Assertion: It is not possible for a system, unaided by an external agency to transfer heat from a body at lower temperature to another body at a higher temperature.

Reason: It is not possible to violate the second law of thermodynamics

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

In a cyclic process, work done by the system is

• zero

• more than the heat given to the system

• equal to heat given to the system

• independent of heat given to system

143.

Ina cylinder their are 60 g Ne and 64 g O₂, If pressure of mixture of gases in cylinder is 30 bar then in this cylinder partial pressure of O₂ is (in bar)

• 30

• 20

• 15

• 12

A gas mixture contain one mole O₂ gas and one mole He gas. Find the ratio of specific heat at constant pressure to that at constant volume of the gaseous mixture

• 2

• 1.5

• 2.5

• 4

One mole of oxygen of volume 1 litre at 4 atm pressure lo attains 1 atm pressure by result of isothermal expansion. Find work done by the gas.

• ≈ 155 J

• ≈ 206 J

• ≈ 355 J

• ≈ 552 J

Graph of specific heat at constant volume for a monoatomic gas is

Which of the following is not a state function?

• Work-done in adiabatic process.

• Work done in isothermal process.

• Heat at constant pressure.

• Heat at constant volume.

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C_P and  C_V respectively.  If  $\mathrm{\gamma } = \frac{{\mathrm{C}}_{\mathrm{P}}}{{\mathrm{C}}_{\mathrm{V}}}$ and R is then C_V universal gas constant, then C_V is equal to

• $\frac{\mathrm{\gamma } - 1}{\mathrm{R}}$

• γR

• $\frac{1 + \mathrm{\gamma }}{1 - \mathrm{\gamma }}$

• $\frac{\mathrm{R}}{\left(\mathrm{\gamma } - 1\right)}$

Conversion of water to steam is accompanied by which process?

• Adiabatic

• Isothermal

• Isochoric

• Cyclic

An ideal gas is taken through the cycle A → B → C → A, as shown in figure. If the net heat supplied to the gas in the cycle is  5 J  the work done by the gas in the process A → B is

• 2 J

• 3 J

• 4 J

• 5 J