What are secondary fuels? Give examples.

Important Questions on Combustion and Flame

EASY

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q D

Why the lowermost zone of flame is called dark zone?

HARD

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

How are fuels classified on the basis of their physical state? Give at least two examples of each.

HARD

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

What is a fire extinguisher? Explain its working.

MEDIUM

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

Mention the different methods by which a fire can be extinguished?

MEDIUM

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

Describe the different zones of a candle flame?

MEDIUM

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

Differentiate between complete and incomplete combustion. Give their word equations.

HARD

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

What do you mean by fuel efficiency? What role does it play in the selection of the fuel?

MEDIUM

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 5 - Combustion and Flame>EXERCISES>Q E

How acid rain is caused? Explain briefly.