Combustion and flame

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What is the unit of calorific value of fuel?

• Joule

• Kilogram

• Kilojoule per kilogram

• Kilogram per second

Which among the following is a combustible substance?

• Wood

• Glass

• Cement

• Water

Which of the following does not blame with flame?

• Camphor

• LPG

• Candle

• Charcoal

Which among the following zones of a candle flame is the hottest zone?

• Innermost zone

• Middle zone

• Outer zone

• All of the above

Which of the following is not used to extinguish fire from electrical equipment?

• Sand

• Water

• carbondioxide fire extinguisher

• None of these

magnesium combine with oxygen gives _____

The lowest temperature at which a substance catch fire and starts burning is known as ____

Ignition temperature is also called as _____ temperature

A substance cannot catch fire if its temperature is _____ than its ignition temperature.