_______ can be seen moving in a beam of sunlight in a dark room.

रिकाम्या जागा भरा

Dust particles can be seen moving in a beam of sunlight in a dark room.

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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?

पाठ 4: Air - Evaluation [पृष्ठ ५५]

पाठ 4 Air
Evaluation | Q II. 4. | पृष्ठ ५५

What is air pollution ? What are the harmful effects of sulphur dioxide, nitrogen dioxide and hydrogen sulphide present in the air ?

What are the two ways in which nitrogen fixation occurs?

A fuel when used releases least amount of pollutants in the air.

What is the significance of water vapour in air?

Give reason:

Mountaineers and divers carry oxygen cylinders with them.

Tabulate the various components of air, including the components with variable composition.

What is the percentage of oxygen in air?

What is the composition of air?

Write a note on nitrogen.

The solid form of CO₂ is called dry ice which undergoes condensation.