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logical conclusion MCQ Questions for Class 10

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Practice Questions

2 questions tagged with logical conclusion.

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

यदि \(\sqrt{2}\) परिमेय मानी जाए और अंत में (p,q) दोनों सम निकलें, तो कौन-सा निष्कर्ष तार्किक है?

If \(\sqrt{2}\) is assumed rational and finally both (p,q) turn out even, which conclusion is logical?

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Correct Answer

B. मान्यता गलत हैThe assumption is false

Step 1

Concept

(p,q) were assumed coprime in lowest form.

Step 2

Why this answer is correct

Both being even makes (2) a common factor.

Step 3

Exam Tip

Therefore the rational assumption is proved false. चरण 1: (p,q) को सरलतम रूप में सहअभाज्य माना गया था। चरण 2: दोनों सम होने पर (2) साझा गुणनखंड बनता है। चरण 3: इसलिए परिमेय मान्यता गलत सिद्ध होती है।

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

\(\sqrt{5}\) की सिद्धि में यदि (p) और (q) दोनों (5) से विभाज्य सिद्ध हो जाएं, तो कौन सा निष्कर्ष सबसे अधिक तार्किक है?

In the proof of \(\sqrt{5}\), if both (p) and (q) are proved divisible by (5), which conclusion is the most logical?

Explanation opens after your attempt
Correct Answer

A. \(\frac{p}{q}\) सरलतम रूप में नहीं था, इसलिए परिमेय मान्यता असंभव है\(\frac{p}{q}\) was not in lowest form, so the rational assumption is impossible

Step 1

Concept

If both are divisible by (5), numerator and denominator have common factor (5).

Step 2

Why this answer is correct

Such a situation cannot occur in lowest form.

Step 3

Exam Tip

Therefore the rational assumption is impossible and \(\sqrt{5}\) is irrational. चरण 1: दोनों (5) से विभाज्य हैं, इसलिए अंश और हर में (5) साझा गुणनखंड है। चरण 2: सरलतम रूप में ऐसी स्थिति नहीं हो सकती। चरण 3: इसलिए परिमेय मान्यता असंभव है और \(\sqrt{5}\) अपरिमेय है।

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