Explain the different zones of a candle flame.

Important Questions on Combustion and Fossil Fuels

MEDIUM

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>Exercises>Q D

What is a calorific value of a fuel? Write any four characteristics of an ideal fuel.

MEDIUM

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>Exercises>Q D

What are fossil fuels? How were coal and petroleum formed?

MEDIUM

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>Exercises>Q D

What are the products obtained on refining petroleum? Write their main uses.

MEDIUM

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>Exercises>Q D

Name any four air pollutants and describe their harmful effects.

HARD

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>LET'S RECALL

Recall and complete the concept map given below.

MEDIUM

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>LET'S APPLY

Why is hydrogen not used as a domestic fuel even though it has the highest calorific value?

HARD

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>LET'S APPLY

Mitali and John purchased gas stoves from a shop both of which were of the same type. After a month of use, they found that Mitali’s stove produces a yellow flame, while John’s stove produces a blue one. Who needs to clean the burner of the stove? Why?

MEDIUM

8th CBSE

IMPORTANT

OXFORD New Science In Everyday Life 8>Chapter 5 - Combustion and Fossil Fuels>LET'S DISCUSS

Are fossil fuels a boon or a curse? Discuss.