MEDIUM
8th CBSE
IMPORTANT
Earn 100

List three uses of nylon.

Important Questions on Test

MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 8
List three properties of polymers, with one application for each property.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 9
Explain why sodium is not stored in the open but under kerosene.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 9
Can water or copper sulphate solution be used instead of kerosene to store sodium? Why or why not?
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 10

Study the diagram and answer the question.
Label the products (marked a, b, c, and d) obtained by the destructive distillation of coal.

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EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 10

How can the presence of (a) be confirmed?

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MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 11
What methods of irrigation will you use on a vegetable farm if there is shortage of water? Explain.
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 12
What is petroleum refining? Draw a labelled diagram of a fractionating column.
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 20 - Test>Test>Q 13

Yeast and sugar are added to a bottle of warm water. A balloon is fixed over the mouth of the bottle. After some time, the balloon inflates as yeast breaks down the sugar and releases gas. Which gas does it release?