One of the following is correct Absolute pressure = Atmospheric pressure - Gauge pressure b) - Gauge pressure=Absolute pressure + Atmospheric pressure c) - Absolute temperature may exist as a negative value d) - The mass in a control mass system constant.

(d)

Explanation:

Absolute pressure = Atmospheric pressure+Gauge pressure

hence from this equation we can clearly say that option (A) and (b) is not right.

absolute temperature cannot be negative.

so, option (d) is right.

according to law of mass conservation mass can neither be created nor be destroyed which define control mass i. e. mass in a control mass system is constant