Concept-wise Practice

proof logic MCQ Questions for Class 10

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Practice Questions

4 questions tagged with proof logic.

Question 1/4 Expert Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

\(\sqrt{2}\) का प्रमाण लिखते समय यदि कोई \(\sqrt{2}=\frac{p}{q}\) मानता है पर सरलतम रूप नहीं लिखता, तो क्या समस्या होगी?

While writing the proof for \(\sqrt{2}\), if someone assumes \(\sqrt{2}=\frac{p}{q}\) but does not mention lowest form, what problem occurs?

Explanation opens after your attempt
Correct Answer

C. साझा गुणनखंड मिलना निर्णायक विरोधाभास नहीं बनेगाFinding a common factor will not become a decisive contradiction

Step 1

Concept

The contradiction depends on (p) and (q) being coprime.

Step 2

Why this answer is correct

Without stating lowest form, both being even is not a decisive contradiction.

Step 3

Exam Tip

Therefore mention lowest form at the start. चरण 1: विरोधाभास इस बात पर निर्भर करता है कि (p) और (q) सहअभाज्य हैं। चरण 2: सरलतम रूप न लिखने पर दोनों सम मिलना जरूरी विरोधाभास नहीं कहलाएगा। चरण 3: इसलिए शुरू में सरलतम रूप अवश्य लिखें।

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Question 2/4 Expert Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 17

\(\sqrt{3}\) की अपरिमेयता सिद्ध करते समय \(\sqrt{3}=\frac{a}{b}\) में (a) और (b) को सहअभाज्य न लेने से प्रमाण में क्या कमी आ जाएगी?

While proving the irrationality of \(\sqrt{3}\), what weakness occurs if (a) and (b) in \(\sqrt{3}=\frac{a}{b}\) are not taken coprime?

Explanation opens after your attempt
Correct Answer

A. साझा गुणनखंड मिलना विरोधाभास नहीं बनेगाGetting a common factor will not become a contradiction

Step 1

Concept

The contradiction depends on (a) and (b) being coprime in lowest form.

Step 2

Why this answer is correct

Without this condition, finding (3) common to both will not be a real contradiction.

Step 3

Exam Tip

Therefore lowest form must be stated at the beginning. चरण 1: विरोधाभास इसी बात पर आधारित है कि (a) और (b) सरलतम रूप में सहअभाज्य हैं। चरण 2: यदि यह शर्त न हो, तो दोनों में (3) साझा मिलना नई बात नहीं रहेगी। चरण 3: इसलिए प्रमाण की शुरुआत में सरलतम रूप लिखना आवश्यक है।

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Question 3/4 Expert Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 16

कौन-सा कथन \(\sqrt{2}\) के प्रमाण को सबसे अधिक कमजोर बना देगा?

Which statement would weaken the proof of \(\sqrt{2}\) the most?

Explanation opens after your attempt
Correct Answer

A. \(\frac{p}{q}\) को सरलतम रूप में न लेनाNot taking \(\frac{p}{q}\) in lowest form

Step 1

Concept

The contradiction depends on (p) and (q) being coprime.

Step 2

Why this answer is correct

If lowest form is not taken, getting a common factor will not be a contradiction.

Step 3

Exam Tip

Therefore lowest form is essential at the start. चरण 1: विरोधाभास इसी बात पर निर्भर करता है कि (p) और (q) सहअभाज्य हैं। चरण 2: यदि सरलतम रूप नहीं लिया गया, तो साझा गुणनखंड मिलना विरोधाभास नहीं बनेगा। चरण 3: इसलिए शुरुआत में सरलतम रूप जरूरी है।

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Question 4/4 Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 17

यदि (p) और (q) सहअभाज्य हैं, तो कौन सी बात असंभव है?

If (p) and (q) are coprime, which situation is impossible?

Explanation opens after your attempt
Correct Answer

A. दोनों में (1) के अलावा कोई साझा गुणनखंड होनाHaving a common factor other than (1)

Step 1

Concept

Coprime numbers are defined as having only (1) as common factor.

Step 2

Why this answer is correct

Finding any common factor other than (1) is impossible.

Step 3

Exam Tip

Irrationality proofs show exactly this impossible situation. चरण 1: सहअभाज्य संख्याओं की परिभाषा है कि उनका साझा गुणनखंड केवल (1) हो। चरण 2: (1) के अलावा कोई साझा गुणनखंड मिलना असंभव है। चरण 3: अपरिमेयता की सिद्धि इसी असंभव स्थिति को दिखाती है।

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