Question

The calorific value of fat is:

• A. less than that of carbohydrate and protein
• B. less than protein but more than carbohydrate
• C. less than carbohydrate but more than protein
• D. more than that of carbohydrate and protein

Answer 1

The correct option is D

more than that of carbohydrate and protein

Explanation for the correct option:

Option (d) more than that of carbohydrate and protein

• The amount of heat energy that is present in food or fuel, is determined by the complete combustion of a specified quantity that is occurring at constant pressure and in normal conditions is known as the Calorific value,
• The SI unit of calorific value is $\mathrm{kJ}{\mathrm{kg}}^{-1}$
• The calorific value of fat is more than that of carbohydrates and protein.
• Fats have more calorific value when compared to carbohydrates, protein, alcohols, roughage, and other biomolecules involved in the maintenance and metabolic processes.
• The efficiency of the food or fuel depends on its calorific value.
• If the calorific value of a substance is high, then it will also have high efficiency.
• If that same substance has a low calorific value, then it will also have low efficiency or we can also say that the calorific value is directly proportional to its efficiency.
• Hence it is the correct option.

Explanation for the incorrect option:

Option (a) less than that of carbohydrate and protein

• The calorific value of fat is not less than that of carbohydrate and protein.

Option (b) less than protein but more than carbohydrate

• The calorific value of fat is not less than protein but more than carbohydrate.

Option (c) less than carbohydrates but more than protein

• The calorific value of fat is not less than carbohydrates but more than protein

Hence, the correct option is D.