Question

A mercury pallet is trapped in a tube as shown in the figure. The tube is slowly heated to expel all mercury inside it (Isothermal condition). Heat given to the tube is ______.

(ρHg = 13.6 gm/cc, Atmospheric pressure = 10⁵ Pa, cross- section area of tube = 2 cm²)

 

पर्याय

• 1.145

• 2.136

• 3.125

• 4.145

Answer 1

A mercury pallet is trapped in a tube as shown in the figure. The tube is slowly heated to expel all mercury inside it (Isothermal condition). The heat given to the tube is 2.136.

Explanation:

`"W"_"gas" = -{"W"_{"gravity"} + "W"_{"external pressure"}}`

= `mgl + P_0lA` [m = mass of Hg pallet]

= 2.136 J

∴ ΔQ = ΔW

= 2.136 J