combustion and flame

Which substance give heat and light after combustion

• flame

• fuel

• combustion

• none of these

Like fuel the sun also provides heat and light. The process taking place in the sun is called

• combustion

• nuclear process

• burning

• all of these

The substances which have very low ignition temperature will

• catch fire easily

• will not catch fire

• catch fire after some time

• none of these

CNG and LPG are the examples of

• solid fuels

• liquid fuels

• gaseous fuels

• they aren't fuels

Coal burns with ____________________________

• Flame

• Only glow

• Both flame and glow

• None of these

Burning of charcoal in a closed room will produce

• Carbon dioxide

• Nitrogen dioxide

• Carbon monoxide

• Sulphur dioxide

Which of the following statement is false?

• Fossil fuels are preserved in the earth's curst.

• A good fuel should have high calorific value.

• Oxygen is a combustible gas.

• A substance burns in air, if its temperature is above the ignition temperature.

Combustion is a

• Natural process

• Chemical process

• Physical process

• None of these processes

Which one of the following is combustible?

• Iron nail

• Glass

• Stone pieces

• Paper

Which of the following is inflammable Substances?

• Petrol

• Wood

• Paper

• Straw