Concept-wise Practice

conjugates MCQ Questions for Class 10

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

Practice Questions

74 questions tagged with conjugates.

यदि (p(x)=x-2-12x+31), तो शून्यकों के बीच का अंतर क्या है?

If (p(x)=x-2-12x+31), what is the difference between its zeroes?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The zeroes are \(6\pm\sqrt{5}\), so the difference is \(2\sqrt{5}\). The difference of conjugate zeroes is (2) times the radical part.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{5}\). The zeroes are \(6\pm\sqrt{5}\), so the difference is \(2\sqrt{5}\). The difference of conjugate zeroes is (2) times the radical part.

Step 3

Exam Tip

शून्यक \(6\pm\sqrt{5}\) हैं, इसलिए अंतर \(2\sqrt{5}\) है। संयुग्मी शून्यकों का अंतर (2) गुणा मूल पद होता है।

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यदि (p(x)=x-2-2mx+\(m^2-3\)) है, तो इसके शून्यक किस रूप में होंगे?

If (p(x)=x-2-2mx+\(m^2-3\)), in what form will its zeroes be?

Explanation opens after your attempt
Correct Answer

A. \(m\pm\sqrt{3}\)

Step 1

Concept

The sum is (2m) and product is \(m^2-3\), matching \(m+\sqrt{3}\) and \(m-\sqrt{3}\). Even in general form, match sum and product.

Step 2

Why this answer is correct

The correct answer is A. \(m\pm\sqrt{3}\). The sum is (2m) and product is \(m^2-3\), matching \(m+\sqrt{3}\) and \(m-\sqrt{3}\). Even in general form, match sum and product.

Step 3

Exam Tip

योग (2m) और गुणनफल \(m^2-3\) है, जो \(m+\sqrt{3}\) और \(m-\sqrt{3}\) से मिलता है। सामान्य रूप में भी योग और गुणनफल मिलाएँ।

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यदि \(\alpha=3+\sqrt{11}\) और \(\beta=3-\sqrt{11}\), तो \(\alpha^2+\beta^2\) क्या है?

If \(\alpha=3+\sqrt{11}\) and \(\beta=3-\sqrt{11}\), what is \(\alpha^2+\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. (40)

Step 1

Concept

\(\alpha+\beta=6\) and \(\alpha\beta=9-11=-2\), so (\alpha-2+\beta-2=36-2(-2)=40). The identity (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) is useful.

Step 2

Why this answer is correct

The correct answer is A. (40). \(\alpha+\beta=6\) and \(\alpha\beta=9-11=-2\), so (\alpha-2+\beta-2=36-2(-2)=40). The identity (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) is useful.

Step 3

Exam Tip

\(\alpha+\beta=6\) और \(\alpha\beta=9-11=-2\), इसलिए (\alpha-2+\beta-2=36-2(-2)=40)। पहचान (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) उपयोगी है।

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किस स्थिति में \(x^2+px+q\) के शून्यक \(4+\sqrt{7}\) और \(4-\sqrt{7}\) होंगे?

In which case will \(x^2+px+q\) have zeroes \(4+\sqrt{7}\) and \(4-\sqrt{7}\)?

Explanation opens after your attempt
Correct Answer

A. (p=-8, q=9)

Step 1

Concept

The sum is (8), so (p=-8), and the product is (16-7=9). In a monic polynomial, (p=-) sum.

Step 2

Why this answer is correct

The correct answer is A. (p=-8, q=9). The sum is (8), so (p=-8), and the product is (16-7=9). In a monic polynomial, (p=-) sum.

Step 3

Exam Tip

योग (8) है, इसलिए (p=-8), और गुणनफल (16-7=9) है। एकक बहुपद में (p=-) योग होता है।

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यदि \(a+\sqrt{b}\) और \(a-\sqrt{b}\) किसी एकक द्विघात बहुपद के शून्यक हैं, तो स्थिर पद क्या होगा?

If \(a+\sqrt{b}\) and \(a-\sqrt{b}\) are zeroes of a monic quadratic polynomial, what is the constant term?

Explanation opens after your attempt
Correct Answer

A. \(a^2-b\)

Step 1

Concept

In a monic polynomial, the constant term is the product of zeroes. Here the product is (\(a+\sqrt{b}\)\(a-\sqrt{b}\)=a-2-b).

Step 2

Why this answer is correct

The correct answer is A. \(a^2-b\). In a monic polynomial, the constant term is the product of zeroes. Here the product is (\(a+\sqrt{b}\)\(a-\sqrt{b}\)=a-2-b).

Step 3

Exam Tip

एकक बहुपद में स्थिर पद शून्यकों का गुणनफल होता है। यहाँ गुणनफल (\(a+\sqrt{b}\)\(a-\sqrt{b}\)=a-2-b) है।

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यदि \(\alpha=5+\sqrt{6}\) और \(\beta=5-\sqrt{6}\), तो \(\frac{1}{\alpha}+\frac{1}{\beta}\) क्या है?

If \(\alpha=5+\sqrt{6}\) and \(\beta=5-\sqrt{6}\), what is \(\frac{1}{\alpha}+\frac{1}{\beta}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{10}{19}\)

Step 1

Concept

\(\frac{1}{\alpha}+\frac{1}{\beta}=\frac{\alpha+\beta}{\alpha\beta}\). Here the sum is (10) and product is (25-6=19), so the answer is \(\frac{10}{19}\).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{10}{19}\). \(\frac{1}{\alpha}+\frac{1}{\beta}=\frac{\alpha+\beta}{\alpha\beta}\). Here the sum is (10) and product is (25-6=19), so the answer is \(\frac{10}{19}\).

Step 3

Exam Tip

\(\frac{1}{\alpha}+\frac{1}{\beta}=\frac{\alpha+\beta}{\alpha\beta}\) होता है। यहाँ योग (10) और गुणनफल (25-6=19), इसलिए उत्तर \(\frac{10}{19}\) है।

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यदि \(\alpha=2+\sqrt{7}\) और \(\beta=2-\sqrt{7}\), तो \(\alpha^2+\beta^2\) क्या है?

If \(\alpha=2+\sqrt{7}\) and \(\beta=2-\sqrt{7}\), what is \(\alpha^2+\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. (22)

Step 1

Concept

\(\alpha+\beta=4\) and \(\alpha\beta=4-7=-3\). Thus (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22).

Step 2

Why this answer is correct

The correct answer is A. (22). \(\alpha+\beta=4\) and \(\alpha\beta=4-7=-3\). Thus (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22).

Step 3

Exam Tip

\(\alpha+\beta=4\) और \(\alpha\beta=4-7=-3\)। इसलिए (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta=16+6=22)।

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कौन सी संख्या परिमेय है, जबकि उसमें अपरिमेय वर्गमूल दिखाई दे रहे हैं?

Which number is rational even though irrational square roots appear in it?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The first option is a product of conjugate terms.

Step 2

Why this answer is correct

(\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\)=6-2=4), which is rational.

Step 3

Exam Tip

Identifying conjugates helps remove radicals quickly. चरण 1: पहला विकल्प संयुग्मी पदों का गुणनफल है। चरण 2: (\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\)=6-2=4), जो परिमेय है। चरण 3: संयुग्मी पद पहचानने से वर्गमूल जल्दी हट जाते हैं।

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कौन सा विकल्प (\(\sqrt{3}+1\)\(\sqrt{3}-1\)) का सही मान और प्रकार देता है?

Which option gives the correct value and type of (\(\sqrt{3}+1\)\(\sqrt{3}-1\))?

Explanation opens after your attempt
Correct Answer

A. (2) और परिमेय(2) and rational

Step 1

Concept

This is a difference of squares form.

Step 2

Why this answer is correct

(\(\sqrt{3}+1\)\(\sqrt{3}-1\)=3-1=2) which is rational.

Step 3

Exam Tip

Product of conjugates often removes the radical. चरण 1: यह अंतर के वर्ग का रूप है। चरण 2: (\(\sqrt{3}+1\)\(\sqrt{3}-1\)=3-1=2) जो परिमेय है। चरण 3: संयुग्मी पदों का गुणनफल अक्सर वर्गमूल हटा देता है।

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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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निम्न में से कौन-सा मान \(1+\sqrt{2}\) और \(1-\sqrt{2}\) के गुणनफल के बराबर है?

Which value equals the product of \(1+\sqrt{2}\) and \(1-\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

C. (-1)

Step 1

Concept

This is a product of conjugates.

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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(\left\(4+\sqrt{7}\right\)\left\(4-\sqrt{7}\right\)) का मान क्या है?

What is the value of (\left\(4+\sqrt{7}\right\)\left\(4-\sqrt{7}\right\))?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

This is of the form ((a+b)(a-b)=a-2-b-2).

Step 2

Why this answer is correct

(42-\(\sqrt{7}\)2=16-7=9).

Step 3

Exam Tip

In conjugate multiplication, directly use the difference of squares. चरण 1: यह ((a+b)(a-b)=a-2-b-2) का रूप है। चरण 2: (42-\(\sqrt{7}\)2=16-7=9)। चरण 3: संयुग्म गुणन में वर्गों का अंतर सीधे लगाएं।

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(\left\(3+\sqrt{5}\right\)\left\(3-\sqrt{5}\right\)) का मान क्या है?

What is the value of (\left\(3+\sqrt{5}\right\)\left\(3-\sqrt{5}\right\))?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

This is of the form ((a+b)(a-b)=a-2-b-2).

Step 2

Why this answer is correct

(32-\(\sqrt{5}\)2=9-5=4).

Step 3

Exam Tip

In conjugate multiplication, directly use difference of squares. चरण 1: यह ((a+b)(a-b)=a-2-b-2) का रूप है। चरण 2: (32-\(\sqrt{5}\)2=9-5=4)। चरण 3: संयुग्म गुणन में वर्गों का अंतर सीधे लगाएं।

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(\left\(2+\sqrt{3}\right\)\left\(2-\sqrt{3}\right\)) का मान क्या है?

What is the value of (\left\(2+\sqrt{3}\right\)\left\(2-\sqrt{3}\right\))?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

This is of the form ((a+b)(a-b)=a-2-b-2).

Step 2

Why this answer is correct

(22-\(\sqrt{3}\)2=4-3=1).

Step 3

Exam Tip

For conjugate products, difference of squares gives the answer quickly. चरण 1: यह ((a+b)(a-b)=a-2-b-2) का रूप है। चरण 2: (22-\(\sqrt{3}\)2=4-3=1)। चरण 3: संयुग्म रूप वाले गुणन में वर्गों का अंतर जल्दी उत्तर देता है।

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