Combustion and Flame

The substance which undergoes combustion is called

• Fuel

• Gel

• Oxygen

Respiration is a process of

• Fast combustion

• Slow combustion

• No combustion

The lowest temperature at which a substance starts burning and catches fire is called

• Boiling Point

• Ignition temperature

• Combustion temperature

• Lightning temperature

The substances which have very low ignition temperatures and can easily catch fire with a flame are called

• Non-inflammable substances

• Inflammable substances

• Combustible substances

• Non-combustible substances

Among the following which has the highest ignition temperature

• Kerosene

• CNG

• Coal

• Marble

The combustion reaction which happens on its own is called

• Rapid combustion

• Self combustion

• Spontaneous combustion

• Fast combustion

Burning of LPG in a gas stove is an example of

• Rapid combustion

• Self combustion

• Spontaneous combustion

• Explosive combustion

Which of the following burns without producing a flame?

• LPG

• Kerosene

• Coal

• Camphor

Blue flame is produced when

• oxygen supply is less

• oxygen supply is sufficient

Which zone of the flame is hottest?

• innermost

• middle

• outermost