S1: dQ is heat supplied to the system, dU is change in internal energy and dW is work done on the system then according to first Law of thermodynamics. dQ = dU - DW
S2: First law of thermodynamics is based on conservation of energy.
(1) S1 is true, S2 is true and S2 is correct explanation of S1.
(2) S1 is true, S2 is true and S2 is not correct explanation of S1.
(3) S1 is false S2 is true.
(4) S1 and S2 both false.
