Question

Which of the following statements are true for fuels?

• A. All fuels release smoke when burnt.
• B. Some fuels release smoke when burnt.
• C. All fuels will finish in the future.
• D. All fuels burn to give heat energy.

Answer 1

Answer: (B), (D)

The correct options are
B Some fuels release smoke when burnt.
D All fuels burn to give heat energy.

All fuels burn and release heat energy which can be used for many purposes. Some fuels such as wood, coal, petrol, etc., release smoke when burnt. Other fuels such as LPG, CNG, biogas do not release smoke when burnt.