## An ideal gas expands in such a manner that its pressure and volume can be related by equation PV²=constant…

Q: An ideal gas expands in such a manner that its pressure and volume can be related by equation PV²=constant. During this process, the gas is

(a) heated

(b) cooled

(c) neither heated nor cooled

(d) first heated and then cooled

Ans: (b)

## If 2 moles of diatomic gas and 1 mole of monatomic gas are mixed, then the ratio of specific heats…

Q: If 2 moles of diatomic gas and 1 mole of monatomic gas are mixed, then the ratio of specific heats for the mixture is

(a) 7/3

(b) 5/4

(c) 19/13

(d) 15/19

Ans: (c)

## A gas is heated at a constant pressure. The fraction of heat supplied used for external work …

Q: A gas is heated at a constant pressure. The fraction of heat supplied used for external work is

(a) $\displaystyle \frac{1}{\gamma}$

(b) $\displaystyle (1-\frac{1}{\gamma})$

(c) $\displaystyle \gamma - 1$

(d) $\displaystyle (1-\frac{1}{\gamma^2})$

Ans: (b)

## The capacity of a vessel is 3L. It contains 6 g oxygen, 8 g nitrogen and 5g CO2 mixture at 27°C…

Q: The capacity of a vessel is 3L. It contains 6 g oxygen, 8 g nitrogen and 5g CO2 mixture at 27°C. If R=8.31J/mol K, then the pressure in the vessel in N/m2 will be (approx.)

(a) 5 × 105

(b) 5 × 104

(c) 106

(d) 105

Ans: (a)

## Air is filled at 60°C in a vessel of open mouth. The vessel is heated to a temperature T so that…

Q: Air is filled at 60°C in a vessel of open mouth. The vessel is heated to a temperature T so that 1/4th part of air escapes. Assuming the volume of vessel remaining constant, the value of T is

(a) 80°C

(b) 444°C

(c) 333°C

(d) 171°C

Ans: (d)