Combustion and Flame

Burning of coal and diesel releases an extremely suffocating and corrosive gas called:

• Hydrogen

• Sulphur dioxide

• Carbon dioxide

• Oxides of Nitrogen

For fires involving oil and petrol, which fire extinguisher will be suitable?

• Sodium Bicarbonate

• Water

• Carbon dioxide

• Carbon Monoxide

An ideal fuel is:

• Cheap, readily available

• having high calorific value

• All of these

• rapidly combustible

Explosion is a sudden chemical reaction that takes place with the evolution of a large amount of:

• Light

• Sound

• Gases

• Heat

Carbon fuels like wood, coal, petroleum release in burnt carbon particles dangerous pollutants causing respiratory problems.

• True

• False

Oxides of sulphur and dissolve in rainwater and form acid rains.

• True

• False

Carbon dioxide as fire extinguisher not only forms a blanket around the fire, it also brings down the temperature of the fuel.

• False

• True

An example of spontaneous combustion is cold dust, forest fire which is

• True

• False

Fuel efficiency is expressed in terms of its calorific value of kJ/kg

• False

• True

The substances like kerosene, oil and molten wax which vaporize during burning forms flames whereas charcoal does not vaporize, do does not produce flames.

• True

• False