The SI unit of heat is _______.A.JouleB.KilojouleC.Both a and bD.None of these

The correct answer is A. Joule.

Explanation:
Definition of Heat: Heat is a form of energy that is transferred between systems or objects with different temperatures (from a higher temperature to a lower temperature).

SI Unit: The International System of Units (SI) defines the unit of energy as the Joule (J). Therefore, heat is measured in Joules.

Kilojoule: While kilojoule (kJ) is a common unit used in practical contexts (1 kilojoule = 1000 joules), it is a derived unit based on the joule. Hence, it is not considered a fundamental SI unit of heat.

Conclusion: Since the SI unit of heat is defined as the joule, option A is the most accurate answer. Option B (kilojoule) is correct in a practical sense but does not answer the question about the SI unit specifically.

Thus, the answer is A. Joule.