Fuel, Combustion and Flames

Fuels, Combustion and Flame Worksheet-1

1. Read the given statements and select the correct option.

Statement 1: Combustion is a chemical process in which a substance reacts with oxygen to give off heat and at times light.

Statement 2: Heat and light produced in sun are due to combustion.

(a) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1

(b) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

(c) Statement 1 is true and statement 2 is false

(d) Both statements 1 and 2 are false

Fuels, Combustion and Flame Worksheet-2

1. The inflammable substances are

(a) Hydrogen                                 (b) Phosphorus

(c) Water                                        (d) Coke

2. Why doesn't a matchstick burn by itself, even-though it is a combustible substance?

(a) It gets ignited due to the heat of friction.

(b) A combustible substance cannot catch fire below its ignition temperature.

(c) A combustible substance can catch fire below its ignition temperature.

Fuels, Combustion and Flame Worksheet-3

1. The fires can be of different origin, and hence different substances are used to extinguish them. Water cannot be used as fire extinguisher to put out:

(a) burning wood                         (b) burning oil

(c) burning cloth                          (d) burning charcoal

2. Which type of fire extinguisher is used to extinguish fire caused by burning oil and petrol?

(a) Foam type                                (b) Water type

(c) Soda acid type                         (d) CCl₄ type