flame and combustion

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

Water is not used to control fires involving electrical appliances.

• False
• True

Which of the following fuel has highest calorific value?

• Wood
• coal
• Hydrogen
• petrol

Tags

NGSS.MS-PS3-4

What is produced when combustable substance is in the vapour state and burn strongly in the presence of of air?

• heat 
• light
• flame
• fumes

The three sides to the fire triangle are;

• Petrol, Spark, Oxygen
• Heat, Fuel, Oxygen
• Heat, Paper, Air
• Match, Paper, Air

8.7: Combustion is when a __________ reacts with oxygen

• petrol

• fuel

• fire triangle

• carbon dioxide

Which poisonous gas is formed as a result of incomplete combustion?

• nitrogen oxide

• carbon monoxide

• Carbon dioxide

• coal gas

he picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.

• Case 1

• case 2

• Both case 1 and case 2

• D. The paper doesn’t burn in both the cases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Moderately hot zone in a candle flame

• outer zone

• middle zone

• innermost zone

• wax candle

Ideal fuel has ____________ calorific value

• Zero

• Low

• Moderate

• High

Tags

NGSS.HS-PS1-4