1) I.The fuel with highest calorific value a) hydrogen b) petrol c) lpg d) none of the above 2) II. Seed drill is used for a) harvesting b) sowing c) adding manure d) eating food 3) III.The pitch of a sound depends on: a) its frequency b) its amplitude c) time period d) speed 4) IV.The decrease in pressure takes place when _____ a) a) The force is increased but not the area b) b) The area is decreased but not the force c) c) Either force increases or area decreases d) d) The area increases and the force decreases 5) . To sharpen the blade of a knife by rubbing it against a surface, which of the following will  a) stone b) plastic block

science class 8

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