Thermodynamics ...

Conversion of water to steam is accompanied by which process?

Figure below shows two paths that may be taken by a gas to go from a state $$A$$ to a state $$c$$.
In process $$AB, 400\ J$$ of heat is added to the system and in process $$BC, 100\ J$$ of heat is added to the system. The heat absorbed by the system in the process $$AC$$ will be

The thermal motion means

In the free expansion of an ideal gas, its internal energy

Zeroth law of thermodynamics gives the concept of

The energy taken by system is $$\delta Q$$, work done by system is $$\delta W $$ and increase in internal energy is $$dU$$, the quantity which does not depend on path is :

A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone :

System A is in thermal equilibrium with B and B is separately in thermal equilibrium with C. Then A and C are in thermal equilibrium, from which law of thermodynamics it follows? 

The bullet fired from a gun gets heated on striking a target because

In which of the process the internal energy of the system remains constant ?