COMBUSTION AND FLAME

Combustion is a reaction in which a substance reacts with

• hydrogen

• Nitrogen

• Oxygen

• Chlorine

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

• Combustion

• Nuclear Reaction

• Burning

• None of these

The substance which have very low ignition temperature will

• Catch fire easily

• Will not catch fire

• Catch fire after some time

• None of these

What is the main chemical component present in striking surface of a matchbox?

• Potassium chlorate

• Phosphorus

• Potassium

• Graphite

An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel?

• Compressed Natural Gas (CNG)

• Kerosene

• Petrol

• Coal

When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?

• Explosion

• Random combustion

• Rapid combustion

• Spontaneous combustion

Which of the following is inflammable Substances?

• Petrol

• Wood

• Paper

• Straw

Which is the hottest part in the flame of the candle

• Yellow

• Wax part

• Black

• Blue

Good fuel is

• Readily available

• Cheap

• Burn easily in air

• All of these

Ideal fuel has ____________ calorific value

• Zero

• Low

• Moderate

• High