Question

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

• A. the food is not cooked completely.
• B. the fuel is not burning completely.
• C. the fuel is wet.
• D. the fuel is burning completely.

Answer 1

The correct option is B

the fuel is not burning completely.

Explanation for the correct option

(B) The fuel is not burning completely.

Incomplete combustion

• Incomplete combustion happens when there is insufficient oxygen, resulting in the formation of carbon monoxide.
• If the bottom of the vessel is getting blackened on the outside, it means that the fuel is not burning completely.

Explanation for the incorrect options

(A) If the food is not cooked completely, it means the supply of fuel is cut off or due to lack of enough oxygen, the flame of the burner gets off, etc.

(C) Water can corrode your fuel system and injectors, preventing them from correctly monitoring your fuel supply rate.

(D) Carbon dioxide $\left({\mathrm{CO}}_2\right)$ and water $\left({\mathrm{H}}_2\mathrm{O}\right)$ are produced in complete combustion.

Hence, the correct option is (B). The fuel is not burning completely.