______ is built on rivers to regulate water flow and distribute water.

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Dam is built on rivers to regulate water flow and distribute water.

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Chapter 2: Water - Evaluation [Page 28]

Chapter 2 Water
Evaluation | Q II. 3. | Page 28

The process of changing water into its vapour is called ______.

Take out the cooled bottle of water from the refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?

The boiling point of water is ______

Give a reason for the following.

Alum is added to water in sedimentation tanks.

______ water contains 0.05% to 1% of salts.

Every year _______ is observed as the world water day.

Analogy:

Contain more than 3% of salt: ______:: upto 3% of salt dissolved: Brackish water.

______ is a transparent, tasteless, odourless, chemical substance.

Water is a non-transparent chemical.

The chemical name of water is ______.