Combustion and Flame Quiz

A ________ process in which a substance reacts with ______ to give off heat is called combustion.

• combustion

• oxygen

When the cloths of a person catch ______, the person is covered with a ______ to extinguish fire.

• fire

• blanket

The ______ temperature at which a substance catches fire is called its ______.

• ignition

• flashpoint

The substances which have very ______ ignition temperature and can easily catch fire with a flame are called ______ substances.

• low

• flammable

The substances which vaporize during ______ give flame.

Two glass jars A and B filled with carbondioxide and oxygen gases respectively. In each jar a lighted candle is placed simultaneously. In which jar will be the candle remain lighted for a long time and why?

Joseph wants to boil water quickly in a test tube. On observing the different zones of the flame, he is not able to decide which zone of the flame will be best for boiling water quickly. Can you give proper suggestion to do this activity?

Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities?

You are provided with three watch glasses containing honey, petrol and mustard oil respectively. Suppose you bring a burning candle near these materials one by one. Which material will catch fire instantly and why?

Sanu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. Do you think this action was suitable? If yes why? If not why? In such a condition what should Sanu have done?