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Pressure and Winds (दाब और पवन) for SSC & Railway Exams 2026 | Complete Geography Notes + MCQs

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दाब और पवन (Pressure & Winds)

📘 सिद्धांत (Theory)

🌬️ वायुदाब (Atmospheric Pressure)

वायुदाब वह बल है जो वायु अपने भार के कारण पृथ्वी की सतह पर डालती है।

Atmospheric pressure is the force exerted by air on Earth’s surface.

  • मापने का यंत्र: Barometer
  • इकाई: Millibar (mb) या Hectopascal (hPa)
  • सामान्य दाब: 1013 mb

🔼 उच्च दाब (High Pressure)

  • ठंडी वायु → भारी → नीचे की ओर जाती है
  • साफ मौसम (Clear weather)

🔽 निम्न दाब (Low Pressure)

  • गर्म वायु → हल्की → ऊपर उठती है
  • बादल, वर्षा (Clouds & Rain)

💨 पवन (Winds)

वायु का उच्च दाब से निम्न दाब की ओर प्रवाह पवन कहलाता है।

Winds blow from high pressure to low pressure.

🌪️ पवन के प्रकार (Types of Winds)

1️⃣ स्थायी पवन (Permanent Winds)

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6

  • सालभर एक ही दिशा में
  • उदाहरण:
  • Trade Winds (व्यापारिक पवन)
  • Westerlies (पश्चिमी पवन)
  • Easterlies (ध्रुवीय पवन)

2️⃣ मौसमी पवन (Seasonal Winds)

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8

  • मौसम के अनुसार दिशा बदलती है
  • उदाहरण: Monsoon Winds (मानसून पवन)
  • SW Monsoon → Rainy season
  • NE Monsoon → Dry winds

3️⃣ स्थानीय पवन (Local Winds)

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Image source : Byjus

  • छोटे क्षेत्र में प्रभाव
  • उदाहरण:
  • Loo (लू) – गर्म, उत्तर भारत
  • Chinook – गर्म, Canada/USA
  • Foehn – यूरोप

🌍 Coriolis Effect (कोरिओलिस प्रभाव)

  • पृथ्वी के घूर्णन के कारण पवन की दिशा मुड़ती है
  • Northern Hemisphere → Right
  • Southern Hemisphere → Left

📘 In English (Quick Revision)

  • Pressure → Weight of air
  • Winds → Move from High → Low pressure
  • Types: Permanent, Seasonal, Local
  • Coriolis Effect → Deflection of winds

📝 MCQs (10 Questions)

Q1. वायुदाब मापने का यंत्र क्या है? / Instrument to measure pressure?

A. Thermometer

B. Barometer

C. Hygrometer

D. Anemometer

Answer: B

Q2. पवन किस दिशा में बहती है? / Winds blow from:

A. Low to High

B. High to Low

C. East to West

D. North to South

Answer: B

Q3. लू किस प्रकार की पवन है? / Loo is which type of wind?

A. Permanent

B. Seasonal

C. Local

D. Polar

Answer: C

Q4. मानसून किस प्रकार की पवन है? / Monsoon is:

A. Local

B. Seasonal

C. Permanent

D. Polar

Answer: B

Q5. Coriolis Effect का कारण क्या है? / Cause of Coriolis effect?

A. Revolution

B. Rotation

C. Gravity

D. Pressure

Answer: B

Q6. उच्च दाब क्षेत्र में कैसा मौसम होता है? / High pressure weather:

A. Rainy

B. Cloudy

C. Clear

D. Stormy

Answer: C

Q7. व्यापारिक पवन किस श्रेणी में आती है? / Trade winds are:

A. Local

B. Seasonal

C. Permanent

D. Temporary

Answer: C

Q8. वायुदाब की इकाई क्या है? / Unit of pressure:

A. Celsius

B. Meter

C. Millibar

D. Watt

Answer: C

Q9. उत्तरी गोलार्ध में पवन किस ओर मुड़ती है? / In Northern Hemisphere winds deflect:

A. Left

B. Right

C. Up

D. Down

Answer: B

Q10. निम्न दाब क्षेत्र में क्या होता है? / Low pressure causes:

A. Clear sky

B. Rainfall

C. Dry weather

D. Cold winds

Answer: B

🎯 Exam Tip (महत्वपूर्ण टिप)

  • High Pressure → Clear Weather
  • Low Pressure → Rain & Storm
  • Wind = High → Low Pressure


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