More Interesting Reasons....
1. What is nuclear winter?
2. How is heat suddenly generated to the extent of 50,000 Fahrenheit during lightning?
3. How is the light produced when an object is burnt?
4. Diamond is a good thermal conductor. But it is an excellent electrical insulator. How?
5. What is the difference between dial up and broadband Internet connections?
6. When a lighted matchstick is shown before another light source, the shadow of the matchstick is formed on a screen but not the shadow of the flame. Why is it so?
7. Why are fishes not able to survive in distilled water?
8. Why do eggs become hard on boiling?
9. What is the powder like material found on the wings of butterflies? What is its use?
10. Why do our eyelashes and eyebrows never continue to gow unlike hair on our head?
11. Jackfruit is the only fruit that grows also from the tree trunk. What makes this possible?
12. How does one control the movement of hot air balloons?
13. How does remote control in TV work?
14. Why is the power of a loudspeaker expressed in watts?
15. What makes the earth rotate?
16. What is the difference between a sodium vapour lamp, Which gives out a yellowish colour illumination, and a mercury vapour lamp that gives out a white colour illumination?
17. Both Infrared and Microwave bands are invisible to the human eye. Then how are IR and microwave images from remote sensing satellites printed? How do they substitute the wavelenghts?
18. How does lightning affect TVs?
19. Soaps come in different colours. But why is soap's lather always white in colour?
20. Is the mosquito a carrier of AIDS causing virus?
21. Does the change in mother's food affect the baby?
22. What is Radio Therapy?
23. Since clouds contain tiny water droplets, why are rainbows not permanently present?
24. How does the solar wind affect Earth?
25. How do icebergs form?
26. Why is fire hot?
27. How is sex determined in dioecious plants?
28. How does the camel walk in the desert easily?
29. How can we test the purity of honey?
30. What is meant by ozonised mineral water?
31. Why do lips become dry during winter?
32. Why do houseflies rub their front legs together?
33. How does a lightning arrestor work?
34. Like ordinary paints do metallic paints also fade?
35. What is the difference between tv screen and computer monitor?
36. What is the pH of rainwater? Is the pH suitable for drinking?
37. In the past, why was injection administered in the stomach for dog bite?
38. How does scratching cure itching sensation?
39. Why does sea water not erode coastal areas in all places?
40. Do animals also have blood groups like humans?
41. What is Computer Simulation Technique?
42. How does Ballast-Less Track provide safe travel?
43. How do certain species of birds such as humming birds, terns, gulls and kestrels remain in the air without a forward motion?
44. How is carbon dioxide removed from blood before it is exhaled?
45. Why is the Earth's core hot? What caused it to heat up? Is it still heating, or now cooling?
46. Why does rain come in drops and not in a continuous stream?
47. What are polaroid sunglasses made of?
48. Why is the @ symbol used in an email address?
49. How does the solar wind affect Earth?
50. How do touch screens work?
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?
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Ali Baloch