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constant population MCQ Questions for Class 12

constant population se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

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6 questions tagged with constant population.

Question 1/6 Expert Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 21

यदि किसी city की arithmetic density बढ़ती है जबकि total population unchanged रहती है, तो कौन-सी स्थिति mathematically इसे समझाती है?

If a city's arithmetic density increases while total population remains unchanged, which situation mathematically explains it?

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Correct Answer

A. Calculated area घट गया होThe calculated area has decreased

Explanation

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Density \(P/A\) है। Population unchanged रहते हुए density बढ़ने के लिए denominator area को घटना होगा। यह boundary contraction, area reclassification या water-area exclusion जैसी स्थिति से हो सकता है। इसलिए पहला विकल्प सही है। Population unchanged होने की condition में density increase को population growth से explain नहीं किया जा सकता। / Density is \(P/A\). With population unchanged, density can rise only if the denominator, area, decreases. This may occur through boundary contraction, area reclassification, or exclusion of water area. Therefore, the first option is correct. Under the stated condition of unchanged population, density increase cannot be explained by population growth.

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Question 2/6 Expert Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 21

यदि किसी region की density 40 प्रतिशत बढ़ती है जबकि population unchanged है, तो area original का कितना प्रतिशत रह जाएगा?

If a region's density increases by 40 percent while population remains unchanged, what percentage of the original area remains?

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Correct Answer

B. 71.4 प्रतिशत71.4 percent

Explanation

Simple Explanation

Population constant और density multiplier 1.40 है। इसलिए area multiplier \(1/1.40=0.714285...\) है। अर्थात new area original का लगभग 71.4 percent है। दूसरा विकल्प सही है। Area लगभग 28.6 percent घटा। 40 percent density rise को 40 percent area decline मानना inverse relationship को गलत apply करना होगा। / Population is constant and the density multiplier is 1.40. Therefore, the area multiplier is \(1/1.40=0.714285...\). The new area is about 71.4 percent of the original. The second option is correct. Area decreased by about 28.6 percent. Treating a 40 percent density rise as a 40 percent area decline would misuse the inverse relationship.

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Question 3/6 Expert Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 19

यदि किसी region की population density 30 प्रतिशत बढ़ी लेकिन total population unchanged रही, तो area original का लगभग कितना percent रह गया?

If a region's population density increased by 30 percent while total population remained unchanged, approximately what percent of the original area remains?

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Correct Answer

B. 76.9 प्रतिशत76.9 percent

Explanation

Simple Explanation

Population constant है और density multiplier 1.30 है। इसलिए area multiplier \(1/1.30 = 0.76923...\) होगा। अर्थात new area original का लगभग 76.9 percent है। दूसरा विकल्प सही है। इसका मतलब area लगभग 23.1 percent घटा। 30 percent density increase का अर्थ 30 percent area decrease नहीं होता क्योंकि inverse percentages symmetric नहीं हैं। / Population is constant and density multiplier is 1.30. Therefore, the area multiplier is \(1/1.30=0.76923...\). The new area is about 76.9 percent of the original, making the second option correct. This means area decreased by about 23.1 percent. A 30 percent density increase does not imply a 30 percent area decrease because inverse percentage changes are not symmetric.

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Question 4/6 Hard Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 20

यदि population unchanged रहे और density 250 से बढ़कर 400 व्यक्ति प्रति वर्ग किलोमीटर हो जाए, तो area original का कितना प्रतिशत रह जाएगा?

If population remains unchanged and density rises from 250 to 400 persons per square kilometre, what percentage of the original area remains?

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Correct Answer

B. 62.5 प्रतिशत62.5 percent

Explanation

Simple Explanation

Population constant होने पर area density के inverse proportion में है। इसलिए \(A_{new}/A_{old} = D_{old}/D_{new} = 250/400 = 0.625\)। इसका अर्थ new area original का 62.5 percent है। इसलिए दूसरा विकल्प सही है। यह 37.5 percent reduction के बराबर है। परीक्षा में inverse relationship को direct percentage difference से confuse न करें। / With population constant, area is inversely proportional to density. Thus \(A_{new}/A_{old} = D_{old}/D_{new} = 250/400 = 0.625\). This means the new area is 62.5 percent of the original area. Therefore, the second option is correct. This corresponds to a 37.5 percent reduction. Do not confuse inverse proportionality with a direct percentage difference.

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Question 5/6 Medium Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 21

यदि किसी region की population unchanged रहे लेकिन density 25 प्रतिशत बढ़ जाए, तो area में लगभग कितना परिवर्तन होगा?

If a region's population remains unchanged but density increases by 25 percent, approximately how much does area change?

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Correct Answer

B. Area 20 प्रतिशत घटेगाArea will decrease by 20 percent

Explanation

Simple Explanation

Density 25 percent बढ़ने का मतलब new density \(1.25D\) है। Population constant होने पर \(A_{new} = \frac{P}{1.25D} = 0.8A\) होगा। इसलिए area 20 percent घटा है और दूसरा विकल्प सही है। 25 percent decrease मानना inverse relationship को incorrectly apply करना होगा। / A 25 percent increase in density means the new density is \(1.25D\). With population constant, \(A_{new} = \frac{P}{1.25D} = 0.8A\). Therefore, area decreases by 20 percent and the second option is correct. Assuming a 25 percent decrease would incorrectly apply the inverse relationship.

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Question 6/6 Medium Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 19

यदि population unchanged हो और density 200 से घटकर 160 हो जाए, तो area में कितना percentage change हुआ?

If population remains unchanged and density falls from 200 to 160, what percentage change occurred in area?

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Correct Answer

C. Area 25 प्रतिशत बढ़ाArea increased by 25 percent

Explanation

Simple Explanation

Population constant होने पर area density के inverse proportion में होता है। Original area \(P/200\) और new area \(P/160\) है। Ratio \(\frac{P/160}{P/200} = \frac{200}{160} = 1.25\) है। इसलिए area 25 percent बढ़ा और तीसरा विकल्प सही है। केवल density का 20 percent decline देखकर area को 20 percent बढ़ा मानना गलत होगा। / With population constant, area varies inversely with density. Original area is \(P/200\) and new area is \(P/160\). Their ratio is \(\frac{P/160}{P/200} = \frac{200}{160} = 1.25\). Therefore, area increased by 25 percent and the third option is correct. It would be incorrect to assume a 20 percent area increase merely because density fell by 20 percent.

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