Class 8 Science Combustion

Which fuels are used for running automobiles?

• a. Wood

• b. Coal

• c. Diesel

• d. Charcoal

When magnesium ribbon burnt it produce

• a. Magnesium hydroxide

• b. Magnesium oxide

• c. Magnesium chloride

• d. Magnesium sulphate

. Charcoal burns in air producing-

• a. CO2

• b. CO

• c. H2

• d.O2

Combustion is a reaction in which a Substance reacts with-

• a. Hydrogen

• b. Nitrogen

• c. Oxygen

• d. Chlorine

Fuel may be-

• a. Solid

• b. Liquid

• c. Gas

• d. All of these

Which one of the following is fuel of our body?

• a. Petrol

• b. Diesel

• c. Food

• d. Water

Combustion is a-

• a. Physical process

• b. Chemical process

• c. Both (a) & (b)

• d. None of these

Which one of the following is combustible?

• a. Iron nail

• b. Glass

• c. Stone pieces

• d. Paper

The lowest temperature at which a Substance catches fire is called its-

• a. Boiling point

• b. Melting point

• c. Ignition temperature

• d. Critical temperature

. Which of the following has lower ignition temperature?

• a. Wood

• b. Paper

• c. Vegetable oil

• d. Kerosene oil