Make a labelled diagram of a candle flame.

Important Questions on Combustion and Flame

EASY

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 7

Name the unit in which the calorific value of a fuel is expressed.

EASY

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 8

Explain how $\mathrm{C}{\mathrm{O}}_2$ is able to control fires?

EASY

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 9

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain. 

MEDIUM

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 10

Which zone of a flame does a goldsmith use for melting gold and silver and why?

EASY

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 11

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

MEDIUM

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 12

Can the process of rusting be called combustion? Discuss.

MEDIUM

8th Punjab Board

IMPORTANT

Science>Chapter 6 - Combustion and Flame>Exercises>Q 13

Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?