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Chemistry |
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| 151)Which one of the following is not an alloy? | |||
| brass | steel | ||
| copper | bronze | ||
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| 152)Which one of the following can be used as insecticide? | |||
| DDT | paracetamol | ||
| TNT | gunpowder | ||
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| 153)The ICs used in electronic devices are made up of | |||
| iron oxide | silicon | ||
| chromium | coal | ||
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| 154)The difference between explosion and combustion is that | |||
| combustion is accompanid by loss of heat while an explosion is accompanied by absorption of heat | combustion takes place only in air whele an explosion can occur even without air | ||
| combustion is a chemical reaction while an explosion is caused by physical factors | there is rapid increase of pressure in confined spaces in case of an explosion, but no such change occurs during combustion | ||
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| 155)In hospitals, the oxygen tubes for respiration contain oxygen and | |||
| helium | nitrogen | ||
| argon | carbon dioxide | ||
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| 156)Acetyl salicyclic acid is commonly used as | |||
| a fertilizer | a sedative | ||
| a pain killer | tear gas | ||
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| 157)The most commonly used substances in fluorescent tubes are | |||
| sodium vapour and neon | sodium oxide and argon | ||
| mercuric oxide and neon | mercury vapour and argon | ||
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| 158)Aluminium in the earth's crust is found as | |||
| gypsum | bauxite | ||
| cryolite | native metal | ||
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| 159)The commonly used medicine for typhoid is | |||
| ascorbic acid | chloromycetin | ||
| chloroquin | sulpha drugs | ||
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| 160)Radiocarbon dating is used to estimate the ages of | |||
| rocks | babies | ||
| fossils | ancient buildings | ||
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| 161)Ozone is important to mankind because it | |||
| creates a protective coverage against ultraviolet rays | releases oxygen in the air | ||
| maintains the temperature of the earth | absorb carbon dioxide | ||
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| 162)The gas in the atmosphere that helps in burning is | |||
| hydrogen | oxygen | ||
| nitrogen | carbon dioxide | ||
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| 163)Narmally the substances that fight against diseases in human are known as | |||
| enzymes | deoxyribonucleic acids | ||
| carbohydrates | antibodies | ||
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| 164)During dehydration the substance that is usully lost by the body is | |||
| sodium chloride | calcium phosphate | ||
| sugar | potassium chloride | ||
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| 165)Which one of the following is least prone to catch and spread fire? | |||
| terycot | cotton | ||
| nylon | polyester | ||
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