Imp Questions For All Chapters – Geography Class 7
Winds
Short Questions
1. What is wind?
Answer: The movement of air from high-pressure areas to low-pressure areas is called wind.
2. Why do winds blow?
Answer: Winds blow due to differences in air pressure in different regions.
3. What is the Coriolis Effect?
Answer: The Coriolis Effect is the deflection of winds due to Earth’s rotation.
4. Which winds bring rain to India in summer?
Answer: The South-West Monsoon winds bring rain to India during summer.
5. What are planetary winds?
Answer: Planetary winds are permanent winds that blow throughout the year, like Trade Winds and Westerlies.
6. What are the Roaring Forties?
Answer: Roaring Forties are strong winds that blow around 40°S latitude in the Southern Hemisphere.
7. What is a cyclone?
Answer: A cyclone is a low-pressure system where winds spiral towards the center, causing heavy rainfall and storms.
8. Why are polar regions high-pressure areas?
Answer: Polar regions have high pressure because cold air contracts and becomes dense.
9. What is the difference between land breeze and sea breeze?
Answer: Land breeze blows from land to sea at night, while sea breeze blows from sea to land during the day.
10. How are cyclones named?
Answer: Cyclones are named from a pre-decided list of names based on oceanic regions.
Long Questions
1. How does Earth’s rotation affect the direction of winds?
Answer: Due to Earth’s rotation, winds do not blow in a straight line. The Coriolis Effect deflects winds to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
2. Why do monsoon winds change direction in summer and winter?
Answer: In summer, land heats up faster than the sea, creating low pressure, so winds blow from the sea (South-West Monsoon). In winter, land cools faster, creating high pressure, so winds blow from land to sea (North-East Monsoon).
3. What are anticyclones and how do they affect weather?
Answer: An anticyclone is a high-pressure system where winds move outward in a circular motion. It brings clear skies, dry weather, and light winds, creating pleasant conditions.
4. Why do winds in the Southern Hemisphere blow faster than in the Northern Hemisphere?
Answer: In the Southern Hemisphere, there are fewer land obstacles, allowing winds to blow at greater speeds compared to the Northern Hemisphere, where mountains and land masses slow them down.
5. What are local winds? Give examples.
Answer: Local winds are winds that blow for a short duration over a small region due to temperature and pressure differences. Examples include Loo (hot wind in India), Föhn (warm wind in Europe), and Chinook (warm wind in North America).
6. What is the Doldrums region, and why is it called a calm belt?
Answer: The Doldrums is a low-pressure region near the equator (5°N to 5°S), where warm air rises, causing minimal horizontal wind movement, making it a calm and windless zone.
7. What causes the formation of cyclones?
Answer: Cyclones form when warm, moist air rises rapidly, creating a low-pressure system. Surrounding high-pressure air moves in, and due to Earth’s rotation, the winds spiral, forming a cyclone with heavy rain and strong winds.
8. How do sea and land breezes occur?
Answer: During the day, land heats up faster than the sea, causing low pressure over land and a sea breeze. At night, land cools faster, creating high pressure, so air moves from land to sea, forming a land breeze.
9. What are the different types of planetary winds?
Answer: Planetary winds include Trade Winds (Easterlies) that blow towards the equator, Westerlies that blow from mid-latitudes towards poles, and Polar Winds that blow from the polar high-pressure areas to the subpolar low-pressure belts.
10. What are the effects of cyclones on coastal areas?
Answer: Cyclones cause heavy rainfall, strong winds, and high tidal waves called storm surges, leading to flooding, destruction of property, loss of life, and disruption of transportation and communication in coastal areas.
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