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) The sound produced by a dog whistle cannot be heard by humans.
(R) The frequency of the sound produced by a dog whistle is above 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.

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. (A) A blindfolded person in the game hide and seek can identify the closest player based on the intensity of the sound produced by their footsteps.
(R) The intensity of sound decreases with distance from the source.

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.

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. When a rubber band is plucked, it vibrates and produces sound. What happens when the rubber band stops vibrating?

a. The rubber band continues to produce sound

b. The rubber band stops producing sound

c. The rubber band produces louder sound

d. The rubber band produces softer sound

7 / 100

Category: Experiments Demonstrating Vibrations

7. What happens when you hold a vibrating metal plate tightly after striking it with a stick? What does this demonstrate about sound production?

a. The plate continues to vibrate, producing louder sound

b. The plate stops vibrating, and the sound ceases

c. The plate breaks into pieces, creating noise

d. The plate becomes hotter, producing a different sound

8 / 100

Category: Striking a metal plate

8. Why does a metal dish produce sound when struck with a spoon?

a. The spoon makes a sound by itself

b. The dish vibrates and produces sound waves

c. The dish melts and creates a humming noise

d. The dish heats up and produces sound

9 / 100

Category: Plucking a rubber band

9. When a rubber band is plucked, what happens to it?

a. It melts and evaporates

b. It breaks into pieces

c. It vibrates and produces sound

d. It remains stationary and silent

10 / 100

Category: Water vibrations in a dish

10. When a metal dish filled with water is struck at its edge, what happens to the water surface?

a. The water becomes still

b. Waves form on the surface of the water

c. The water heats up

d. The water level decreases

11 / 100

Category: Musical Instruments and Vibrations

11. What part of the human body vibrates to produce sound when we speak?

a. Lungs

b. Tongue

c. Vocal cords

d. Teeth

12 / 100

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

12. A stretched string of a musical instrument produces a sound wave with a frequency of 440 Hz. If the amplitude of the vibration is doubled, how does this affect the loudness of the sound perceived by the listener?

a. The loudness remains the same

b. The loudness doubles

c. The loudness quadruples

d. The loudness decreases by half

13 / 100

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

13. Which of the following instruments produces sound by vibrating its membrane?

a. Veena

b. Tablae Flute

c. Tabla

d. Manjira

14 / 100

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

14. What would you observe if you strike a Manjira gently with a stick and immediately hold it tightly?

a. The sound becomes louder

b. The sound continues for a while

c. No sound is heard

d. The Manjira breaks

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) The pitch of sound produced by humans is determined solely by the length of the vocal cords.
(R) Shorter vocal cords produce higher-pitched sounds because they vibrate at a higher frequency.

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.

17 / 100

Category: Location and function

17. Why do men generally have deeper voices compared to women?

a. Shorter vocal cords

b. Longer vocal cords

c. Faster vibration rate

d. Thicker vocal cords

18 / 100

Category: Role of vocal cords in sound production

18. How does the tightness of the vocal cords affect the quality of sound produced?

a. Tight vocal cords produce lower-pitched sounds.

b. Loose vocal cords produce higher-pitched sounds.

c. Tight vocal cords produce higher-pitched sounds, while loose cords produce lower-pitched sounds.

d. The tightness of the vocal cords does not affect the sound produced.

19 / 100

Category: Variation in Voice

19. A person is asked to hum at a constant pitch for 10 seconds. During this time, what happens to the vocal cords and the air passing through them in the voice box?

a. The vocal cords stop vibrating after 5 seconds

b. The air flow increases, causing the pitch to rise

c. The vocal cords vibrate steadily, and the air flow remains constant

d. The vocal cords become loose, reducing the pitch

20 / 100

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

20. (A) The frequency of a child's voice is higher than that of an adult because their vocal cords are shorter.
(R) Shorter vocal cords vibrate at a higher frequency, producing higher-pitched sounds.

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.

21 / 100

Category: Role of vocal cord length in pitch

21. (A) The pitch of a man's voice is lower than that of a woman because men have longer vocal cords.
(R) Longer vocal cords vibrate at a lower frequency, producing a lower 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.

22 / 100

Category: Sound Needs a Medium for Propagation

22. In an experiment, air is gradually removed

from a vessel containing a ringing bell. What happens to the loudness of the sound as more air is removed?

a. The loudness of the sound increases.

b. The loudness of the sound remains the same.

c. The loudness of the sound decreases.

d. The sound becomes ultrasonic.

23 / 100

Category: Experiments on Medium Requirement

23. (A) Sound cannot travel through a vacuum because there is no medium to carry the vibrations.
(R) A vacuum is defined as a space entirely devoid of matter, and sound requires a material medium for 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.

24 / 100

Category: Sound in air (Tumbler and cellphone experiment)

24. (A) Sound cannot be heard when all the air is removed from a vessel, creating a vacuum.
(R) Sound requires a medium to propagate, and a vacuum lacks such a medium.

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.

25 / 100

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

25. (A) Sound can travel through liquids as demonstrated by the water bucket and bell experiment.
(R) In the water bucket and bell experiment, the sound produced by the bell is heard when the ear is placed on the water surface, indicating that sound waves propagate through the liquid medium.

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.

26 / 100

Category: Sound in solids (Metal rod experiment)

26. (A) In a metal rod experiment, sound travels faster through the rod than through air.
(R) The speed of sound in solids is higher than in gases due to the closer arrangement of particles in solids.

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.

27 / 100

Category: Propagation of Sound in Different Media

27. A sound wave is traveling through three different media: air, water, and a metal rod. If the frequency of the sound wave remains constant, in which medium will the wavelength of the sound wave be the longest?

a. Air

b. Water

c. Metal rod

d. All three mediums have the same wavelength

28 / 100

Category: Gases: Air as a medium

28. Which of the following mediums allows sound to travel the fastest?

a. Air

b. Water

c. Solids

d. Vacuum

29 / 100

Category: Gases: Air as a medium

29. (A) Sound cannot travel through a vacuum.
(R) Sound requires a medium, such as air, 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.

30 / 100

Category: Liquids: Sound transmission underwater

30. A bell is shaken underwater to produce sound, and the sound is heard by placing an ear on the water surface. What does this experiment demonstrate?

a. Sound cannot travel through liquids

b. Sound travels faster in liquids than in air

c. Sound can travel through liquids

d. Sound travels only in solids

31 / 100

Category: Liquids: Sound transmission underwater

31. (A) Sound can travel through water because water molecules vibrate and transfer energy.
(R) The speed of sound in water is higher than in air due to the closer arrangement of water molecules.

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.

32 / 100

Category: Solids: Sound traveling through metal/wood

32. (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.

33 / 100

Category: Solids: Sound traveling through metal/wood

33. (A) Sound can travel through solids like metal and wood.
(R) Solids provide a medium for sound waves to propagate due to their closely packed molecules.

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. Why can’t sound travel through a vacuum?

a. Sound waves are absorbed by the vacuum.

b. Sound waves need a medium to travel, which is absent in a vacuum.

c. Sound waves lose energy rapidly in a vacuum.

d. Sound waves get converted into light waves in a vacuum.

35 / 100

Category: Concept of Vacuum

35. In an experiment, a ringing cell phone is placed inside a dry tumbler, and air is sucked out. What observation supports the idea that sound needs a medium for propagation?

a. The sound becomes louder as air is removed.

b. The sound stops completely when all the air is removed.

c. The sound changes pitch but remains audible.

d. The sound becomes distorted but does not stop.

36 / 100

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

36. Why does the sound become fainter when air is sucked out of a tumbler during an experiment with a ringing cell phone?

a. The cell phone stops vibrating

b. The sound waves get absorbed by the tumbler

c. The medium (air) carrying the sound waves decreases

d. The speed of sound increases

37 / 100

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

37. Which of the following is an example of a medium that does not allow sound to travel?

a. Air

b. Water

c. Space

d. Metal

38 / 100

Category: We Hear Sound through Our Ears

38. 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.

39 / 100

Category: We Hear Sound through Our Ears

39. (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.

40 / 100

Category: Structure of the Human Ear

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

41 / 100

Category: Structure of the Human Ear

41. A student builds a tin-can model of the eardrum as described in Activity 10.10. If the friend speaks "Hurrey, Hurrey" louder, what would happen to the grains of cereal placed on the stretched rubber?

a. The grains will jump lower and less frequently

b. The grains will not move at all

c. The grains will jump higher and more vigorously

d. The grains will scatter off the rubber surface

42 / 100

Category: Outer ear: Funnel-like structure

42. (A) The outer ear has a funnel-like shape that helps in collecting sound waves.
(R) The funnel-like structure of the outer ear amplifies the sound waves before they reach the eardrum.

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.

43 / 100

Category: Outer ear: Funnel-like structure

43. (A) The outer ear is funnel-shaped to collect sound waves efficiently.
(R) The shape of the outer ear helps in directing sound waves towards the eardrum.

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.

44 / 100

Category: Middle ear: Eardrum (tympanic membrane)

44. A person speaks loudly near the open end of a tin-can model of the eardrum with grains placed on the stretched rubber membrane. What happens to the grains and why?

a. The grains remain stationary because the sound is not loud enough

b. The grains move randomly due to air currents inside the can

c. The grains jump up and down due to the vibration of the rubber membrane

d. The grains stick to the rubber membrane because of static electricity

45 / 100

Category: Middle ear: Eardrum (tympanic membrane)

45. What happens when sound waves reach the eardrum?

a. The eardrum absorbs the sound waves

b. The eardrum vibrates in response to sound waves

c. The eardrum produces sound waves

d. The eardrum blocks the sound waves

46 / 100

Category: Inner ear: Nerve signals to the brain

46. What happens when sound waves reach the eardrum?

a. The eardrum amplifies the sound

b. The eardrum converts sound into electrical signals directly

c. The eardrum vibrates and sends signals to the inner ear

d. The eardrum blocks the sound from entering the inner ear

47 / 100

Category: Inner ear: Nerve signals to the brain

47. Which of the following actions could potentially damage the eardrum?

a. Listening to loud music with headphones

b. Inserting a cotton swab gently into the ear

c. Inserting a pointed object into the ear

d. Covering the ears with hands

48 / 100

Category: Experiment on Eardrum Sensitivity

48. Why should sharp or hard objects never be inserted into the ear?

a. It can cause temporary deafness

b. It can damage the eardrum

c. It can cause ear infections

d. It can block the ear canal

49 / 100

Category: Experiment on Eardrum Sensitivity

49. 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

50 / 100

Category: Model using a balloon stretched over a can

50. 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

51 / 100

Category: Model using a balloon stretched over a can

51. (A) The grains of dry cereal on the stretched rubber of the tin-can model jump up and down when sound is produced from the open end.
(R) The vibration of the rubber membrane due to sound waves causes the grains to move.

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.

52 / 100

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

52. If the amplitude of a sound wave is tripled, by what factor does the loudness increase?

a. Factor of 3

b. Factor of 6

c. Factor of 9

d. Factor of 12

53 / 100

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

53. What is the time period of a vibration if its frequency is 100 Hz?

a. 0.001 seconds

b. 0.01 seconds

c. 0.1 seconds

d. 1 second

54 / 100

Category: Loudness and Pitch

54. Which of the following sounds would have the highest pitch?

a. Sound of a lion

b. Sound of a drum

c. Sound of a whistle

d. Sound of a bird

55 / 100

Category: Loudness and Pitch

55. (A) The loudness of a sound produced by a vibrating object is directly proportional to the amplitude of vibration.
(R) The pitch of a sound is determined by its frequency, while loudness is determined by 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.

56 / 100

Category: Amplitude: Height of vibration affecting loudness

56. A vibrating object produces sound with an amplitude of 2 cm. If the amplitude is doubled, by what factor does the loudness increase?

a. 2

b. 3

c. 4

d. 6

57 / 100

Category: Amplitude: Height of vibration affecting loudness

57. What is the time period of a vibration if its frequency is 20 Hz?

a. 0.05 seconds

b. 0.5 seconds

c. 5 seconds

d. 20 seconds

58 / 100

Category: Time Period: Time taken for one complete vibration

58. A pendulum completes 60 oscillations in 15 seconds. What is the time period and frequency of the pendulum?

a. Time period: 0.25 s, Frequency: 4 Hz

b. Time period: 0.5 s, Frequency: 2 Hz

c. Time period: 0.15 s, Frequency: 6.67 Hz

d. Time period: 0.20 s, Frequency: 5 Hz

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

a. 15 Hz

b. 500 Hz

c. 25,000 Hz

d. 5 Hz

61 / 100

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

61. 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

62 / 100

Category: Effect of Amplitude on Loudness

62. A sound wave has an amplitude of 2 units. If the amplitude is increased to 6 units, how many times louder will the sound be perceived?

a. 3 times louder

b. 6 times louder

c. 9 times louder

d. 12 times louder

63 / 100

Category: Effect of Amplitude on Loudness

63. (A) The loudness of sound increases when the amplitude of vibration increases.
(R) Loudness 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.

64 / 100

Category: Larger amplitude = Louder sound

64. Two sounds are produced with frequencies of 200 Hz and 400 Hz respectively. Which statement correctly describes the pitch of these sounds?

a. Both sounds have the same pitch

b. The first sound has a higher pitch than the second sound

c. The second sound has a higher pitch than the first sound

d. The pitch cannot be determined from the given information

65 / 100

Category: Larger amplitude = Louder sound

65. A sound wave has an amplitude of 2 units and a frequency of 50 Hz. If the amplitude is increased to 4 units while keeping the frequency constant, 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

66 / 100

Category: Measurement in decibels (dB)

66. (A) The loudness of sound increases when the amplitude of vibration increases.
(R) Loudness of sound is 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. \item Assertion is true, but Reason is false.

d. Assertion is false, but Reason is true.

67 / 100

Category: Measurement in decibels (dB)

67. Which of the following sounds has the highest decibel level?

a. Normal breathing

b. Soft whisper at 5m

c. Normal conversation

d. Busy traffic

68 / 100

Category: Effect of Frequency on Pitch

68. Consider two sounds: one produced by a drum and another by a whistle. Which of the following statements about their frequencies and pitches is correct?

a. The drum has a higher frequency and therefore a higher pitch.

b. The whistle has a lower frequency and therefore a lower pitch.

c. The drum has a lower frequency and therefore a lower pitch.

d. The whistle and the drum have the same frequency and pitch.

69 / 100

Category: Effect of Frequency on Pitch

69. A drum produces a sound with a frequency of 50 Hz, while a whistle produces a sound with a frequency of 1000 Hz. Which statement correctly describes the pitch of these sounds?

a. Both the drum and whistle produce high-pitched sounds.

b. The drum produces a high-pitched sound, and the whistle produces a low-pitched sound.

c. Both the drum and whistle produce low-pitched sounds.

d. The drum produces a low-pitched sound, and the whistle produces a high-pitched sound.

70 / 100

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

70. (A) A bird chirp has a higher pitch than a lion\'s roar because it has a higher frequency.
(R) The pitch of a sound is determined by its frequency.

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.

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 sound wave has a frequency of 20 Hz. What can be inferred about its pitch?

a. High pitch

b. Low pitch

c. Cannot be determined

d. Moderate pitch

73 / 100

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

73. A tuning fork vibrates 300 times in 5 seconds. If the amplitude of vibration is doubled, how will the loudness of the sound produced change?

a. The loudness will remain the same

b. The loudness will double

c. The loudness will quadruple

d. The loudness will halve

74 / 100

Category: Audible and Inaudible Sounds

74. 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

75 / 100

Category: Audible and Inaudible Sounds

75. 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.

76 / 100

Category: Human Hearing Range

76. A sound wave has a frequency of $25 \text{ kHz}$. Which of the following statements is true regarding the audibility of this sound?

a. The sound is audible to humans because its frequency is within the range of $20 \text{ Hz}$ to $20,000 \text{ Hz}$.

b. The sound is inaudible to humans but can be heard by dogs because its frequency exceeds the upper limit of human hearing range.

c. The sound is inaudible to both humans and animals as it is below the lower limit of the human hearing range.

d. The sound is audible to humans because it falls within the frequency range of $20,000 \text{ Hz}$ to $25,000 \text{ Hz}$.

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 an example of noise?

a. Sound produced by a sitar

b. Sound produced by a harmonium

c. Sound produced by a truck horn

d. Sound produced by a flute

79 / 100

Category: Noise: Unpleasant, irregular sounds

79. (A) Music cannot cause noise pollution because it is always pleasant to the ear.
(R) Noise pollution is caused only by sounds that are unpleasant and irregular.

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.

80 / 100

Category: Music: Pleasant, rhythmic sounds

80. (A) The sound produced by a musical instrument is always pleasant to the ear, regardless of its amplitude.
(R) The pleasantness of a musical sound depends on the frequency of vibrations and not on the amplitude.

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.

81 / 100

Category: Traffic sounds, construction, loudspeakers

81. In a classroom, if all students speak together, the sound produced is considered noise. Which of the following scenarios would also be classified as noise?

a. Sound produced by a harmonium

b. Sound produced by the string of a sitar

c. Sound produced by horns of buses and trucks

d. Sound produced by a musical orchestra

82 / 100

Category: Harmonium, flute, veena

82. When air is pumped into a harmonium, which part of the instrument primarily vibrates to produce musical sound?

a. The keys

b. The bellows

c. The reeds

d. The outer casing

83 / 100

Category: Noise Pollution

83. Which of the following is a measure to control noise pollution in residential areas?

a. Increasing the volume of television

b. Setting up industries near residential areas

c. Planting trees along roads

d. Using more automobile horns

84 / 100

Category: Sources of Noise Pollution

84. (A) Planting trees along roads and around buildings can significantly reduce the harmful effects of noise pollution in residential areas.
(R) Trees act as natural sound barriers by absorbing and deflecting sound waves, thus reducing the intensity of noise reaching the residents.

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.

85 / 100

Category: Vehicles, factory machines, construction work

85. A construction site is located near a residential area. The sound level at the boundary of the residential area is measured to be 85 dB. If the construction site is moved 100 meters away from the residential area, and assuming the sound intensity follows the inverse square law, what will be the new sound level at the residential boundary?

a. 70 dB

b. 75 dB

c. 80 dB

d. 85 dB

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. (A) Noise pollution can cause hearing impairment in individuals.
(R) Continuous exposure to loud sounds can damage the auditory system.

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.

89 / 100

Category: Measures to Control Noise Pollution

89. (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 that absorb and scatter sound waves, thereby reducing the noise levels reaching the residents.

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.

90 / 100

Category: Use of silencers in vehicles

90. What is one effective measure to reduce noise pollution in residential areas?

a. Increasing the volume of music systems

b. Installing more streetlights

c. Planting trees along roads

d. Using louder horns in vehicles

91 / 100

Category: Plantation of trees

91. (A) Planting trees along roads and around buildings is an effective method to reduce noise pollution in residential areas.
(R) Trees act as natural sound barriers by absorbing, deflecting, and diffracting sound waves, thereby reducing the intensity of noise reaching the residents.

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.

92 / 100

Category: Keeping industries away from residential areas

92. A new industrial zone is being planned near a residential area. The noise level at the boundary of the residential area is currently 50 dB. If the industrial zone is expected to produce an additional 40 dB of noise, what will be the combined noise level at the boundary if both sources are active?

a. 45 dB

b. 50.4 dB

c. 55 dB

d. 60 dB

93 / 100

Category: Hearing Impairment

93. Which of the following can help children with hearing impairment communicate effectively?

a. Sign language

b. Speech therapy

c. Lip reading

d. Hearing aids

94 / 100

Category: Causes of Hearing Impairment

94. A child accidentally inserts a sharp object into their ear, leading to a damaged eardrum. What is the most likely long-term consequence of this action?

a. Improved hearing over time

b. Temporary hearing loss

c. Partial or complete hearing loss

d. No effect on hearing

95 / 100

Category: Congenital deafness

95. (A) Total hearing impairment is usually present from birth.
(R) Congenital deafness is a common cause of total hearing impairment.

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.

96 / 100

Category: Damage due to disease or injury

96. (A) Exposure to excessive noise pollution can lead to permanent hearing impairment.
(R) Continuous loud sounds can damage the eardrum, causing hearing loss.

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.

97 / 100

Category: Technological Support

97. Which of the following technological devices is commonly used to assist individuals with hearing impairment?

a. Hearing aids

b. Wheelchairs

c. Braille books

d. Prosthetic limbs

98 / 100

Category: Hearing aids, sign language

98. A hearing-impaired individual uses a cochlear implant and also relies on sign language for communication. How does this combination contribute to their quality of life?

a. Cochlear implants eliminate the need for any other form of communication

b. Sign language is only necessary for those without cochlear implants

c. Both methods together improve communication flexibility and social interaction

d. Cochlear implants are ineffective for individuals who know sign language

99 / 100

Category: Social Awareness

99. (A) Children with hearing impairment can lead normal lives with the help of technological devices and societal support.
(R) Technological devices for the hearing-impaired have significantly improved their quality of life, and society plays a crucial role in creating a supportive 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.

100 / 100

Category: Helping hearing-impaired individuals integrate into society

100. What role do technological devices play in the lives of hearing-impaired individuals?

a. Increase social isolation

b. Improve quality of life

c. Make communication harder

d. Have no impact on daily life

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