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logical step MCQ Questions for Class 10

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

Practice Questions

1 questions tagged with logical step.

Question 1/1 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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