MEDIUM
8th CBSE
IMPORTANT
Earn 100

Differentiate between exhaustible and inexhaustible natural resources. Give two examples of each.

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
Explain the different zones of a candle flame.
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.

Question Image

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?