When is the heat supplied to a system equal to the increase in its internal energy?

Is the heat supplied to a system always equal to the increase in its internal energy?

Is the heat supplied to a system always equal to the increase in its internal energy?

Assertion: The heat supplied to a system is always equal to the increase in its internal energy Reason: when a system changes from one thermal equilibrium to another, some heat is absorbed by it.

Assertion: The heat supplied to a system is always equal to the increase in its internal energy. Reason: When a system changes from one thermal equilibrium to another some heat is absorbed by it.

Assertion : First law of thermodynamics does not forbid flow of heat from lower temperature to higher temperature. Reason : Heat supplied to a system always equal to the increase in its internal energy.

Assertion : First law of thermodynamics does not forbid flow of heat from lower temperature to higher temperature. Reason : Heat supplied to a system always equal to the increase in its internal energy.

Find the external work done by the system in kcal, when 20 kcal of heat is supplied to the system the increase in th internal energy is 8400 J (J=4200J/kcal)