31.Copper wires are generally used for electrical power transmission instead of iron wires because

32.When ice melts into water, its

33.When an open bottle of scent is kept in a corner of the room, its odour is felt in all the corners. This is due to the phenomenon of

34.The founder of the technique of psychoanalysis was

35.Helium is preferred over nitrogen to be mixed with the oxygen in cylinders carried by divers because