Class 12 20 percent MCQ Questions

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

यदि population 8 प्रतिशत बढ़े और density 10 प्रतिशत घटे, तो area लगभग कितने प्रतिशत बढ़ा?

If population increases by 8 percent while density decreases by 10 percent, by approximately what percentage did area increase?

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Correct Answer

C. 20 प्रतिशत20 percent

Explanation

Simple Explanation

Area multiplier \(\frac{1.08}{0.90}=1.20\) है। इसलिए area 20 percent बढ़ा और तीसरा विकल्प सही है। Population increase के बावजूद density decline होने का अर्थ है कि denominator area population से faster expand हुआ। ऐसे indirect proportional questions में \(A=P/D\) relation directly use करें। / Area multiplier is \(\frac{1.08}{0.90}=1.20\). Therefore, area increased by 20 percent and the third option is correct. A density decline despite population growth means the denominator, area, expanded faster than population. For indirect proportional questions, use the relation \(A=P/D\) directly.

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

यदि population 36 प्रतिशत घटे और area 20 प्रतिशत घटे, तो density कितने प्रतिशत घटेगी?

If population decreases by 36 percent and area decreases by 20 percent, by what percentage will density decrease?

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Correct Answer

B. 20 प्रतिशत20 percent

Explanation

Simple Explanation

Population multiplier 0.64 और area multiplier 0.80 है। New density multiplier \(0.64/0.80=0.80\) है। इसलिए density 20 percent घटती है और दूसरा विकल्प सही है। Population area से अधिक proportion में घट रही है, इसलिए persons per unit area भी कम होते हैं। / Population multiplier is 0.64 and area multiplier is 0.80. The new density multiplier is \(0.64/0.80=0.80\). Therefore, density decreases by 20 percent and the second option is correct. Population falls by a larger proportion than area, so the number of persons per unit area declines.

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Question 3/6 Expert Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 21

यदि किसी region में arithmetic density 140 है लेकिन cultivated-land density 700 है, तो cultivated land total area का कितना प्रतिशत है?

If a region has an arithmetic density of 140 but a cultivated-land density of 700, what percentage of total area is cultivated?

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Correct Answer

B. 20 प्रतिशत20 percent

Explanation

Simple Explanation

Arithmetic density \(P/A=140\) और cultivated density \(P/C=700\) है। इसलिए \(C/A=140/700=0.20\)। Cultivated land total area का 20 percent है। दूसरा विकल्प सही है। High cultivated-land density limited productive land पर strong population pressure का संकेत दे सकती है even when arithmetic density moderate हो। / Arithmetic density is \(P/A=140\), while cultivated-land density is \(P/C=700\). Therefore, \(C/A=140/700=0.20\). Cultivated land is 20 percent of total area, making the second option correct. A high cultivated-land density can indicate strong population pressure on limited productive land even when arithmetic density is moderate.

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Question 4/6 Expert Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 19

यदि population 44 प्रतिशत बढ़े और area 20 प्रतिशत बढ़े, तो density कितने प्रतिशत बढ़ेगी?

If population increases by 44 percent and area increases by 20 percent, by what percentage will density increase?

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Correct Answer

B. 20 प्रतिशत20 percent

Explanation

Simple Explanation

New density multiplier \(\frac{1.44}{1.20}=1.20\) है। इसलिए density exactly 20 percent बढ़ती है और दूसरा विकल्प सही है। Population growth 44 percent होने के बावजूद area भी 20 percent expand हुआ, इसलिए density increase smaller है। Combined changes में subtraction के बजाय multipliers use करना अधिक accurate है। / The new density multiplier is \(\frac{1.44}{1.20}=1.20\). Therefore, density increases by exactly 20 percent and the second option is correct. Although population grows by 44 percent, area also expands by 20 percent, so the density increase is smaller. For combined changes, using multipliers is more accurate than simple subtraction.

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Question 5/6 Hard Geography The World Population – Distribution, Density and Growth Population Density Class 12 Level 20

यदि population 100000 से 150000 हो जाए और area 400 से 500 वर्ग किलोमीटर हो जाए, तो density कितने प्रतिशत बढ़ेगी?

If population rises from 100000 to 150000 and area increases from 400 to 500 square kilometres, by what percentage does density increase?

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Correct Answer

B. 20 प्रतिशत20 percent

Explanation

Simple Explanation

Original density \(100000/400=250\) है। New density \(150000/500=300\) है। Increase 50 है। Percentage increase \(\frac{50}{250}\times100=20\%\) है। इसलिए दूसरा विकल्प सही है। Population 50 percent बढ़ी, लेकिन area भी 25 percent बढ़ा, इसलिए density increase केवल 20 percent है। / Original density is \(100000/400=250\). New density is \(150000/500=300\). The increase is 50. Percentage increase is \(\frac{50}{250}\times100=20\%\). Therefore, the second option is correct. Population rises by 50 percent, but area also rises by 25 percent, so density increases by only 20 percent.

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

एक region की density 300 से घटकर 240 व्यक्ति प्रति वर्ग किलोमीटर हो गई। Percentage decrease कितना है?

A region's density falls from 300 to 240 persons per square kilometre. What is the percentage decrease?

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Correct Answer

C. 20 प्रतिशत20 percent

Explanation

Simple Explanation

Decrease \(300 - 240 = 60\) है। Percentage decrease \(\frac{60}{300} \times 100 = 20\%\) है। इसलिए तीसरा विकल्प सही है। 60 absolute decrease है, percentage नहीं। परीक्षा में decrease का percentage original density के relative calculate करें, new density के relative नहीं। / The decrease is \(300 - 240 = 60\). Percentage decrease is \(\frac{60}{300} \times 100 = 20\%\). Therefore, the third option is correct. The value 60 is the absolute decrease, not the percentage. In examinations, calculate percentage decrease relative to the original density rather than the new density.

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20 percent MCQ Questions for Class 12

Practice Questions

यदि population 8 प्रतिशत बढ़े और density 10 प्रतिशत घटे, तो area लगभग कितने प्रतिशत बढ़ा?

Simple Explanation

यदि population 36 प्रतिशत घटे और area 20 प्रतिशत घटे, तो density कितने प्रतिशत घटेगी?

Simple Explanation

यदि किसी region में arithmetic density 140 है लेकिन cultivated-land density 700 है, तो cultivated land total area का कितना प्रतिशत है?

Simple Explanation

यदि population 44 प्रतिशत बढ़े और area 20 प्रतिशत बढ़े, तो density कितने प्रतिशत बढ़ेगी?

Simple Explanation

यदि population 100000 से 150000 हो जाए और area 400 से 500 वर्ग किलोमीटर हो जाए, तो density कितने प्रतिशत बढ़ेगी?

Simple Explanation

एक region की density 300 से घटकर 240 व्यक्ति प्रति वर्ग किलोमीटर हो गई। Percentage decrease कितना है?

Simple Explanation

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20 percent MCQ Questions for Class 12

Practice Questions

यदि population 8 प्रतिशत बढ़े और density 10 प्रतिशत घटे, तो area लगभग कितने प्रतिशत बढ़ा?

Simple Explanation

यदि population 36 प्रतिशत घटे और area 20 प्रतिशत घटे, तो density कितने प्रतिशत घटेगी?

Simple Explanation

यदि किसी region में arithmetic density 140 है लेकिन cultivated-land density 700 है, तो cultivated land total area का कितना प्रतिशत है?

Simple Explanation

यदि population 44 प्रतिशत बढ़े और area 20 प्रतिशत बढ़े, तो density कितने प्रतिशत बढ़ेगी?

Simple Explanation

यदि population 100000 से 150000 हो जाए और area 400 से 500 वर्ग किलोमीटर हो जाए, तो density कितने प्रतिशत बढ़ेगी?

Simple Explanation

एक region की density 300 से घटकर 240 व्यक्ति प्रति वर्ग किलोमीटर हो गई। Percentage decrease कितना है?

Simple Explanation

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