Advertisements
Advertisements
प्रश्न
Fill in the blank:
_____________ discovered the oxygen gas.
Advertisements
उत्तर
Joseph Priestley discovered the oxygen gas.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Polluted air is harmful to ____.
State what do you understand by the term ‘air’. Explain its importance to mankind.
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
Name the important scientists and their studies which led to the discovery of the components of air.
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
What is global warming?
______ is important for all living creatures.
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 |
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
