Questions and Answers of Science and Technology.
microphone is a device which converts sound waves into electrical signals. These signals can then be broadcast through the air or sent over to distant points, where they can again be converted back into sound. Microphone can be divided into two groups depanding upon how they respond to sound waves….. [… More info ..]
The term LPG Liquified Petroleum Gas. LPG is commonly used for domestic cooking purpose. It is supplied in gas cylinders that need to be replaced when their fuel contents are consumed. The supply in gas cylinders contains a mixture of liquified butane and iso-butane under pressure….. [… More info ..]
For thousands of years many scientists groped in dark to understand the true nature of light. The ancient Greeks belived that light consisted of rays of matter given out by whatever object was being looked at. Plato and his followers belived that it was a mixture of different matters coming from the sun….. [… More info ..]
Liquid crystals are of two types: thermotropic liqid crystals prepared by heating the substance and lyotropic liquid crystal made by mising two or more compounds. Some of the imporatant liquid crystals that belong to the first category are p-azoxyanisole cholesteryl nonanoate and p-n octyloxybenzoic acid….. [… More info ..]
All men women and children, who have weak eye-sight, use spectacles. Scientist have developed spectacles that help in seeing both the near distant object clearly. The history of spectacles was started some 700 years ago….. [… More info ..]
Hardness is a characteristic property of the solid objects. It is measured by the resistance which the body offers to anything which tends to scratch it. The hardness of the various materials is measured either on the mohs scale or the knoop scale….. [… More info ..]
Wine is probably the first type of hard drink to have come into existence. Archaeological evidence suggests that wine making began in the middle-east over 10,000 years ago, and gradually spread westward to the mediterranean countries and finally into Europe…… [… More info ..]
Our earth reflects a lot of energy back into the atmosphere. But presence of heavy carbondioxide in the atmosphere prevents some of this heat escaping just as a glass or plastic sheet stops escaping heat from the so called “Greenhouse” used to protect groing plants….. [… More info ..]
Force is a physical quantity which when applied to a body tries to displace or displaces it. This quantity is equal to the product of the mass of the body and its acceleration. The unit for measuring force is Newton or Dyne…. [… More info ..]
A fire is basically a chemical reaction during which heat and light are produced. Three factors are necessary for a fire to start – Fuel oxygen or air and heat to raise the temperature of the fuel to its ignition temperature….. [… More info ..]
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