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method of contradiction MCQ Questions for Class 10

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Practice Questions

3 questions tagged with method of contradiction.

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

\(\sqrt{2}\), \(\sqrt{3}\) और \(\sqrt{5}\) की अपरिमेयता में कौन सी विधि समान है?

Which method is common in proving the irrationality of \(\sqrt{2}\), \(\sqrt{3}\), and \(\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

B. विरोधाभास विधिMethod of contradiction

Step 1

Concept

In all three proofs, the number is first assumed rational.

Step 2

Why this answer is correct

Then a contradiction is shown using the coprime condition.

Step 3

Exam Tip

Therefore it is called the method of contradiction. चरण 1: तीनों प्रमाणों में पहले संख्या को परिमेय मानते हैं। चरण 2: फिर सहअभाज्य शर्त से विरोधाभास दिखाते हैं। चरण 3: इसलिए इसे विरोधाभास विधि कहा जाता है।

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

कौन सा कथन विरोधाभास विधि को सही ढंग से समझाता है?

Which statement correctly explains the method of contradiction?

Explanation opens after your attempt
Correct Answer

A. जिस बात को सिद्ध करना है, उसके विपरीत को मानकर असंभव परिणाम दिखाते हैंWe assume the opposite of what is to be proved and show an impossible result

Step 1

Concept

In contradiction, we take the opposite assumption.

Step 2

Why this answer is correct

If it leads to an impossible result, the original statement is proved true.

Step 3

Exam Tip

This method is very useful in irrationality proofs. चरण 1: विरोधाभास विधि में उलटी मान्यता ली जाती है। चरण 2: यदि उससे असंभव बात मिलती है, तो मूल कथन सही सिद्ध होता है। चरण 3: अपरिमेयता के प्रमाणों में यह विधि बहुत उपयोगी है।

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

\(\sqrt{2}\), \(\sqrt{3}\) और \(\sqrt{5}\) के प्रमाणों में कौन सी विधि सामान्य है?

Which method is common in the proofs of \(\sqrt{2}\), \(\sqrt{3}\), and \(\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. विरोधाभास विधिMethod of contradiction

Step 1

Concept

In all three proofs, the number is first assumed rational.

Step 2

Why this answer is correct

Then a contradiction appears through a common factor.

Step 3

Exam Tip

This type of proof is called the method of contradiction. चरण 1: तीनों प्रमाणों में पहले संख्या को परिमेय मानते हैं। चरण 2: फिर साझा गुणनखंड मिलने से विरोधाभास आता है। चरण 3: इस प्रकार की सिद्धि को विरोधाभास विधि कहते हैं।

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