combustion and flame grade 8

Burning of charcoal in a closed room will produce

• Carbon dioxide

• Nitrogen dioxide

• Carbon monoxide

• Sulphur dioxide

Tags

NGSS.MS-PS1-5

The substances which have very low ignition temperature will

• Catch fire easily

• Will not catch fire

• Catch fire after some time

• None of these

Combustion is a reaction in which a substance reacts with

• hydrogen

• Nitrogen

• Oxygen

• Chlorine

Tags

NGSS.MS-PS1-2

Water cannot be used as a fire extinguisher to put out

• Burning coal

• Electrical fires

• Burning wood

• Forest fires

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

• Potassium chlorate

• Phosphorus

• Potassium

• Graphite

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

Tags

NGSS.MS-PS1-2

The least hot zone of a candle flame is

• non-lumious zone

• luminous

• dark zone

• blue zone at the base of the wick

Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?

• Water
• Carbon Dioxide 
• Dry Chemical
• Foam

The products of combustion of a hydrocarbon are:

• hydrogen + oxygen
• carbon dioxide + water
• carbon dioxide + hydrogen
• carbon + water

Tags

NGSS.MS-PS1-2

Moderately hot zone in a candle flame

• outer zone

• middle zone

• innermost zone

• wax candle