s
53. In which medium does sound travel most rapidly?
(a) Solid
(b) Liquid
(c) Gas
(d) All of these
Show Answer
Solid
54. In which medium does sound travel slowest?
(a) Solid
(b) Liquid
(c) Gas
(d) All of these
Show Answer
Gas
55. What is the speed of sound in aluminum?
(a) 5104 \ m/s
(b) 4110 \ m/s
(c) 1493 \ m/s
(d) 1270 \ m/s
Show Answer
5104 \ m/s
56. How many times is the speed of sound greater in water than in air?
(a) Twice
(b) Five times
(c) It’s the same
(d) It’s slower in water
Show Answer
Five times
57. What properties of air affect the speed of sound?
(a) Color and odor
(b) Altitude and pressure
(c) Temperature and compressibility
(d) Altitude and humidity
Show Answer
Temperature and compressibility
58. At a temperature of 0 {}^oC and a pressure of 101 \ kPa , what is the speed of sound in dry air?
(a) 0.6 \ m/s
(b) 331 \ m/s
(c) 343 \ m/s
(d) 101 \ m/s
Show Answer
331 \ m/s
59. How much does the speed of sound in air increase for each 1 {}^oC rise in temperature, approximately?
(a) 0.6 \ m/s
(b) 1 \ m/s
(c) 10 \ m/s
(d) 100 \ m/s
Show Answer
0.6 \ m/s
60. What happens to the speed of sound in air when the frequency of a sound wave is doubled?
(a) It decreases
(b) It increases
(c) It remains the same
(d) It becomes inaudible
Show Answer
It remains the same
61. What happens to the speed of sound in air when the wavelength of a sound wave is doubled?
(a) It decreases
(b) It increases
(c) It remains the same
(d) It becomes inaudible
Show Answer
It remains the same
62. If the temperature rises from 20 \ {}^oC \ to \ 30 {}^oC , approximately how much does the speed of sound in air change?
(a) It decreases by 6 m/s
(b) It increases by 6 m/s
(c) It remains the same
(d) It becomes zero
Show Answer
It increases by 6 m/s
63. What do we call the bouncing back of sound waves when they strike a surface?
(a) Absorption of sound
(b) Transmission of sound
(c) Reflection of sound
(d) Diffraction of sound
Show Answer
Reflection of sound
64. What is the term for sound due to multiple reflections in a small room?
(a) Refraction
(b) Echo
(c) Absorption
(d) Reverberation
Show Answer
Reverberation
65. What is the term for a reflected sound that can be distinguished from the original sound?
(a) Refraction
(b) Echo
(c) Absorption
(d) Reverberation
Show Answer
Echo
66. How long does it take for a reflected sound to be perceived as an echo by the human ear?
(a) 0.01 seconds
(b) 1 second
(c) 0.10 seconds
(d) 10 seconds
Show Answer
0.10 seconds
67. Besides the repetition of words, what can echoes are used to estimate?
(a) Temperature
(b) Distance of an object and velocity of sound
(c) Time of day
(d) Humidity
Show Answer
Distance of an object and velocity of sound
68. Minimum echo distance is reduced in _____________.
(a) Summer
(b) Spring
(c) Winter
(d) Space
Show Answer
Winter
69. If the speed of sound is 343 m/s and the sound reaches the ear in 0.15 seconds, what is the calculated distance to the source?
(a) 25.7 meters
(b) 51.75 meters
(c) 100 meters
(d) 343 meters
Show Answer
25.7 meters
70. What is acoustics the study of?
(a) Light and optics
(b) Waves, vibrations, and sound
(c) Geology and rocks
(d) Heat and thermodynamics
Show Answer
Waves, vibrations, and sound
71. How do rugs and furniture affect the acoustics of a room?
(a) They make the room sound dull
(b) They increase the sound level
(c) They create echoes
(d) They have no effect on acoustics
Show Answer
They make the room sound dull
72. What is the term for the balance between reverberation and absorption in room acoustics?
(a) Reflection
(b) Resonance
(c) Diffraction
(d) Architectural acoustics
Show Answer
Architectural acoustics
73. In architectural acoustics, what do parabolic surfaces do?
(a) Absorb sound
(b) Reflect sound
(c) Focus sound
(d) Disperse sound
Show Answer
Focus sound
74. What effect does a flat surface typically have on sound in architectural acoustics?
(a) Absorbs sound
(b) Reflects sound
(c) Focuses sound
(d) Scatters sound
Show Answer
Reflects sound
75. What is the primary characteristic of porous surfaces in acoustics?
(a) They absorb sound
(b) They reflect sound
(c) They focus sound
(d) They generate echoes
Show Answer
They absorb sound
76. How do jagged surfaces influence sound in architectural acoustics?
(a) They absorb sound
(b) They reflect sound
(c) They disperse sound
(d) They focus sound
Show Answer
They disperse sound
77. What is the primary purpose of acoustic protection?
(a) To enhance physical health
(b) To minimize stress levels
(c) To protect structures against vibrations
(d) To control noise during construction
Show Answer
To enhance physical health
78. Who, besides humans, can be affected by high noise and sound levels?
(a) Plants
(b) Insects
(c) Animals and birds
(d) Rocks and minerals
Show Answer
Animals and birds
79. Why might acoustic protection be required during construction and development activities?
(a) To increase noise levels
(b) To enhance structural stability
(c) To improve communication
(d) To control and reduce noise
Show Answer
To control and reduce noise
80. What is the term for excessive displeasing sound that disrupts the balance or activity of humans or other living things?
(a) Sound pollution
(b) Noise pollution
(c) Sonic disruption
(d) Acoustic imbalance
Show Answer
Noise pollution
81. At what sound level can prolonged exposure begin to damage hearing irreversibly?
(a) 60 dB
(b) 85 dB
(c) 100 dB
(d) 120 dB
Show Answer
85 dB
82. What sound level is capable of causing immediate damage?
(a) 60 dB
(b) 85 dB
(c) 100 dB
(d) 120 dB
Show Answer
120 dB
83. According to the World Health Organization, what is the recommended noise level during sleep to avoid disruption?
(a) 20 dB
(b) 35 dB
(c) 50 dB
(d) 75 dB
Show Answer
35 dB
84. Which classification of sound includes frequencies in the range of 20 Hz to 20,000 Hz?
(a) Ultrasonic
(b) Infrasonic
(c) Audible
(d) Supersonic
Show Answer
Audible
85. What is the upper limit of the audible frequency range for a healthy young person?
(a) 5,000 Hz
(b) 20,000 Hz
(c) 10,000 Hz
(d) 30,000 Hz
Show Answer
20,000 Hz
86. What is the term for sound frequencies lower than 20 Hz?
(a) Ultrasonic
(b) Infrasonic
(c) Audible
(d) Supersonic
Show Answer
Infrasonic
87. Which animals are known to use infra-sound for communication over long distances?
(a) Birds and dolphins
(b) Whales, elephants
(c) Tigers and lions
(d) Fish and frogs
Show Answer
Whales, elephants
88. What is the possible maximum range of communication for elephants using infra-sound?
(a) 1 km
(b) 5 km
(c) 10 km
(d) 20 km
Show Answer
10 km
89. What is the term for sound frequencies greater than 20 kHz?
(a) Ultrasonic
(b) Infrasonic
(c) Audible
(d) Supersonic
Show Answer
Ultrasonic
90. Which animals use ultrasonic ranging (echolocation) to detect their prey?
(a) Lions and tigers
(b) Bats and whales
(c) Eagles and hawks
(d) Frogs and turtles
Show Answer
Bats and whales
91. What is the frequency range of ultrasonic signals that bats can produce for echolocation?
(a) Up to 10 kHz
(b) Around 50 kHz
(c) Beyond 100 kHz, possibly up to 200 kHz
(d) Exactly 300 kHz
Show Answer
Beyond 100 kHz, possibly up to 200 kHz
92. What is the common use of ultrasonic sensors in automatic door openers?
(a) Measuring temperature
(b) Detecting intruders
(c) Playing music
(d) Lighting up the room
Show Answer
Detecting intruders
93. How is ultrasonic testing commonly used in nondestructive testing?
(a) To measure temperature
(b) To communicate underwater
(c) To find flaws in materials and measure thickness
(d) To diagnose medical conditions
Show Answer
To find flaws in materials and measure thickness
94. What does SONAR stand for?
(a) Sound Observation and Navigation Assistance Radar
(b) Sound Navigation and Ranging
(c) Sound Only for Navigational Accuracy and Range
(d) Sound Onboard Navigation and Radar
Show Answer
Sound Navigation and Ranging
95. What is responsible for most of the cleansing action in ultrasonic cleaners?
(a) High-pressure water jets
(b) Magnetic fields
(c) Cavitation
(d) Ultraviolet (UV) light
Show Answer
Cavitation
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