Ans : Inside the sun a reaction similar to that of a hydrogen bomb goes on continuously. Two atoms of hydrogen fuse to produce an atom of helium. The sun is today at the midway of its life.
Ans : Heating, cooling, ventilation and dehumidifying are aspects of air-conditioning. It is believed that a cold climate with a low level of humidity is good for health. Even food is preserved better when the temperature and humidity are low.
Ans : Converting raw animal skin into leather.
Ans : Bamboo shoots and leaves.
Ans : Rubidium
Ans : Iron
Ans : Cholesterol is a fat found in the human body and the body of other large animals. In its pure form it looks like white sugar. It is made up of tiny crystals, which can be seen under a microscope. It is said that too much cholesterol in the blood is responsible for the hardening of arteries and for various other heart ailments.
Ans : Insectivorous plants
Ans : Four
Ans : Nowhere. It was last reported in Mauritius in 1681. Now it is extinct.
Ans : When milk is heated, the water in it starts evaporating. The fat globules present in the milk get separated and float on the top as cream. On further heating, more water vapour is formed. But when it tries to escape, it gets trapped by the thick layer of cream on the top. The water vapour pushes up the layer of cream and forms a bulge, which finally bursts out, causing the spill.
Ans : From their telescopes, astronomers could study objects in outer space that could not be seen with the naked eye. Radio telescopes are telescopes that can study long waves, which are not visible. They can do this using antenna, since radio waves are much longer than light waves. To be effective, radio telescope needs to be much larger than ordinary optical telescope,
Ans : Greenwich Meridian is an imaginary north-south line on the earth's surface drawn through Greenwich near London and both geographical North Pole and South Pole. This line has been arbitrarily chosen as the 0° longitude.
Ans : Fog is water vapour condensing near the surface of the earth. Fog differs from clouds in that fog is close to the earth and clouds are in the sky.
Ans : Saturn.
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 : Cockroach.
Ans : It is a chemical used to kill germs on the skin or in the wounds. It is also used on things people handle.
Ans : The electrocardiograph is an electrical instrument, which records the activity of the heart muscle. As the heart beats, several activities take place in a regular! order. The electrocardiograph records changes that occur in a regular order, during a complete heartbeat.
Ans : To digest its food.
Ans : Plaster of Paris
Ans : Forces acting on bodies at rest
Ans : Sound is produced by the movement of columns of air. Strike a stainless steel glass with a spoon. A sound is produced. Stop the vibration of the steel glass with your fingers. There will be no sound. When water is being filled in a vessel, sound is produced because of the movement of the column of air. This column becomes smaller and smaller as the water level rises in the vessel. Hence the sound changes.
Ans : Rohini Satellite (RSI).
Ans : G. Marconi.
Ans : Milky Way.
Ans : Charles Goodyear
Ans : Iron and Carbon.
Ans : Mercury
Ans : Dr.Wallace H.Carothers
Ans : Rabies.
Ans : Water filters down the surface of the ground and is absorbed and stored by soil and rocks in a zone of saturation. The top of this zone is called Water Table. During drought, the Water Table too goes down.
Ans : When a soap bubble forms and goes up in the air, it is subject to immense pressure from all sides. Only a spherical shape can withstand maximum pressure. That is why soap bubbles are always spherical.
Ans : The needle of the compass always points towards the magnetic north pole. This indicates the direction in which the ship is moving.
Ans : William Sturgeon
Ans : Christopher Eijkman - though he did not use the word, vitamin.
Ans : Spleen
Ans : From the fact that you have to watch it to know the time.
Ans : It throws out its tongue, which is sticky and catches the insects.
Ans : Conversion of a substance from solid state to vapour state (without the intervening liquid state) is sublimation. For example, iodine sublimates from its solid state to vapour.
Ans : Aluminium.
Ans : An alloy of copper and tin.
Ans : Parachute is nothing but a big umbrella made of a special fabric. The parachute and the person using it are subject to two forces: - 1) gravity, which brings them down and 2) the buoyant force of air, which pushes up the umbrella. If the force of the gravity is greater than the buoyancy, the parachute moves down, but very slowly. Hence men can reach the ground safely.
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 : Accidentally he spilled a mixture of rubber and sulphur on a hot stove. He observed that the rubber had become stronger and elastic. From there he got; the idea of hardening rubber.
Ans : William Stockes
Ans : Venus and Uranus.
Ans : Sulphuric Acid
Ans : Calcium.
Ans : Any of the three species of Fish, commonly referred to as four eyed fish. An anableps has the ability to see above and below the water at the same time.
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