Question

True or False?

a. A gas process that is not reversible can be drawn on a PV diagram

b. The work done by the gas is given by the integral of PdV for any reversible process.

c. The heat added to a system does not depend on the path taken or whether the process is reversible or not.

d. The internal energy of a system is only affected by heat and work.

e. In an isothermal process for an ideal gas, the internal energy is unchanged.

Answer 1

a. False, because for a process to be drawn on PV diagram, the process must be quasi-static which is not the case for non reversible processes .

b.True. The work done is given by integral of PdV for a reversible process.

C.False, Heat added is a path function,i.e., it depends on the path taken.

d.True.

U=Q-W where U is internal energy, Q is heat added and W is the work done by the gas.

So,internal energy depends only on heat added and work done.

e.True.For an ideal gas , internal energy depends on the temperature. So, if temperature is constant(isothermal process), internal energy does not change.