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51. Does frequent switching on/off of a fluorescent lamp reduce its life?

52. How is a ventriloquist able to throw his voice?

53. What is the peculiar smell of the earth after the first shower?

54. How does a rechargeable battery work? What is the life of such batteries and how are they different from ordinary batteries?

55. Why is fuel used in airplanes different from those used in motor vehicles?

56. Why does an egg (with the shell) burst when cooked in a microwave oven?

57. How does a compact fluorescent lamp consume less electricity than conventional fluorescent lamps and bulbs?

58. What causes milk to rise up when we boil it?

59. Why are we unable to see through a frosted glass?

60. Why does our mouth stink after a night's sleep despite brushing before going to sleep?

61. How does wheat flour become malleable and elastic when mixed with water?

62. How do raw mangoes and bananas become ripe when treated with chemicals?

63. What is the powdery deposit found on some fruits like grapes? What is its use?

64. How is the speed of a computer measured?

65. What is magnetic levitation? How does it work?

66. Why is it easier to tear wet paper and not dry paper?

67. How are some insects able to walk on the surface of water?

68. Why do wounds heal slowly in diabetics?

69. How do pharmaceutical companies arrive at expiry dates for medicines?

70. What is the difference between computer monitor and colour television?

71. How are snake pits formed?

72. How does a compact fluorescent lamp consume less electricity than conventional fluorescent lamps and bulbs?

73. Why does it take a longer time to copy a file to a computer than delete it?

74. A hen lays an egg every day. From where does it get the calcium required to make the eggshell?

75. Why do doctors prescribe some medicines to be taken before and some after food?

76. Why does a mushroom shaped cloud form after a nuclear bomb explosion?

77. Is sweat examined as a clinical sample like blood, urine and sputum?

78. Why do pregnant women like eating tamarind and raw mangoes?

79. Why does the reception of a transistor become clear when the antenna is touched?

80. Why are antibodies not produced against sperms by the female's immune system?

81. Why are we unable to walk straight and tend to lose our balance when we walk with our eyes closed?

82. Why are diesel driven vehicles noisy?

83. Why does a single cross hybrid give better yield compared to double cross hybrid?

84. Why does a battery operated transistor make noise when a nearby tube light is switched on?

85. Why do we see rainbow colours on a CD?