What is the unit of calorific value of a fuel?

Correct option is A

The correct answer is (a) kJ/kg.
· Calorific value (or heating value) of a fuel is a measure of the amount of energy released per unit mass of the fuel when it is completely burned. It indicates the energy content of the fuel and is commonly expressed in units of kilojoules per kilogram (kJ/kg). This unit quantifies how much heat energy is produced when a specific amount (per kilogram) of the fuel undergoes combustion.
Details on other options:
· J/kg K: This represents joules per kilogram per Kelvin.It is a unit used to measure specific heat capacity, which relates to the amount of heat required to raise the temperature of a substance by one degree Kelvin per unit mass.
· MJ/mg K: This represents megajoules per milligram per Kelvin.It is a highly uncommon and impractical unit for expressing calorific values, as it suggests energy per milligram (a very small mass unit) and per Kelvin (temperature unit).
· kW/mg:This represents kilowatts per milligram.Kilowatt (kW) is a unit of power, not energy content, and milligram (mg) is a unit of mass.