Class 11 Geography - Atmospheric Circulation and Weather Systems - General circulation of the atmosphere and planetary winds Expert Quiz

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यदि दो स्थान समान ऊँचाई पर हैं और पहले स्थान की वायु अधिक गर्म है तो वहाँ दाब सामान्यतः कम क्यों होगा?

If two places are at the same altitude and the first place has warmer air, why will pressure generally be lower there?

Explanation opens after your attempt
Correct Answer

A. वायु फैलकर कम घनी हो जाती हैAir expands and becomes less dense

Step 1

Concept

Warm air expands and its density decreases, so pressure falls. For exams, remember the inverse relation between temperature and pressure.

Step 2

Why this answer is correct

The correct answer is A. वायु फैलकर कम घनी हो जाती है / Air expands and becomes less dense. Warm air expands and its density decreases, so pressure falls. For exams, remember the inverse relation between temperature and pressure.

Step 3

Exam Tip

गर्म वायु फैलती है और उसका घनत्व घटता है, इसलिए दाब कम होता है। परीक्षा में तापमान और दाब का उलटा संबंध याद रखें।

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किस बदलाव से सतही दाब सामान्यतः बढ़ेगा?

Which change will generally increase surface pressure?

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Correct Answer

C. वायु का ठंडा होकर घना होनाCooling and densification of air

Step 1

Concept

Cold air is denser and heavier, so it increases surface pressure. Remember that pressure tends to rise when temperature falls.

Step 2

Why this answer is correct

The correct answer is C. वायु का ठंडा होकर घना होना / Cooling and densification of air. Cold air is denser and heavier, so it increases surface pressure. Remember that pressure tends to rise when temperature falls.

Step 3

Exam Tip

ठंडी वायु अधिक घनी और भारी होती है, इसलिए सतह पर दाब बढ़ाती है। ताप घटने पर दाब बढ़ने की प्रवृत्ति याद रखें।

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दाब घटने पर सामान्यतः वायु के आयतन में क्या परिवर्तन होता है, यदि तापमान स्थिर माना जाए?

What generally happens to the volume of air when pressure decreases, assuming temperature remains constant?

Explanation opens after your attempt
Correct Answer

C. आयतन बढ़ता हैVolume increases

Step 1

Concept

When pressure decreases, air expands and volume increases. Gas behaviour helps explain the physical basis of pressure.

Step 2

Why this answer is correct

The correct answer is C. आयतन बढ़ता है / Volume increases. When pressure decreases, air expands and volume increases. Gas behaviour helps explain the physical basis of pressure.

Step 3

Exam Tip

दाब घटने पर वायु फैलती है और आयतन बढ़ता है। गैसीय व्यवहार समझना दाब के भौतिक आधार को स्पष्ट करता है।

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किस कारण से हिमालय जैसे ऊँचे पर्वतीय क्षेत्रों में सामान्यतः दाब कम मिलता है?

Why is pressure generally low in high mountain regions like the Himalaya?

Explanation opens after your attempt
Correct Answer

A. वहाँ वायु स्तंभ की ऊँचाई और भार कम होता हैThe height and weight of the air column above are lower there

Step 1

Concept

At high altitude, there is less air above, so pressure is lower. Distinguish mountain station pressure from sea level pressure.

Step 2

Why this answer is correct

The correct answer is A. वहाँ वायु स्तंभ की ऊँचाई और भार कम होता है / The height and weight of the air column above are lower there. At high altitude, there is less air above, so pressure is lower. Distinguish mountain station pressure from sea level pressure.

Step 3

Exam Tip

ऊँचाई पर ऊपर की वायु कम होती है, इसलिए दाब कम होता है। पर्वतीय दाब को समुद्र तल दाब से अलग समझें।

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