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. In a classroom, how does the teacher signal the end of a period to the students?

a. By writing on the blackboard

b. By ringing a bell

c. By turning off the lights

d. By raising a hand

3 / 100

Category: Examples of sound perception

3. How do we know that a period is over in school?

a. By seeing the clock

b. By hearing the sound of the bell

c. By feeling vibrations on the table

d. By observing the teacher's actions

4 / 100

Category: Basic questions about sound production and travel

4. (A) Sound is produced by the vibration of objects.
(R) Vibrations create pressure waves in the air, which travel as 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.

5 / 100

Category: Sound is Produced by a Vibrating Body

5. What part of a veena vibrates to produce sound?

a. Stretched membrane

b. Stretched string

c. Hollow body

d. Metal plate

6 / 100

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

6. A school bell is touched when not in use and again when producing sound. What difference is observed in both cases and why?

a. Vibrations are felt only when the bell is not in use

b. Vibrations are felt only when the bell is producing sound

c. No difference is observed in both cases

d. Vibrations are felt in both cases

7 / 100

Category: Experiments Demonstrating Vibrations

7. What do you observe on the surface of water when a metal dish containing water is struck with a spoon?

a. The water becomes still

b. Waves are formed on the surface of the water

c. The water evaporates

d. The dish breaks

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 rubber band is stretched tightly around a pencil box and plucked in the middle. Which of the following statements is true regarding the sound produced?

a. Sound is produced even when the rubber band is not vibrating.

b. Sound is produced only when the rubber band vibrates.

c. Sound is produced by the pencil box, not the rubber band.

d. Sound is produced by the pencils inserted between the box and the rubber band.

10 / 100

Category: Water vibrations in a dish

10. Why does striking the dish produce sound?

a. Because the spoon hits the dish

b. Because the water evaporates

c. Because the dish vibrates and produces sound waves

d. Because the dish heats up

11 / 100

Category: Musical Instruments and Vibrations

11. Which part of a tabla vibrates to produce sound?

a. Stretched string

b. Stretched membrane

c. Metal plate

d. Air column

12 / 100

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

12. A sitar string of length 0.65 m is vibrating at its fundamental frequency of 330 Hz. If the tension in the string is increased by a factor of 4, what will be the new fundamental frequency of the string? Assume the linear density of the string remains constant.

a. 165 Hz

b. 330 Hz

c. 660 Hz

d. 1320 Hz

13 / 100

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

13. A tabla player strikes the membrane with varying force. If the amplitude of vibration increases by a factor of 3, how does the loudness of the sound change?

a. Increases by a factor of 3

b. Increases by a factor of 6

c. Increases by a factor of 9

d. Remains unchanged

14 / 100

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

14. A Ghatam is struck with a stick and produces sound. What happens to the vibrations of the Ghatam when it is held tightly immediately after being struck?

a. The vibrations increase in amplitude

b. The vibrations remain unchanged

c. The vibrations stop completely

d. The vibrations become irregular

15 / 100

Category: Sound Produced by Humans

15. Where is the voice box located in humans, and what is its function?

a. In the chest, responsible for breathing

b. At the upper end of the windpipe, producing sound

c. In the nasal cavity, filtering air

d. In the mouth, aiding in digestion

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. 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. What causes the variation in the quality of human voices?

a. Shape of the lungs

b. Type of food consumed

c. Tightness or looseness of the vocal cords

d. Size of the windpipe

20 / 100

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

20. Why do men generally have a deeper voice compared to women?

a. Women have longer vocal cords

b. Men have shorter vocal cords

c. Men have longer vocal cords

d. Women have thicker vocal cords

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 a model of the human ear, a stretched rubber membrane represents the eardrum and small grains are placed on it. When sound waves hit the membrane, what happens to the grains and why?

a. The grains remain stationary due to inertia

b. The grains move sideways due to wind pressure

c. The grains jump up and down due to vibrations

d. The grains dissolve due to moisture in the air

23 / 100

Category: Experiments on Medium Requirement

23. What happens to the sound when air is sucked out of a glass tumbler?

a. The sound becomes louder

b. The sound becomes fainter

c. The sound stops immediately

d. The sound remains unchanged

24 / 100

Category: Sound in air (Tumbler and cellphone experiment)

24. Why is it impossible to hear sound in a vacuum?

a. Sound travels faster in a vacuum

b. Sound waves are absorbed by the vacuum

c. There is no medium for sound to travel

d. Sound waves are reflected back

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. A student holds one end of a metal rod to their ear while their friend taps the other end. Which of the following materials, if used instead of the metal rod, would allow the sound to be heard most clearly?

a. Wood

b. Plastic

c. Rubber

d. Metal

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. (A) Sound cannot travel through a vacuum.
(R) Sound requires a medium like air, water, or solids 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.

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. 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

31 / 100

Category: Liquids: Sound transmission underwater

31. A diver is underwater and hears a sound produced by a bell that is 500 meters away from him. If the speed of sound in water is 1500 m/s, how long does it take for the sound to reach the diver?

a. 0.25 seconds

b. 0.33 seconds

c. 0.5 seconds

d. 1 second

32 / 100

Category: Solids: Sound traveling through metal/wood

32. A sound wave traveling through a long metal rod strikes the end of the rod and is reflected back. If the initial amplitude of the sound wave is $A$ and the reflected wave has an amplitude of $0.8A$, what fraction of the energy of the sound wave is lost during reflection?

a. 0.16

b. 0.36

c. 0.64

d. 0.8

33 / 100

Category: Solids: Sound traveling through metal/wood

33. (A) Sound travels faster through a metallic rod than through a wooden rod of the same length and thickness.
(R) The speed of sound in a medium depends on the density and elasticity of the material.

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 cell phone is placed inside a glass tumbler, and air is gradually sucked out of the tumbler. What happens to the sound of the ringtone as the air is removed?

a. The sound becomes louder as air is removed.

b. The sound becomes fainter and eventually stops.

c. The sound remains unchanged throughout the process.

d. The sound becomes distorted but remains audible.

35 / 100

Category: Concept of Vacuum

35. Why does sound become fainter when air is removed from a container?

a. The container absorbs sound

b. The sound waves slow down

c. There is less medium for sound to travel

d. The sound waves change direction

36 / 100

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

36. (A) Sound cannot be heard on the moon because there is no atmosphere to carry it.
(R) Sound requires a medium such as air, water, 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.

37 / 100

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

37. A spaceship is traveling through outer space where there is no medium. If an astronaut inside the spaceship speaks, what will happen to the sound produced?

a. The sound will travel normally and be heard by others in the spaceship.

b. The sound will bounce off the walls of the spaceship and be heard by others.

c. The sound will not travel at all and will not be heard by anyone.

d. The sound will travel faster than normal due to the vacuum.

38 / 100

Category: We Hear Sound through Our Ears

38. Why should we never put sharp objects into our ears?

a. It can improve hearing

b. It can damage the eardrum

c. It can clean the ear canal

d. It can amplify sound

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 canal.
(R) The vibrations of the eardrum are essential for transmitting sound 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) The eardrum vibrates when sound waves reach it.
(R) The eardrum is a thin, stretched membrane that sends vibrations to the inner ear.

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.

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. Why should we avoid putting sharp objects into our ears?

a. It can cause itching

b. It can damage the eardrum

c. It can improve hearing

d. It can clean the ear

44 / 100

Category: Middle ear: Eardrum (tympanic membrane)

44. Why is the outer part of the ear shaped like a funnel?

a. To protect the inner ear from foreign objects

b. To amplify sound waves before they reach the eardrum

c. To collect and direct sound waves into the ear canal

d. To reduce the intensity of loud sounds entering the ear

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. (A) The eardrum converts sound vibrations into nerve signals that are sent to the brain.
(R) The eardrum vibrates in response to sound waves and these vibrations are transmitted to the inner ear, where they are converted into nerve signals.

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.

47 / 100

Category: Inner ear: Nerve signals to the brain

47. 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

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. What is the primary function of the eardrum in the human ear?

a. To protect the inner ear from damage

b. To amplify sound waves

c. To transmit sound vibrations

d. To filter out noise

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. In the tin-can eardrum model, if the amplitude of the sound waves is doubled, what effect does it have on the movement of the grains?

a. The grains move with less height

b. The grains move with greater height

c. The grains stop moving entirely

d. The grains move at the same height

52 / 100

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

52. (A) The loudness of sound depends on its amplitude.
(R) Larger the amplitude of vibration, the louder is the 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.

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

55 / 100

Category: Loudness and Pitch

55. 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

56 / 100

Category: Amplitude: Height of vibration affecting loudness

56. A sound wave has an amplitude of 4 cm and a frequency of 100 Hz. If the amplitude is doubled and the frequency is halved, how does the loudness of the sound change?

a. Increases by a factor of 2

b. Decreases by a factor of 2

c. Increases by a factor of 4

d. Remains the same

57 / 100

Category: Amplitude: Height of vibration affecting loudness

57. An object oscillates 50 times in 5 seconds. What is its frequency in hertz (Hz)?

a. 5 Hz

b. 10 Hz

c. 15 Hz

d. 20 Hz

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. (A) If the time period of a pendulum is 0.5 seconds, its frequency must be 2 Hz.
(R) The frequency of oscillation is the reciprocal of the time period.

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.

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. (A) The frequency of a vibrating object is 50 Hz.
(R) This means the object completes 50 oscillations in one 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.

62 / 100

Category: Effect of Amplitude on Loudness

62. An object completes 15 oscillations in 3 seconds. What is its frequency in hertz (Hz)?

a. 3 Hz

b. 5 Hz

c. 10 Hz

d. 15 Hz

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. 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

65 / 100

Category: Larger amplitude = Louder sound

65. (A) The loudness of sound increases when the amplitude of vibration increases.
(R) The loudness of sound is directly proportional to 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.

66 / 100

Category: Measurement in decibels (dB)

66. An object oscillates 50 times in one second. What is its frequency?

a. 25 Hz

b. 50 Hz

c. 100 Hz

d. 150 Hz

67 / 100

Category: Measurement in decibels (dB)

67. A sound source oscillates at a frequency of 200 Hz. If the frequency is doubled while keeping the amplitude constant, how does the loudness in decibels change?

a. It increases by 6 dB

b. It decreases by 6 dB

c. It remains the same

d. It doubles

68 / 100

Category: Effect of Frequency on Pitch

68. An object completes 300 oscillations in 3 seconds. What is the frequency of the object's vibration?

a. 50 Hz

b. 100 Hz

c. 150 Hz

d. 200 Hz

69 / 100

Category: Effect of Frequency on Pitch

69. A baby's voice has a higher frequency than an adult's voice. What can be inferred about the pitch of their voices?

a. The baby's voice has a lower pitch than the adult's voice.

b. The baby's voice has the same pitch as the adult's voice.

c. The baby's voice has a higher pitch than the adult's voice.

d. The pitch of the voices cannot be compared based on frequency alone.

70 / 100

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

70. An object oscillates with a time period of 0.02 seconds. What is the frequency of oscillation in hertz?

a. 20 Hz

b. 40 Hz

c. 50 Hz

d. 60 Hz

71 / 100

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

71. (A) The loudness of a sound is directly proportional to the amplitude of vibration.
(R) The pitch of a sound is determined by its frequency, not by its 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.

72 / 100

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

72. Which of the following sounds has the lowest pitch?

a. Whistle

b. Bird chirp

c. Lion's roar

d. Woman's voice

73 / 100

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

73. (A) A lion’s roar is louder than a bird’s chirp because the amplitude of the lion’s roar is significantly larger.
(R) The loudness of a sound is directly proportional to the square of its 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.

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) The sound produced by a vibrating body with a frequency of $25 Hz$ is audible to the human ear.
(R) The human ear can detect sounds with frequencies from $20$ 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.

76 / 100

Category: Human Hearing Range

76. Ultrasound equipment used in medical investigations operates at frequencies higher than $20,000 \text{ Hz}$. Which of the following explains why ultrasound is suitable for medical imaging?

a. Ultrasound frequencies are within the human hearing range, making them comfortable for patients during imaging.

b. Ultrasound frequencies are audible to animals, allowing veterinarians to use the same equipment on pets.

c. Ultrasound frequencies are higher than $20,000 \text{ Hz}$, enabling them to penetrate tissues and create detailed images without being heard by humans.

d. Ultrasound frequencies are below the human hearing range, making them safe for long-term exposure.

77 / 100

Category: Noise and Music

77. What type of sound is produced by a sitar?

a. Noise

b. Musical sound

c. Unwanted sound

d. Loud sound

78 / 100

Category: Definition of Noise and Music

78. During a school assembly, students are asked to sing together. If all students sing in harmony, what type of sound is produced? What if they shout loudly and chaotically instead?

a. Both are musical because they come from voices

b. Singing is music; shouting is noise

c. Both are noise because they involve multiple voices

d. Singing is noise; shouting is music

79 / 100

Category: Noise: Unpleasant, irregular sounds

79. A city plans to reduce noise pollution in its residential areas. Which of the following measures would be most effective in achieving this goal?

a. Increasing the number of vehicles on the road

b. Building more factories near residential areas

c. Planting trees along the roads

d. Encouraging construction activities in residential zones

80 / 100

Category: Music: Pleasant, rhythmic sounds

80. What part of a Veena vibrates to produce sound?

a. Stretched membrane

b. Stretched string

c. Hollow coconut shell

d. Earthen pot

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. Which of the following frequencies is within the audible range for humans?

a. 10 Hz

b. 1000 Hz

c. 25,000 Hz

d. 5 Hz

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) Television at high volume is a source of noise pollution in homes.
(R) Noise pollution can cause health problems like hypertension and anxiety.

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. Continuous exposure to loud noise can lead to which of the following health issues?

a. Hypertension

b. Anxiety

c. Hearing impairment

d. Diabetes

86 / 100

Category: Home appliances (TV, loudspeakers)

86. If the sound level of a kitchen appliance is reduced by 20\%, what will be the new sound level if it was originally 80 dB?

a. 64 dB

b. 76 dB

c. 78 dB

d. 80 dB

87 / 100

Category: Effects of Noise Pollution

87. (A) Continuous exposure to loud noise can lead to permanent hearing impairment.
(R) Noise pollution causes damage to the auditory system by affecting the delicate structures of the inner ear.

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.

88 / 100

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

88. What is a potential long-term effect of continuous exposure to high levels of noise pollution on cardiovascular health?

a. Reduced heart rate

b. Increased risk of hypertension

c. Decreased cholesterol levels

d. Improved blood circulation

89 / 100

Category: Measures to Control Noise Pollution

89. What is a recommended method to reduce noise pollution caused by transport vehicles?

a. Increasing the speed of transport vehicles

b. Installing silencing devices in vehicle engines

c. Removing all soundproofing materials from vehicles

d. Allowing unrestricted use of horns

90 / 100

Category: Use of silencers in vehicles

90. Which of the following is a primary function of a silencer in vehicles?

a. Reduce fuel consumption

b. Increase engine power

c. Minimize noise emission

d. Improve air conditioning efficiency

91 / 100

Category: Plantation of trees

91. How do trees help in controlling noise pollution?

a. By increasing the frequency of sound waves

b. By absorbing, deflecting, and refracting sound waves

c. By producing more oxygen

d. By blocking sunlight

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) Continuous exposure to loud sounds can lead to permanent hearing impairment.
(R) Loud sounds can damage the eardrum and the inner ear structures responsible for hearing.

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.

95 / 100

Category: Congenital deafness

95. What is the primary cause of total hearing impairment that is present from birth?

a. Genetic factors

b. Disease or injury

c. Age-related issues

d. Environmental noise

96 / 100

Category: Damage due to disease or injury

96. (A) Continuous exposure to loud noise can lead to permanent hearing impairment.
(R) Loud noise damages the delicate hair cells in the inner ear that are responsible for converting sound waves into electrical signals.

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. What is the primary purpose of cochlear implants for individuals with hearing impairment?

a. To amplify sound

b. To provide visual cues

c. To stimulate the auditory nerve

d. To improve speech without hearing

98 / 100

Category: Hearing aids, sign language

98. (A) Technological devices like hearing aids and cochlear implants can completely restore normal hearing for individuals with total hearing impairment.
(R) Total hearing impairment is usually congenital and cannot be fully corrected by technological devices.

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.

99 / 100

Category: Social Awareness

99. A child with partial hearing impairment may face challenges in speech development due to the direct relationship between hearing and speech. Which of the following strategies would be most effective in improving their communication skills?

a. Learning sign language and using hearing aids

b. Increasing the volume of spoken language

c. Focusing only on lip-reading techniques

d. Avoiding social interactions to reduce stress

100 / 100

Category: Helping hearing-impaired individuals integrate into society

100. (A) Learning sign language can help hearing-impaired children communicate effectively.
(R) Speech development is directly linked to hearing, and hearing-impaired children may have defective speech.

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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