Advertisements
Advertisements
प्रश्न
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Advertisements
उत्तर
We will observe randomly moving dust particles in the beam of light. This confirms the presence of dust particles in the air.
APPEARS IN
संबंधित प्रश्न
What is wind?
Give two uses of the following component present in air:
oxygen
Give two uses of the following component present in air:
carbon dioxide
How is air useful to scooters and cars.?
Give a brief account of the discovery of air and the scientists involved.
______ soil has pH 7.
Water does not have a ______ but has definite ______ and ______.
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. The constituent of air which is around 0.02% | A: Nitrogen |
| 2. The constituent of air which is inert or unreactive | B: Oxygen |
| 3. The constituent of air which is non-combustible, but supports combustion. |
C: Sulphur dioxide |
| 4. A pollutant in air responsible for acid rain | D: Carbon dioxide |
| 5. The main rare gas present in air. | E: Argon |
The process of conversion of iron into hydrated form of oxides is called _______.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Why did the tiny bubbles appeared?
