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| 16)Cooking oil can be converted into vegetable ghee by the process of | |||
| crystallization | distillization | ||
| oxidation | hydrogenation | ||
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| 17)Iron articles rust because of the formation of | |||
| ferrus chloride | ferric chloride | ||
| sodium carbonate | a mixture of ferrus and ferric hydroxides | ||
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| 18)Diamond is chemically | |||
| a mixture of metal carbonates | a pure form of sand | ||
| pure carbon | a mixture of calcium and magnesium phosphates | ||
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| 19)Nitrogen in air | |||
| dilutes oxygen which, otherwise is very active in the pure form | is essential for our body | ||
| makes oxygen soluble in blood | decrease the density of air | ||
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| 20)Two solution are said to be isotonic when they | |||
| contains the same solute dissolved in them | have the same osmotic pressure | ||
| are of same concentration | have the same vapour pressure | ||
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| 21)Cooking gas supplied in cylinders by gas agencies is | |||
| gaseous | liquid | ||
| solid | a solution | ||
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| 22)Cooking gas is a mixture of | |||
| carbon monoxide and carbon dioxide | methane and ethylene | ||
| carbon dioxide and oxygen | butane and propane | ||
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| 23)Mica is a | |||
| good conductor of both heat and electricity | bad conductor of heat and good conductor of electricity | ||
| bad conductor of both heat and electricity | good conductor of heat and bad conductor of electricity | ||
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| 24)The gas inside an electric bulb is | |||
| air | oxygen | ||
| notrogen | carbon dioxide | ||
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| 25)The weight of a rusted iron object is _________ that of an unrusted one | |||
| appreciably more than | the same | ||
| less than | more or less the same as | ||
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| 26)The absolute zero of temperature is | |||
| the lowest temperature that is theoritically possible | the starting point of any scale of temperature | ||
| the temperature at which the vapour of all substances freeze | the temperature at which all substances exist in the vapour phase | ||
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| 27)During the burning of fuels, carbon and hydrogen present in the fuels are | |||
| absorbed by the surroundings | converted in alkanes | ||
| converted into carbon dioxide and water vapour | released into the atmosphere | ||
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| 28)The most abundant gas in the atmosphere is | |||
| helium | nitrogen | ||
| carbon dioxide | oxygen | ||
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| 29)In order to prevent the corrosion of iron pipes they are often coated with a layer zinc. This process is called | |||
| electroplating | annealing | ||
| vulcanization | galvanization | ||
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| 30)The main chemical substance present in the bone and teeth of animal is | |||
| calcium phosphate | calcium sulphate | ||
| sodium chloride | sodium carbonate | ||
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