Category: Important Questions
How do the rockets go up in the air? Rockets use the principle of action and reaction to go up into the air. Hot gases produced as a result …
How do sun-screen lotions and creams protect us from the harmful effect of sun’s rays? UV rays in the sunlight can cause skin disorders and burns. This damage caused …
How can the friction be reduced? Friction is due to the roughness of surfaces. Friction can be reduced by making the surface smooth. This can be done by polishing, …
How was the tire discovered? Charred remains of wood and bones have been found from the caves showing that fire was known to man in the stone age. Probably …
How is ‘cake’ different from ‘pastry’? A Cake is a soft, sweet food usually made from flour, sugar, eggs, cherries, baking powder etc. It may or may not have …
How can the flies walk upside down on ceilings? Flies have padded claws on the under part of their feet. These pads secrete a sticky liquid due to which …
How does a cordless phone work? The cordless phone consists of two parts—the base unit plugged into a telephone line and secondly the cordless phone. Both of these have …
How do cellular phones work? In a cellular network system, the area covered is divided into cells. Each cell has its own transmitter & receiver (transceiver) and is connected …
