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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(x=\sqrt{7}+\sqrt{28}\) है तो (x) का सही सरल रूप और प्रकार क्या है?

If \(x=\sqrt{7}+\sqrt{28}\), what is the correct simplified form and type of (x)?

Explanation opens after your attempt
Correct Answer

A. \(3\sqrt{7}\) और अपरिमेय\(3\sqrt{7}\) and irrational

Step 1

Concept

Since \(28=4\cdot 7\), \(\sqrt{28}=2\sqrt{7}\).

Step 2

Why this answer is correct

Now \(\sqrt{7}+2\sqrt{7}=3\sqrt{7}\), and \(\sqrt{7}\) is irrational.

Step 3

Exam Tip

In exams, combine like radicals by adding their coefficients. चरण 1: \(28=4\cdot 7\) इसलिए \(\sqrt{28}=2\sqrt{7}\)। चरण 2: अब \(\sqrt{7}+2\sqrt{7}=3\sqrt{7}\) और \(\sqrt{7}\) अपरिमेय है। चरण 3: परीक्षा में समान वर्गमूल वाले पदों को गुणांक जोड़कर सरल करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प \(\sqrt{2}+\sqrt{18}\) और \(\sqrt{8}+\sqrt{12}\) की तुलना के लिए सही है?

Which option is correct for comparing \(\sqrt{2}+\sqrt{18}\) and \(\sqrt{8}+\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

A. पहला बड़ा हैThe first is greater

Step 1

Concept

\(\sqrt{2}+\sqrt{18}=4\sqrt{2}\).

Step 2

Why this answer is correct

\(\sqrt{8}+\sqrt{12}=2\sqrt{2}+2\sqrt{3}\). Since \(\sqrt{3}>\sqrt{2}\), the second expression is greater.

Step 3

Exam Tip

Simplify first and compare carefully. चरण 1: \(\sqrt{2}+\sqrt{18}=\sqrt{2}+3\sqrt{2}=4\sqrt{2}\)। चरण 2: \(\sqrt{8}+\sqrt{12}=2\sqrt{2}+2\sqrt{3}\)। तुलना में \(4\sqrt{2}\) लगभग (5.66) और दूसरा लगभग (6.29) लगता है लेकिन शुद्ध तुलना में \(2\sqrt{2}\) और \(2\sqrt{3}\) के कारण दूसरा बड़ा है। चरण 3: अनुमान और सरल रूप दोनों जांचें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प \(\sqrt{98}-\sqrt{50}\) का सही रूप और प्रकार देता है?

Which option gives the correct form and type of \(\sqrt{98}-\sqrt{50}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{2}\) और अपरिमेय\(2\sqrt{2}\) and irrational

Step 1

Concept

\(\sqrt{98}=7\sqrt{2}\) and \(\sqrt{50}=5\sqrt{2}\).

Step 2

Why this answer is correct

The difference is \(2\sqrt{2}\), which is irrational.

Step 3

Exam Tip

Directly subtracting numbers inside radicals is wrong. चरण 1: \(\sqrt{98}=7\sqrt{2}\) और \(\sqrt{50}=5\sqrt{2}\)। चरण 2: अंतर \(2\sqrt{2}\) है जो अपरिमेय है। चरण 3: वर्गमूलों के अंदर की संख्याओं को सीधे घटाना गलत है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प \(\sqrt{32}+\sqrt{50}-\sqrt{18}\) का सही प्रकार बताता है?

Which option correctly describes \(\sqrt{32}+\sqrt{50}-\sqrt{18}\)?

Explanation opens after your attempt
Correct Answer

A. यह \(6\sqrt{2}\) है और अपरिमेय हैIt is \(6\sqrt{2}\) and irrational

Step 1

Concept

\(\sqrt{32}=4\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\), and \(\sqrt{18}=3\sqrt{2}\).

Step 2

Why this answer is correct

The result is \(6\sqrt{2}\) which is irrational.

Step 3

Exam Tip

Add and subtract coefficients of like radicals. चरण 1: \(\sqrt{32}=4\sqrt{2}\) और \(\sqrt{50}=5\sqrt{2}\) और \(\sqrt{18}=3\sqrt{2}\)। चरण 2: परिणाम \(6\sqrt{2}\) है जो अपरिमेय है। चरण 3: समान मूल वाले पदों के गुणांक जोड़ें और घटाएं।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

\(\sqrt{75}+\sqrt{12}\) किसके बराबर है और उसका प्रकार क्या है?

What is \(\sqrt{75}+\sqrt{12}\) equal to and what is its type?

Explanation opens after your attempt
Correct Answer

A. \(7\sqrt{3}\) और अपरिमेय\(7\sqrt{3}\) and irrational

Step 1

Concept

\(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\).

Step 2

Why this answer is correct

The sum is \(7\sqrt{3}\) which is irrational.

Step 3

Exam Tip

Simplify radicals before adding them. चरण 1: \(\sqrt{75}=5\sqrt{3}\) और \(\sqrt{12}=2\sqrt{3}\)। चरण 2: योग \(7\sqrt{3}\) है जो अपरिमेय है। चरण 3: अलग-अलग वर्गमूलों को जोड़ने से पहले सरल रूप में बदलें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सा विकल्प \(\sqrt{18}-\sqrt{8}\) का सही प्रकार बताता है?

Which option correctly describes \(\sqrt{18}-\sqrt{8}\)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेय क्योंकि उत्तर \(\sqrt{2}\) हैIrrational because the answer is \(\sqrt{2}\)

Step 1

Concept

\(\sqrt{18}=3\sqrt{2}\) and \(\sqrt{8}=2\sqrt{2}\).

Step 2

Why this answer is correct

The difference is \(\sqrt{2}\) which is irrational.

Step 3

Exam Tip

Do not subtract the numbers inside square roots directly. चरण 1: \(\sqrt{18}=3\sqrt{2}\) और \(\sqrt{8}=2\sqrt{2}\)। चरण 2: अंतर \(\sqrt{2}\) है जो अपरिमेय है। चरण 3: वर्गमूल घटाते समय भीतर की संख्याओं को सीधे न घटाएं।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

\(\sqrt{2}\) और \(\sqrt{8}\) के बीच संबंध क्या है?

What is the relation between \(\sqrt{2}\) and \(\sqrt{8}\)?

Explanation opens after your attempt
Correct Answer

B. दोनों अपरिमेय हैं और \(\sqrt{8}=2\sqrt{2}\)Both are irrational and \(\sqrt{8}=2\sqrt{2}\)

Step 1

Concept

Since \(8=4\cdot 2\) we have \(\sqrt{8}=2\sqrt{2}\).

Step 2

Why this answer is correct

\(\sqrt{2}\) is irrational and its double is also irrational.

Step 3

Exam Tip

Compare like radicals after simplifying them. चरण 1: \(8=4\cdot 2\) है इसलिए \(\sqrt{8}=2\sqrt{2}\)। चरण 2: \(\sqrt{2}\) अपरिमेय है और उसका दुगुना भी अपरिमेय है। चरण 3: समान मूल वाली संख्याओं को सरल रूप में तुलना करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(x=\sqrt{2}+\sqrt{3}\) है तो (x) के बारे में सही निष्कर्ष क्या है?

If \(x=\sqrt{2}+\sqrt{3}\) then what is the correct conclusion about (x)?

Explanation opens after your attempt
Correct Answer

B. (x) अपरिमेय है(x) is irrational

Step 1

Concept

Suppose \(\sqrt{2}+\sqrt{3}\) is rational.

Step 2

Why this answer is correct

Squaring gives \(5+2\sqrt{6}\) so \(\sqrt{6}\) would be rational which is false.

Step 3

Exam Tip

Do not decide the sum of two different irrational numbers without reasoning. चरण 1: मान लें \(\sqrt{2}+\sqrt{3}\) परिमेय है। चरण 2: वर्ग करने पर \(5+2\sqrt{6}\) परिमेय होना चाहिए इसलिए \(\sqrt{6}\) परिमेय मिलेगा जो गलत है। चरण 3: दो अलग अपरिमेय संख्याओं के योग को सीधे परिमेय या अपरिमेय न मानें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन सी संख्या निश्चित रूप से अपरिमेय है?

Which number is definitely irrational?

Explanation opens after your attempt
Correct Answer

C. \(\sqrt{2}+\sqrt{8}\)

Step 1

Concept

Simplify \(\sqrt{8}=2\sqrt{2}\).

Step 2

Why this answer is correct

\(\sqrt{2}+\sqrt{8}=3\sqrt{2}\) and \(\sqrt{2}\) is irrational.

Step 3

Exam Tip

Do not choose the answer before simplifying square roots. चरण 1: सरल करें \(\sqrt{8}=2\sqrt{2}\)। चरण 2: \(\sqrt{2}+\sqrt{8}=3\sqrt{2}\) है और \(\sqrt{2}\) अपरिमेय है। चरण 3: वर्गमूलों को सरल किए बिना उत्तर जल्दी न चुनें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{6}+\sqrt{5}\), तो \(x^3+\frac{1}{x^3}\) का मान और प्रकृति क्या है?

If \(x=\sqrt{6}+\sqrt{5}\), what is the value and nature of \(x^3+\frac{1}{x^3}\)?

Explanation opens after your attempt
Correct Answer

A. \(42\sqrt{6}\), अपरिमेय\(42\sqrt{6}\), irrational

Step 1

Concept

(\(\sqrt{6}+\sqrt{5}\)\(\sqrt{6}-\sqrt{5}\)=1), so \(\frac{1}{x}=\sqrt{6}-\sqrt{5}\).

Step 2

Why this answer is correct

\(x+\frac{1}{x}=2\sqrt{6}\), hence (x-3+\frac{1}{x-3}=\(2\sqrt{6}\)3-3\(2\sqrt{6}\)=42\sqrt{6}).

Step 3

Exam Tip

In cube-type questions, finding \(x+\frac{1}{x}\) first is the easier method. चरण 1: (\(\sqrt{6}+\sqrt{5}\)\(\sqrt{6}-\sqrt{5}\)=1), इसलिए \(\frac{1}{x}=\sqrt{6}-\sqrt{5}\)। चरण 2: \(x+\frac{1}{x}=2\sqrt{6}\), अतः (x-3+\frac{1}{x-3}=\(2\sqrt{6}\)3-3\(2\sqrt{6}\)=42\sqrt{6})। चरण 3: घन वाले प्रश्नों में पहले \(x+\frac{1}{x}\) निकालना आसान तरीका है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\sqrt{45}\) और \(2\sqrt{5}\) के अंतर को सही बताता है?

Which option correctly gives the difference between \(\sqrt{45}\) and \(2\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{5}\)

Step 1

Concept

\(\sqrt{45}=3\sqrt{5}\).

Step 2

Why this answer is correct

The difference is \(3\sqrt{5}-2\sqrt{5}=\sqrt{5}\), which is irrational.

Step 3

Exam Tip

For like surds, subtract only the coefficients. चरण 1: \(\sqrt{45}=3\sqrt{5}\) है। चरण 2: अंतर \(3\sqrt{5}-2\sqrt{5}=\sqrt{5}\), जो अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल गुणांक घटाएँ।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{3}+\sqrt{5}\) और \(y=\sqrt{5}+\sqrt{7}\), तो (y-x) की प्रकृति क्या है?

If \(x=\sqrt{3}+\sqrt{5}\) and \(y=\sqrt{5}+\sqrt{7}\), what is the nature of (y-x)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेयIrrational

Step 1

Concept

(y-x=\(\sqrt{5}+\sqrt{7}\)-\(\sqrt{3}+\sqrt{5}\)).

Step 2

Why this answer is correct

\(\sqrt{5}\) cancels and \(\sqrt{7}-\sqrt{3}\) remains, which is irrational.

Step 3

Exam Tip

After like terms cancel, check the nature of the remaining surds. चरण 1: (y-x=\(\sqrt{5}+\sqrt{7}\)-\(\sqrt{3}+\sqrt{5}\))। चरण 2: \(\sqrt{5}\) कट जाता है और \(\sqrt{7}-\sqrt{3}\) बचता है, जो अपरिमेय है। चरण 3: समान पद कटने के बाद बचे हुए मूलों की प्रकृति देखें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=1+\sqrt{2}+\sqrt{3}\), तो (x-1) की प्रकृति क्या है?

If \(x=1+\sqrt{2}+\sqrt{3}\), what is the nature of (x-1)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेयIrrational

Step 1

Concept

\(x-1=\sqrt{2}+\sqrt{3}\).

Step 2

Why this answer is correct

\(\sqrt{2}+\sqrt{3}\) is irrational, because assuming it rational and squaring would force \(\sqrt{6}\) to be rational.

Step 3

Exam Tip

Check sums of different surds carefully. चरण 1: \(x-1=\sqrt{2}+\sqrt{3}\) है। चरण 2: \(\sqrt{2}+\sqrt{3}\) अपरिमेय है, क्योंकि इसे परिमेय मानने पर वर्ग करने से \(\sqrt{6}\) परिमेय निकलने का विरोध आता है। चरण 3: अलग-अलग मूलों का योग सावधानी से जाँचें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(a=3+\sqrt{5}\), तो \(a^2-6a\) का मान क्या है?

If \(a=3+\sqrt{5}\), what is the value of \(a^2-6a\)?

Explanation opens after your attempt
Correct Answer

A. (-4)

Step 1

Concept

(a-2-6a=a(a-6)).

Step 2

Why this answer is correct

\(a-6=\sqrt{5}-3\), so (a(a-6)=\(3+\sqrt{5}\)\(\sqrt{5}-3\)=5-9=-4).

Step 3

Exam Tip

Recognize the hidden conjugate form. चरण 1: (a-2-6a=a(a-6)) है। चरण 2: \(a-6=\sqrt{5}-3\), इसलिए (a(a-6)=\(3+\sqrt{5}\)\(\sqrt{5}-3\)=5-9=-4)। चरण 3: छिपे हुए संयुग्मी रूप को पहचानें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\sqrt{3}+\sqrt{6}\) और \(\sqrt{12}\) के बीच सही तुलना देता है?

Which option gives the correct comparison between \(\sqrt{3}+\sqrt{6}\) and \(\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}+\sqrt{6}>\sqrt{12}\)

Step 1

Concept

All terms are positive and \(\sqrt{6}>0\).

Step 2

Why this answer is correct

Since \(\sqrt{12}=2\sqrt{3}\) and \(\sqrt{6}>\sqrt{3}\), the sum \(\sqrt{3}+\sqrt{6}\) is greater than \(2\sqrt{3}\).

Step 3

Exam Tip

For comparison, convert what you can and use positivity. चरण 1: सभी पद धनात्मक हैं और \(\sqrt{6}>0\)। चरण 2: \(\sqrt{3}+\sqrt{6}\), \(\sqrt{3}\) से बड़ा है और \(\sqrt{12}=2\sqrt{3}\) है; संख्यात्मक रूप से \(\sqrt{6}>\sqrt{3}\), इसलिए योग \(2\sqrt{3}\) से बड़ा है। चरण 3: तुलना में समान मूल में बदलना और धनात्मकता देखना मदद करता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{8}+\sqrt{18}\), तो \(\frac{x}{\sqrt{2}}\) का मान क्या है?

If \(x=\sqrt{8}+\sqrt{18}\), what is the value of \(\frac{x}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\) and \(\sqrt{18}=3\sqrt{2}\).

Step 2

Why this answer is correct

\(x=5\sqrt{2}\), so \(\frac{x}{\sqrt{2}}=5\).

Step 3

Exam Tip

Division is easier after combining like surds. चरण 1: \(\sqrt{8}=2\sqrt{2}\) और \(\sqrt{18}=3\sqrt{2}\)। चरण 2: \(x=5\sqrt{2}\), इसलिए \(\frac{x}{\sqrt{2}}=5\)। चरण 3: समान मूल वाले पदों को जोड़ने के बाद भाग देना आसान होता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=5-\sqrt{24}\), तो \(\frac{1}{x}\) का सही रूप कौन-सा है?

If \(x=5-\sqrt{24}\), which is the correct form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(5+\sqrt{24}\)

Step 1

Concept

(\(5-\sqrt{24}\)\(5+\sqrt{24}\)=25-24=1).

Step 2

Why this answer is correct

Therefore \(5+\sqrt{24}\) is the reciprocal of \(5-\sqrt{24}\).

Step 3

Exam Tip

If conjugates multiply to (1), the reciprocal is directly the conjugate. चरण 1: (\(5-\sqrt{24}\)\(5+\sqrt{24}\)=25-24=1)। चरण 2: इसलिए \(5+\sqrt{24}\), \(5-\sqrt{24}\) का व्युत्क्रम है। चरण 3: यदि संयुग्मी गुणन (1) दे, तो व्युत्क्रम सीधे संयुग्मी होता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(a=\sqrt{2}+\sqrt{3}+\sqrt{5}\), तो \(a^2\) में कौन-सा अपरिमेय पद अवश्य आएगा?

If \(a=\sqrt{2}+\sqrt{3}+\sqrt{5}\), which irrational term must appear in \(a^2\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{6}+2\sqrt{10}+2\sqrt{15}\)

Step 1

Concept

In the square of three terms, pairwise products appear along with individual squares.

Step 2

Why this answer is correct

Thus \(a^2=10+2\sqrt{6}+2\sqrt{10}+2\sqrt{15}\).

Step 3

Exam Tip

While squaring a sum of many surds, write all pairwise products. चरण 1: तीन पदों के वर्ग में अलग-अलग वर्गों के साथ दो-दो पदों के गुणन भी आते हैं। चरण 2: इसलिए \(a^2=10+2\sqrt{6}+2\sqrt{10}+2\sqrt{15}\) होगा। चरण 3: कई मूलों के योग का वर्ग करते समय सभी जोड़ीदार गुणन लिखें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\frac{1}{\sqrt{5}+\sqrt{2}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{1}{\sqrt{5}+\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{5}-\sqrt{2}}{3}\)

Step 1

Concept

The conjugate of the denominator is \(\sqrt{5}-\sqrt{2}\).

Step 2

Why this answer is correct

The denominator becomes (5-2=3), so the form is \(\frac{\sqrt{5}-\sqrt{2}}{3}\).

Step 3

Exam Tip

For a sum of two surds, the conjugate changes the sign between them. चरण 1: हर का संयुग्मी \(\sqrt{5}-\sqrt{2}\) है। चरण 2: हर (5-2=3) बनता है, इसलिए रूप \(\frac{\sqrt{5}-\sqrt{2}}{3}\) है। चरण 3: दो मूलों के योग में संयुग्मी का चिह्न बदलता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\frac{\sqrt{3}}{\sqrt{2}}\), तो \(x^2\) और (x) की प्रकृति के बारे में सही कथन कौन-सा है?

If \(x=\frac{\sqrt{3}}{\sqrt{2}}\), which statement about \(x^2\) and (x) is correct?

Explanation opens after your attempt
Correct Answer

A. (x) अपरिमेय है और \(x^2\) परिमेय है(x) is irrational and \(x^2\) is rational

Step 1

Concept

\(x=\sqrt{\frac{3}{2}}\), which is irrational because \(\frac{3}{2}\) is not a perfect square of a rational number.

Step 2

Why this answer is correct

\(x^2=\frac{3}{2}\), which is rational.

Step 3

Exam Tip

The square of an irrational number can sometimes be rational. चरण 1: \(x=\sqrt{\frac{3}{2}}\) है, जो अपरिमेय है क्योंकि \(\frac{3}{2}\) परिमेय पूर्ण वर्ग नहीं है। चरण 2: \(x^2=\frac{3}{2}\), जो परिमेय है। चरण 3: किसी अपरिमेय संख्या का वर्ग कभी-कभी परिमेय हो सकता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{11}+\sqrt{7}\), तो \(x^2-18\) का मान क्या है?

If \(x=\sqrt{11}+\sqrt{7}\), what is the value of \(x^2-18\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{77}\)

Step 1

Concept

\(x^2=11+7+2\sqrt{77}=18+2\sqrt{77}\).

Step 2

Why this answer is correct

Therefore \(x^2-18=2\sqrt{77}\), which is irrational.

Step 3

Exam Tip

In the square of a sum of different surds, the middle term is the key. चरण 1: \(x^2=11+7+2\sqrt{77}=18+2\sqrt{77}\)। चरण 2: इसलिए \(x^2-18=2\sqrt{77}\), जो अपरिमेय है। चरण 3: दो अलग मूलों के योग का वर्ग करते समय बीच वाला पद मुख्य होता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(4\sqrt{3}\) और \(3\sqrt{5}\) की सही तुलना करता है?

Which option correctly compares \(4\sqrt{3}\) and \(3\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. \(4\sqrt{3}>3\sqrt{5}\)

Step 1

Concept

Both numbers are positive, so compare their squares.

Step 2

Why this answer is correct

(\(4\sqrt{3}\)2=48) and (\(3\sqrt{5}\)2=45), so \(4\sqrt{3}\) is greater.

Step 3

Exam Tip

Squaring is safe for comparing positive surds. चरण 1: दोनों संख्याएँ धनात्मक हैं, इसलिए वर्ग करके तुलना करें। चरण 2: (\(4\sqrt{3}\)2=48) और (\(3\sqrt{5}\)2=45), इसलिए \(4\sqrt{3}\) बड़ा है। चरण 3: धनात्मक मूलों की तुलना में वर्ग करना सुरक्षित रहता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\sqrt{2}+\sqrt{8}+\sqrt{32}+\sqrt{128}\) का सरल रूप है?

Which option is the simplified form of \(\sqrt{2}+\sqrt{8}+\sqrt{32}+\sqrt{128}\)?

Explanation opens after your attempt
Correct Answer

A. \(15\sqrt{2}\)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\), \(\sqrt{32}=4\sqrt{2}\), and \(\sqrt{128}=8\sqrt{2}\).

Step 2

Why this answer is correct

The sum is ((1+2+4+8)\sqrt{2}=15\sqrt{2}).

Step 3

Exam Tip

Recognize the pattern of perfect-square factors. चरण 1: \(\sqrt{8}=2\sqrt{2}\), \(\sqrt{32}=4\sqrt{2}\), और \(\sqrt{128}=8\sqrt{2}\)। चरण 2: योग ((1+2+4+8)\sqrt{2}=15\sqrt{2}) है। चरण 3: गुणनखंडों में पूर्ण वर्गों का क्रम पहचानें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{7}-\sqrt{3}\), तो \(x^2\) किसके बराबर है?

If \(x=\sqrt{7}-\sqrt{3}\), what is \(x^2\) equal to?

Explanation opens after your attempt
Correct Answer

A. \(10-2\sqrt{21}\)

Step 1

Concept

Use ((a-b)2=a-2-2ab+b-2).

Step 2

Why this answer is correct

\(x^2=7-2\sqrt{21}+3=10-2\sqrt{21}\).

Step 3

Exam Tip

Do not forget the negative sign of the middle term in the square of a difference. चरण 1: ((a-b)2=a-2-2ab+b-2) का प्रयोग करें। चरण 2: \(x^2=7-2\sqrt{21}+3=10-2\sqrt{21}\)। चरण 3: अंतर के वर्ग में बीच वाले पद का ऋण चिह्न न भूलें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\sqrt{18}+\sqrt{50}-\sqrt{8}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{18}+\sqrt{50}-\sqrt{8}\)?

Explanation opens after your attempt
Correct Answer

A. \(6\sqrt{2}\)

Step 1

Concept

\(\sqrt{18}=3\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\), and \(\sqrt{8}=2\sqrt{2}\).

Step 2

Why this answer is correct

\(3\sqrt{2}+5\sqrt{2}-2\sqrt{2}=6\sqrt{2}\).

Step 3

Exam Tip

Keep the signs carefully while adding or subtracting coefficients. चरण 1: \(\sqrt{18}=3\sqrt{2}\), \(\sqrt{50}=5\sqrt{2}\), और \(\sqrt{8}=2\sqrt{2}\)। चरण 2: \(3\sqrt{2}+5\sqrt{2}-2\sqrt{2}=6\sqrt{2}\)। चरण 3: चिह्नों को ध्यान से रखकर गुणांक जोड़ें या घटाएँ।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

किस विकल्प में (x) अपरिमेय है, पर \(x+\frac{1}{x}\) परिमेय है?

In which option is (x) irrational but \(x+\frac{1}{x}\) rational?

Explanation opens after your attempt
Correct Answer

A. \(x=3+\sqrt{8}\)

Step 1

Concept

\(3+\sqrt{8}=3+2\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

Its reciprocal is \(3-\sqrt{8}\), because (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=1). Hence the sum is (6), which is rational.

Step 3

Exam Tip

When conjugates multiply to (1), the reciprocal is easy to identify. चरण 1: \(3+\sqrt{8}=3+2\sqrt{2}\) अपरिमेय है। चरण 2: इसका व्युत्क्रम \(3-\sqrt{8}\) है, क्योंकि (\(3+\sqrt{8}\)\(3-\sqrt{8}\)=1)। इसलिए योग (6) परिमेय है। चरण 3: जिन संयुग्मियों का गुणन (1) हो, वहाँ व्युत्क्रम तुरंत मिल सकता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(a=\sqrt{6}+\sqrt{2}\) और \(b=\sqrt{6}-\sqrt{2}\), तो \(a^2-b^2\) का मान क्या है?

If \(a=\sqrt{6}+\sqrt{2}\) and \(b=\sqrt{6}-\sqrt{2}\), what is the value of \(a^2-b^2\)?

Explanation opens after your attempt
Correct Answer

A. \(8\sqrt{3}\)

Step 1

Concept

Use (a-2-b-2=(a-b)(a+b)).

Step 2

Why this answer is correct

\(a-b=2\sqrt{2}\) and \(a+b=2\sqrt{6}\), so the product is \(4\sqrt{12}=8\sqrt{3}\).

Step 3

Exam Tip

Identities make the solution quicker and cleaner. चरण 1: (a-2-b-2=(a-b)(a+b)) लगाएँ। चरण 2: \(a-b=2\sqrt{2}\) और \(a+b=2\sqrt{6}\), इसलिए गुणन \(4\sqrt{12}=8\sqrt{3}\) है। चरण 3: पहचान सूत्र से हल तेज और साफ होता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=2+\sqrt{3}\), तो \(x^2+\frac{1}{x^2}\) का मान क्या है?

If \(x=2+\sqrt{3}\), what is the value of \(x^2+\frac{1}{x^2}\)?

Explanation opens after your attempt
Correct Answer

A. (14)

Step 1

Concept

\(\frac{1}{2+\sqrt{3}}=2-\sqrt{3}\).

Step 2

Why this answer is correct

Hence \(x+\frac{1}{x}=4\), so \(x^2+\frac{1}{x^2}=4^2-2=14\).

Step 3

Exam Tip

Finding \(x+\frac{1}{x}\) first saves long calculation. चरण 1: \(\frac{1}{2+\sqrt{3}}=2-\sqrt{3}\) होता है। चरण 2: इसलिए \(x+\frac{1}{x}=4\), अतः (x-2+\frac{1}{x-2}=(4)2-2=14)। चरण 3: पहले \(x+\frac{1}{x}\) निकालना लंबी गणना बचाता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\frac{\sqrt{12}+\sqrt{27}}{\sqrt{3}}\) का सही मान देता है?

Which option gives the correct value of \(\frac{\sqrt{12}+\sqrt{27}}{\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

Write \(\sqrt{12}=2\sqrt{3}\) and \(\sqrt{27}=3\sqrt{3}\).

Step 2

Why this answer is correct

The numerator is \(5\sqrt{3}\), so \(\frac{5\sqrt{3}}{\sqrt{3}}=5\).

Step 3

Exam Tip

Combine like surds before division. चरण 1: \(\sqrt{12}=2\sqrt{3}\) और \(\sqrt{27}=3\sqrt{3}\) लिखें। चरण 2: ऊपर का योग \(5\sqrt{3}\) है, इसलिए \(\frac{5\sqrt{3}}{\sqrt{3}}=5\)। चरण 3: भाग से पहले समान मूल वाले पदों को जोड़ें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{5}+\sqrt{2}\) और \(y=\sqrt{5}-\sqrt{2}\), तो \(x^2+y^2\) का मान क्या है?

If \(x=\sqrt{5}+\sqrt{2}\) and \(y=\sqrt{5}-\sqrt{2}\), what is the value of \(x^2+y^2\)?

Explanation opens after your attempt
Correct Answer

A. (14)

Step 1

Concept

(x) and (y) are conjugates.

Step 2

Why this answer is correct

In (\(\sqrt{5}+\sqrt{2}\)2+\(\sqrt{5}-\sqrt{2}\)2), the middle irrational terms cancel and the value is (2(5+2)=14).

Step 3

Exam Tip

When adding squares of conjugates, the middle terms vanish. चरण 1: (x) और (y) संयुग्मी रूप में हैं। चरण 2: (\(\sqrt{5}+\sqrt{2}\)2+\(\sqrt{5}-\sqrt{2}\)2) में बीच के अपरिमेय पद कट जाते हैं और मान (2(5+2)=14) मिलता है। चरण 3: दो संयुग्मी वर्गों का योग लेते समय बीच वाले पद नहीं बचते।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\frac{\sqrt{10}+\sqrt{6}}{\sqrt{10}-\sqrt{6}}\), तो (x) का सरल रूप क्या है?

If \(x=\frac{\sqrt{10}+\sqrt{6}}{\sqrt{10}-\sqrt{6}}\), what is the simplified form of (x)?

Explanation opens after your attempt
Correct Answer

A. \(4+\sqrt{15}\)

Step 1

Concept

Multiply by \(\sqrt{10}+\sqrt{6}\) to rationalize the denominator.

Step 2

Why this answer is correct

The numerator becomes (\(\sqrt{10}+\sqrt{6}\)2=16+2\sqrt{60}) and the denominator is (10-6=4), so the value is \(4+\sqrt{15}\).

Step 3

Exam Tip

In conjugate fractions, clear the denominator first. चरण 1: हर को परिमेय बनाने के लिए \(\sqrt{10}+\sqrt{6}\) से गुणा करें। चरण 2: ऊपर (\(\sqrt{10}+\sqrt{6}\)2=16+2\sqrt{60}) और नीचे (10-6=4) मिलता है, इसलिए मान \(4+\sqrt{15}\) है। चरण 3: संयुग्मी वाले भिन्नों में हर को पहले साफ करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\frac{\sqrt{7}+\sqrt{5}}{\sqrt{7}-\sqrt{5}}+\frac{\sqrt{7}-\sqrt{5}}{\sqrt{7}+\sqrt{5}}\), तो (x) का मान और प्रकृति क्या है?

If \(x=\frac{\sqrt{7}+\sqrt{5}}{\sqrt{7}-\sqrt{5}}+\frac{\sqrt{7}-\sqrt{5}}{\sqrt{7}+\sqrt{5}}\), what is the value and nature of (x)?

Explanation opens after your attempt
Correct Answer

A. (12), परिमेय(12), rational

Step 1

Concept

First observe the common structure and take \(a=\sqrt{7}+\sqrt{5}\) and \(b=\sqrt{7}-\sqrt{5}\).

Step 2

Why this answer is correct

\(\frac{a}{b}+\frac{b}{a}=\frac{a^2+b^2}{ab}\). Here \(a^2+b^2=24\) and (ab=2), so (x=12).

Step 3

Exam Tip

For fractions with conjugate surds, use substitution instead of expanding everything directly. चरण 1: पहले दोनों भिन्नों का साझा रूप देखें और \(a=\sqrt{7}+\sqrt{5}\) तथा \(b=\sqrt{7}-\sqrt{5}\) मानें। चरण 2: \(\frac{a}{b}+\frac{b}{a}=\frac{a^2+b^2}{ab}\) होगा। यहाँ \(a^2+b^2=24\) और (ab=2) इसलिए (x=12) है। चरण 3: संयुग्मी मूलों वाले भिन्नों में सीधे लंबा प्रसार करने के बजाय (a) और (b) रखकर हल करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{2}+\sqrt{8}+\sqrt{18}+\sqrt{32}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{2}+\sqrt{8}+\sqrt{18}+\sqrt{32}\)?

Explanation opens after your attempt
Correct Answer

A. \(10\sqrt{2}\)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\), \(\sqrt{18}=3\sqrt{2}\), and \(\sqrt{32}=4\sqrt{2}\).

Step 2

Why this answer is correct

The total is \(1\sqrt{2}+2\sqrt{2}+3\sqrt{2}+4\sqrt{2}=10\sqrt{2}\).

Step 3

Exam Tip

In ordered surds, identify the coefficient pattern. चरण 1: \(\sqrt{8}=2\sqrt{2}\), \(\sqrt{18}=3\sqrt{2}\), और \(\sqrt{32}=4\sqrt{2}\)। चरण 2: कुल योग \(1\sqrt{2}+2\sqrt{2}+3\sqrt{2}+4\sqrt{2}=10\sqrt{2}\) है। चरण 3: क्रमबद्ध मूलों में गुणांक का पैटर्न पहचानें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{48}+\sqrt{75}-\sqrt{27}\) को सरल करके देता है?

Which option gives the simplified form of \(\sqrt{48}+\sqrt{75}-\sqrt{27}\)?

Explanation opens after your attempt
Correct Answer

B. \(6\sqrt{3}\)

Step 1

Concept

\(\sqrt{48}=4\sqrt{3}\), \(\sqrt{75}=5\sqrt{3}\), and \(\sqrt{27}=3\sqrt{3}\).

Step 2

Why this answer is correct

\(4\sqrt{3}+5\sqrt{3}-3\sqrt{3}=6\sqrt{3}\).

Step 3

Exam Tip

For like surds, work with the coefficients. चरण 1: \(\sqrt{48}=4\sqrt{3}\), \(\sqrt{75}=5\sqrt{3}\), और \(\sqrt{27}=3\sqrt{3}\)। चरण 2: \(4\sqrt{3}+5\sqrt{3}-3\sqrt{3}=6\sqrt{3}\)। चरण 3: एक ही मूल वाले पदों में गुणांकों पर काम करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{2}\), तो \(x^4-4x^2+4\) का मान क्या है?

If \(x=\sqrt{2}\), what is the value of \(x^4-4x^2+4\)?

Explanation opens after your attempt
Correct Answer

A. (0)

Step 1

Concept

\(x^2=2\).

Step 2

Why this answer is correct

Therefore (x-4=\(x^2\)2=4), and the value is (4-8+4=0).

Step 3

Exam Tip

For powers of a surd, first find \(x^2\). चरण 1: \(x^2=2\) है। चरण 2: इसलिए (x-4=\(x^2\)2=4), और मान (4-8+4=0) है। चरण 3: मूल वाली संख्या पर घात लगाते समय पहले \(x^2\) निकालें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{6}+\sqrt{2}\) और \(y=\sqrt{6}-\sqrt{2}\), तो \(\frac{x}{y}\) का सरल रूप क्या है?

If \(x=\sqrt{6}+\sqrt{2}\) and \(y=\sqrt{6}-\sqrt{2}\), what is the simplified form of \(\frac{x}{y}\)?

Explanation opens after your attempt
Correct Answer

A. \(2+\sqrt{3}\)

Step 1

Concept

Rationalize the denominator of \(\frac{\sqrt{6}+\sqrt{2}}{\sqrt{6}-\sqrt{2}}\).

Step 2

Why this answer is correct

The numerator becomes (\(\sqrt{6}+\sqrt{2}\)2=8+4\sqrt{3}), and the denominator is (6-2=4), so the value is \(2+\sqrt{3}\).

Step 3

Exam Tip

Multiplying by the conjugate is effective in such quotients. चरण 1: \(\frac{\sqrt{6}+\sqrt{2}}{\sqrt{6}-\sqrt{2}}\) में हर को संयुग्मी से परिमेय करें। चरण 2: ऊपर (\(\sqrt{6}+\sqrt{2}\)2=8+4\sqrt{3}) और नीचे (6-2=4), इसलिए मान \(2+\sqrt{3}\) है। चरण 3: भाग में संयुग्मी से गुणा करना प्रभावी तरीका है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प (\(\sqrt{7}+\sqrt{2}\)2-\(\sqrt{7}-\sqrt{2}\)2) के बराबर है?

Which option is equal to (\(\sqrt{7}+\sqrt{2}\)2-\(\sqrt{7}-\sqrt{2}\)2)?

Explanation opens after your attempt
Correct Answer

A. \(4\sqrt{14}\)

Step 1

Concept

((u+v)2-(u-v)2=4uv).

Step 2

Why this answer is correct

Here \(u=\sqrt{7}\) and \(v=\sqrt{2}\), so the value is \(4\sqrt{14}\).

Step 3

Exam Tip

Using the identity makes the expansion shorter. चरण 1: ((u+v)2-(u-v)2=4uv) होता है। चरण 2: यहाँ \(u=\sqrt{7}\) और \(v=\sqrt{2}\), इसलिए मान \(4\sqrt{14}\) है। चरण 3: पहचान का प्रयोग करने से विस्तार छोटा हो जाता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{80}-\sqrt{45}+\sqrt{20}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{80}-\sqrt{45}+\sqrt{20}\)?

Explanation opens after your attempt
Correct Answer

B. \(3\sqrt{5}\)

Step 1

Concept

\(\sqrt{80}=4\sqrt{5}\), \(\sqrt{45}=3\sqrt{5}\), and \(\sqrt{20}=2\sqrt{5}\).

Step 2

Why this answer is correct

\(4\sqrt{5}-3\sqrt{5}+2\sqrt{5}=3\sqrt{5}\), which is irrational.

Step 3

Exam Tip

Handle the signs carefully when three terms are involved. चरण 1: \(\sqrt{80}=4\sqrt{5}\), \(\sqrt{45}=3\sqrt{5}\), और \(\sqrt{20}=2\sqrt{5}\)। चरण 2: \(4\sqrt{5}-3\sqrt{5}+2\sqrt{5}=3\sqrt{5}\), जो अपरिमेय है। चरण 3: तीन पदों में चिह्नों को ध्यान से संभालें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{13}+2\), तो \(x^2-4x\) का मान क्या है?

If \(x=\sqrt{13}+2\), what is the value of \(x^2-4x\)?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

Write (x-2-4x=x(x-4)).

Step 2

Why this answer is correct

With \(x=\sqrt{13}+2\), \(x-4=\sqrt{13}-2\), so the product is (13-4=9).

Step 3

Exam Tip

A conjugate form may be hidden in such expressions. चरण 1: (x-2-4x=x(x-4)) लिखें। चरण 2: \(x=\sqrt{13}+2\) होने पर \(x-4=\sqrt{13}-2\), इसलिए गुणन (13-4=9) है। चरण 3: ऐसे रूप में संयुग्मी छिपा हो सकता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=2\sqrt{5}\) और \(y=5\sqrt{2}\), तो (xy) की प्रकृति क्या है?

If \(x=2\sqrt{5}\) and \(y=5\sqrt{2}\), what is the nature of (xy)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

\(xy=2\sqrt{5}\times5\sqrt{2}=10\sqrt{10}\).

Step 2

Why this answer is correct

\(\sqrt{10}\) is irrational, so \(10\sqrt{10}\) is irrational.

Step 3

Exam Tip

If the product inside the root is not a perfect square, the result may remain irrational. चरण 1: \(xy=2\sqrt{5}\times5\sqrt{2}=10\sqrt{10}\)। चरण 2: \(\sqrt{10}\) अपरिमेय है, इसलिए \(10\sqrt{10}\) अपरिमेय है। चरण 3: गुणन के बाद अंदर की संख्या पूर्ण वर्ग नहीं बने तो परिणाम अपरिमेय रह सकता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प बताता है कि \(2\sqrt{3}\) और \(3\sqrt{2}\) में कौन बड़ा है?

Which option correctly tells which is greater between \(2\sqrt{3}\) and \(3\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

B. \(3\sqrt{2}\) बड़ा है\(3\sqrt{2}\) is greater

Step 1

Concept

Both numbers are positive, so compare their squares.

Step 2

Why this answer is correct

(\(2\sqrt{3}\)2=12) and (\(3\sqrt{2}\)2=18), so \(3\sqrt{2}\) is greater.

Step 3

Exam Tip

Squaring is a safe method for comparing positive surds. चरण 1: दोनों संख्याएँ धनात्मक हैं, इसलिए वर्ग करके तुलना करें। चरण 2: (\(2\sqrt{3}\)2=12) और (\(3\sqrt{2}\)2=18), इसलिए \(3\sqrt{2}\) बड़ा है। चरण 3: धनात्मक मूलों की तुलना में वर्ग करना सुरक्षित तरीका है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{3}-1\), तो ((x+1)2) का मान क्या है?

If \(x=\sqrt{3}-1\), what is the value of ((x+1)2)?

Explanation opens after your attempt
Correct Answer

A. (3)

Step 1

Concept

\(x+1=\sqrt{3}\).

Step 2

Why this answer is correct

Therefore ((x+1)2=\(\sqrt{3}\)2=3).

Step 3

Exam Tip

Simplify the inner expression first, then square it. चरण 1: \(x+1=\sqrt{3}\) है। चरण 2: इसलिए ((x+1)2=\(\sqrt{3}\)2=3)। चरण 3: पहले भीतर के पद को सरल करें, फिर वर्ग करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{3}\) और \(\sqrt{12}\) के बीच संबंध सही बताता है?

Which option correctly states the relation between \(\sqrt{3}\) and \(\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{12}=2\sqrt{3}\)

Step 1

Concept

\(12=4\times3\).

Step 2

Why this answer is correct

\(\sqrt{12}=\sqrt{4}\sqrt{3}=2\sqrt{3}\).

Step 3

Exam Tip

Take the perfect square factor outside the radical. चरण 1: \(12=4\times3\) है। चरण 2: \(\sqrt{12}=\sqrt{4}\sqrt{3}=2\sqrt{3}\)। चरण 3: पूर्ण वर्ग गुणनखंड को मूल से बाहर निकालें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{5}+\sqrt{3}\), तो \(x-\frac{2}{x}\) का मान क्या है?

If \(x=\sqrt{5}+\sqrt{3}\), what is the value of \(x-\frac{2}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{3}\)

Step 1

Concept

\(\frac{1}{\sqrt{5}+\sqrt{3}}=\frac{\sqrt{5}-\sqrt{3}}{2}\).

Step 2

Why this answer is correct

Therefore \(\frac{2}{x}=\sqrt{5}-\sqrt{3}\).

Step 3

Exam Tip

(x-\frac{2}{x}=\(\sqrt{5}+\sqrt{3}\)-\(\sqrt{5}-\sqrt{3}\)=2\sqrt{3}). चरण 1: \(\frac{1}{\sqrt{5}+\sqrt{3}}=\frac{\sqrt{5}-\sqrt{3}}{2}\) होता है। चरण 2: इसलिए \(\frac{2}{x}=\sqrt{5}-\sqrt{3}\)। चरण 3: (x-\frac{2}{x}=\(\sqrt{5}+\sqrt{3}\)-\(\sqrt{5}-\sqrt{3}\)=2\sqrt{3})।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प बताता है कि \(\sqrt{2}+\sqrt{3}\) अपरिमेय है?

Which option explains why \(\sqrt{2}+\sqrt{3}\) is irrational?

Explanation opens after your attempt
Correct Answer

A. यदि यह परिमेय हो, तो वर्ग करने पर \(5+2\sqrt{6}\) परिमेय होगा और \(\sqrt{6}\) परिमेय निकल आएगाIf it were rational, squaring would make \(5+2\sqrt{6}\) rational and then \(\sqrt{6}\) would be rational

Step 1

Concept

Assume \(\sqrt{2}+\sqrt{3}\) is rational.

Step 2

Why this answer is correct

Squaring gives \(5+2\sqrt{6}\) rational, which would force \(\sqrt{6}\) to be rational, impossible.

Step 3

Exam Tip

Squaring is useful for sums of two different surds. चरण 1: मान लें \(\sqrt{2}+\sqrt{3}\) परिमेय है। चरण 2: वर्ग करने पर \(5+2\sqrt{6}\) परिमेय होगा, जिससे \(\sqrt{6}\) परिमेय मानना पड़ेगा, जो गलत है। चरण 3: दो अलग मूलों के योग में वर्ग विधि उपयोगी होती है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\frac{\sqrt{18}}{\sqrt{5}}\) की प्रकृति सही बताता है?

Which option correctly describes the nature of \(\frac{\sqrt{18}}{\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेय, क्योंकि \(\frac{18}{5}\) पूर्ण वर्ग नहीं हैIrrational because \(\frac{18}{5}\) is not a perfect square

Step 1

Concept

\(\frac{\sqrt{18}}{\sqrt{5}}=\sqrt{\frac{18}{5}}\).

Step 2

Why this answer is correct

\(\frac{18}{5}\) is not a perfect square of a rational number, so the result is irrational.

Step 3

Exam Tip

In quotients of radicals, check whether the fraction inside is a perfect square. चरण 1: \(\frac{\sqrt{18}}{\sqrt{5}}=\sqrt{\frac{18}{5}}\) है। चरण 2: \(\frac{18}{5}\) किसी परिमेय संख्या का पूर्ण वर्ग नहीं है, इसलिए परिणाम अपरिमेय है। चरण 3: भाग वाले मूलों में अंदर के भिन्न को पूर्ण वर्ग है या नहीं, यह देखें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{2}+\sqrt{5}\) और \(y=\sqrt{5}-\sqrt{2}\), तो (xy) का मान क्या है?

If \(x=\sqrt{2}+\sqrt{5}\) and \(y=\sqrt{5}-\sqrt{2}\), what is the value of (xy)?

Explanation opens after your attempt
Correct Answer

A. (3)

Step 1

Concept

View the product as (\(\sqrt{5}+\sqrt{2}\)\(\sqrt{5}-\sqrt{2}\)).

Step 2

Why this answer is correct

It gives (5-2=3).

Step 3

Exam Tip

You can rearrange the order of addition to recognize a conjugate form. चरण 1: गुणन को (\(\sqrt{5}+\sqrt{2}\)\(\sqrt{5}-\sqrt{2}\)) की तरह देखें। चरण 2: यह (5-2=3) देता है। चरण 3: जोड़ के क्रम को बदलकर संयुग्मी रूप पहचान सकते हैं।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(5+2\sqrt{6}\) के बराबर है?

Which option is equal to \(5+2\sqrt{6}\)?

Explanation opens after your attempt
Correct Answer

A. (\(\sqrt{3}+\sqrt{2}\)2)

Step 1

Concept

(\(\sqrt{3}+\sqrt{2}\)2=3+2+2\sqrt{6}).

Step 2

Why this answer is correct

This equals \(5+2\sqrt{6}\).

Step 3

Exam Tip

When squaring a sum of two surds, the middle term becomes \(2\sqrt{6}\). चरण 1: (\(\sqrt{3}+\sqrt{2}\)2=3+2+2\sqrt{6})। चरण 2: यह \(5+2\sqrt{6}\) के बराबर है। चरण 3: दो मूलों के योग का वर्ग करते समय बीच वाला पद \(2\sqrt{6}\) बनता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{50}+\sqrt{72}-\sqrt{98}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{50}+\sqrt{72}-\sqrt{98}\)?

Explanation opens after your attempt
Correct Answer

A. \(4\sqrt{2}\)

Step 1

Concept

\(\sqrt{50}=5\sqrt{2}\), \(\sqrt{72}=6\sqrt{2}\), and \(\sqrt{98}=7\sqrt{2}\).

Step 2

Why this answer is correct

\(5\sqrt{2}+6\sqrt{2}-7\sqrt{2}=4\sqrt{2}\).

Step 3

Exam Tip

Once all terms are like surds, add or subtract only the coefficients. चरण 1: \(\sqrt{50}=5\sqrt{2}\), \(\sqrt{72}=6\sqrt{2}\), और \(\sqrt{98}=7\sqrt{2}\)। चरण 2: \(5\sqrt{2}+6\sqrt{2}-7\sqrt{2}=4\sqrt{2}\)। चरण 3: सभी पद समान मूल में बदल जाएँ तो केवल गुणांक जोड़ें या घटाएँ।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{3}+\sqrt{2}\), तो \(\frac{1}{x}\) का परिमेय हर वाला रूप कौन-सा है?

If \(x=\sqrt{3}+\sqrt{2}\), which is the rationalized form of \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}-\sqrt{2}\)

Step 1

Concept

The conjugate of \(\sqrt{3}+\sqrt{2}\) is \(\sqrt{3}-\sqrt{2}\).

Step 2

Why this answer is correct

The denominator becomes (3-2=1), so \(\frac{1}{\sqrt{3}+\sqrt{2}}=\sqrt{3}-\sqrt{2}\).

Step 3

Exam Tip

When the difference of the squared surds is (1), the result becomes very simple. चरण 1: \(\sqrt{3}+\sqrt{2}\) का संयुग्मी \(\sqrt{3}-\sqrt{2}\) है। चरण 2: हर (3-2=1) बनता है, इसलिए \(\frac{1}{\sqrt{3}+\sqrt{2}}=\sqrt{3}-\sqrt{2}\)। चरण 3: जिन दो मूलों के वर्गों का अंतर (1) हो, वहाँ उत्तर बहुत सरल आता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\frac{1}{\sqrt{6}-\sqrt{5}}\), तो (x) किसके बराबर है?

If \(x=\frac{1}{\sqrt{6}-\sqrt{5}}\), what is (x) equal to?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{6}+\sqrt{5}\)

Step 1

Concept

The conjugate of the denominator is \(\sqrt{6}+\sqrt{5}\).

Step 2

Why this answer is correct

The denominator becomes (\(\sqrt{6}\)2-\(\sqrt{5}\)2=6-5=1).

Step 3

Exam Tip

When the denominator is a difference of two surds, multiply by its conjugate. चरण 1: हर का संयुग्मी \(\sqrt{6}+\sqrt{5}\) है। चरण 2: हर (\(\sqrt{6}\)2-\(\sqrt{5}\)2=6-5=1) बनता है। चरण 3: जब हर में दो मूलों का अंतर हो, तो संयुग्मी से गुणा करें।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प (\(\sqrt{11}+\sqrt{3}\)\(\sqrt{11}-\sqrt{3}\)) की प्रकृति सही बताता है?

Which option correctly describes the nature of (\(\sqrt{11}+\sqrt{3}\)\(\sqrt{11}-\sqrt{3}\))?

Explanation opens after your attempt
Correct Answer

A. (8), परिमेय(8), rational

Step 1

Concept

This is of the form ((u+v)(u-v)).

Step 2

Why this answer is correct

The value is (11-3=8), which is rational.

Step 3

Exam Tip

Multiplying conjugate surds often removes the irrational part. चरण 1: यह ((u+v)(u-v)) के रूप में है। चरण 2: मान (11-3=8) आता है, जो परिमेय है। चरण 3: संयुग्मी पदों का गुणन अक्सर अपरिमेय भाग हटा देता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा कथन \(\sqrt{5}+\sqrt{20}-\sqrt{45}\) के लिए सही है?

Which statement is correct for \(\sqrt{5}+\sqrt{20}-\sqrt{45}\)?

Explanation opens after your attempt
Correct Answer

A. यह (0) है और परिमेय हैIt is (0) and rational

Step 1

Concept

Write \(\sqrt{20}=2\sqrt{5}\) and \(\sqrt{45}=3\sqrt{5}\).

Step 2

Why this answer is correct

\(\sqrt{5}+2\sqrt{5}-3\sqrt{5}=0\), which is rational.

Step 3

Exam Tip

Terms that look irrational may cancel to give a rational result. चरण 1: \(\sqrt{20}=2\sqrt{5}\) और \(\sqrt{45}=3\sqrt{5}\) लिखें। चरण 2: \(\sqrt{5}+2\sqrt{5}-3\sqrt{5}=0\), जो परिमेय है। चरण 3: अपरिमेय दिखने वाले पद कटकर परिमेय उत्तर दे सकते हैं।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

यदि \(x=\sqrt{7}+\sqrt{28}\), तो \(\frac{x^2}{7}\) का मान क्या है?

If \(x=\sqrt{7}+\sqrt{28}\), what is the value of \(\frac{x^2}{7}\)?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

\(\sqrt{28}=2\sqrt{7}\), so \(x=3\sqrt{7}\).

Step 2

Why this answer is correct

(x-2=\(3\sqrt{7}\)2=63), hence \(\frac{x^2}{7}=9\).

Step 3

Exam Tip

Combine like surds before squaring. चरण 1: \(\sqrt{28}=2\sqrt{7}\), इसलिए \(x=3\sqrt{7}\)। चरण 2: (x-2=\(3\sqrt{7}\)2=63), अतः \(\frac{x^2}{7}=9\)। चरण 3: वर्ग करने से पहले समान मूल वाले पद जोड़ना सरल रहता है।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\frac{\sqrt{45}+\sqrt{20}}{\sqrt{5}}\) का सही मान देता है?

Which option gives the correct value of \(\frac{\sqrt{45}+\sqrt{20}}{\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

\(\sqrt{45}=3\sqrt{5}\) and \(\sqrt{20}=2\sqrt{5}\).

Step 2

Why this answer is correct

The numerator becomes \(5\sqrt{5}\), so \(\frac{5\sqrt{5}}{\sqrt{5}}=5\).

Step 3

Exam Tip

Before division, convert the numerator surds into like terms. चरण 1: \(\sqrt{45}=3\sqrt{5}\) और \(\sqrt{20}=2\sqrt{5}\) हैं। चरण 2: ऊपर का योग \(5\sqrt{5}\) है, इसलिए \(\frac{5\sqrt{5}}{\sqrt{5}}=5\)। चरण 3: भाग से पहले ऊपर के मूलों को समान रूप में बदलें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि (A=\(3+\sqrt{2}\)2-\(3-\sqrt{2}\)2), तो (A) का सही मान और प्रकृति क्या है?

If (A=\(3+\sqrt{2}\)2-\(3-\sqrt{2}\)2), what is the correct value and nature of (A)?

Explanation opens after your attempt
Correct Answer

A. \(12\sqrt{2}\), अपरिमेय\(12\sqrt{2}\), irrational

Step 1

Concept

Use ((a+b)2-(a-b)2=4ab).

Step 2

Why this answer is correct

Here (a=3) and \(b=\sqrt{2}\), so \(A=4\times3\times\sqrt{2}=12\sqrt{2}\), which is irrational.

Step 3

Exam Tip

In such questions, use the identity instead of expanding both squares fully. चरण 1: ((a+b)2-(a-b)2=4ab) का प्रयोग करें। चरण 2: यहाँ (a=3) और \(b=\sqrt{2}\) हैं, इसलिए \(A=4\times3\times\sqrt{2}=12\sqrt{2}\), जो अपरिमेय है। चरण 3: ऐसे प्रश्न में दोनों वर्गों को पूरा फैलाने के बजाय पहचान वाला सूत्र लगाएँ।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(a=\sqrt{2}+\sqrt{3}\) और \(b=\sqrt{3}-\sqrt{2}\), तो (ab) का मान क्या है?

If \(a=\sqrt{2}+\sqrt{3}\) and \(b=\sqrt{3}-\sqrt{2}\), what is the value of (ab)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

View (ab) as (\(\sqrt{3}+\sqrt{2}\)\(\sqrt{3}-\sqrt{2}\)).

Step 2

Why this answer is correct

This equals (\(\sqrt{3}\)2-\(\sqrt{2}\)2=3-2=1).

Step 3

Exam Tip

Since addition order does not change the sum, recognize the conjugate form. चरण 1: (ab=\(\sqrt{3}+\sqrt{2}\)\(\sqrt{3}-\sqrt{2}\)) के रूप में देखा जा सकता है। चरण 2: यह (\(\sqrt{3}\)2-\(\sqrt{2}\)2=3-2=1) है। चरण 3: क्रम बदलने से योग नहीं बदलता, इसलिए संयुग्मी रूप पहचानें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\sqrt{3}+\sqrt{12}+\sqrt{27}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{3}+\sqrt{12}+\sqrt{27}\)?

Explanation opens after your attempt
Correct Answer

A. \(6\sqrt{3}\)

Step 1

Concept

\(\sqrt{12}=2\sqrt{3}\) and \(\sqrt{27}=3\sqrt{3}\).

Step 2

Why this answer is correct

The total sum is \(\sqrt{3}+2\sqrt{3}+3\sqrt{3}=6\sqrt{3}\).

Step 3

Exam Tip

Converting all terms into like surds makes addition easy. चरण 1: \(\sqrt{12}=2\sqrt{3}\) और \(\sqrt{27}=3\sqrt{3}\)। चरण 2: कुल योग \(\sqrt{3}+2\sqrt{3}+3\sqrt{3}=6\sqrt{3}\) है। चरण 3: सभी पदों को समान मूल में बदलने से जोड़ आसान हो जाता है।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(x=\sqrt{5}-\sqrt{2}\), तो \(x^2\) कौन-सा होगा?

If \(x=\sqrt{5}-\sqrt{2}\), what is \(x^2\)?

Explanation opens after your attempt
Correct Answer

A. \(7-2\sqrt{10}\)

Step 1

Concept

Use ((a-b)2=a-2-2ab+b-2).

Step 2

Why this answer is correct

\(x^2=5-2\sqrt{10}+2=7-2\sqrt{10}\).

Step 3

Exam Tip

Do not forget the negative sign in the middle term when squaring a difference. चरण 1: ((a-b)2=a-2-2ab+b-2) का प्रयोग करें। चरण 2: \(x^2=5-2\sqrt{10}+2=7-2\sqrt{10}\)। चरण 3: अंतर के वर्ग में बीच वाले पद का ऋण चिह्न न भूलें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(x=1+\sqrt{2}\), तो \(x^2-2x\) का मान क्या है?

If \(x=1+\sqrt{2}\), what is the value of \(x^2-2x\)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

(x-2-2x=x(x-2)).

Step 2

Why this answer is correct

With \(x=1+\sqrt{2}\), \(x-2=\sqrt{2}-1\), so the product (\(1+\sqrt{2}\)\(\sqrt{2}-1\)=1).

Step 3

Exam Tip

Recognizing conjugate-like forms makes calculation shorter. चरण 1: (x-2-2x=x(x-2)) है। चरण 2: \(x=1+\sqrt{2}\) रखने पर \(x-2=\sqrt{2}-1\), इसलिए गुणन (\(1+\sqrt{2}\)\(\sqrt{2}-1\)=1) मिलता है। चरण 3: संयुग्मी जैसे रूपों को पहचानने से गणना छोटी होती है।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

निम्न में से कौन-सी संख्या (4) और (5) के बीच नहीं है?

Which of the following numbers is not between (4) and (5)?

Explanation opens after your attempt
Correct Answer

D. \(\sqrt{26}\)

Step 1

Concept

\(4=\sqrt{16}\) and \(5=\sqrt{25}\).

Step 2

Why this answer is correct

(17), (20), and (24) lie between (16) and (25), but (26) is greater than (25).

Step 3

Exam Tip

For positive square roots, comparing squares is easier. चरण 1: \(4=\sqrt{16}\) और \(5=\sqrt{25}\) हैं। चरण 2: (17), (20) और (24) (16) और (25) के बीच हैं, पर (26) (25) से बड़ा है। चरण 3: धनात्मक वर्गमूलों की तुलना में वर्गों की तुलना आसान होती है।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(a=\sqrt{2}+\sqrt{5}\), तो \(a^2\) की प्रकृति क्या होगी?

If \(a=\sqrt{2}+\sqrt{5}\), what will be the nature of \(a^2\)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

(\(\sqrt{2}+\sqrt{5}\)2=2+5+2\sqrt{10}).

Step 2

Why this answer is correct

This is \(7+2\sqrt{10}\), which has an irrational part.

Step 3

Exam Tip

When squaring a sum of two different surds, pay attention to the middle term. चरण 1: (\(\sqrt{2}+\sqrt{5}\)2=2+5+2\sqrt{10}) है। चरण 2: यह \(7+2\sqrt{10}\) है, जिसमें अपरिमेय भाग मौजूद है। चरण 3: दो अलग मूलों के योग का वर्ग करते समय बीच वाले पद पर ध्यान दें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\sqrt{75}\) और \(\sqrt{27}\) के योग को सही बताता है?

Which option correctly gives the sum of \(\sqrt{75}\) and \(\sqrt{27}\)?

Explanation opens after your attempt
Correct Answer

A. \(8\sqrt{3}\)

Step 1

Concept

\(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{27}=3\sqrt{3}\).

Step 2

Why this answer is correct

The sum is \(5\sqrt{3}+3\sqrt{3}=8\sqrt{3}\).

Step 3

Exam Tip

Do not combine separate square roots directly into one root. चरण 1: \(\sqrt{75}=5\sqrt{3}\) और \(\sqrt{27}=3\sqrt{3}\)। चरण 2: योग \(5\sqrt{3}+3\sqrt{3}=8\sqrt{3}\) है। चरण 3: अलग-अलग मूलों को सीधे जोड़कर एक मूल न बनाएं।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

किस विकल्प में दोनों संख्याएँ अपरिमेय हैं और उनका योग भी अपरिमेय है?

In which option are both numbers irrational and their sum is also irrational?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{3}\) और \(2\sqrt{3}\)\(\sqrt{3}\) and \(2\sqrt{3}\)

Step 1

Concept

\(\sqrt{3}\) and \(2\sqrt{3}\) are both irrational.

Step 2

Why this answer is correct

Their sum is \(3\sqrt{3}\), which is irrational.

Step 3

Exam Tip

In sum questions, identify whether like surds cancel or combine. चरण 1: \(\sqrt{3}\) और \(2\sqrt{3}\) दोनों अपरिमेय हैं। चरण 2: उनका योग \(3\sqrt{3}\) है, जो अपरिमेय है। चरण 3: योग वाले प्रश्नों में कटने वाले और जुड़ने वाले समान मूल अलग-अलग पहचानें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\sqrt{5}+\sqrt{45}-\sqrt{20}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{5}+\sqrt{45}-\sqrt{20}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{5}\)

Step 1

Concept

\(\sqrt{45}=3\sqrt{5}\) and \(\sqrt{20}=2\sqrt{5}\).

Step 2

Why this answer is correct

\(\sqrt{5}+3\sqrt{5}-2\sqrt{5}=2\sqrt{5}\).

Step 3

Exam Tip

In questions with many radicals, first convert all terms to like surds when possible. चरण 1: \(\sqrt{45}=3\sqrt{5}\) और \(\sqrt{20}=2\sqrt{5}\)। चरण 2: \(\sqrt{5}+3\sqrt{5}-2\sqrt{5}=2\sqrt{5}\)। चरण 3: कई मूलों वाले प्रश्न में पहले सभी पदों को समान मूल में बदलें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(a=\sqrt{13}-\sqrt{52}\), तो (a) का सरल रूप क्या है?

If \(a=\sqrt{13}-\sqrt{52}\), what is the simplified form of (a)?

Explanation opens after your attempt
Correct Answer

A. \(-\sqrt{13}\)

Step 1

Concept

\(\sqrt{52}=2\sqrt{13}\).

Step 2

Why this answer is correct

\(a=\sqrt{13}-2\sqrt{13}=-\sqrt{13}\), which is irrational.

Step 3

Exam Tip

A negative sign does not change irrationality. चरण 1: \(\sqrt{52}=2\sqrt{13}\) है। चरण 2: \(a=\sqrt{13}-2\sqrt{13}=-\sqrt{13}\), जो अपरिमेय है। चरण 3: ऋण चिह्न आने पर भी अपरिमेयता नहीं बदलती।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(y=\sqrt{8}+\sqrt{32}\), तो \(\frac{y}{\sqrt{2}}\) का मान क्या है?

If \(y=\sqrt{8}+\sqrt{32}\), what is the value of \(\frac{y}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\) and \(\sqrt{32}=4\sqrt{2}\).

Step 2

Why this answer is correct

\(y=6\sqrt{2}\), so \(\frac{y}{\sqrt{2}}=6\).

Step 3

Exam Tip

First add like surds, then divide. चरण 1: \(\sqrt{8}=2\sqrt{2}\) और \(\sqrt{32}=4\sqrt{2}\)। चरण 2: \(y=6\sqrt{2}\), इसलिए \(\frac{y}{\sqrt{2}}=6\)। चरण 3: पहले समान मूल वाले पदों को जोड़ें, फिर भाग दें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

निम्न में से कौन-सा विकल्प \(\sqrt{98}-\sqrt{50}\) का सही सरल रूप है?

Which option is the correct simplified form of \(\sqrt{98}-\sqrt{50}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{2}\)

Step 1

Concept

\(\sqrt{98}=7\sqrt{2}\) and \(\sqrt{50}=5\sqrt{2}\).

Step 2

Why this answer is correct

The difference is \(7\sqrt{2}-5\sqrt{2}=2\sqrt{2}\), which is irrational.

Step 3

Exam Tip

For like surds, subtract only the coefficients. चरण 1: \(\sqrt{98}=7\sqrt{2}\) और \(\sqrt{50}=5\sqrt{2}\)। चरण 2: अंतर \(7\sqrt{2}-5\sqrt{2}=2\sqrt{2}\), जो अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल गुणांक घटाएँ।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\frac{3}{2+\sqrt{5}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{3}{2+\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

B. (3\(\sqrt{5}-2\))

Step 1

Concept

The conjugate of the denominator is \(2-\sqrt{5}\).

Step 2

Why this answer is correct

(\frac{3}{2+\sqrt{5}}\times\frac{2-\sqrt{5}}{2-\sqrt{5}}=\frac{3\(2-\sqrt{5}\)}{4-5}=3\(\sqrt{5}-2\)).

Step 3

Exam Tip

Use the difference of squares in the denominator when multiplying by a conjugate. चरण 1: हर का संयुग्मी \(2-\sqrt{5}\) है। चरण 2: (\frac{3}{2+\sqrt{5}}\times\frac{2-\sqrt{5}}{2-\sqrt{5}}=\frac{3\(2-\sqrt{5}\)}{4-5}=3\(\sqrt{5}-2\))। चरण 3: संयुग्मी से गुणा करते समय हर में अंतर के वर्ग का प्रयोग करें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(a=5+\sqrt{7}\) और \(b=5-\sqrt{7}\), तो (ab) का मान क्या है?

If \(a=5+\sqrt{7}\) and \(b=5-\sqrt{7}\), what is the value of (ab)?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

This is multiplication of conjugates.

Step 2

Why this answer is correct

(ab=52-\(\sqrt{7}\)2=25-7=18).

Step 3

Exam Tip

In conjugate multiplication, the middle irrational terms cancel. चरण 1: यह संयुग्मी संख्याओं का गुणन है। चरण 2: (ab=52-\(\sqrt{7}\)2=25-7=18)। चरण 3: संयुग्मी गुणन में बीच के अपरिमेय पद कट जाते हैं।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

किस विकल्प में दी गई संख्या निश्चित रूप से अपरिमेय है?

In which option is the given number definitely irrational?

Explanation opens after your attempt
Correct Answer

B. \(\frac{\sqrt{45}}{3}\)

Step 1

Concept

\(\frac{\sqrt{45}}{3}=\frac{3\sqrt{5}}{3}=\sqrt{5}\).

Step 2

Why this answer is correct

Since (5) is not a perfect square, \(\sqrt{5}\) is irrational.

Step 3

Exam Tip

Do not choose an answer in multiplication or division of surds without simplifying. चरण 1: \(\frac{\sqrt{45}}{3}=\frac{3\sqrt{5}}{3}=\sqrt{5}\) है। चरण 2: (5) पूर्ण वर्ग नहीं है, इसलिए \(\sqrt{5}\) अपरिमेय है। चरण 3: भाग और गुणन वाले विकल्पों को सरल किए बिना उत्तर न चुनें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि \(x=\sqrt{3}+2\) है, तो \(x-\sqrt{3}\) का मान और प्रकृति क्या होगी?

If \(x=\sqrt{3}+2\), what will be the value and nature of \(x-\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. (2), परिमेय(2), rational

Step 1

Concept

Substitute the given value of (x).

Step 2

Why this answer is correct

(x-\sqrt{3}=\(\sqrt{3}+2\)-\sqrt{3}=2), which is rational.

Step 3

Exam Tip

Like irrational terms may cancel, so decide the nature only after simplifying. चरण 1: दिए गए (x) का मान रखें। चरण 2: (x-\sqrt{3}=\(\sqrt{3}+2\)-\sqrt{3}=2), जो परिमेय है। चरण 3: समान अपरिमेय पद कट सकते हैं, इसलिए सरल करने के बाद ही प्रकृति तय करें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\sqrt{2}+\sqrt{18}\) का सही सरल रूप और प्रकृति बताता है?

Which option gives the correct simplified form and nature of \(\sqrt{2}+\sqrt{18}\)?

Explanation opens after your attempt
Correct Answer

A. \(4\sqrt{2}\), अपरिमेय\(4\sqrt{2}\), irrational

Step 1

Concept

\(\sqrt{18}=3\sqrt{2}\).

Step 2

Why this answer is correct

\(\sqrt{2}+\sqrt{18}=\sqrt{2}+3\sqrt{2}=4\sqrt{2}\), which is irrational.

Step 3

Exam Tip

For like surds, add only the outside coefficients. चरण 1: \(\sqrt{18}=3\sqrt{2}\) होता है। चरण 2: \(\sqrt{2}+\sqrt{18}=\sqrt{2}+3\sqrt{2}=4\sqrt{2}\), जो अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल बाहर के गुणांक जोड़ें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(a=\sqrt{3}+2\) और \(b=\sqrt{3}-2\), तो (ab) की प्रकृति क्या है?

If \(a=\sqrt{3}+2\) and \(b=\sqrt{3}-2\), what is the nature of (ab)?

Explanation opens after your attempt
Correct Answer

A. परिमेय और ऋणात्मकRational and negative

Step 1

Concept

(a) and (b) are conjugates.

Step 2

Why this answer is correct

(ab=\(\sqrt{3}\)2-22=3-4=-1), which is rational and negative.

Step 3

Exam Tip

In conjugate multiplication, the middle irrational terms cancel. चरण 1: (a) और (b) संयुग्मी रूप में हैं। चरण 2: (ab=\(\sqrt{3}\)2-22=3-4=-1), जो परिमेय और ऋणात्मक है। चरण 3: संयुग्मी गुणन में बीच के अपरिमेय पद कट जाते हैं।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{11}+\sqrt{44}\), तो (x) का सरल रूप और प्रकृति क्या है?

If \(x=\sqrt{11}+\sqrt{44}\), what is the simplified form and nature of (x)?

Explanation opens after your attempt
Correct Answer

A. \(3\sqrt{11}\), अपरिमेय\(3\sqrt{11}\), irrational

Step 1

Concept

\(\sqrt{44}=\sqrt{4\times11}=2\sqrt{11}\).

Step 2

Why this answer is correct

Hence \(x=\sqrt{11}+2\sqrt{11}=3\sqrt{11}\), and \(\sqrt{11}\) is irrational.

Step 3

Exam Tip

For like surds, add only the coefficients, not the numbers inside the roots. चरण 1: \(\sqrt{44}=\sqrt{4\times11}=2\sqrt{11}\) होता है। चरण 2: इसलिए \(x=\sqrt{11}+2\sqrt{11}=3\sqrt{11}\), और \(\sqrt{11}\) अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल गुणांक जोड़ें, मूल के अंदर की संख्या नहीं।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\sqrt{32}-\sqrt{2}\) का सही सरल रूप और प्रकृति बताता है?

Which option gives the correct simplified form and nature of \(\sqrt{32}-\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(3\sqrt{2}\), अपरिमेय\(3\sqrt{2}\), irrational

Step 1

Concept

\(\sqrt{32}=4\sqrt{2}\).

Step 2

Why this answer is correct

\(\sqrt{32}-\sqrt{2}=4\sqrt{2}-\sqrt{2}=3\sqrt{2}\), which is irrational.

Step 3

Exam Tip

For like surds, subtract only the coefficients. चरण 1: \(\sqrt{32}=4\sqrt{2}\) है। चरण 2: \(\sqrt{32}-\sqrt{2}=4\sqrt{2}-\sqrt{2}=3\sqrt{2}\), जो अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल गुणांक घटाएँ।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सी संख्या \(\sqrt{27}+\sqrt{12}\) का सरल रूप है?

Which number is the simplified form of \(\sqrt{27}+\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

A. \(5\sqrt{3}\)

Step 1

Concept

\(\sqrt{27}=3\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\).

Step 2

Why this answer is correct

The sum is \(3\sqrt{3}+2\sqrt{3}=5\sqrt{3}\), which is irrational.

Step 3

Exam Tip

Do not combine separate square roots as \(\sqrt{39}\). चरण 1: \(\sqrt{27}=3\sqrt{3}\) और \(\sqrt{12}=2\sqrt{3}\)। चरण 2: योग \(3\sqrt{3}+2\sqrt{3}=5\sqrt{3}\), जो अपरिमेय है। चरण 3: अलग-अलग मूलों को सीधे जोड़कर \(\sqrt{39}\) न लिखें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

निम्न में से कौन-सा योग परिमेय है?

Which of the following sums is rational?

Explanation opens after your attempt
Correct Answer

A. (\(2+\sqrt{3}\)+\(5-\sqrt{3}\))

Step 1

Concept

First look for like irrational terms.

Step 2

Why this answer is correct

(\(2+\sqrt{3}\)+\(5-\sqrt{3}\)=7) because \(\sqrt{3}\) and \(-\sqrt{3}\) cancel.

Step 3

Exam Tip

Opposite irrational terms can produce a rational result. चरण 1: पहले समान अपरिमेय पदों को देखें। चरण 2: (\(2+\sqrt{3}\)+\(5-\sqrt{3}\)=7), क्योंकि \(\sqrt{3}\) और \(-\sqrt{3}\) कट जाते हैं। चरण 3: विपरीत अपरिमेय पदों से परिमेय उत्तर बन सकता है।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{2}+\sqrt{3}\), तो \(x^2\) के बारे में सही कथन क्या है?

If \(x=\sqrt{2}+\sqrt{3}\), which statement about \(x^2\) is correct?

Explanation opens after your attempt
Correct Answer

A. \(x^2=5+2\sqrt{6}\), अपरिमेय\(x^2=5+2\sqrt{6}\), irrational

Step 1

Concept

Use ((a+b)2=a-2+2ab+b-2).

Step 2

Why this answer is correct

\(x^2=2+2\sqrt{6}+3=5+2\sqrt{6}\), which has an irrational part.

Step 3

Exam Tip

Do not forget the middle term when squaring a sum of surds. चरण 1: ((a+b)2=a-2+2ab+b-2) का प्रयोग करें। चरण 2: \(x^2=2+2\sqrt{6}+3=5+2\sqrt{6}\), जिसमें अपरिमेय भाग है। चरण 3: दो मूलों के योग का वर्ग करते समय बीच वाला पद न भूलें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\sqrt{3}\) और \(y=2\sqrt{3}\), तो (x+y) के बारे में सही कथन क्या है?

If \(x=\sqrt{3}\) and \(y=2\sqrt{3}\), which statement about (x+y) is correct?

Explanation opens after your attempt
Correct Answer

A. यह \(3\sqrt{3}\) है और अपरिमेय हैIt is \(3\sqrt{3}\) and irrational

Step 1

Concept

Add the coefficients of like surds.

Step 2

Why this answer is correct

\(\sqrt{3}+2\sqrt{3}=3\sqrt{3}\), and \(\sqrt{3}\) is irrational.

Step 3

Exam Tip

Coefficients add; the number inside the radical remains unchanged. चरण 1: समान मूल वाले पदों के गुणांक जोड़े जाते हैं। चरण 2: \(\sqrt{3}+2\sqrt{3}=3\sqrt{3}\), और \(\sqrt{3}\) अपरिमेय है। चरण 3: गुणांक जुड़ते हैं, मूल के अंदर की संख्या नहीं बदलती।

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