Combustion & Flame

Name the most common fire extinguisher.

(a)  

What is the unit for expressing the calorific value of a fuel?

(a)  

Which of the following fuels is used for running automobiles?

• (a) CNG

• (b) Petrol

• (c) Both (a) and (b)

• (d) Wood

Magnesium burns to form

• (a) calcium carbonate

• (b) magnesium oxide

• (c) calcium oxide

• (d) magnesium sulphate

Name the chemical process in which a substance reacts with oxygen to give out heat.

• (a) Reaction

• (b) Junction

• (c) Combustion

• (d) All of these

Combustible substances are also known as

• (a) inflammable

• (b) flaming

• (c) illuminous

• (d) non-flammable

In the sun, light and heat are produced by

• (a) chemical reactions

• (b) nuclear reactions

• (c) burning reactions

• (d) bunsen burner

Lowest temperature at which a substance catches fire is known as

• (a) lowest temperature

• (b) burning temperature

• (c) ignition temperature

• (d) flaming temperature

Which of the following are required essentially for producing fire?

• (a) Glass, coal, water

• (b) Fuel, coal, straw

• (c) Fire, wood, burner

• (d) Fuel, air, heat

LPG means

• (a) Liquefied Petroleum Gas

• (b) Liquefied Petrol Gas

• (c) Liquid Petrol Godown

• (d) Liquid Petroleum Gas