Combustion and Flame

Which substance give heat and light after combustion

• Flame

• Fuel

• Combustion

• None of these

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

The substances which have very low ignition temperature will

• Catch fire easily

• Will not catch fire

• Catch fire after some time

• None of these

Ignition temperature is

• Lowest temperature at catch fire

• Higher temperature at catch fire

• Any temperature

• 100⁰ C

Combustion is a

• Natural process

• Chemical process

• Physical process

• None of these processes

When magnesium ribbon burnt it produce

• Magnesium hydroxide

• Magnesium oxide

• Magnesium chloride

• Magnesium sulphate

Which one of the following is combustible?

• Iron nail

• Glass

• Stone pieces

• Paper

Which of the following is inflammable Substances?

• Petrol

• Wood

• Paper

• Straw

In the presence of water, ignition Temperature of paper is-

• Decrease

• Increase

• Remain constant

• None of these