Sound Worksheet-13

Sound Worksheet-13

31. Which Characteristic of a vibrating body determines

(a) loudness

(b) Pitch of the sound produced by it.

32. Why do we hear the thunder a little after we see the flash of lightning?

33. Why do we not hear echoes in our ordinary surroundings?

34. We cannot hear the sound of the exploding meteors in the sky, though we can see then, Why?

35. We can hear the supersonic jet planes flying. How?

36. What are vocal cords? What is their function?

37. When does a thud become music?

38. How do birds and insects produce sound?

39. What is the function of Eustachian tube in human ear?

40. (a) In our body which part of the ear receives sound waves?

(b) What many happen if the ear drum is does not from our ear?

41. Can a hearing impaired child speak? If not why?

42. Give an example each of:

(a) Stringed instrument

(b) Percussion instrument

(c) Wind instrument

(d) Striking instrument

43. Can sound travel through water? How do whales communicate under water?

44. How is the pressure variation in a sound wave amplified in human ear?

45. How is that you can hear a friend talking in another room without seeing him?

46. What are infrasonic and ultrasonic waves?

47. Write any two measures to reduce noise pollution.

48. What are the effects of noise pollution?

49. How can the noise pollution be controlled in residential area?

50. Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer

51. What happens when we pluck the string of a Sitar?

52. Why is the voice of men, women and children different?

53. How are we able to hear sound?

54. What sources in the home may lead to noise?

55. Draw labeled diagram showing the structure of the human ear.

56. What is the function of : (a) External ear, (b) Internal ear

57. Give some suggestions by which we can keep our ears healthy.

58. Can you hear the sound on the moon? Explain

59. (a) What is SONAR?

(b) What is the basic principle of its working?

(c) Explain its use.

60. What is the use of ultrasound in medicine and industry?

61. What is a sonogram? Why is it preferred to X-rays?

62. (a) Name a property of sound which is

(i) Similar to the property of light

(ii) Different from that of light.

(b) Why do some people have hearing impairment? How do they communicate with others?

63. Describe how we are able to hear sound.