46) A spherical aluminium ball is melted and made into smaller balls of 1/3 rd radius of original one. Then how many such balls can be made?

47) An alloy of weight 63 kg is made up of Copper, Zinc, and Tin metals by mixing in the ratio of 4:3:2 respectively. Then pick the correct weights (kg) of each metal in this alloy in a same order?

48) Weight of 75 cubic meter volume of metal is 150 gm. Then find the weight of 200 cubic meter volume of same metal

49) The friction force exerted by air on a moving body is called

50) A force of 300 N is applied at the end of spanner, whose effective length is 15 cm. Then find the torque applied?