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Concept-wise Practice

population share MCQ Questions for Class 12

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

Practice Questions

24 questions tagged with population share.

यदि किसी region में 80 प्रतिशत population 50 प्रतिशत area में रहती है, तो remaining portion की density regional average की कितनी गुना होगी?

If 80 percent of a region's population lives in 50 percent of its area, how many times the regional average is the density of the remaining portion?

Explanation opens after your attempt
Correct Answer

B. 0.4 गुना0.4 times

Explanation

Simple Explanation

Remaining portion में 20 percent population 50 percent area में रहती है। इसलिए relative density \(0.20/0.50=0.4\) times regional average है। दूसरा विकल्प सही है। First portion की density \(0.80/0.50=1.6\) times average होगी। यह internal concentration contrast को स्पष्ट करता है। / The remaining portion contains 20 percent of the population in 50 percent of the area. Its relative density is therefore \(0.20/0.50=0.4\) times the regional average. The second option is correct. The first portion has density \(0.80/0.50=1.6\) times the average, showing a strong internal concentration contrast.

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यदि 72 प्रतिशत population 30 प्रतिशत area में रहती है, तो उस area की density regional average की कितनी गुना होगी?

If 72 percent of the population lives in 30 percent of the area, how many times the regional average is the density of that area?

Explanation opens after your attempt
Correct Answer

C. 2.4 गुना2.4 times

Explanation

Simple Explanation

Relative density \(\frac{0.72}{0.30}=2.4\) है। इसलिए selected area की density regional average की 2.4 times होगी और तीसरा विकल्प सही है। Exact total population or total area जानना जरूरी नहीं है क्योंकि proportions sufficient हैं। यह spatial concentration की intensity measure करने का आसान तरीका है। / Relative density is \(\frac{0.72}{0.30}=2.4\). Therefore, the selected area's density is 2.4 times the regional average and the third option is correct. Exact values of total population or area are not required because proportional shares are sufficient. This is a useful method for measuring the intensity of spatial concentration.

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यदि किसी region की average density 210 है और total population का 48 प्रतिशत केवल 16 प्रतिशत area में रहता है, तो उस portion की density कितनी होगी?

If a region's average density is 210 and 48 percent of total population lives in only 16 percent of the area, what is the density of that portion?

Explanation opens after your attempt
Correct Answer

B. 630 व्यक्ति प्रति वर्ग किलोमीटर630 persons per square kilometre

Explanation

Simple Explanation

Selected portion की relative density \(\frac{0.48}{0.16}=3\) times regional average है। इसलिए density \(210\times3=630\) व्यक्ति प्रति वर्ग किलोमीटर होगी। दूसरा विकल्प सही है। Population share area share से तीन गुना है, इसलिए local density भी regional average की तीन गुना है। परीक्षा में spatial concentration questions में population share को area share से divide करें। / The selected portion has relative density \(\frac{0.48}{0.16}=3\) times the regional average. Therefore, its density is \(210\times3=630\) persons per square kilometre. The second option is correct. Because the population share is three times the area share, local density is also three times the regional average. In examinations, divide population share by area share in spatial-concentration questions.

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यदि किसी country की 75 प्रतिशत population 30 प्रतिशत area में रहती है और national density 320 व्यक्ति प्रति वर्ग किलोमीटर है तो उस 30 प्रतिशत area का density कितना होगा?

If 75 percent of a country's population lives in 30 percent of its area and national density is 320 persons per square kilometre what is the density of that 30 percent area?

Explanation opens after your attempt
Correct Answer

C. 800 व्यक्ति प्रति वर्ग किलोमीटर800 persons per square kilometre

Explanation

Simple Explanation

relative density factor \(\frac{0.75}{0.30}=2.5\) है। national average density 320 है इसलिए selected area density \(320\times2.5=800\) व्यक्ति प्रति वर्ग किलोमीटर होगा। विकल्प C सही है। 960 three-times factor दर्शाता है जो यहाँ लागू नहीं होता। परीक्षा में national density को population-share-to-area-share ratio से multiply करें। / Relative density factor is \(\frac{0.75}{0.30}=2.5\). National average density is 320, so density in the selected area is \(320\times2.5=800\) persons per square kilometre. Therefore option C is correct. A value of 960 would represent a factor of three, which does not apply here. Multiply national density by the population-share-to-area-share ratio.

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किसी region में 42 प्रतिशत population 14 प्रतिशत area में रहती है। उस area का density पूरे region के average density की कितनी गुनी होगी?

Forty-two percent of a region's population lives in 14 percent of its area. How many times the region's average density is the density of that area?

Explanation opens after your attempt
Correct Answer

C. 3 गुना3 times

Explanation

Simple Explanation

relative density factor \(\frac{0.42}{0.14}=3\) है। इसलिए selected area का density whole-region average का तीन गुना होगा और विकल्प C सही है। actual population या area values आवश्यक नहीं हैं क्योंकि proportions ही concentration बताते हैं। परीक्षा में इस प्रकार के questions में population share को area share से divide करना सबसे तेज और सटीक तरीका है। / Relative density factor is \(\frac{0.42}{0.14}=3\). Therefore density in the selected area is three times the region's average density and option C is correct. Actual population and area values are unnecessary because the proportions alone determine concentration. In such examination questions divide population share by area share for the fastest accurate solution.

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यदि किसी region का 65 प्रतिशत population 25 प्रतिशत area में और शेष population शेष area में रहती है तो कौन-सा हिस्सा अधिक dense है?

If 65 percent of a region's population lives in 25 percent of its area and the remaining population lives in the remaining area which part is denser?

Explanation opens after your attempt
Correct Answer

A. पहला 25 प्रतिशत areaFirst 25 percent area

Explanation

Simple Explanation

पहले हिस्से का relative density factor \(\frac{0.65}{0.25}=2.6\) है। दूसरे हिस्से का factor \(\frac{0.35}{0.75}\approx0.467\) है। इसलिए पहला 25 प्रतिशत area बहुत अधिक dense है और विकल्प A सही है। यह question दिखाता है कि population share अकेले नहीं बल्कि corresponding area share के साथ देखना आवश्यक है। / The first part has relative density factor \(\frac{0.65}{0.25}=2.6\). The remaining part has factor \(\frac{0.35}{0.75}\approx0.467\). Therefore the first 25 percent of area is much denser and option A is correct. This demonstrates that population share must always be interpreted together with the corresponding area share when comparing spatial concentration.

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किसी country की 54 प्रतिशत population 18 प्रतिशत land area में रहती है। उस हिस्से का density national average की कितनी गुनी होगी?

Fifty-four percent of a country's population lives in 18 percent of its land area. How many times the national average density is the density of that part?

Explanation opens after your attempt
Correct Answer

C. 3 गुना3 times

Explanation

Simple Explanation

relative density factor \(\frac{0.54}{0.18}=3\) है। इसलिए उस हिस्से की density national average की तीन गुनी होगी। विकल्प C सही है। percentage shares का ratio ही concentration factor देता है और actual population या area की आवश्यकता नहीं होती। परीक्षा में यदि population share area share से कई गुना हो तो density भी national average से उसी factor के आसपास अधिक होगी। / Relative density factor is \(\frac{0.54}{0.18}=3\). Therefore density in that part is three times the national average and option C is correct. The ratio of percentage shares directly gives the concentration factor, so actual population and area values are unnecessary. When population share is several times the area share, subregional density is correspondingly higher than the national average.

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यदि किसी country की average density 280 व्यक्ति प्रति वर्ग किलोमीटर है लेकिन 35 प्रतिशत population केवल 14 प्रतिशत area में रहती है तो उस area का density कितना होगा?

If a country's average density is 280 persons per square kilometre but 35 percent of its population lives in only 14 percent of its area what is the density of that area?

Explanation opens after your attempt
Correct Answer

C. 700 व्यक्ति प्रति वर्ग किलोमीटर700 persons per square kilometre

Explanation

Simple Explanation

relative density factor \(\frac{0.35}{0.14}=2.5\) है। इसलिए selected area density \(280\times2.5=700\) व्यक्ति प्रति वर्ग किलोमीटर होगा। विकल्प C सही है। actual population या total area जानने की जरूरत नहीं क्योंकि proportional shares ही concentration factor देते हैं। परीक्षा में population share divided by area share method expert-level spatial questions को सरल बनाता है। / Relative density factor is \(\frac{0.35}{0.14}=2.5\). Therefore density in the selected area is \(280\times2.5=700\) persons per square kilometre. Option C is correct. Actual population or total area is unnecessary because proportional shares directly provide the concentration factor. The population-share divided by area-share method simplifies advanced spatial density questions.

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किसी देश का national density 300 व्यक्ति प्रति वर्ग किलोमीटर है। यदि 60 प्रतिशत population केवल 20 प्रतिशत area में रहती है तो उस हिस्से का density कितना होगा?

A country's national density is 300 persons per square kilometre. If 60 percent of its population lives in only 20 percent of its area what is the density of that part?

Explanation opens after your attempt
Correct Answer

C. 900 व्यक्ति प्रति वर्ग किलोमीटर900 persons per square kilometre

Explanation

Simple Explanation

relative density factor population share divided by area share से मिलता है। यहाँ \(\frac{0.60}{0.20}=3\)। इसलिए selected area density \(300\times3=900\) व्यक्ति प्रति वर्ग किलोमीटर होगा। विकल्प C सही है। यह calculation actual population या total area जाने बिना की जा सकती है क्योंकि proportional shares पर्याप्त हैं। परीक्षा में subregional concentration समझने के लिए यह share-ratio method बहुत उपयोगी है। / Relative density factor is population share divided by area share. Here \(\frac{0.60}{0.20}=3\). Therefore density in the selected area is \(300\times3=900\) persons per square kilometre. Option C is correct. The calculation does not require actual population or total area because proportional shares are sufficient. In examinations the share-ratio method is very useful for analysing subregional concentration.

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यदि किसी region के 40 प्रतिशत area में 70 प्रतिशत population रहती है, तो बाकी portion की density total regional average की कितनी गुना होगी?

If 70 percent of a region's population lives in 40 percent of its area, how many times the regional average is the density of the remaining portion?

Explanation opens after your attempt
Correct Answer

C. 0.5 गुना0.5 times

Explanation

Simple Explanation

Remaining portion में 30 percent population 60 percent area में रहती है। इसलिए उसकी relative density \(0.30/0.60=0.5\) times regional average है। तीसरा विकल्प सही है। First portion की density \(0.70/0.40=1.75\) times average होगी। यह spatial concentration के strong contrast को दिखाता है। / The remaining portion contains 30 percent of the population in 60 percent of the area. Its relative density is therefore \(0.30/0.60=0.5\) times the regional average. The third option is correct. The first portion has density \(0.70/0.40=1.75\) times the average, showing a strong spatial contrast.

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यदि किसी region में 65 प्रतिशत population 25 प्रतिशत area में रहती है, तो उस हिस्से की density regional average की कितनी गुना होगी?

If 65 percent of a region's population lives in 25 percent of its area, how many times the regional average density is the density of that portion?

Explanation opens after your attempt
Correct Answer

C. 2.6 गुना2.6 times

Explanation

Simple Explanation

Relative density \(\frac{0.65}{0.25}=2.6\) times regional average है। इसलिए तीसरा विकल्प सही है। Actual total population और total area की values की आवश्यकता नहीं है क्योंकि shares sufficient हैं। यह method spatial concentration को quickly compare करने के लिए useful है। परीक्षा में population share को area share से divide करें। / Relative density is \(\frac{0.65}{0.25}=2.6\) times the regional average. Therefore, the third option is correct. Exact values of total population and total area are unnecessary because the proportional shares are sufficient. This method is useful for quickly comparing spatial concentration. In examinations, divide population share by area share.

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यदि किसी region की national average density 150 है और total population का 55 प्रतिशत केवल 20 प्रतिशत area में रहता है, तो उस हिस्से की density कितनी होगी?

If a region's average density is 150 and 55 percent of its total population lives in only 20 percent of the area, what is the density of that portion?

Explanation opens after your attempt
Correct Answer

C. 412.5 व्यक्ति प्रति वर्ग किलोमीटर412.5 persons per square kilometre

Explanation

Simple Explanation

Selected portion की density regional average के relative \(\frac{0.55}{0.20}=2.75\) times होगी। इसलिए actual density \(150 \times 2.75 = 412.5\) व्यक्ति प्रति वर्ग किलोमीटर है। तीसरा विकल्प सही है। यह प्रश्न दिखाता है कि population share यदि area share से बहुत अधिक हो तो local density average से कई गुना हो सकती है। / The selected portion's density relative to the regional average is \(\frac{0.55}{0.20}=2.75\) times. Therefore, its density is \(150 \times 2.75 = 412.5\) persons per square kilometre. The third option is correct. This question shows that when a population share is much larger than its area share, local density can be several times the regional average.

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यदि किसी country की 80 प्रतिशत population 40 प्रतिशत area में रहती है और national density 260 व्यक्ति प्रति वर्ग किलोमीटर है तो उस 40 प्रतिशत area का density कितना होगा?

If 80 percent of a country's population lives in 40 percent of its area and national density is 260 persons per square kilometre what is the density of that 40 percent area?

Explanation opens after your attempt
Correct Answer

C. 520 व्यक्ति प्रति वर्ग किलोमीटर520 persons per square kilometre

Explanation

Simple Explanation

relative density factor \(\frac{0.80}{0.40}=2\) है। national average density 260 है इसलिए selected area density \(260\times2=520\) व्यक्ति प्रति वर्ग किलोमीटर होगा। विकल्प C सही है। 480 या 650 population और area shares के exact ratio से मेल नहीं खाते। परीक्षा में subregional density के लिए national density को relative density factor से multiply करें। / Relative density factor is \(\frac{0.80}{0.40}=2\). National average density is 260, so density in the selected area is \(260\times2=520\) persons per square kilometre. Therefore option C is correct. Values such as 480 or 650 do not match the exact population-to-area share ratio. Multiply national density by the relative density factor for such subregional problems.

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किसी region में 36 प्रतिशत population 12 प्रतिशत area में रहती है। उस area का density पूरे region के average density की कितनी गुनी होगी?

Thirty-six percent of a region's population lives in 12 percent of its area. How many times the region's average density is the density of that area?

Explanation opens after your attempt
Correct Answer

C. 3 गुना3 times

Explanation

Simple Explanation

relative density factor \(\frac{0.36}{0.12}=3\) है। इसलिए selected area का density पूरे region के average density का तीन गुना होगा। विकल्प C सही है। actual population या area values की आवश्यकता नहीं है क्योंकि shares का ratio सीधे concentration factor देता है। परीक्षा में population share divided by area share method को याद रखें। / Relative density factor is \(\frac{0.36}{0.12}=3\). Therefore density in the selected area is three times the average density of the whole region. Option C is correct. Actual population and area values are unnecessary because the ratio of shares directly gives the concentration factor. Remember population share divided by area share for such questions.

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यदि किसी region का 50 प्रतिशत population 20 प्रतिशत area में और शेष population शेष area में रहती है तो कौन-सा हिस्सा अधिक dense है?

If 50 percent of a region's population lives in 20 percent of its area and the remaining population lives in the remaining area which part is denser?

Explanation opens after your attempt
Correct Answer

A. पहला 20 प्रतिशत areaFirst 20 percent area

Explanation

Simple Explanation

पहले हिस्से का relative density factor \(\frac{0.50}{0.20}=2.5\) है। दूसरे हिस्से का factor \(\frac{0.50}{0.80}=0.625\) है। इसलिए पहला 20 प्रतिशत area बहुत अधिक dense है और विकल्प A सही है। केवल population shares दोनों में समान हैं लेकिन area shares बहुत अलग हैं इसलिए density भी अलग है। / The first part has relative density factor \(\frac{0.50}{0.20}=2.5\). The remaining part has factor \(\frac{0.50}{0.80}=0.625\). Therefore the first 20 percent of the area is much denser and option A is correct. Population shares are equal but area shares differ greatly, producing very different densities.

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किसी country की 45 प्रतिशत population केवल 15 प्रतिशत land area में रहती है। उस हिस्से की density national average की कितनी गुनी होगी?

Forty-five percent of a country's population lives in only 15 percent of its land area. How many times the national average density is the density of that part?

Explanation opens after your attempt
Correct Answer

C. 3 गुना3 times

Explanation

Simple Explanation

relative density factor population share को area share से divide करके मिलता है। \(\frac{0.45}{0.15}=3\)। इसलिए उस हिस्से की density national average की तीन गुनी होगी और विकल्प C सही है। यह method actual population या area जाने बिना भी काम करता है। परीक्षा में share-based density comparison के लिए population percentage divided by area percentage सबसे तेज तरीका है। / Relative density factor is population share divided by area share. \(\frac{0.45}{0.15}=3\). Therefore density in that part is three times the national average and option C is correct. The method works without knowing actual population or land area. In examinations dividing population percentage by area percentage is the fastest approach for share-based density comparison.

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यदि किसी country की average density 240 व्यक्ति प्रति वर्ग किलोमीटर है लेकिन 30 प्रतिशत population केवल 10 प्रतिशत area में रहती है तो उस 10 प्रतिशत area का density कितना होगा?

If a country's average density is 240 persons per square kilometre but 30 percent of its population lives in only 10 percent of its area what is the density of that 10 percent area?

Explanation opens after your attempt
Correct Answer

C. 720 व्यक्ति प्रति वर्ग किलोमीटर720 persons per square kilometre

Explanation

Simple Explanation

relative density factor \(\frac{0.30}{0.10}=3\) है। इसलिए selected area density \(240\times3=720\) व्यक्ति प्रति वर्ग किलोमीटर होगा। विकल्प C सही है। actual total population या area जाने की आवश्यकता नहीं क्योंकि percentage shares ही relative concentration बताते हैं। परीक्षा में subregional density के लिए population share divided by area share method बहुत उपयोगी है। / Relative density factor is \(\frac{0.30}{0.10}=3\). Therefore density in the selected area is \(240\times3=720\) persons per square kilometre. Option C is correct. Actual total population or land area is not required because the percentage shares directly show relative concentration. In examinations the population-share divided by area-share method is very useful for subregional density questions.

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यदि 80 प्रतिशत population केवल 40 प्रतिशत area में रहती है और बाकी population शेष area में, तो first portion की density remaining portion से कितनी गुना होगी?

If 80 percent of the population lives in only 40 percent of the area and the remaining population lives in the rest, how many times denser is the first portion than the remaining portion?

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Correct Answer

C. 6 गुना6 times

Explanation

Simple Explanation

First portion की relative density \(0.80/0.40=2\) times regional average है। Remaining portion में 20 percent population 60 percent area में है, इसलिए relative density \(0.20/0.60=1/3\) है। Ratio \(2 \div 1/3 = 6\) है। इसलिए first portion six times denser है और तीसरा विकल्प सही है। / The first portion has relative density \(0.80/0.40=2\) times the regional average. The remaining portion contains 20 percent of the population in 60 percent of the area, giving relative density \(0.20/0.60=1/3\). Their ratio is \(2 \div 1/3=6\). Therefore, the first portion is six times denser and the third option is correct.

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यदि total population का 45 प्रतिशत total area के 15 प्रतिशत हिस्से में रहता है, तो उस हिस्से की density regional average की कितनी गुना होगी?

If 45 percent of the total population lives in 15 percent of the total area, how many times the regional average density is the density of that portion?

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Correct Answer

B. 3 गुना3 times

Explanation

Simple Explanation

Relative density \(\frac{0.45}{0.15}=3\) होती है। इसलिए selected area की density regional average की three times होगी और दूसरा विकल्प सही है। यह result बताता है कि population share यदि area share से कई गुना अधिक हो, तो local density भी average से उतनी ही proportion में higher होगी। / Relative density is \(\frac{0.45}{0.15}=3\). Therefore, the selected area's density is three times the regional average and the second option is correct. This shows that when population share is several times larger than area share, local density exceeds the regional average by the same proportional factor.

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यदि किसी country की 70 प्रतिशत population 35 प्रतिशत area में रहती है और national density 220 व्यक्ति प्रति वर्ग किलोमीटर है तो उस 35 प्रतिशत area का density कितना होगा?

If 70 percent of a country's population lives in 35 percent of its area and national density is 220 persons per square kilometre what is the density of that 35 percent area?

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Correct Answer

C. 440 व्यक्ति प्रति वर्ग किलोमीटर440 persons per square kilometre

Explanation

Simple Explanation

selected area का relative density factor \(\frac{0.70}{0.35}=2\) है। national average 220 है इसलिए selected area density \(220\times2=440\) व्यक्ति प्रति वर्ग किलोमीटर होगा। इसलिए विकल्प C सही है। 400 population और area shares के exact ratio को ignore करता है। परीक्षा में subregional density निकालने के लिए national density को population share divided by area share से multiply करें। / The relative density factor of the selected area is \(\frac{0.70}{0.35}=2\). National average density is 220, so density of the selected area is \(220\times2=440\) persons per square kilometre. Therefore option C is correct. A value of 400 ignores the exact relationship between population and area shares. Multiply national density by population share divided by area share.

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किसी region में 30 प्रतिशत population 10 प्रतिशत area में रहती है। उस area का density पूरे region के average density की कितनी गुनी होगी?

Thirty percent of a region's population lives in 10 percent of its area. How many times the region's average density is the density of that area?

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Correct Answer

B. 3 गुना3 times

Explanation

Simple Explanation

relative density factor population share divided by area share होता है। यहाँ \(\frac{0.30}{0.10}=3\)। इसलिए selected area का density region average का तीन गुना होगा और विकल्प B सही है। इस calculation के लिए actual population या area जानना आवश्यक नहीं है। परीक्षा में share-based density questions के लिए population percentage को area percentage से divide करें। / Relative density factor equals population share divided by area share. Here \(\frac{0.30}{0.10}=3\). Therefore the selected area has three times the average density of the whole region and option B is correct. Actual population and area values are not required. In examinations divide the population percentage by the area percentage for share-based density questions.

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यदि किसी region का 60 प्रतिशत population 30 प्रतिशत area में और शेष population शेष area में रहती है तो कौन-सा हिस्सा अधिक dense है?

If 60 percent of a region's population lives in 30 percent of its area and the remaining population lives in the remaining area which part is denser?

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Correct Answer

A. पहला 30 प्रतिशत areaFirst 30 percent area

Explanation

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पहले हिस्से का relative density factor \(\frac{0.60}{0.30}=2\) है। दूसरे हिस्से का factor \(\frac{0.40}{0.70}\approx0.571\) है। इसलिए पहला 30 प्रतिशत area बहुत अधिक dense है। विकल्प A सही है। परीक्षा में population share और area share की तुलना spatial concentration समझने का प्रभावी तरीका है। केवल absolute population share देखना पर्याप्त नहीं; area share भी आवश्यक है। / The first part has relative density factor \(\frac{0.60}{0.30}=2\). The remaining part has factor \(\frac{0.40}{0.70}\approx0.571\). Therefore the first 30 percent of the area is much denser and option A is correct. In examinations comparing population share with area share is an effective way to understand spatial concentration. Population share alone is insufficient without considering the corresponding area share.

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किसी country की 40 प्रतिशत population केवल 20 प्रतिशत land area में रहती है। उस हिस्से की density country average की कितनी गुनी होगी?

Forty percent of a country's population lives in only 20 percent of its land area. How many times the national average density is the density of that part?

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Correct Answer

B. 2 गुना2 times

Explanation

Simple Explanation

relative density factor population share को area share से divide करके मिलता है। \(\frac{0.40}{0.20}=2\)। इसलिए उस हिस्से का density national average का दो गुना होगा और विकल्प B सही है। यह result total population या actual area जाने बिना भी निकाला जा सकता है। परीक्षा में percentage shares से density comparison करने के लिए share ratio method उपयोगी है। / Relative density factor is found by dividing population share by area share. \(\frac{0.40}{0.20}=2\). Therefore the density of that part is twice the national average and option B is correct. This can be determined without knowing actual total population or land area. In examinations the share-ratio method is useful for comparing density across subregions.

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यदि किसी country की average density 180 व्यक्ति प्रति वर्ग किलोमीटर है लेकिन 25 प्रतिशत population केवल 5 प्रतिशत area में रहती है तो उस 5 प्रतिशत area का density national average की तुलना में कितना होगा?

If a country's average density is 180 persons per square kilometre but 25 percent of its population lives in only 5 percent of its area what is the density of that 5 percent area compared with the national average?

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Correct Answer

C. राष्ट्रीय average का पाँच गुनाFive times national average

Explanation

Simple Explanation

मान लें total population \(P\) और area \(A\) है। national density \(\frac{P}{A}=180\) है। selected area में density \(\frac{0.25P}{0.05A}=5\frac{P}{A}=900\) व्यक्ति प्रति वर्ग किलोमीटर होगा। यह national average का पाँच गुना है। इसलिए विकल्प C सही है। परीक्षा में population share को area share से divide करके relative density factor निकाला जा सकता है। / Let total population be \(P\) and area be \(A\), so national density is \(\frac{P}{A}=180\). Density in the selected area is \(\frac{0.25P}{0.05A}=5\frac{P}{A}=900\) persons per square kilometre. This is five times the national average. Therefore option C is correct. In examinations divide population share by area share to obtain the relative density factor.

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