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

coal burns with _________

• flame

• only glow

• both a & b

• none of these

Burning of charcoal in a closed room will produce

• carbon dioxide

• nitrogen dioxide

• carbon monoxide

• 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

ignition temperature is

• any temperature at which a substance catches fire

• highest temperature at which a substances catches fire

• lowest temperature at which a substance catches fire

what is combustion

• chemical process

• physical process

• none of these

• both a & b

the products of combustion are

• carbon dioxide

• oxygen & water

• water and fire

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