Q. The numbers of chromosomes in human body is -
1) 42
2) 44
3) 46
4) 48
Q. The escape velocity of a rocket fired from the earth towards the moon is the velocity to get rid of the -
1) earth's gravitational pull
2) moon's gravitational pull
3) centripetal force due to earth's rotation
4) pressure of the atmosphere
Q. The chief constituent of gobar gas is -
1) ethane
2) methane
3) hydrogen
4) carbon dioxide
Q. What is the function of a dynamo?
1) To convert heat energy into light energy
2) To convert light energy into heat energy
3) To convert mechanical energy into electrical energy
4) To convert electrical energy into mechanical energy
Q. Which of the following acts as a resistance against disease in the body?
1) Carbohydrates
2) Red corpuscles
3) Vitamins
4) White corpuscles
Q. The chief purpose of crop rotation is to check the loss of topsoil -
1) by water erosion
2) by wind erosion
3) by weathering
4) of its mineral content
Q. All of the following are examples of chemical changes except the -
1) magnetizing of iron
2) rusting of iron
3) digestion of food
4) souring of milk
Q. The greatest value of bees to mankind is in -
1) supplying of food for birds
2) insuring pollination of certain crop plants
3) storing honey for man's use
4) furnishing beeswax needed in certain specialised industries
Q. The Rh factor refers to -
1) a protein substance found in the blood of some people
2) a hormone carried by the blood
3) the ratio of red corpuscles to white corpuscles in the blood
4) a process that speeds up the clotting of blood
Q. The reaction which converts sugar solution into alcohol is an example of -
1) saponification
2) hydrogenation
3) fermentation
4) hydrolysis
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