Category: Important Questions
Why are the satellite dishes large and curved? Since the signals received from the satellites are very weak, large curved dishes are used as collectors of these signals. They …
Why is the boiling point of a liquid lowered at high altitudes? A liquid boils when the (upward) pressure exerted by its vapours and the (downward) pressure exerted by …
Why does the sky appear red or orange in colour at sun-sets? At sunset, the sunlight has to travel a longer distance through the atmosphere before it reaches us. …
Why can’t Benzene be used as a thermometric liquid even though it is a more sensitive liquid than Mercury? Benzene can expand about six times more than Mercury for …
Why are unmanned spacecrafts sent into space? Many unmanned spacecrafts like Pioneer 10, Voyager 1, Voyager 2 etc. have been sent into space to study the parts of the …
Why are CDs preferred to other forms of recording? Sound information, recorded in CDs through digital coding is very accurate, free of noise and gives excellent sound quality. They …
Why is Charles Babbage known as the ‘Father of Computers’? Charles Babbage (1792-1891) was an English mathematician. He spent most of his life developing the two calculating machines—the Difference …
Why is an enlarged photograph not as clear as the smaller photograph? The clarity of the graphics depends upon the number of pixels per square inch. The more the …
