Ans : Mercury.
Ans : Eight parts, called prahars. The Hindi word 'dupahar', for noon, is derived from 'du' (two) and pahar (prahar).
Ans : Aryabhatta
Ans : Council of Scientific and Industrial Research
Ans : Allium Cepa
Ans : Eucalyptus leaves.
Ans : Earth
Ans : CaCO3
Ans : They emit sounds of low intensity, which are reflected from the objects around them. This helps the bats to move about.
Ans : Max Plonck
Ans : Antoine Lavoisier.
Ans : Gregor Johann Mendel
Ans : Crescograph.
Ans : Gadolinium
Ans : Benjamin Franklin of USA.
Ans : The time rate at which the velocity of a point is changing is acceleration. Velocity is just the speed (miles per hour or kilometres per second). The term acceleration is used when the speed keeps increasing. The term deceleration is used when the speed becomes less and less.
Ans : Hans Christian Oersted.
Ans : By their smell.
Ans : Because helium is very light and does not burn.
Ans : Robert Koch, a famous German physician.
Ans : They don't have knees on their hind legs.
Ans : Usually five.
Ans : 1945
Ans : Anders Celsius first proposed the centigrade thermometer, which has a scale of 100 degrees separating the boiling and freezing points of water.
Ans : An element is a substance that cannot be broken down or decomposed into smaller parts by ordinary chemical means.
Ans : Bismuth
Ans : Rubber grows only in tropical countries.
Ans : On their legs they may carry millions of germs. When they rest on a food plate, these may be transferred to the object they rest on.
Ans : Roots that grow down from the branch of a tree. The banyan tree is a good example.
Ans : The atmospheric pressure at high altitudes is much lower than at sea level. The greater the pressure, the faster the cooking.
Ans : When a body is treated in such a way that it is preserved from decay, it is called embalming.
Ans : Because the plover birds enter the mouth of the crocodile and eat tit-bits found there. This helps the crocodiles to improve their oral hygiene. Therefore crocodiles do not harm the plover birds.
Ans : C12H22O11
Ans : Aluminium.
Ans : Metals are good conductors of heat. When we touch a metallic rod, it takes away the heat from the hand and feels cooler. A piece of wood is a bad conductor of heat and therefore it does not take away the heat from our hands.
Ans : Unlike human beings, whose growth stops around 20 years, snakes keep on growing. This becomes possible because they keep casting off old skin and develop new skin, when the old one is shed.
Ans : To force more tender leaves to branch out and make handpicking of leaves easier.
Ans : Refraction
Ans : Nicolus Copernicus (Bhaskaracharya of lllh Century A.D and Aryabhata of the fifth century A.D seem to be aware of this).
Ans : It is the minimum initial velocity required for an object to escape the gravitational attraction of an astronomical body, and to continue travelling away from it without the use of further effort.
Ans : Reptiles
Ans : John H.Glen
Ans : To digest its food.
Ans : About 150 million kilometres.
Ans : Acron
Ans : Sodium Bicarbonate.
Ans : Androphobia
Ans : Archimedes
Ans : The fuse is a strip of metal (or metallic wires) that melts at a relatively low temperature. When an electric circuit carries more electric current than it is supposed to carry, the fuse melts and prevents fires.
Ans : Poisons
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