Concept-wise Practice

rationalisation MCQ Questions for Class 10

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

Practice Questions

36 questions tagged with rationalisation.

\(\dfrac{3}{2-\sqrt{3}}\) का हर परिमेय करने पर कौन सा रूप मिलेगा?

Which form is obtained by rationalising the denominator of \(\dfrac{3}{2-\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiplying by \(2+\sqrt{3}\) makes the denominator (4-3=1). In exams, multiply both numerator and denominator by the conjugate.

Step 2

Why this answer is correct

The correct answer is A. \(,6+3\sqrt{3},\). Multiplying by \(2+\sqrt{3}\) makes the denominator (4-3=1). In exams, multiply both numerator and denominator by the conjugate.

Step 3

Exam Tip

हर को \(2+\sqrt{3}\) से गुणा करने पर हर (4-3=1) हो जाता है। परीक्षा में conjugate से numerator और denominator दोनों को गुणा करें।

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\(\dfrac{2}{\sqrt{7}+\sqrt{5}}\) का हर परिमेय करने पर कौन सा रूप मिलेगा?

Which form is obtained by rationalising the denominator of \(\dfrac{2}{\sqrt{7}+\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

A. \(,\sqrt{7}-\sqrt{5},\)

Step 1

Concept

Multiplying by \(\sqrt{7}-\sqrt{5}\) makes the denominator (7-5=2) and gives \(\sqrt{7}-\sqrt{5}\). In exams, use the conjugate.

Step 2

Why this answer is correct

The correct answer is A. \(,\sqrt{7}-\sqrt{5},\). Multiplying by \(\sqrt{7}-\sqrt{5}\) makes the denominator (7-5=2) and gives \(\sqrt{7}-\sqrt{5}\). In exams, use the conjugate.

Step 3

Exam Tip

हर को \(\sqrt{7}-\sqrt{5}\) से गुणा करने पर हर (7-5=2) होता है और उत्तर \(\sqrt{7}-\sqrt{5}\) मिलता है। परीक्षा में conjugate का प्रयोग करें।

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\(\dfrac{1}{\sqrt{3}-\sqrt{2}}\) का हर परिमेय करने पर कौन सा रूप मिलेगा?

Which form is obtained by rationalising the denominator of \(\dfrac{1}{\sqrt{3}-\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiplying by \(\sqrt{3}+\sqrt{2}\) makes the denominator (3-2=1). In exams, remember to multiply by the conjugate.

Step 2

Why this answer is correct

The correct answer is A. \(,\sqrt{3}+\sqrt{2},\). Multiplying by \(\sqrt{3}+\sqrt{2}\) makes the denominator (3-2=1). In exams, remember to multiply by the conjugate.

Step 3

Exam Tip

हर को \(\sqrt{3}+\sqrt{2}\) से गुणा करने पर हर (3-2=1) हो जाता है। परीक्षा में conjugate से गुणा करना न भूलें।

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यदि \(x^2+ax+b=0\) की जड़ें \(\frac{1}{4+\sqrt{3}}\) और \(\frac{1}{4-\sqrt{3}}\) हैं, तो (a) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(\frac{1}{4+\sqrt{3}}\) and \(\frac{1}{4-\sqrt{3}}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. -\(\frac{8}{13}\)

Step 1

Concept

The sum of roots is \(\frac{1}{4+\sqrt{3}}+\frac{1}{4-\sqrt{3}}=\frac{8}{13}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{8}{13}\).

Step 2

Why this answer is correct

The correct answer is A. -\(\frac{8}{13}\). The sum of roots is \(\frac{1}{4+\sqrt{3}}+\frac{1}{4-\sqrt{3}}=\frac{8}{13}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{8}{13}\).

Step 3

Exam Tip

जड़ों का योग \(\frac{1}{4+\sqrt{3}}+\frac{1}{4-\sqrt{3}}=\frac{8}{13}\) है। \(x^2+ax+b=0\) में योग (-a) होता है, इसलिए \(a=-\frac{8}{13}\)।

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यदि \(x^2+ax+b=0\) की जड़ें \(\frac{1}{3+\sqrt{5}}\) और \(\frac{1}{3-\sqrt{5}}\) हैं, तो (a) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(\frac{1}{3+\sqrt{5}}\) and \(\frac{1}{3-\sqrt{5}}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

After rationalising, the sum of roots is \(\frac{3}{2}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{3}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(-\frac{3}{2}\). After rationalising, the sum of roots is \(\frac{3}{2}\). In \(x^2+ax+b=0\), the sum is (-a), so \(a=-\frac{3}{2}\).

Step 3

Exam Tip

रैशनलाइज करने पर जड़ों का योग \(\frac{3}{2}\) मिलता है। \(x^2+ax+b=0\) में जड़ों का योग (-a) होता है, इसलिए \(a=-\frac{3}{2}\)।

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यदि \(x^2+ax+b=0\) की जड़ें \(\frac{1}{2+\sqrt{3}}\) और \(\frac{1}{2-\sqrt{3}}\) हैं, तो (a) का मान क्या है?

If the roots of \(x^2+ax+b=0\) are \(\frac{1}{2+\sqrt{3}}\) and \(\frac{1}{2-\sqrt{3}}\), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. (-4)

Step 1

Concept

The given roots become \(2-\sqrt{3}\) and \(2+\sqrt{3}\). Their sum is (4), so (a=-4).

Step 2

Why this answer is correct

The correct answer is A. (-4). The given roots become \(2-\sqrt{3}\) and \(2+\sqrt{3}\). Their sum is (4), so (a=-4).

Step 3

Exam Tip

दी गई जड़ें \(2-\sqrt{3}\) और \(2+\sqrt{3}\) बनती हैं। उनका योग (4) है, इसलिए (a=-4)।

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यदि \(x=\frac{2}{\sqrt{3}+1}\), तो (x) किसके बराबर है?

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

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}-1\)

Step 1

Concept

(\frac{2}{\sqrt{3}+1}\times\frac{\sqrt{3}-1}{\sqrt{3}-1}=\frac{2\(\sqrt{3}-1\)}{2}=\sqrt{3}-1). The conjugate makes the denominator rational.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{3}-1\). (\frac{2}{\sqrt{3}+1}\times\frac{\sqrt{3}-1}{\sqrt{3}-1}=\frac{2\(\sqrt{3}-1\)}{2}=\sqrt{3}-1). The conjugate makes the denominator rational.

Step 3

Exam Tip

(\frac{2}{\sqrt{3}+1}\times\frac{\sqrt{3}-1}{\sqrt{3}-1}=\frac{2\(\sqrt{3}-1\)}{2}=\sqrt{3}-1) है। परीक्षा में संयुग्मी से हर परिमेय बनता है।

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यदि \(x=\frac{1}{\sqrt{5}-2}\), तो (x) का सरल रूप क्या है?

If \(x=\frac{1}{\sqrt{5}-2}\), what is the simplified form of (x)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

\(\frac{1}{\sqrt{5}-2}\times\frac{\sqrt{5}+2}{\sqrt{5}+2}=\frac{\sqrt{5}+2}{5-4}=\sqrt{5}+2\). Rationalise the denominator in exams.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{5}+2\). \(\frac{1}{\sqrt{5}-2}\times\frac{\sqrt{5}+2}{\sqrt{5}+2}=\frac{\sqrt{5}+2}{5-4}=\sqrt{5}+2\). Rationalise the denominator in exams.

Step 3

Exam Tip

\(\frac{1}{\sqrt{5}-2}\times\frac{\sqrt{5}+2}{\sqrt{5}+2}=\frac{\sqrt{5}+2}{5-4}=\sqrt{5}+2\) है। परीक्षा में हर का परिमेयकरण करें।

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

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

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

\(\frac{1}{1+\sqrt{2}}=\sqrt{2}-1\), so the sum is \(2\sqrt{2}\). Rationalising the denominator is a quick exam method.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{2}\). \(\frac{1}{1+\sqrt{2}}=\sqrt{2}-1\), so the sum is \(2\sqrt{2}\). Rationalising the denominator is a quick exam method.

Step 3

Exam Tip

\(\frac{1}{1+\sqrt{2}}=\sqrt{2}-1\), इसलिए योग \(2\sqrt{2}\) है। परीक्षा में हर का परिमेयकरण तेज तरीका है।

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कौन सा विकल्प वास्तव में परिमेय संख्या है?

Which option is actually a rational number?

Explanation opens after your attempt
Correct Answer

C. \(\sqrt{8}\times\sqrt{18}\)

Step 1

Concept

Since \(\sqrt{8}\times\sqrt{18}=\sqrt{144}=12\), it is rational. In exams simplify products of radicals first.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{8}\times\sqrt{18}\). Since \(\sqrt{8}\times\sqrt{18}=\sqrt{144}=12\), it is rational. In exams simplify products of radicals first.

Step 3

Exam Tip

\(\sqrt{8}\times\sqrt{18}=\sqrt{144}=12\), इसलिए यह परिमेय है। परीक्षा में गुणन में वर्गमूलों को पहले एक साथ सरल करें।

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यदि (p(x)=\sqrt{2}x-2-4x+\sqrt{2}), तो शून्यकों का योग क्या है?

If (p(x)=\sqrt{2}x-2-4x+\sqrt{2}), what is the sum of its zeroes?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The sum is \(-\frac{b}{a}=\frac{4}{\sqrt{2}}=2\sqrt{2}\). Rationalising the denominator simplifies the answer.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{2}\). The sum is \(-\frac{b}{a}=\frac{4}{\sqrt{2}}=2\sqrt{2}\). Rationalising the denominator simplifies the answer.

Step 3

Exam Tip

योग \(-\frac{b}{a}=\frac{4}{\sqrt{2}}=2\sqrt{2}\) है। हर का परिमेयकरण करने से उत्तर सरल होता है।

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कौन सा विकल्प \(\frac{1}{5-\sqrt{6}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{1}{5-\sqrt{6}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{5+\sqrt{6}}{19}\)

Step 1

Concept

The conjugate of the denominator is \(5+\sqrt{6}\), and the denominator becomes (25-6=19). Hence the first option is correct.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{5+\sqrt{6}}{19}\). The conjugate of the denominator is \(5+\sqrt{6}\), and the denominator becomes (25-6=19). Hence the first option is correct.

Step 3

Exam Tip

हर का संयुग्मी \(5+\sqrt{6}\) है और हर (25-6=19) बनता है। इसलिए पहला विकल्प सही है।

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यदि \(a=\sqrt{5}+\sqrt{3}\) और \(b=\sqrt{5}-\sqrt{3}\) हैं तो \(\frac{a}{b}\) का सरल रूप क्या है?

If \(a=\sqrt{5}+\sqrt{3}\) and \(b=\sqrt{5}-\sqrt{3}\), what is the simplified form of \(\frac{a}{b}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiplying by the conjugate gives denominator (5-3=2) and numerator \(8+2\sqrt{15}\). The simplified form is \(4+\sqrt{15}\).

Step 2

Why this answer is correct

The correct answer is A. \(4+\sqrt{15}\). Multiplying by the conjugate gives denominator (5-3=2) and numerator \(8+2\sqrt{15}\). The simplified form is \(4+\sqrt{15}\).

Step 3

Exam Tip

संयुग्मी से गुणा करने पर हर (5-3=2) और अंश \(8+2\sqrt{15}\) बनता है। सरल रूप \(4+\sqrt{15}\) है।

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कौन सा विकल्प (\left\(\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}\right\)) का सरल रूप है?

Which option is the simplified form of (\left\(\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}\right\))?

Explanation opens after your attempt
Correct Answer

A. \(5+2\sqrt{6}\)

Step 1

Concept

Multiplying by the conjugate makes the denominator (1). The numerator is (\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}).

Step 2

Why this answer is correct

The correct answer is A. \(5+2\sqrt{6}\). Multiplying by the conjugate makes the denominator (1). The numerator is (\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}).

Step 3

Exam Tip

हर के संयुग्मी से गुणा करने पर हर (1) बनता है। अंश (\(\sqrt{3}+\sqrt{2}\)2=5+2\sqrt{6}) है।

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यदि \(m=\frac{1}{\sqrt{5}+\sqrt{2}}\) है तो (m) का सरल रूप क्या है?

If \(m=\frac{1}{\sqrt{5}+\sqrt{2}}\), what is the simplified form of (m)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiplying by the conjugate makes the denominator (5-2=3). So the rationalized form is \(\frac{\sqrt{5}-\sqrt{2}}{3}\).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{\sqrt{5}-\sqrt{2}}{3}\). Multiplying by the conjugate makes the denominator (5-2=3). So the rationalized form is \(\frac{\sqrt{5}-\sqrt{2}}{3}\).

Step 3

Exam Tip

संयुग्मी से गुणा करने पर हर (5-2=3) हो जाता है। इसलिए परिमेय हर वाला रूप \(\frac{\sqrt{5}-\sqrt{2}}{3}\) है।

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कौन सा विकल्प \(\frac{2}{\sqrt{7}-\sqrt{3}}\) का सरल रूप है?

Which option is the simplified form of \(\frac{2}{\sqrt{7}-\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{\sqrt{7}+\sqrt{3}}{2}\)

Step 1

Concept

Multiplying by the conjugate makes the denominator (7-3=4). Hence we get (\frac{2\(\sqrt{7}+\sqrt{3}\)}{4}).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{\sqrt{7}+\sqrt{3}}{2}\). Multiplying by the conjugate makes the denominator (7-3=4). Hence we get (\frac{2\(\sqrt{7}+\sqrt{3}\)}{4}).

Step 3

Exam Tip

संयुग्मी से गुणा करने पर हर (7-3=4) बनता है। इसलिए (\frac{2\(\sqrt{7}+\sqrt{3}\)}{4}) मिलता है।

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कौन सा विकल्प \(\frac{1}{3+\sqrt{5}}\) का परिमेय हर वाला रूप है?

Which option is the rationalized form of \(\frac{1}{3+\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{3-\sqrt{5}}{4}\)

Step 1

Concept

The conjugate of the denominator is \(3-\sqrt{5}\) and the denominator becomes (9-5=4). Multiply by the conjugate to rationalize.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{3-\sqrt{5}}{4}\). The conjugate of the denominator is \(3-\sqrt{5}\) and the denominator becomes (9-5=4). Multiply by the conjugate to rationalize.

Step 3

Exam Tip

हर का संयुग्मी \(3-\sqrt{5}\) है और हर (9-5=4) बनता है। परिमेयकरण में संयुग्मी से गुणा करें।

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कौन सा विकल्प \(\frac{4}{\sqrt{2}}\) का सरल रूप है?

Which option is the simplified form of \(\frac{4}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

\(\frac{4}{\sqrt{2}}=\frac{4\sqrt{2}}{2}=2\sqrt{2}\). Rationalise when a root is in the denominator.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{2}\). \(\frac{4}{\sqrt{2}}=\frac{4\sqrt{2}}{2}=2\sqrt{2}\). Rationalise when a root is in the denominator.

Step 3

Exam Tip

\(\frac{4}{\sqrt{2}}=\frac{4\sqrt{2}}{2}=2\sqrt{2}\) है। हर में जड़ हो तो परिमेयकरण करें।

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कौन सा विकल्प \(\frac{3}{\sqrt{3}}\) का सरल रूप है?

Which option is the simplified form of \(\frac{3}{\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}\)

Step 1

Concept

\(\frac{3}{\sqrt{3}}=\sqrt{3}\) because \(3=\sqrt{3}\times\sqrt{3}\). Simplify when a root is in the denominator.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{3}\). \(\frac{3}{\sqrt{3}}=\sqrt{3}\) because \(3=\sqrt{3}\times\sqrt{3}\). Simplify when a root is in the denominator.

Step 3

Exam Tip

\(\frac{3}{\sqrt{3}}=\sqrt{3}\) क्योंकि \(3=\sqrt{3}\times\sqrt{3}\)। हर में जड़ हो तो सरल करें।

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कौन सा विकल्प \(\frac{2}{\sqrt{2}}\) का सरल रूप है?

Which option is the simplified form of \(\frac{2}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\)

Step 1

Concept

\(\frac{2}{\sqrt{2}}=\sqrt{2}\). Simplify roots in the denominator to identify the nature.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\). \(\frac{2}{\sqrt{2}}=\sqrt{2}\). Simplify roots in the denominator to identify the nature.

Step 3

Exam Tip

\(\frac{2}{\sqrt{2}}=\sqrt{2}\) है। हर में जड़ हो तो सरल करके प्रकृति पहचानें।

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कौन सा विकल्प \(\frac{1}{\sqrt{2}}\) की प्रकृति सही बताता है?

Which option correctly describes the nature of \(\frac{1}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

A. यह अपरिमेय संख्या हैIt is an irrational number

Step 1

Concept

\(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\), which is irrational. When a root is in the denominator simplify first.

Step 2

Why this answer is correct

The correct answer is A. यह अपरिमेय संख्या है / It is an irrational number. \(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\), which is irrational. When a root is in the denominator simplify first.

Step 3

Exam Tip

\(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\) है जो अपरिमेय है। हर में जड़ हो तो पहले सरल करें।

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निम्नलिखित में से कौन-सा \(3+\sqrt{5}\) के बराबर है?

Which of the following is equal to \(3+\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{4}{3-\sqrt{5}}\)

Step 1

Concept

Rationalise \(\frac{4}{3-\sqrt{5}}\) by multiplying by \(3+\sqrt{5}\).

Step 2

Why this answer is correct

The denominator becomes (9-5=4), so the value is \(3+\sqrt{5}\).

Step 3

Exam Tip

Use rationalisation to identify equivalent forms. चरण 1: \(\frac{4}{3-\sqrt{5}}\) को परिमेय करने के लिए \(3+\sqrt{5}\) से गुणा करें। चरण 2: हर (9-5=4) बनता है, इसलिए मान \(3+\sqrt{5}\) है। चरण 3: बराबर रूप पहचानने के लिए परिमेयकरण करें।

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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।

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\(\frac{6}{\sqrt{3}}\) का परिमेय हर वाला सरल रूप क्या है?

What is the simplified form of \(\frac{6}{\sqrt{3}}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiply numerator and denominator by \(\sqrt{3}\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

After rationalising, simplify the answer completely. चरण 1: ऊपर और नीचे \(\sqrt{3}\) से गुणा करें। चरण 2: \(\frac{6}{\sqrt{3}}=\frac{6\sqrt{3}}{3}=2\sqrt{3}\)। चरण 3: परिमेयकरण के बाद उत्तर को पूरी तरह सरल करें।

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\(\frac{1}{4+\sqrt{15}}\) 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।

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निम्नलिखित में से कौन-सा \(2+\sqrt{3}\) के बराबर है?

Which of the following is equal to \(2+\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Rationalise \(\frac{1}{2-\sqrt{3}}\) by multiplying by \(2+\sqrt{3}\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

Use rationalisation to identify equivalent forms. चरण 1: \(\frac{1}{2-\sqrt{3}}\) का हर परिमेय करने के लिए \(2+\sqrt{3}\) से गुणा करें। चरण 2: हर (4-3=1) बनता है, इसलिए मान \(2+\sqrt{3}\) है। चरण 3: बराबर रूप पहचानने के लिए परिमेयकरण करें।

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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।

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\(\frac{4}{\sqrt{2}}\) का परिमेय हर वाला सरल रूप क्या है?

What is the simplified form of \(\frac{4}{\sqrt{2}}\) with a rational denominator?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiply numerator and denominator by \(\sqrt{2}\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

After rationalising, simplify the answer completely. चरण 1: ऊपर और नीचे \(\sqrt{2}\) से गुणा करें। चरण 2: \(\frac{4}{\sqrt{2}}=\frac{4\sqrt{2}}{2}=2\sqrt{2}\)। चरण 3: परिमेयकरण के बाद उत्तर को पूरी तरह सरल करें।

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\(\frac{1}{3+\sqrt{8}}\) 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।

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\(\frac{7}{\sqrt{7}}\) का सरल रूप क्या है?

What is the simplified form of \(\frac{7}{\sqrt{7}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{7}\)

Step 1

Concept

Multiply numerator and denominator by \(\sqrt{7}\) to remove the root from the denominator.

Step 2

Why this answer is correct

\(\frac{7}{\sqrt{7}}=\frac{7\sqrt{7}}{7}=\sqrt{7}\).

Step 3

Exam Tip

Rationalisation helps when the denominator contains a square root. चरण 1: हर से वर्गमूल हटाने के लिए ऊपर और नीचे \(\sqrt{7}\) से गुणा करें। चरण 2: \(\frac{7}{\sqrt{7}}=\frac{7\sqrt{7}}{7}=\sqrt{7}\)। चरण 3: हर में वर्गमूल हो तो परिमेयकरण मदद करता है।

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