Science cbse 8th

Which of the following are combustible substance?

• Paper

• Stone

• Glass

• Plastic

For a fuel to burn, it must be heated to :

• To boiling point

• To its ignition temperature

• To the room temperature

Substances which have lower ignition temperature catch fire easily

• True

• False

Any substance that releases energy when burnt is called:

• Fuel

• Non-combustible substance

Sun produces heat and light due to ______________ reaction.

• Nuclear

• Solar

coal burns with _________

• flame

• only glow

• both a & b

• none 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

Supporter of combustion

• oxygen

• Carbon dioxide

• Nitrogen

Example of inflammable substance

• wood

• stone

• LPG

Ignition temperature is

• Lowest temperature at which a substance catches fire

• Highest temperature at which a substance catches fire

• Any temperature

• 100⁰ C