Combustion & Flame - Grade 8 ANNUAL EXAM

The most common supporter of combustion is _____________.

The minimum temperature up to which a substance should be heated before it can catch fire - _____________.

The gas which is known as green house gas - _____________.

Another term of burning of a substance - _____________.

Substances which burn or catch fire easily - _____________.

The substances which have very low ignition temperature will

• Catch fire easily

• Will not catch fire

• Catch fire after some time

• None of these

Which one of the following is combustible?

• Iron nail

• Glass

• Stone pieces

• Paper

Which is the hottest part in the candle flame?

• Yellow

• Wax part

• Black

• Blue

Fuel may be

• Solid

• Liquid

• Gas

• All of the three

CNG and LPG are the examples of

• Solid fuels

• Liquid fuels

• Gaseous fuels

• They are not fuels