2Nd 3Rd Law Of Thermodynamics

Identify which of the following is the correct option for free expansion of an ideal gas under adiabatic condition.
1.
2.
3.
4.

Under the isothermal condition, a gas at expands from to against a constant external pressure of 2 bar. The work done by the gas is:

1.		2.
3.		4.

For irreversible expansion of an ideal gas under isothermal conditions, the correct option is :

1. $∆\mathrm{U}=0,<mspace\; width="1em"></mspace>∆{\mathrm{S}}_{\mathrm{total}}\backslash neq0$

2. $∆\mathrm{U}\backslash neq0,<mspace\; width="1em"></mspace>∆{\mathrm{S}}_{\mathrm{total}}=0$

3. $∆\mathrm{U}=0,<mspace\; width="1em"></mspace>∆{\mathrm{S}}_{\mathrm{total}}=0$

4. $∆\mathrm{U}\backslash neq0,<mspace\; width="1em"></mspace>∆{\mathrm{S}}_{\mathrm{total}}\backslash neq0$

Which p-V curve among the following depicts the highest amount of work done?

1.		2.
3.		4.