Advertisements
Advertisements
प्रश्न
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
उत्तर
A weather cock is an instrument which is used to indicate the direction in which air is moving. It consists of an arrow, mounted at its centre of gravity so it can move freely about a vertical axis.
APPEARS IN
संबंधित प्रश्न
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Describe a simple experiment with the help of a diagram to show that Air has mass
What will happen if the amount of water vapour in the air increases.
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.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Draw a neat labelled diagram for the following experiment.
To demonstrate the burning of sulphur in a jar of oxygen.
Mention two advantages of wind energy.
Cool and soothing wind: Breeze.
uproot trees wind: ______.
In the boxes of Column, I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II
| Column I | Column II | ||
| (a) | DILLMWIN | (a) | |
| (b) | YNOGXE | (b) | |
| (c) | MESKO | (c) | |
| (d) | TUDS | (d) | |
