Question

9 The first law of thermodynamics may be written in he form
ΔU=ΔQ+ΔW
, where the symbols have their usual meaning. Which of the following is correct for the case of an isothermal expansion of an ideal gas?
ΔW>0
ΔW=0
ΔU=0
ΔU>0

10 Which statement about internal energy is correct
The internal energy of a system can be be increased without transfer of energy by heating
The internal energy depends only on its temperature
When the internal energy of a system is increased, its temperature always rises
When two system have the same internal energy, they must be at the same temperature