5. A vessel containing 5 litres of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3 litres. The resultant pressure inside will be (assuming whole system to be isolated)

(a)  4/3 m                                 (b)  0.5 m (c)   2.0 m                                  (d)  3/4 m Ans. b (8)