Ans : The mineral, Pitchblende.
Ans : Palaeontology.
Ans : Because he supported the Copernican theory that the planets (including the earth) revolve around the sun.
Ans : Birds eggs
Ans : In nature, there are moulds and bacteria that attack other organisms in order to obtain nourishment and to reproduce. Antibiotics are chemical substances produced by organisms (usually microorganisms) that are harmful to other bacteria and life forms. If you moisten a piece of stale bread and keep it in the open, there will be a greenish growth on it a little later. That is because of the spread of a mould called Penicillium Notatum. It produces penicillin. Penicillin is a highly effective antibiotic. Most bacteria double every half an hour. Just one bacterium (singular of bacteria) becomes thousands within a few hours. An antibiotic does not permit the multiplication of bacteria. In many cases, the antibiotic does not permit even the survival of bacteria.
Ans : At the bottom of the nest.
Ans : To keep cool and protect itself from insect bites.
Ans : Mumbai
Ans : Aryabhatta
Ans : Insects
Ans : Sir Humphry Davy.
Ans : Hydrochloric Acid
Ans : Nowhere else. As we know it.
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 : Photosynthesis is the word used for making food from carbon dioxide in the air and water from the soil, in the presence of sunlight. It occurs in plants.
Ans : The reaction where heat is produced because of the fission (division) of a nucleus is called nuclear fission. The reaction in which heat is produced because of the fusion of two nuclei is called nuclear fission. In hydrogen bomb die reaction was due to nuclear fusion. In the atomic bomb dropped on Hiroshima and Nagasaki, it was a fusion bomb.
Ans : Habitat is the place where a certain animal or plant would live and grow naturally. Thus an ocean is the habitat of whales and a pond is the habitat of frogs.
Ans : Frederick Soddy
Ans : Phenol
Ans : Radio Detection and Ranging.
Ans : Gossipium Hirsutum
Ans : Tarapore Atomic Power Station
Ans : Euclid.
Ans : Inertia is the property of matter, which keeps a body at rest unless a force is exerted on it. Inertia also keeps a moving body in motion at the same speed and in the same direction unless a force is applied to stop this forward motion.
Ans : The planes leaving fume behind are jet planes. In a basic jet engine air is compressed and forced into a chamber, where fuel is added. Here combustion (burning) takes place. The hot gases that are produced escape from the base of the engine. This pushes the aircraft forward. The white fumes that you see are the hot gases as they escape out. Since the temperature around the jet is low, the fume condenses and becomes visible.
Ans : Human mind
Ans : Ampere.
Ans : Calcium.
Ans : James Dewar.
Ans : Lactic Acid is formed when the glycogen or sugar in the muscles is used. This makes us feel tired.
Ans : It is an instrument for measuring the pressure of gases.
Ans : A boat with twin parallel hulls. [From the Tamil words katta and maram, meaning tied up (katta) tree (maram).
Ans : The larynx is the voice box, located in the throat.
Ans : Frequency is defined as the number of vibrations per second. It must be noted that sound is caused as a result of vibrations in air columns or strings or objects. Sound travels in waves.
Ans : Vitamin-D.
Ans : When the eyes see an image, they hold onto it in the form of a visual memory for a fraction of a second after it is gone. In a motion picture, the projector flashes still pictures quickly in succession. The usual numbers of pictures that are projected per second are 24. Because of persistence of vision, the picture seems to be one continuous moving picture.
Ans : Joseph & Jacques Montgolfier.
Ans : In the presence of chlorophyll, a chemical reaction takes place in the leaves using carbon dioxide in the air and water transported from the roots. As a result of the chemical reaction, starch is produced. Oxygen is the by-product of this reaction.
Ans : Because helium is very light and does not burn.
Ans : Budha.
Ans : It is a body condition in which the temperature falls suddenly as a result of exposure to extreme cold.
Ans : Poisons
Ans : Kidneys.
Ans : They are rocks or pieces of rocks that enter the atmosphere and are usually burnt out before landing on earth. Some large meteorites can crash against the surface of the earth and cause damage.
Ans : The African elephant is much larger in size. Its ears as well as tusks are larger than those of an Indian elephant.
Ans : Ernest Swinton of Britain.
Ans : Toads have a dry warty skin while frogs have a smooth moist skin.
Ans : Earthworms also respire. They use their moist skin to exchange carbon dioxide for oxygen. The fishes use their gills to respire. Even frogs in the tadpole stage use their skin for respiring. Reptiles such as snakes and turtles and even birds breathe through lungs.
Ans : Ferdinand Von Zeppelin.
Ans : Rudolf Diesel.
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