Fuels and Types of Combustion MCQs

1. Which of the following is considered a fossil fuel?
(A) Natural gas
(B) Hydrogen
(C) Ethanol
(D) Biomass

2. What is combustion?
(A) Mixing of two gases
(B) A type of evaporation
(C) A chemical reaction with oxygen releasing heat
(D) The condensation of fuel

3. Which of the following is an example of a renewable fuel?
(A) Coal
(B) Petrol
(C) Natural gas
(D) Biodiesel

4. What is required for combustion to take place?
(A) Light and fuel
(B) Water and fuel
(C) Fuel, heat, and oxygen
(D) Air and hydrogen

5. Which type of combustion occurs at a high temperature and produces a flame?
(A) Rapid combustion
(B) Incomplete combustion
(C) Complete combustion
(D) Spontaneous combustion

6. What is a major pollutant produced during incomplete combustion?
(A) Carbon dioxide
(B) Oxygen
(C) Carbon monoxide
(D) Nitrogen

7. Which fuel has the highest calorific value among the following?
(A) Wood
(B) Coal
(C) Kerosene
(D) Hydrogen

8. Spontaneous combustion is a type of combustion that:
(A) Occurs with an external flame
(B) Happens without apparent cause or ignition
(C) Occurs only in oxygen-free environments
(D) Requires water to start

9. Which of these is a characteristic of a good fuel?
(A) High moisture content
(B) Low calorific value
(C) Produces harmful gases
(D) Burns easily with a controlled flame

10. The fuel used in domestic gas cylinders is:
(A) CNG
(B) LPG
(C) LNG
(D) Coal gas