Category: Important Questions
How did Alexander Fleming discover penicillin Alexander Fleming discovered Penicillin, the first antibiotic by pure accident. One of his bacterial culture in the laboratory became contaminated with a …
How did cooking of food begin? Early man ate raw and uncooked food. The discovery that cooking makes food tastier and last longer must have coincided with the discovery …
How is the picture formed on a TV screen ? The T.V. antenna receives the radio waves, and passes it into the T.V. set. The screen of the set …
How does blood clot and a wound heal? Whenever an injury takes place in which bleeding occur, clotting and blood coagulation are initated to stop the bleeding. Clot formation …
How can the microbial infection be prevented? The microbial infection like cholera, food poisoning etc. can be prevented by keeping ca clean environment. Food containers and drinking water should …
How do the cows keep our planet warm? Till now, cows have been known as dairy animals providing us their nutritious milk besides other things. But they perform another …
How much does the atmosphere weight? The earth is surrounded by a thick blanket of air called the atmosphere. The atmosphere is a mixture of gases, water vapour and …
How are the astronauts trained for their space flights? Astronauts undergo a very special training before they go into space. To cope with the gravitational forces which are produced …
