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conjugate surds MCQ Questions for Class 10

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Practice Questions

12 questions tagged with conjugate surds.

Question 1/12 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 2/12 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 3/12 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 4/12 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 5/12 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 6/12 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 7/12 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 8/12 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 9/12 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 10/12 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 11/12 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 12/12 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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