Question

Correct statement for First law of thermodynamics 
1. Total energy of system and surroundings remains constant 
2. Work done by the system equals to heat transferred by the system
3. Internal energy of a system remains constant during a process
4. Entropy of a system remains constant during a process. 

Answer 1

Correct Answer - Option 1 : Total energy of system and surroundings remains constant 

Explanation:

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The law of conservation of energy states that the total energy of an isolated system is constant. Energy can be transformed from one form to another but cannot be created or destroyed.

The first law is often formulated by stating that the change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings

δQ = ΔU + δW

ΔU = δQ - δW

According to the First Law of thermodynamics, “For a closed system undergoing a cycle, net heat transfer is equal to network transfer.”

ΣQ = ΣW.