Concept-wise Practice

conjugate MCQ Questions for Class 10

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

Practice Questions

46 questions tagged with conjugate.

कौन सा विकल्प \(1+\sqrt{7}\) और \(1-\sqrt{7}\) के गुणनफल का मान है?

Which option is the value of the product of \(1+\sqrt{7}\) and \(1-\sqrt{7}\)?

Explanation opens after your attempt
Correct Answer

A. (-6)

Step 1

Concept

(\(1+\sqrt{7}\)\(1-\sqrt{7}\)=1-7=-6). In conjugate multiplication the irrational part cancels.

Step 2

Why this answer is correct

The correct answer is A. (-6). (\(1+\sqrt{7}\)\(1-\sqrt{7}\)=1-7=-6). In conjugate multiplication the irrational part cancels.

Step 3

Exam Tip

(\(1+\sqrt{7}\)\(1-\sqrt{7}\)=1-7=-6) है। संयुग्मी गुणन में अपरिमेय भाग हट जाता है।

Open Question Page
Ask Friends

कौन सा विकल्प (\(\sqrt{11}+2\)\(\sqrt{11}-2\)) का मान है?

Which option is the value of (\(\sqrt{11}+2\)\(\sqrt{11}-2\))?

Explanation opens after your attempt
Correct Answer

A. (7)

Step 1

Concept

This is ((a+b)(a-b)=a-2-b-2). The value is (11-4=7).

Step 2

Why this answer is correct

The correct answer is A. (7). This is ((a+b)(a-b)=a-2-b-2). The value is (11-4=7).

Step 3

Exam Tip

यह ((a+b)(a-b)=a-2-b-2) है। मान (11-4=7) होगा।

Open Question Page
Ask Friends

यदि \(u=6+\sqrt{5}\) और \(v=6-\sqrt{5}\) हैं तो (uv) का मान क्या है?

If \(u=6+\sqrt{5}\) and \(v=6-\sqrt{5}\), what is the value of (uv)?

Explanation opens after your attempt
Correct Answer

A. (31)

Step 1

Concept

Conjugate multiplication gives ((6)2-\(\sqrt{5}\)2=36-5=31). Use \(a^2-b^2\) in such questions.

Step 2

Why this answer is correct

The correct answer is A. (31). Conjugate multiplication gives ((6)2-\(\sqrt{5}\)2=36-5=31). Use \(a^2-b^2\) in such questions.

Step 3

Exam Tip

संयुग्मी गुणन से ((6)2-\(\sqrt{5}\)2=36-5=31) मिलता है। ऐसे प्रश्नों में \(a^2-b^2\) प्रयोग करें।

Open Question Page
Ask Friends

यदि \(a=3+\sqrt{6}\) और \(b=3-\sqrt{6}\) हैं तो (a+b) का मान क्या है?

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

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

In the sum \(\sqrt{6}\) and \(-\sqrt{6}\) cancel. So (a+b=6).

Step 2

Why this answer is correct

The correct answer is A. (6). In the sum \(\sqrt{6}\) and \(-\sqrt{6}\) cancel. So (a+b=6).

Step 3

Exam Tip

योग में \(\sqrt{6}\) और \(-\sqrt{6}\) कट जाते हैं। इसलिए (a+b=6) है।

Open Question Page
Ask Friends

कौन सा विकल्प \(1+\sqrt{3}\) और \(1-\sqrt{3}\) के गुणनफल का मान है?

Which option is the value of the product of \(1+\sqrt{3}\) and \(1-\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. (-2)

Step 1

Concept

(\(1+\sqrt{3}\)\(1-\sqrt{3}\)=1-3=-2). Multiplying conjugates gives a rational number.

Step 2

Why this answer is correct

The correct answer is A. (-2). (\(1+\sqrt{3}\)\(1-\sqrt{3}\)=1-3=-2). Multiplying conjugates gives a rational number.

Step 3

Exam Tip

(\(1+\sqrt{3}\)\(1-\sqrt{3}\)=1-3=-2) है। संयुग्मी जोड़े का गुणन परिमेय देता है।

Open Question Page
Ask Friends

यदि \(u=5+\sqrt{2}\) और \(v=5-\sqrt{2}\) हैं तो (uv) का मान क्या है?

If \(u=5+\sqrt{2}\) and \(v=5-\sqrt{2}\), what is the value of (uv)?

Explanation opens after your attempt
Correct Answer

A. (23)

Step 1

Concept

(\(5+\sqrt{2}\)\(5-\sqrt{2}\)=25-2=23). In conjugate multiplication the irrational part cancels.

Step 2

Why this answer is correct

The correct answer is A. (23). (\(5+\sqrt{2}\)\(5-\sqrt{2}\)=25-2=23). In conjugate multiplication the irrational part cancels.

Step 3

Exam Tip

(\(5+\sqrt{2}\)\(5-\sqrt{2}\)=25-2=23) है। संयुग्मी गुणन में अपरिमेय भाग हट जाता है।

Open Question Page
Ask Friends

कौन सा विकल्प \(\frac{2}{\sqrt{5}+1}\) को परिमेय हर वाले रूप में सही लिखता है?

Which option correctly writes \(\frac{2}{\sqrt{5}+1}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{5}-1}{2}\)

Step 1

Concept

Multiply by the conjugate \(\sqrt{5}-1\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

Multiplying by the conjugate makes the denominator rational. चरण 1: हर को \(\sqrt{5}-1\) से गुणा करें। चरण 2: (\frac{2\(\sqrt{5}-1\)}{5-1}=\frac{\sqrt{5}-1}{2})। चरण 3: संयुग्मी से गुणा करने पर हर परिमेय बन जाता है।

Open Question Page
Ask Friends

कौन-सा विकल्प \(\sqrt{2}+\sqrt{3}\) के व्युत्क्रम को सही बताता है?

Which option correctly gives the reciprocal of \(\sqrt{2}+\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

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

Step 2

Why this answer is correct

Therefore \(\sqrt{3}-\sqrt{2}\) is its reciprocal.

Step 3

Exam Tip

In reciprocals, keep the order and sign of the conjugate carefully. चरण 1: (\(\sqrt{2}+\sqrt{3}\)\(\sqrt{3}-\sqrt{2}\)=3-2=1)। चरण 2: इसलिए \(\sqrt{3}-\sqrt{2}\) इसका व्युत्क्रम है। चरण 3: व्युत्क्रम में संयुग्मी का क्रम और चिह्न सावधानी से रखें।

Open Question Page
Ask Friends

कौन-सी संख्या \(\frac{2}{\sqrt{2}+1}\) के बराबर है?

Which number is equal to \(\frac{2}{\sqrt{2}+1}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The conjugate of the denominator is \(\sqrt{2}-1\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

Choosing the correct conjugate sign is very important. चरण 1: हर का संयुग्मी \(\sqrt{2}-1\) है। चरण 2: (\frac{2}{\sqrt{2}+1}\times\frac{\sqrt{2}-1}{\sqrt{2}-1}=\frac{2\(\sqrt{2}-1\)}{2-1}=2\sqrt{2}-2)। चरण 3: संयुग्मी का सही चिह्न चुनना बहुत जरूरी है।

Open Question Page
Ask Friends

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

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

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The conjugate of the denominator in \(\frac{1}{2-\sqrt{3}}\) is \(2+\sqrt{3}\).

Step 2

Why this answer is correct

\(\frac{1}{2-\sqrt{3}}\times\frac{2+\sqrt{3}}{2+\sqrt{3}}=\frac{2+\sqrt{3}}{4-3}=2+\sqrt{3}\).

Step 3

Exam Tip

Multiplying by the conjugate removes the radical from the denominator. चरण 1: \(\frac{1}{2-\sqrt{3}}\) में हर का संयुग्मी \(2+\sqrt{3}\) है। चरण 2: \(\frac{1}{2-\sqrt{3}}\times\frac{2+\sqrt{3}}{2+\sqrt{3}}=\frac{2+\sqrt{3}}{4-3}=2+\sqrt{3}\)। चरण 3: हर में संयुग्मी से गुणा करने पर मूल हट जाता है।

Open Question Page
Ask Friends

यदि \(x=4-\sqrt{15}\), तो \(\frac{1}{x}\) क्या होगा?

If \(x=4-\sqrt{15}\), what is \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

In \(\frac{1}{4-\sqrt{15}}\), the conjugate of the denominator is \(4+\sqrt{15}\).

Step 2

Why this answer is correct

The denominator becomes (16-15=1), so the value is \(4+\sqrt{15}\).

Step 3

Exam Tip

Rationalising with the conjugate quickly simplifies the denominator. चरण 1: \(\frac{1}{4-\sqrt{15}}\) में हर का संयुग्म \(4+\sqrt{15}\) है। चरण 2: हर (16-15=1) बनता है, इसलिए मान \(4+\sqrt{15}\) है। चरण 3: संयुग्म से परिमेयकरण करने पर हर जल्दी सरल होता है।

Open Question Page
Ask Friends

\(\frac{1}{4+\sqrt{15}}\) का परिमेय हर वाला रूप क्या है?

What is the form of \(\frac{1}{4+\sqrt{15}}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The conjugate of \(4+\sqrt{15}\) is \(4-\sqrt{15}\).

Step 2

Why this answer is correct

\(\frac{1}{4+\sqrt{15}}\times\frac{4-\sqrt{15}}{4-\sqrt{15}}=\frac{4-\sqrt{15}}{16-15}=4-\sqrt{15}\).

Step 3

Exam Tip

Use the conjugate of the denominator for rationalisation. चरण 1: हर \(4+\sqrt{15}\) का संयुग्म \(4-\sqrt{15}\) है। चरण 2: \(\frac{1}{4+\sqrt{15}}\times\frac{4-\sqrt{15}}{4-\sqrt{15}}=\frac{4-\sqrt{15}}{16-15}=4-\sqrt{15}\)। चरण 3: परिमेयकरण में हर का संयुग्म प्रयोग करें।

Open Question Page
Ask Friends

यदि \(x=3-\sqrt{8}\), तो \(\frac{1}{x}\) क्या होगा?

If \(x=3-\sqrt{8}\), what is \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

In \(\frac{1}{3-\sqrt{8}}\), the conjugate of the denominator is \(3+\sqrt{8}\).

Step 2

Why this answer is correct

The denominator becomes (9-8=1), so the value is \(3+\sqrt{8}\).

Step 3

Exam Tip

Rationalising with the conjugate quickly simplifies the denominator. चरण 1: \(\frac{1}{3-\sqrt{8}}\) में हर का संयुग्म \(3+\sqrt{8}\) है। चरण 2: हर (9-8=1) बनता है, इसलिए मान \(3+\sqrt{8}\) है। चरण 3: संयुग्म से परिमेयकरण करने पर हर जल्दी सरल होता है।

Open Question Page
Ask Friends

\(\frac{1}{3+\sqrt{8}}\) का परिमेय हर वाला रूप क्या है?

What is the form of \(\frac{1}{3+\sqrt{8}}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The conjugate of \(3+\sqrt{8}\) is \(3-\sqrt{8}\).

Step 2

Why this answer is correct

\(\frac{1}{3+\sqrt{8}}\times\frac{3-\sqrt{8}}{3-\sqrt{8}}=\frac{3-\sqrt{8}}{9-8}=3-\sqrt{8}\).

Step 3

Exam Tip

Use the conjugate of the denominator for rationalisation. चरण 1: हर \(3+\sqrt{8}\) का संयुग्म \(3-\sqrt{8}\) है। चरण 2: \(\frac{1}{3+\sqrt{8}}\times\frac{3-\sqrt{8}}{3-\sqrt{8}}=\frac{3-\sqrt{8}}{9-8}=3-\sqrt{8}\)। चरण 3: परिमेयकरण में हर का संयुग्म प्रयोग करें।

Open Question Page
Ask Friends

यदि \(x=2-\sqrt{3}\), तो \(\frac{1}{x}\) क्या होगा?

If \(x=2-\sqrt{3}\), what is \(\frac{1}{x}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

For \(\frac{1}{2-\sqrt{3}}\), the conjugate of the denominator is \(2+\sqrt{3}\).

Step 2

Why this answer is correct

Multiplying gives denominator (4-3=1), so the value is \(2+\sqrt{3}\).

Step 3

Exam Tip

Rationalising with the conjugate gives the answer quickly. चरण 1: \(\frac{1}{2-\sqrt{3}}\) में हर का संयुग्म \(2+\sqrt{3}\) है। चरण 2: गुणा करने पर हर (4-3=1) बनता है, इसलिए मान \(2+\sqrt{3}\) है। चरण 3: संयुग्म से परिमेयकरण तेजी से उत्तर देता है।

Open Question Page
Ask Friends

\(\frac{1}{2+\sqrt{3}}\) का परिमेय हर वाला रूप क्या है?

What is the form of \(\frac{1}{2+\sqrt{3}}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

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

Step 2

Why this answer is correct

\(\frac{1}{2+\sqrt{3}}\times\frac{2-\sqrt{3}}{2-\sqrt{3}}=\frac{2-\sqrt{3}}{4-3}=2-\sqrt{3}\).

Step 3

Exam Tip

For rationalisation, multiply by the conjugate. चरण 1: हर का संयुग्म \(2-\sqrt{3}\) है। चरण 2: \(\frac{1}{2+\sqrt{3}}\times\frac{2-\sqrt{3}}{2-\sqrt{3}}=\frac{2-\sqrt{3}}{4-3}=2-\sqrt{3}\)। चरण 3: परिमेयकरण में संयुग्म से गुणा करें।

Open Question Page
Ask Friends