Advertisements
Advertisements
प्रश्न
State what do you understand by the term ‘air’. Explain its importance to mankind.
Advertisements
उत्तर
Air is a mixture whose composition varies at different intervals of time and different places of the world. Man cannot survive without air and water and hence the air is very essential for survival.
संबंधित प्रश्न
How is air useful to scooters and cars.?
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
Why is it said that-
Air is a homogeneous mixture of various gases.
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
What is global warming?
______ is important for all living creatures.
Cool and soothing wind: Breeze.
uproot trees wind: ______.
Wind does not help in the movement of which of the following?
Match the items of Column I with the items of Column II
| Column I | Column II | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of air flow |
| (e) | Wind | (v) | Prevent dust particles |
