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प्रश्न
What is wind? What precautions must be taken while placing a wind vane?
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उत्तर
The wind is air in motion. A wind vane indicates the direction of the wind and consists of a rotating arm pivoted on a vertical rod. The arrow of the wind vane always points in the direction from which the wind blows and the wind is named accordingly. For example, if the pointer is pointing to the East, the wind is blowing from East to West and, therefore, this wind is called an easterly wind. Wind vanes are usually placed away from obstacles such as high buildings, trees, etc.
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संबंधित प्रश्न
Write true or false. Correct the false statement.
Cyclones and anticyclones are examples of variable winds.
Fill in the blank:
Planetary winds are also called permanent or _________winds.
Name the factors that determine the temperature at a place.
How does the following element influence the weather of a place?
Temperature
Name the various forms of precipitation.
What does a large difference between the temperatures of a dry-bulb thermometer and a wet-bulb thermometer of a hygrometer indicate?
How is the weather forecast made? Why is weather forecast necessary?
- Identify the four types of clouds shown in the photographs.
- Which of these causes heavy rainfall?
This could be a classroom activity. If your school laboratory has an anemometer, use it to record your city’s wind speed for a week. Use the Beaufort Scale to find out the character of wind during these days. Record your observations carefully in your notebook. You could even draw small neat sketches to show the effect of the wind.
Complete the following table.
| Weather | Climate |
| Short-lived condition of atmosphere | |
| Does not change quickly | |
| Expressed with respect to a specific place | |
| Elements of climate: Temperature, pressure, winds, humidity and precipitation |
