$\frac{{\mathrm{p}}_1{\mathrm{v}}_1-{\mathrm{p}}_2{\mathrm{v}}_2}{\mathrm{\gamma }+1}$

$\frac{{\mathrm{p}}_1{\mathrm{v}}_1-{\mathrm{p}}_2{\mathrm{v}}_2}{\gamma -1}$

$\frac{{\mathrm{mRT}}_1-{\mathrm{mRT}}_2}{\gamma +1}$

all of the above

${\mathrm{mC}}_{\mathrm{p}}\left({\mathrm{T}}_2-{\mathrm{T}}_1\right)$

${\mathrm{mC}}_{\mathrm{v}}\left({\mathrm{T}}_2-{\mathrm{T}}_1\right)$

${\mathrm{p}}_1{\mathrm{V}}_1\ln \frac{{\mathrm{V}}_2}{{\mathrm{V}}_1}$

Zero

net work can be produced during cycle without some heat supply

net work cannot be produced during cycle without some heat supply

net work cannot be produced during cycle with some heat supply

none of these

reversible process and closed system

any process and open system

any process and closed system

any process and any system

an engine having 100% efficiency

an engine fully reversible engine

a machine transfer heat from low temperature to high temperature

a machine that continuously creates its own energy

$\mathrm{Q}=∆\mathrm{E}+\mathrm{W}$

$\mathrm{Q}=∆\mathrm{U}+\mathrm{W}$

$\oint \delta Q = \oint \delta W$

All of these

1 Nm/J

1 J

1 J/m

1000 Nm/J

Kinetic energy

pressure energy

chemical energy

internal energy