How is the exact carat of gold measured? Carat is the measure of purity of gold. Pure gold is of 24 carats. While for making ornaments, gold of 24 …
How is that information for weather forecasting obtained? Weather is constantly changeling in most parts of the world. Information like temperature, humidity, sunshine, air pressure, speed of wind and …
How does a radio work? Radio is the receiving end of the signals originating at distant radio stations. During a radio programme in the studio, the voices and music …
How is the speed of wind measured? The speed of wind can be measured by an Anemometer. The Beaufort system developed by Admiral Sir Francis Beaufort in 1805 judges …
How are meteorites dated? Meteorites are made up of Uranium rocks having radioactive atoms of Uranium and some non-radioactive atoms of lead. This Uranium is unstable and gradually decomposes …
How does a telephone work? The fascinating instrument, Telephone, was invented by Alexander Graham Bell in 1876. The Telephone transmits sound waves in the form of electric currents. The …
How is silk obtained from silk worms? Silkworms feed on mulberry leaves which are soft and juicy and ideal for their grazing. Well fed worms start spinning cocoons around …
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 …
