Combustion & Flame

Combustion and flame Worksheet-1

Fill in the blanks:

1. Burning of wood and coal causes ____ of air.

Blue coloured flame is produced by _____ combustion of fuel.

3. Fuel must be heated to its ____ before it starts burning.

4. Fire produced by oil cannot be controlled by ____.

Answer:

Combustion and flame Worksheet-2

Multiple Choice Questions:

1. Water should not be used to extinguish _____.

A. Fire due to electric short circuit

B. Fire due to burning of wood

C. Fire due to burning of cotton

D. Fire due to crackers

2. When magnesium ribbon is burnt it produces ______.

A. Magnesium hydroxide           B. Magnesium oxide

Combustion and flame Worksheet-3

Multiple Choice Questions:

11. Which one of the following is non Combustible?

A. Stone piece                                B. Paper

C. Straw                                          D. Matchsticks

12. We can boil water in a paper cup without cup being burnt because ______

A. Ignition temperature of paper is not reached in the presence of water