COMBUSTION AND FLAME -2 VIIIA KVFW

Which of the following fuels is used for running automobiles?

• CNG
• PETROL
• BOTH A& B
• WOOD

Magnesium burns to form

• (a) calcium carbonate
• (b) magnesium oxide
• (c) calcium oxide
• (d) magnesium sulphate

Coal burns to produce

• (a) calcium bicarbonate
• (b) magnesium
• (c) carbon dioxide
• (d) oxygen

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

• REACTION
• JUNCTION
• COMBUSTION
• ALL OF THESE

The substance that undergoes combustion is said to be

• COMBUSTIBLE
• BURNING
• FLAME
• WAX

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 chemical is used in the rubbing surface provided for matchsticks?

• (a) Sulphur
• GOLD
• RED PHOSPHORUS
• WHITE PHOSPHORUS

Substances which have very low ignition temperature and can catch fire easily are called

• (a) flammable substances
• (b) inflammable substances
• (c) combustible substances
• (d) all of these