Class 8 Science Chapter 10 Sound

Chapter 10 of Class 8 Science, titled "Sound," introduces students to the fascinating world of sound and its properties. The chapter explains how sound is produced, transmitted, and received, focusing on the role of vibrations in creating sound waves. Students will learn about the different mediums through which sound travels, such as solids, liquids, and gases, and how sound requires a medium to propagate. The concept of the speed of sound and factors that affect it, like temperature and medium, are also discussed. Furthermore, the chapter covers the structure of the human ear, how we perceive sound, and the importance of sound in communication. Additionally, students will explore topics like the range of hearing, the pitch and loudness of sound, and the effects of noise pollution. The quiz based on this chapter will test students' understanding of sound waves, the science behind how we hear, and the various applications and implications of sound in our daily lives. By the end of this chapter, students will have a clearer understanding of how sound influences the world around them.

1 / 100

Category: Introduction to Sound

1. A sound with a frequency of 200 Hz and another sound with a frequency of 400 Hz are produced. Which of the following statements is correct?

a. Both sounds have the same pitch.

b. The sound with 200 Hz has a higher pitch.

c. The sound with 400 Hz has a higher pitch.

d. Pitch is independent of frequency.

2 / 100

Category: Role of sound in daily life

2. A sound wave has a frequency of 500 Hz and a wavelength of 0.68 meters. What is the speed of the sound wave?

a. 320 m/s

b. 330 m/s

c. 340 m/s

d. 350 m/s

3 / 100

Category: Examples of sound perception

3. How does sound help in communication during a school period change?

a. By emitting light signals

b. Through written messages on the board

c. By creating vibrations that are felt

d. By producing audible signals like bells

4 / 100

Category: Basic questions about sound production and travel

4. Through which medium can sound NOT travel?

a. Air

b. Water

c. Vacuum

d. Solid wood

5 / 100

Category: Sound is Produced by a Vibrating Body

5. (A) When a rubber band is plucked, it produces sound.
(R) Sound is produced due to the vibrations of the rubber band.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

6 / 100

Category: Definition of Vibration: To and fro motion of an object

6. (A) When a rubber band is plucked, it produces sound.
(R) The to and fro motion of the rubber band when plucked causes vibrations that produce sound.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

7 / 100

Category: Experiments Demonstrating Vibrations

7. A rubber band is stretched around a pencil box and plucked in the middle. What do you observe, and what does it indicate about sound production?

a. The rubber band heats up and produces a high-pitched sound

b. The rubber band vibrates and produces sound

c. The rubber band stretches further without vibrating

d. The rubber band breaks, producing a loud noise

8 / 100

Category: Striking a metal plate

8. Why can't we always see the vibrations of an object producing sound?

a. The vibrations are too fast to be seen

b. The amplitude of vibrations is too small

c. The object does not vibrate at all

d. The vibrations are masked by other sounds

9 / 100

Category: Plucking a rubber band

9. (A) Plucking a rubber band produces sound because it vibrates.
(R) Vibration is the to and fro or back and forth motion of an object.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

10 / 100

Category: Water vibrations in a dish

10. What happens to the vibrations of the dish when you hold it after striking?

a. The vibrations increase

b. The vibrations continue unchanged

c. The vibrations stop

d. The dish breaks

11 / 100

Category: Musical Instruments and Vibrations

11. What happens when a rubber band is plucked?

a. It breaks

b. It expands

c. It vibrates

d. It contracts

12 / 100

Category: String instruments (e.g., Veena, Sitar)

12. Which of the following produces sound due to vibrations?

a. Stretched rubber band

b. Metal plate

c. Both stretched rubber band and metal plate

d. Neither stretched rubber band nor metal plate

13 / 100

Category: Membrane instruments (e.g., Tabla, Dholak)

13. (A) The sound produced by a tabla is due to the vibrations of its stretched membrane.
(R) The stretched membrane of a tabla vibrates when struck, producing sound waves.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

14 / 100

Category: Percussion instruments (e.g., Ghatam, Manjira)

14. When a Ghatam is struck, what happens to the air molecules around it?

a. The air molecules remain stationary

b. The air molecules vibrate and produce sound

c. The air molecules move away from the Ghatam

d. The air molecules condense into droplets

15 / 100

Category: Sound Produced by Humans

15. Why do men, women, and children have different voices?

a. Difference in lung capacity

b. Difference in vocal cord length

c. Difference in throat size

d. Difference in breathing patterns

16 / 100

Category: Voice Box (Larynx)

16. A person speaks loudly for a prolonged period. Which of the following changes is most likely to occur in their vocal cords during this process?

a. The vocal cords become thicker and looser

b. The vocal cords become tighter and thinner

c. The vocal cords remain unchanged in thickness

d. The vocal cords vibrate at a lower frequency

17 / 100

Category: Location and function

17. (A) The voice box in humans is located at the upper end of the windpipe.
(R) The vocal cords vibrate when air passes through them, producing sound.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

18 / 100

Category: Role of vocal cords in sound production

18. Why do men, women, and children have different voices?

a. Men have more muscles attached to their vocal cords than women and children.

b. Women and children have longer vocal cords compared to men.

c. The length of the vocal cords differs, with men having longer cords than women and children.

d. Children have the longest vocal cords, resulting in higher-pitched voices.

19 / 100

Category: Variation in Voice

19. (A) The pitch of the sound produced by vocal cords is higher in women than in men.
(R) The length of the vocal cords in women is shorter than in men.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

20 / 100

Category: Differences in men, women, and children’s voices

20. Where is the larynx located in the human body?

a. At the base of the lungs

b. At the upper end of the windpipe

c. In the nasal cavity

d. Near the diaphragm

21 / 100

Category: Role of vocal cord length in pitch

21. Which of the following groups typically has the shortest vocal cords?

a. Men

b. Women

c. Children

d. Adolescents

22 / 100

Category: Sound Needs a Medium for Propagation

22. Which of the following statements is true regarding the propagation of sound?

a. Sound can travel through a vacuum.

b. Sound travels faster in liquids than in solids.

c. Sound cannot travel through solids.

d. Sound requires a medium to propagate.

23 / 100

Category: Experiments on Medium Requirement

23. Why does the sound become fainter when you suck air out of the tumbler during the experiment with a cell phone?

a. The sound waves are absorbed by the hands surrounding the tumbler

b. The frequency of the sound changes as air is removed

c. The amount of air available for sound propagation decreases

d. The cell phone stops producing sound when air is removed

24 / 100

Category: Sound in air (Tumbler and cellphone experiment)

24. If you were to repeat the tumbler and cellphone experiment in outer space where there is a vacuum, what would you observe?

a. The sound would be louder than on Earth.

b. The sound would travel faster due to the vacuum.

c. No sound would be heard as there is no medium.

d. The sound would echo indefinitely in space.

25 / 100

Category: Sound in liquids (Water bucket and bell experiment)

25. Which of the following statements is true based on the water bucket and bell experiment?

a. Sound cannot travel through any medium

b. Sound can travel through liquids but not through solids

c. Sound cannot travel through water

d. Sound requires a medium and can travel through liquids

26 / 100

Category: Sound in solids (Metal rod experiment)

26. In an experiment, sound travels through a solid medium. Which of the following factors does NOT affect the speed of sound in this medium?

a. Elasticity of the material

b. Density of the material

c. Length of the solid medium

d. Temperature of the environment

27 / 100

Category: Propagation of Sound in Different Media

27. (A) Sound cannot travel through a vacuum.
(R) A vacuum lacks the medium required for sound propagation.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

28 / 100

Category: Gases: Air as a medium

28. (A) Sound cannot travel through a vacuum because there is no medium to carry the vibrations.
(R) A vacuum is a space devoid of any matter, including air, which is necessary for sound propagation.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

29 / 100

Category: Gases: Air as a medium

29. Which of the following is necessary for sound to propagate?

a. Vacuum

b. Air

c. Water

d. Solids

30 / 100

Category: Liquids: Sound transmission underwater

30. (A) Sound can travel through water.
(R) Water is a liquid medium, and sound requires a medium (gas, liquid, or solid) to propagate.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

31 / 100

Category: Liquids: Sound transmission underwater

31. Why do whales and dolphins communicate effectively underwater?

a. Water amplifies sound waves

b. Sound travels faster in water than in air

c. Water absorbs sound waves

d. Sound does not travel in water

32 / 100

Category: Solids: Sound traveling through metal/wood

32. Which of the following statements is true regarding sound propagation through different media?

a. Sound travels fastest in gases.

b. Sound cannot travel through liquids.

c. Sound travels fastest in solids.

d. Sound travels equally fast in all media.

33 / 100

Category: Solids: Sound traveling through metal/wood

33. (A) Sound can travel through a metal rod.
(R) Sound requires a medium to propagate, and solids like metal provide a medium for sound to travel.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

34 / 100

Category: Concept of Vacuum

34. A student observes that a tuning fork placed on a table can be heard clearly even when it is struck softly. However, when placed in a jar from which the air has been removed, the tuning fork cannot be heard. Which of the following best explains this observation?

a. The table amplifies sound waves better than air.

b. The tuning fork vibrates differently in different environments.

c. Sound waves require a medium to propagate, which is absent in the jar.

d. The jar absorbs sound waves more effectively than the table.

35 / 100

Category: Concept of Vacuum

35. (A) Sound cannot travel through a vacuum.
(R) A vacuum is a space devoid of any medium, and sound requires a medium to propagate.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

36 / 100

Category: Sound cannot travel through a vacuum (e.g., space)

36. (A) Sound cannot travel through a vacuum.
(R) A vacuum lacks a medium for sound propagation.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

37 / 100

Category: Sound cannot travel through a vacuum (e.g., space)

37. Sound cannot travel through which of the following?

a. Solid

b. Liquid

c. Gas

d. Vacuum

38 / 100

Category: We Hear Sound through Our Ears

38. (A) The eardrum vibrates when sound waves enter the ear.
(R) The eardrum sends vibrations to the inner ear, which then transmits the signal to the brain.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

39 / 100

Category: We Hear Sound through Our Ears

39. What is the most likely consequence of inserting a sharp object into the ear?

a. Enhanced hearing sensitivity due to increased vibrations.

b. Temporary ringing in the ears but no permanent damage.

c. Permanent hearing impairment due to eardrum damage.

d. Improved ability to hear high-frequency sounds.

40 / 100

Category: Structure of the Human Ear

40. In the human ear, how does the eardrum contribute to the process of hearing after receiving sound vibrations?

a. It converts sound directly into electrical signals

b. It amplifies the sound vibrations before sending them to the brain

c. It sends vibrations to the inner ear, which then sends signals to the brain

d. It filters out unnecessary sounds before transmission

41 / 100

Category: Structure of the Human Ear

41. What is the potential consequence of damaging the eardrum with a sharp or hard object?

a. Temporary pain but no long-term effects

b. Enhanced ability to hear high-pitched sounds

c. Permanent hearing impairment

d. Increased sensitivity to loud sounds

42 / 100

Category: Outer ear: Funnel-like structure

42. What is the shape of the outer part of the ear?

a. Circular

b. Oval

c. Funnel-like

d. Rectangular

43 / 100

Category: Outer ear: Funnel-like structure

43. What happens to the eardrum when sound waves reach it?

a. It remains still

b. It vibrates

c. It breaks

d. It expands

44 / 100

Category: Middle ear: Eardrum (tympanic membrane)

44. (A) The eardrum vibrates when sound waves enter the ear.
(R) The eardrum is a thin, stretched membrane that senses sound vibrations and sends signals to the brain.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

45 / 100

Category: Middle ear: Eardrum (tympanic membrane)

45. How does the eardrum contribute to the process of hearing?

a. By producing sound waves

b. By converting sound waves into electrical signals

c. By transmitting vibrations to the inner ear

d. By amplifying sound waves

46 / 100

Category: Inner ear: Nerve signals to the brain

46. What is the primary function of the inner ear in the process of hearing?

a. To amplify sound vibrations

b. To convert sound vibrations into nerve signals

c. To block unnecessary sounds

d. To store sound temporarily

47 / 100

Category: Inner ear: Nerve signals to the brain

47. What is the function of the eardrum in the process of hearing?

a. Transmits light signals

b. Filters air entering the ear

c. Senses sound vibrations and sends signals to the brain

d. Produces sound waves

48 / 100

Category: Experiment on Eardrum Sensitivity

48. Why do grains placed on a stretched rubber sheet jump up and down when sound is produced near it?

a. Because the rubber sheet absorbs the sound

b. Because the rubber sheet vibrates due to sound

c. Because the grains are attracted to sound

d. Because the rubber sheet stretches further

49 / 100

Category: Experiment on Eardrum Sensitivity

49. (A) The eardrum is essential for hearing because it converts sound vibrations into mechanical vibrations.
(R) The eardrum sends these mechanical vibrations to the inner ear, which then transmits the signal to the brain.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

50 / 100

Category: Model using a balloon stretched over a can

50. In the tin-can model of the eardrum, why do the grains on the stretched rubber membrane jump up and down when sound is produced from the open end?

a. The grains absorb the sound energy directly

b. The sound waves push the grains upwards

c. The membrane's vibrations cause the grains to move

d. The grains are repelled by the sound waves

51 / 100

Category: Model using a balloon stretched over a can

51. Consider a tin-can model of the eardrum with a stretched rubber balloon and grains of cereal on it. If the frequency of the sound produced by a friend increases, what happens to the movement of the grains?

a. The grains jump up and down slower

b. The grains jump up and down faster

c. The grains stop moving completely

d. The grains move in random directions

52 / 100

Category: Amplitude, Time Period, and Frequency of a Vibration

52. A sound wave has a frequency of 500 Hz. If the frequency is doubled, how does the pitch of the sound change?

a. Pitch decreases to half

b. Pitch remains the same

c. Pitch doubles and becomes higher

d. Pitch quadruples

53 / 100

Category: Amplitude, Time Period, and Frequency of a Vibration

53. A tuning fork completes 200 oscillations in 5 seconds. What is its frequency and time period?

a. Frequency = 40 Hz, Time Period = 0.025 s

b. Frequency = 20 Hz, Time Period = 0.05 s

c. Frequency = 50 Hz, Time Period = 0.02 s

d. Frequency = 10 Hz, Time Period = 0.1 s

54 / 100

Category: Loudness and Pitch

54. If the amplitude of vibration of a sound-producing object is doubled, how does the loudness of the sound change?

a. Increases by a factor of 2

b. Increases by a factor of 4

c. Decreases by a factor of 2

d. Remains the same

55 / 100

Category: Loudness and Pitch

55. (A) The loudness of sound is directly proportional to the amplitude of vibration.
(R) A higher amplitude of vibration results in a larger displacement of the air particles, producing a louder sound.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

56 / 100

Category: Amplitude: Height of vibration affecting loudness

56. An object oscillates with a frequency of 50 Hz. What is the time period of its oscillation?

a. 0.01 seconds

b. 0.02 seconds

c. 0.05 seconds

d. 0.10 seconds

57 / 100

Category: Amplitude: Height of vibration affecting loudness

57. What is the effect of increasing the amplitude of a sound wave?

a. The sound becomes softer

b. The sound becomes louder

c. The pitch of the sound increases

d. The frequency of the sound decreases

58 / 100

Category: Time Period: Time taken for one complete vibration

58. (A) The time period of a vibrating object is inversely proportional to its frequency.

(R) The frequency of a vibrating object is defined as the number of oscillations per second.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

59 / 100

Category: Time Period: Time taken for one complete vibration

59. Time taken by an object to complete one oscillation is called __________.

a. Frequency

b. Amplitude

c. Time Period

d. Wavelength

60 / 100

Category: Frequency: Number of vibrations per second (Hertz, Hz)

60. Two sounds are produced with frequencies of 200 Hz and 400 Hz respectively. Which sound will have a higher pitch, and how many times higher is its frequency compared to the other?

a. 400 Hz, 2 times higher

b. 200 Hz, 2 times higher

c. 400 Hz, 1.5 times higher

d. 200 Hz, 1.5 times higher

61 / 100

Category: Frequency: Number of vibrations per second (Hertz, Hz)

61. Which of the following frequencies is audible to the human ear?

a. 5 Hz

b. 1,000 Hz

c. 25,000 Hz

d. 30,000 Hz

62 / 100

Category: Effect of Amplitude on Loudness

62. If the amplitude of a vibrating object is doubled, how does the loudness of the sound produced change?

a. The loudness remains the same.

b. The loudness becomes 2 times.

c. The loudness becomes 4 times.

d. The loudness becomes 8 times.

63 / 100

Category: Effect of Amplitude on Loudness

63. A tuning fork vibrates at a frequency of 440 Hz. Another tuning fork vibrates at a frequency of 220 Hz. How does the pitch of the sound produced by the first tuning fork compare to that of the second tuning fork?

a. The same pitch

b. Lower pitch

c. Higher pitch

d. Cannot be determined

64 / 100

Category: Larger amplitude = Louder sound

64. What happens to the pitch of a sound if its frequency is increased?

a. The pitch decreases

b. The pitch remains the same

c. The pitch increases

d. The pitch becomes zero

65 / 100

Category: Larger amplitude = Louder sound

65. Which of the following statements is true about the relationship between amplitude and loudness?

a. Loudness is independent of amplitude

b. Loudness decreases with increasing amplitude

c. Loudness increases with increasing amplitude

d. Loudness is inversely proportional to amplitude

66 / 100

Category: Measurement in decibels (dB)

66. The amplitude of a sound wave is tripled. By how many decibels does the loudness increase?

a. 6 dB

b. 9 dB

c. 12 dB

d. 15 dB

67 / 100

Category: Measurement in decibels (dB)

67. (A) The loudness of sound produced by a vibrating object increases when the amplitude of vibration is doubled.
(R) The loudness of sound is directly proportional to the square of the amplitude of vibration.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

68 / 100

Category: Effect of Frequency on Pitch

68. (A) The pitch of a sound produced by a whistle is higher than that of a drum because the whistle vibrates with a higher frequency.
(R) The pitch of a sound is directly determined by its frequency, with higher frequencies resulting in higher pitches.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

69 / 100

Category: Effect of Frequency on Pitch

69. (A) The pitch of a sound produced by a vibrating object increases if its frequency of vibration increases.
(R) The pitch of a sound is directly proportional to its frequency, as higher frequency results in a higher pitch.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

70 / 100

Category: High frequency → Shrill sound (e.g., bird chirp)

70. The amplitude of a vibrating object producing sound is increased by a factor of 3. How does this affect the loudness of the sound?

a. The loudness becomes 3 times greater.

b. The loudness becomes 6 times greater.

c. The loudness becomes 9 times greater.

d. The loudness remains unchanged.

71 / 100

Category: High frequency → Shrill sound (e.g., bird chirp)

71. A bird produces a sound with a frequency of 4000 Hz. What can be inferred about the pitch of this sound compared to a lion's roar with a frequency of 100 Hz?

a. The bird's sound has a lower pitch than the lion's roar.

b. The bird's sound has the same pitch as the lion's roar.

c. The bird's sound has a higher pitch than the lion's roar.

d. The pitch of the bird's sound cannot be determined.

72 / 100

Category: Low frequency → Deep sound (e.g., lion’s roar)

72. (A) The roar of a lion is louder than the sound produced by a bird because the amplitude of the lion's roar is larger.
(R) Amplitude determines the loudness of a sound.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

73 / 100

Category: Low frequency → Deep sound (e.g., lion’s roar)

73. If the amplitude of a sound wave is doubled, how does the loudness change?

a. It becomes half

b. It becomes double

c. It becomes four times

d. It remains the same

74 / 100

Category: Audible and Inaudible Sounds

74. A medical ultrasound device operates at a frequency of $25,000 Hz$. Which of the following statements is true regarding the sound produced by this device?

a. The sound is audible to humans but not to dogs.

b. The sound is inaudible to both humans and dogs.

c. The sound is audible to both humans and dogs.

d. The sound is inaudible to humans but can be heard by dogs.

75 / 100

Category: Audible and Inaudible Sounds

75. What is the range of audible frequencies for the human ear?

a. 5 Hz to 10,000 Hz

b. 10 Hz to 15,000 Hz

c. 20 Hz to 20,000 Hz

d. 30 Hz to 25,000 Hz

76 / 100

Category: Human Hearing Range

76. (A) Humans can hear the sound of a vibrating body with a frequency of 18 Hz.
(R) The human hearing range is from 20 Hz to 20,000 Hz.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

77 / 100

Category: Noise and Music

77. Which of the following health problems can be caused by noise pollution?

a. Improved concentration

b. Better sleep quality

c. Hypertension

d. Enhanced hearing ability

78 / 100

Category: Definition of Noise and Music

78. Which of the following sounds is considered musical?

a. Construction site sounds

b. Horns of buses and trucks

c. Sitar string

d. Students speaking together

79 / 100

Category: Noise: Unpleasant, irregular sounds

79. Which of the following problems can be caused by excessive noise pollution?

a. Improved hearing

b. Stress and anxiety

c. Better sleep quality

d. Enhanced concentration

80 / 100

Category: Music: Pleasant, rhythmic sounds

80. If the amplitude of a sound wave is halved, how does it affect the loudness of the sound and its potential to contribute to noise pollution?

a. Loudness increases, noise pollution increases

b. Loudness decreases, noise pollution decreases

c. Loudness remains the same, noise pollution increases

d. Loudness decreases, noise pollution remains the same

81 / 100

Category: Traffic sounds, construction, loudspeakers

81. (A) Continuous exposure to loud sounds from traffic and construction sites can lead to temporary or permanent hearing impairment.
(R) Noise pollution causes health issues like hypertension, anxiety, and hearing loss due to excessive or unwanted sounds in the environment.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

82 / 100

Category: Harmonium, flute, veena

82. A child’s voice is generally higher in pitch compared to an adult’s voice. What does this indicate about the frequency of the sound produced by the child?

a. The child’s voice has a lower frequency

b. The child’s voice has a higher frequency

c. The child’s voice has the same frequency as an adult

d. The child’s voice has no frequency

83 / 100

Category: Noise Pollution

83. Which of the following sounds is considered a musical sound?

a. Sound of a truck horn

b. Sound of construction work

c. Sound of a sitar

d. Sound of a loudspeaker

84 / 100

Category: Sources of Noise Pollution

84. Excessive noise pollution can lead to which of the following health issues?

a. Improved concentration

b. Hearing loss

c. Enhanced memory

d. Increased appetite

85 / 100

Category: Vehicles, factory machines, construction work

85. (A) Planting trees along roads and around buildings is an effective measure to reduce noise pollution in residential areas.
(R) Trees act as natural sound barriers by absorbing and deflecting sound waves, thereby reducing their intensity.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

86 / 100

Category: Home appliances (TV, loudspeakers)

86. A desert cooler and an air conditioner are both running in a home. The cooler produces 65 dB of noise, and the air conditioner produces 68 dB. What is the combined noise level?

a. 67 dB

b. 68 dB

c. 69 dB

d. 70 dB

87 / 100

Category: Effects of Noise Pollution

87. What is an effective measure to reduce noise pollution in a residential area?

a. Increasing the volume of loudspeakers

b. Planting trees around buildings

c. Setting up noisy industries nearby

d. Using more air conditioners

88 / 100

Category: Health issues: Stress, anxiety, high blood pressure, hearing impairment

88. Which of the following health issues is most likely to be caused by prolonged exposure to noise pollution?

a. Migraine headaches

b. Asthma

c. Chronic stress and anxiety

d. Skin rashes

89 / 100

Category: Measures to Control Noise Pollution

89. A factory owner wants to reduce noise pollution from industrial machines. Which of the following measures would be most suitable for achieving this goal?

a. Increasing the speed of machines to reduce operational time

b. Installing silencing devices in industrial machines

c. Reducing the number of workers in the factory

d. Using older, noisier machines instead of newer ones

90 / 100

Category: Use of silencers in vehicles

90. Which measure is essential for reducing noise in industrial machines?

a. Increase machine speed

b. Install silencing devices

c. Use louder machinery

d. Operate machinery continuously

91 / 100

Category: Plantation of trees

91. How can noise pollution be effectively reduced in residential areas?

a. By increasing the volume of TV and music systems

b. By conducting noisy operations near residential areas

c. By planting trees along roads and around buildings

d. By setting up noise-producing industries near residential areas

92 / 100

Category: Keeping industries away from residential areas

92. What is one harmful effect of noise pollution mentioned in the syllabus?

a. Improved concentration

b. Better air quality

c. Sleep disturbances

d. Increased energy levels

93 / 100

Category: Hearing Impairment

93. Which of the following is a common cause of partial hearing impairment?

a. Birth defect

b. Disease or injury

c. Genetic mutation

d. Environmental noise

94 / 100

Category: Causes of Hearing Impairment

94. What can cause damage to the eardrum and impair hearing?

a. Listening to loud music

b. Using earphones

c. Inserting sharp objects into the ear

d. Swimming in deep water

95 / 100

Category: Congenital deafness

95. How can society help improve the quality of life for individuals with hearing impairment?

a. Ignoring their needs

b. Providing access to technological devices

c. Discouraging the use of sign language

d. Limiting their participation in social activities

96 / 100

Category: Damage due to disease or injury

96. What is the primary reason for partial hearing impairment in individuals?

a. Disease or injury

b. Genetic factors from birth

c. Exposure to loud music

d. Use of sign language

97 / 100

Category: Technological Support

97. A child with partial hearing impairment is using a hearing aid that amplifies sound by 30 dB. If the ambient noise level is 50 dB, what is the effective sound level perceived by the child?

a. 70 dB

b. 80 dB

c. 90 dB

d. 100 dB

98 / 100

Category: Hearing aids, sign language

98. Which of the following is a primary function of a hearing aid?

a. To cure hearing impairment completely

b. To amplify sound for better hearing

c. To teach sign language

d. To diagnose hearing loss

99 / 100

Category: Social Awareness

99. (A) Children with hearing impairment often develop defective speech because they cannot hear sounds clearly.
(R) Speech development in children is directly influenced by their ability to hear sounds accurately.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

100 / 100

Category: Helping hearing-impaired individuals integrate into society

100. (A) Technological devices for the hearing-impaired are essential for improving their quality of life.
(R) These devices help in amplifying sound, making it easier for individuals with partial hearing loss to communicate effectively.

a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

b. Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

c. Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

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