COMBUSTION AND FLAMES

Which substance give heat and light after combustion

• a. Flame

• b. Fuel

• c. Combustion

• d. None of these

Like fuel the sun also provides heat and light. The process taking place in the sun is called

• a. Combustion

• b. Nuclear process

• c. Burning

• d. All of these

Coal burns with ______

• a. Flame

• b. Only glow

• c. Both flame and glow

• d. None of these

Burning of charcoal in a closed room will produce

• a. Carbon dioxide

• b. Nitrogen dioxide

• c. Carbon monoxide

• d. All of these

The substances which have very low ignition temperature will

• a. Catch fire easily

• b. Will not catch fire

• c. Catch fire after some time

• d. None of these

CNG and LPG are the examples of

• a. Solid fuels

• b. Liquid fuels

• c. Gaseous fuels

• d. They are not fuels

Ignition temperature is

• a. Lowest temperature at catch fire

• b. Higher temperature at catch fire

• c. Any temperature

• d. None of these

Combustion is a

• a. Chemical process

• b. Physical process

• c. Both of these processes

• d. None of these processes

The products of combustion are

• a. Carbon dioxide and water

• b. Oxygen and water

• c. Only carbon dioxide

• d. Only oxygen

There are following zones of a flame

• a. Two

• b. Three

• c. Four

• d. No any zone