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Question Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 16

कौन सा कथन \(\sqrt{2}\) की अपरिमेयता के प्रमाण में गलत कदम है?

Which statement is a wrong step in the proof of irrationality of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

D. \(p^2=2q^2\) से सीधे (p=2q)From \(p^2=2q^2\), directly (p=2q)

Step 1

Concept

From \(p^2=2q^2\), we conclude \(p^2\) is even.

Step 2

Why this answer is correct

This gives (p) even, but not directly (p=2q).

Step 3

Exam Tip

The correct form is (p=2r), where (r) is an integer. चरण 1: \(p^2=2q^2\) से \(p^2\) के सम होने का निष्कर्ष निकलता है। चरण 2: इससे (p) सम है, लेकिन सीधे (p=2q) नहीं लिख सकते। चरण 3: सही रूप (p=2r) होता है, जहां (r) पूर्णांक है।

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Question Easy Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

कौन सा कथन \(\sqrt{3}\) के प्रमाण में गलत कदम है?

Which statement is a wrong step in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

D. \(p^2=3q^2\) से (p=3q)From \(p^2=3q^2\), (p=3q)

Step 1

Concept

From \(p^2=3q^2\), \(p^2\) is divisible by (3).

Step 2

Why this answer is correct

This gives (p) divisible by (3), but we cannot directly write (p=3q).

Step 3

Exam Tip

The correct way is to write (p=3k). चरण 1: \(p^2=3q^2\) से \(p^2\) (3) से विभाज्य है। चरण 2: इससे (p) (3) से विभाज्य है, लेकिन सीधे (p=3q) नहीं लिखा जा सकता। चरण 3: सही तरीका है (p=3k) लिखना।

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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{2}\) की अपरिमेयता के प्रमाण में गलत कदम है?

Which option is a wrong step in the proof of irrationality of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

D. \(p^2=2q^2\) से (q) सम है, सीधे मान लेनाDirectly assuming from \(p^2=2q^2\) that (q) is even

Step 1

Concept

From \(p^2=2q^2\), first \(p^2\) is even and hence (p) is even.

Step 2

Why this answer is correct

After writing (p=2k), we get \(q^2=2k^2\), so (q) is even.

Step 3

Exam Tip

Skipping this order makes the proof incomplete. चरण 1: \(p^2=2q^2\) से पहले \(p^2\) सम और फिर (p) सम मिलता है। चरण 2: (p=2k) रखने के बाद \(q^2=2k^2\) से (q) सम निकलता है। चरण 3: प्रमाण में क्रम छोड़ने से तर्क अधूरा हो जाता है।

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Question Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

कौन सा विकल्प \(\sqrt{2}\) के प्रमाण में सही नहीं है?

Which option is not correct in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

D. \(a^2=2b^2\) से सीधे (a=2b)From \(a^2=2b^2\), directly (a=2b)

Step 1

Concept

From \(a^2=2b^2\), \(a^2\) is even.

Step 2

Why this answer is correct

This gives (a) even, but not directly (a=2b).

Step 3

Exam Tip

The correct step is to write (a=2k). चरण 1: \(a^2=2b^2\) से \(a^2\) सम मिलता है। चरण 2: इससे (a) सम है, लेकिन सीधे (a=2b) नहीं मिलता। चरण 3: सही कदम (a=2k) लिखना है।

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Question Easy Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 16

\(\sqrt{2}\) के प्रमाण में \(p^2=2q^2\) से सीधे क्या नहीं कहना चाहिए?

In the proof of \(\sqrt{2}\), what should not be said directly from \(p^2=2q^2\)?

Explanation opens after your attempt
Correct Answer

A. (p=q)

Step 1

Concept

From \(p^2=2q^2\), we get that \(p^2\) is even.

Step 2

Why this answer is correct

Then (p) is even and can be written as (p=2k).

Step 3

Exam Tip

Saying (p=q) from this equation is a wrong step. चरण 1: \(p^2=2q^2\) से \(p^2\) सम मिलता है। चरण 2: फिर (p) सम और (p=2k) लिखा जा सकता है। चरण 3: इस समीकरण से (p=q) कहना गलत कदम है।

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