General Knowledge
Ans : Five pairs.
Ans : Dr.Wallace H.Carothers
Ans : Altitude
Ans : Michael Faraday.
Ans : Ti
Ans : Spleen
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 : Bats produce screeching sounds. As these sounds strike objects around them, they produce echoes, which are heard by the bats. This helps the bats in navigation. Human beings cannot hear the sounds produced by the bats as they have much higher frequency than the audible range of the human ear.
Ans : Deep under the crust of the earth is molten rock or lava, also called magma. It is under great pressure because of the intense heat around it and the weight of the earth's crust. When this hot boiling mass finds an outlet in the underside of the earth's crust, it comes through the surface as lava.
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 : 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 : Sodium bicarbonate
Ans : It is estimated that the Milky Way has over a hundred billion stars. The sun is one of the stars in the Milky Way.
Ans : Christopher Eijkman - though he did not use the word, vitamin.
Ans : Ornithology.
Ans : Vitamin-D.
Ans : When tigers become old or are incapacitated because of injury, they prey on human beings. A tiger that has preyed on man and has tasted human flesh often continues to prey on man.
Ans : It is a body condition in which the temperature falls suddenly as a result of exposure to extreme cold.
Ans : That small particles of matter (molecules) are in constant motion was observed by Robert Brown through his microscope, by putting very fine powder in water. This movement of molecules is referred to as Brownian movement.
Ans : Polypnenols in the apple get oxidised.
Ans : Androphobia
Ans : In measuring distances on earth we use units like miles and kilometres. But even for giving the distance between the sun and the earth, we have to write 93,000,000 million miles or 150,000,000 kilometres. To write the distance between Alpha Centauri and earth we have to write long numbers. Hence measuring in units based on the speed of light has been adopted. In this scale the sun is 8 minutes from the earth. In kilometres one light year is approximately 924 x 1013 or 9,240,000,000,000,000 kilometres. Alpha Centauri is just 4.6 light years away.
Ans : Thomas Alva Edison
Ans : Parthenocarpic
Ans : Amino acids
Ans : The Gila Monster and the Beaded Lizard.
Ans : By rubbing its legs against one of its front wings.
Ans : Mumbai
Ans : Under side of leaves.
Ans : About a million.
Ans : If you wish to carry sand or any solid substance from one place to another, you can carry little if there are straight metal strips. A pail can carry much more. In the case of air, which is a fluid, a slightly curved blade is enough to help circulate air in the room.
Ans : Samuel Hahnemann.
Ans : 59 earth days.
Ans : John Logic Baird.
Ans : In 1903 for physics and in 1911 for chemistry.
Ans : Fossils
Ans : Charles Goodyear
Ans : Mammoth was an ancestor of the elephant (of the modern elephant), which is now extinct. Whole frozen mammoths have been found below the ice in Siberia.
Ans : Aluminium
Ans : Nowhere else. As we know it.
Ans : Mendelevium
Ans : The cause of filaria (elephant leg) are worms called Wuchereia bancrofti the female worm gives birth to young worms and not eggs. These young ones, called microfilaria, find the way into blood stream of their victims and from there into the lymphatic vessels. The immediate cause of filarial is a mosquito called culex.
Ans : By baking the tablets. This would remove the moisture from the tablets and harden them.
Ans : Aluminium.
Ans : Assyria and China.
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 : Charles Babbage.
Ans : Cosmic rays are radiation from outer space, which bombard the earth. They constantly strike the molecules of the earth's upper atmosphere. As a result, additional radiations are produced. The atmosphere absorbs most of these rays.
Ans : Outer casings of soft-bodied animals, called molluscs.
Ans : Histology
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