COMBUSTION AND FLAME

Coal burns with__________

• Flame

• Only Glow

• Both flame & glow

• None of these

Combustion is a ____________

• Physical process

• Chemical process

• Both of these processes

• None of these

CNG & LPG are examples of

• Solid fuels

• Liquid fuels

• Gaseous fuels

• They are not fuels

There are following zones of flame

• Two

• Four

• Three

• No zone

The substance which have very low ignition temperature will

• Catch fire easily

• Will not catch fire

• Catch fire after sometime

• None of these

Burning of charcoal in room will produce

• Carbon dioxide

• Nitrogen dioxide

• Carbon monoxide

• All of these

Substance which catch fire are called

• Acids

• Bases

• Burners

• Combustible

The amount of heat energy produced on complete combustion of 1 kg of fuel is called

• Calorific value

• Significant value

• Heat value

• Internal value

Which is non combustible substance?

• Wood

• Paper

• Straw

• Iron nails

Essential requirements for producing fire are

• Fuel

• Air

• Heat

• All of these