A cup contains some mercury in it. Now a narrow glass tube is lowered in the mercury. After some time the mercury level in the tube becomes lower than the mercury level outside the tube as shown in diagram. During this process (Choose correct statements)

Options

A. Work done by atmospheric air on mercury is positve
B. Gravitational potential energy of mercury is decreased
C. Work done by atmospheric air on mercury is zero
D. Gravitational potential energy of mercury increases

Answer

C, D

Explanation

Interaction energy loss is conveted in G.P.E and heat losses