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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

15 questions tagged with rationalisation.

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

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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Question 2/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

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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Question 3/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

\(\frac{6}{\sqrt{3}}\) 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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Question 4/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

\(\frac{1}{4+\sqrt{15}}\) 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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Question 5/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

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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Question 6/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

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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Question 7/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

\(\frac{4}{\sqrt{2}}\) 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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Question 8/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

\(\frac{1}{3+\sqrt{8}}\) 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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Question 9/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

\(\frac{7}{\sqrt{7}}\) 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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Question 10/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

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।

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Question 11/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

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

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

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Multiply numerator and denominator by \(\sqrt{3}\) to remove the square root from the denominator.

Step 2

Why this answer is correct

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

Step 3

Exam Tip

After rationalising, the denominator should not contain a square root. चरण 1: हर से वर्गमूल हटाने के लिए ऊपर और नीचे \(\sqrt{3}\) से गुणा करें। चरण 2: \(\frac{2}{\sqrt{3}}=\frac{2\sqrt{3}}{3}\)। चरण 3: परिमेयकरण के बाद हर में वर्गमूल नहीं रहना चाहिए।

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Question 12/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

\(\frac{1}{2+\sqrt{3}}\) 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।

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Question 13/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

(\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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Question 14/15 Medium Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

\(\frac{5}{\sqrt{5}}\) का सरल रूप क्या है?

What is the simplified form of \(\frac{5}{\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{5}\)

Step 1

Concept

To simplify the denominator, multiply top and bottom by \(\sqrt{5}\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

Rationalising is useful when a square root appears in the denominator. चरण 1: हर को सरल करने के लिए ऊपर और नीचे \(\sqrt{5}\) से गुणा करें। चरण 2: \(\frac{5}{\sqrt{5}}=\frac{5\sqrt{5}}{5}=\sqrt{5}\)। चरण 3: हर में वर्गमूल हो तो परिमेयकरण उपयोगी होता है।

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Question 15/15 Easy Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

\(\frac{1}{\sqrt{2}}\) किस प्रकार की संख्या है?

What type of number is \(\frac{1}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेय संख्याIrrational number

Step 1

Concept

\(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

\(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\), which is irrational.

Step 3

Exam Tip

When a square root is in the denominator, rationalising helps identify the number. चरण 1: \(\sqrt{2}\) अपरिमेय है। चरण 2: \(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\), जो अपरिमेय है। चरण 3: हर में वर्गमूल हो तो परिमेयकरण करके पहचानना आसान होता है।

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