combustion and fuels

Coal burns with ______

• (a) Flame

• (b) Only glow

• (c) Both flame and glow

• (d) None of these

The substances which have very low ignition temperature will

• (a) Catch fire easily

• (b) Will not catch fire

• (c) Catch fire after some time

• (d) None of these

The products of combustion are

• (a) Carbon dioxide and water

• (b) Oxygen and water

• (c) Only carbon dioxide

• (d) Only oxygen

Water cannot be used as a fire extinguisher to put out.

• (a) Burning charcoal

• (b) Burning oil

• (c) Burning paper

• (d) Burning cloth

Burning of charcoal in a closed room will produce

• (a)Carbon dioxide

• (b)Nitrogen dioxide

• (c)Carbon Monoxide

• (d)All of these

CNG and LPG are the examples of

• (a) Solid fuels

• (b) Liquid fuels

• (c) Gaseous fuels

• (d) They are not fuels

Ignition temperature is

• (a) Lowest temperature at catch fire

• (b) Higher temperature at catch fire

• (c) Any temperature

• (d) None of these

Which of the following substance is non-combustible

• (a) Wood

• (b) Biogas

• (c) Kerosene oil

• (d) A piece of stone

Which of the following substances not required for combustion?

• (a) Oxygen

• (b) Carbon Dioxide

• (c) Fuel

• (d) Heat

The substance that catches fire spontaneously in presence of air, at room temperature is

• (a) White phosphorous

• (b) Rhombic Sulphur

• (c) Calcium

• (d) Iron