i. Wind is moving air.
ii. Winds are generated due to uneven heating on the earth.
iii. Near the earth’s surface warm air rises up whereas cooler air comes down.
iv. Air moves from a region of high pressure to a region of low pressure.
v. Air expands on heating.
vi. Warm air is lighter than the cold air.
i. In summer the winds flow from the land towards the ocean. False
ii. In winter the winds flow from the land to the ocean. True
iii. A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it. False
iv. The coastline of India is not vulnerable to cyclones. False
v. Increased wind speed is accompanied by a reduced air pressure. True
vi. Regions close to the equator get maximum heat from the Sun. True
Ans. Amritsar
Ans. The moving air is called wind.
Ans. The instrument that measures the wind speed is called an anemometer.
Ans. Yes, the force of the wind pushes the kite upwards and backwards.
Ans. Yes, the water gives back heat when vapour condenses into liquid.
Ans. Uneven heating on the earth is the main cause of wind movements.
Ans. We have to fill air into the bicycle tube to keep it tight.
Ans. Thunderstorms develop in hot, humid tropical areas like India very frequently.
Ans. Tornadoes can appear as a traditional funnel shape, or in a slender rope-like form.
Ans. The word monsoon is derived from the Arabic word ‘mausam’, which means ‘season’.
Ans. In winter, the direction of the wind flow gets reversed; it flows from the land to the ocean.
Ans. Factors like wind speed, wind direction, temperature and humidity contribute to the development of cyclones.
Ans. All storms are low pressure systems. Thus, wind speed plays an important role in the formation of storms.
Ans. It is due to the pressure exerted by moving air (or wind) that the leaves of trees, flags and banners flutter when the wind is blowing.
Ans. Yes, it difficult to ride a bicycle against the direction of the wind as air exerts pressure in the opposite direction in which bicycle is moving.
Ans. Meteorologists around the world use modern technology such as satellites, weather radars and computers etc. to track tropical cyclones as they develop.