Ans : It bounces off ultraviolet radiation.
Ans : New Delhi
Ans : To hold onto a surface.
Ans : Hydrochloric Acid
Ans : Iron Oxide.
Ans : Distillation is the process of converting a liquid into vapour form (by heating) and then cooling this vapour to recover the evaporated constituents by the process of condensation.
Ans : Photoelectric cells convert light into electricity. Selenium is used in making diese cells because its electrical conductivity increases when light strikes it and because it can convert light into electricity.
Ans : Hygrometer
Ans : A body whose mass is so intensely concentrated that even light cannot escape its gravitational attraction. Normal properties of space in its vicinity are altered drastically.
Ans : It is a device used for measuring rainfall.
Ans : Terrible lizard.
Ans : None.
Ans : Anaemia
Ans : Watt
Ans : Smog is a mixture of solid and liquid fog and smoke particles. Fog is formed when the humidity is high. The word smog is derived from smoke + fog.
Ans : Babylon (modern Iraq).
Ans : Poisons
Ans : EliasHoweofUSAin 1845.
Ans : Buried at the bottom of ponds.
Ans : When the combustion (burning) is not complete the colour of fire becomes yellowish. When the combustion is complete, the colour changes to pale blue.
Ans : Karl Landsteiner
Ans : Charles Darwin.
Ans : Johannes Kepler - Sir Isaac Newton later used these laws as the basis of his law of Universal Gravitation.
Ans : A mammal is a warm-blooded animal, which suckles its young ones with milk and has hair on its skin.
Ans : Acupressure.
Ans : The lower jaw.
Ans : Gregor Johann Mendel
Ans : Sweat glands are located under the skin of mammals. They are coils of soft, tiny tubes. The tube ends at openings in the skin called pores. Sweat glands carry moisture and waste material to the surface of the skin. When the water is brought to the surface of the skin it evaporates there and keeps the body cool.
Ans : A pearl is formed when a grain of sand or other foreign matter gets between the hard outer shell and the inner coat called the mantle, of a mollusc. The mollusc surrounds the irritation with nacre, a secretion from the mantle. Many thin layers of nacre give the pearl its lustre.
Ans : Rabies.
Ans : Samuel Colt
Ans : Galileo Galilei
Ans : Protozoa means the first animal. They are the simplest form of life. They are made of a single cell.
Ans : Kilowatt Hour.
Ans : Bamboo shoots and leaves.
Ans : Solanum melongenal
Ans : Liver and stomach.
Ans : Luna 2. It was launched on September 12, 1959 by the USSR.
Ans : They secrete the excess salt in die body through this action. They get rid of this by means of a gland near the comer of the eyes.
Ans : The process of hardening rubber by adding sulphur and heating the mixture is vulcanisation. Vulcanisation was discovered by Charles Goodyear. Raw rubber is sticky. It hardens when the temperature is low and softens when it is high. Charles Goodyear discovered that by combining raw rubber with sulphur and by heating it, the rubber becomes stronger and elastic and also resistant to solvents. Today almost all rubber, whether natural or synthetic is vulcanized.
Ans : Sound travels in the form of waves. The frequency of the waves and die amplitude (the width) of the waves determine the sound. The sound waves are of different kinds, when a train moves on solid ground, and when it moves on a bridge, whether made of steel or plain concrete.
Ans : Neil Armstrong.
Ans : Christopher Cockerell.
Ans : Orbit is the path of any body revolving around another body. This path can be circular or elliptical (as an ellipse).
Ans : Heating a mixture of limestone and clay.
Ans : Rohini Satellite (RSI).
Ans : Pecking order is an example of hierarchy among animals, particularly hens. In a coup containing hens and cocks, the seniormost cock can peck at all the other hens and cocks in the coup. A hen can peck at others weaker than it, but must permit pecking by senior members in the hierarchy.
Ans : Hydrocarbon
Ans : Allium Cepa
Ans : There is an unusual expansion of water, when its temperature goes below 4° C. Instead of contracting, the water begins to expand till ice is formed at zero degrees Celsius. Unable to bear the pressure, the pipe bursts.
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