Question

Which among the following has the highest calorific value?

• A. Cowdung cake
• B. Wood
• C. Petrol
• D. Coal

Answer 1

The correct option is C Petrol

Calorific value is the amount of energy produced on the complete combustion of 1 kg of a fuel.

The calorific values of the given substances are mentioned below:
$$\begin{array}{cc}\text{Substance}& \text{Calorific value (J/kg)}\\ \text{Cow dung cake}& \text{6 x 10}{}^3\text{- 8 x 10}{}^3\\ \text{Wood}& \text{17 x 10}{}^6\text{- 22 x 10}{}^6\\ \text{Petrol}& \text{46.4 x 10}{}^6\\ \text{Coal}& \text{25 x 10}{}^6\text{- 33 x 10}{}^6\end{array}$$

The order of calorific values for the given substances are: petrol > coal > wood > cowdung cake

So, petrol has the highest calorific value among the given options.