1) Human beings have pairs of chromosomes a) 24 b) 23 c) 46 d) 48 2) Process by which cell divide into two is called a) Mitosis b) Meiosis c) Fragmentation d) Regeneration 3) Calcium oxide is manufactured by heating a) Copper b) Carbondioxide c) Limestone d) Salt 4) Reaction involves an acid reacting with an alkali to form salt and water a) Neutralization b) Burning c) Decomposition d) Addition 5) Most commonly used barometer is a) Altimeter b) Aneroid barometer c) Torricelli barometer d) Magdeburg hemispheres 6) Ratio in which hydrogen and oxygen are present in water by volume a) 2:2 b) 1:1 c) 1:2 d) 2:1 7) Process does not involve a chemical reaction a) Digestion of food b) Burning of candle wax c) Melting of candle wax d) Fermantation 8) Chemical formula of magnesium oxide is a) MgO2 b) Mg2O c) MgO d) Mg(OH)2 9) It is an endothermic reaction a) Photosynthesis b) Combustion c) Respiration d) Burning 10) The transition of a substance from solid phase directly into gas phase is a) neutralization b) sublimation c) decomposition d) melting

Science 8

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