The reading of a barometer containing some air above the mercury column is 73cm while that of a correct one is 76 cm. If the tube of the faulty barometer is pushed down into mercury until volume of air in it is reduced to half, the reading shown by it will be

A liquid drop at temperature t, isolated from its surroundings, breaks into a number of droplets. The temperature of the droplets will be

A closed vessel is half filled with water. There is a hole near the top of the vessel and air is pumped out from this hole