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Class 9 Mathematics Easy Quiz

Level 20 • 50/50 questions • 40 seconds per question.

Level readiness 50/50 Questions
Time Left 33:20 40 sec/question
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Question 1 / 50 0 score
Answered 0/50 Correct 0 Time 33:20

\(\sqrt{2}\) को अपरिमेय सिद्ध करने के लिए विरोधाभास विधि में पहली मान्यता क्या होती है?

In contradiction method to prove \(\sqrt{2}\) irrational what is the first assumption?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\) परिमेय है\(\sqrt{2}\) is rational

Step 1

Concept

First we assume the opposite that \(\sqrt{2}\) is rational. Then a contradiction is obtained.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\) परिमेय है / \(\sqrt{2}\) is rational. First we assume the opposite that \(\sqrt{2}\) is rational. Then a contradiction is obtained.

Step 3

Exam Tip

पहले उल्टा मानते हैं कि \(\sqrt{2}\) परिमेय है। फिर इसी से विरोधाभास मिलता है।

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\(\sqrt{3}\) को अपरिमेय सिद्ध करते समय शुरुआत में कौन-सी बात मानी जाती है?

While proving \(\sqrt{3}\) irrational which statement is assumed at the start?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{3}\) परिमेय है\(\sqrt{3}\) is rational

Step 1

Concept

In contradiction method \(\sqrt{3}\) is first assumed rational. Later this assumption is shown false.

Step 2

Why this answer is correct

The correct answer is B. \(\sqrt{3}\) परिमेय है / \(\sqrt{3}\) is rational. In contradiction method \(\sqrt{3}\) is first assumed rational. Later this assumption is shown false.

Step 3

Exam Tip

विरोधाभास विधि में पहले \(\sqrt{3}\) को परिमेय मानते हैं। बाद में यह मान्यता गलत सिद्ध होती है।

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यदि \(\sqrt{2}=\frac{a}{b}\) माना जाए तो (a) और (b) को कैसा चुना जाता है?

If \(\sqrt{2}=\frac{a}{b}\) is assumed how are (a) and (b) chosen?

Explanation opens after your attempt
Correct Answer

C. सहभाज्य और \(b\neq0\)Coprime and \(b\neq0\)

Step 1

Concept

A rational number is written in lowest form. So (a) and (b) are coprime and \(b\neq0\).

Step 2

Why this answer is correct

The correct answer is C. सहभाज्य और \(b\neq0\) / Coprime and \(b\neq0\). A rational number is written in lowest form. So (a) and (b) are coprime and \(b\neq0\).

Step 3

Exam Tip

परिमेय संख्या को सरलतम रूप में लिखा जाता है। इसलिए (a) और (b) सहभाज्य तथा \(b\neq0\) होते हैं।

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यदि \(\sqrt{3}=\frac{m}{n}\) हो तो \(n\neq0\) क्यों जरूरी है?

If \(\sqrt{3}=\frac{m}{n}\) then why is \(n\neq0\) necessary?

Explanation opens after your attempt
Correct Answer

D. क्योंकि शून्य से भाग परिभाषित नहीं हैBecause division by zero is not defined

Step 1

Concept

The denominator of a fraction cannot be zero. Therefore \(n\neq0\) is necessary.

Step 2

Why this answer is correct

The correct answer is D. क्योंकि शून्य से भाग परिभाषित नहीं है / Because division by zero is not defined. The denominator of a fraction cannot be zero. Therefore \(n\neq0\) is necessary.

Step 3

Exam Tip

भिन्न का हर शून्य नहीं हो सकता। इसलिए \(n\neq0\) जरूरी है।

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\(\sqrt{2}=\frac{a}{b}\) को वर्ग करने पर कौन-सा संबंध मिलता है?

Which relation is obtained by squaring \(\sqrt{2}=\frac{a}{b}\)?

Explanation opens after your attempt
Correct Answer

A. \(a^2=2b^2\)

Step 1

Concept

Squaring gives \(2=\frac{a^2}{b^2}\). Hence \(a^2=2b^2\).

Step 2

Why this answer is correct

The correct answer is A. \(a^2=2b^2\). Squaring gives \(2=\frac{a^2}{b^2}\). Hence \(a^2=2b^2\).

Step 3

Exam Tip

वर्ग करने पर \(2=\frac{a^2}{b^2}\) मिलता है। इसलिए \(a^2=2b^2\) बनता है।

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\(\sqrt{3}=\frac{p}{q}\) को वर्ग करने पर सही संबंध कौन-सा है?

Which is the correct relation after squaring \(\sqrt{3}=\frac{p}{q}\)?

Explanation opens after your attempt
Correct Answer

B. \(p^2=3q^2\)

Step 1

Concept

Squaring gives \(3=\frac{p^2}{q^2}\). This gives \(p^2=3q^2\).

Step 2

Why this answer is correct

The correct answer is B. \(p^2=3q^2\). Squaring gives \(3=\frac{p^2}{q^2}\). This gives \(p^2=3q^2\).

Step 3

Exam Tip

वर्ग करने पर \(3=\frac{p^2}{q^2}\) होता है। इससे \(p^2=3q^2\) मिलता है।

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संबंध \(a^2=2b^2\) से \(a^2\) के बारे में क्या पता चलता है?

What is known about \(a^2\) from \(a^2=2b^2\)?

Explanation opens after your attempt
Correct Answer

C. \(a^2\) सम है\(a^2\) is even

Step 1

Concept

The right side has factor (2). Therefore \(a^2\) is even.

Step 2

Why this answer is correct

The correct answer is C. \(a^2\) सम है / \(a^2\) is even. The right side has factor (2). Therefore \(a^2\) is even.

Step 3

Exam Tip

दाएँ पक्ष में (2) का गुणनखंड है। इसलिए \(a^2\) सम है।

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संबंध \(p^2=3q^2\) से \(p^2\) के बारे में क्या पता चलता है?

What is known about \(p^2\) from \(p^2=3q^2\)?

Explanation opens after your attempt
Correct Answer

D. \(p^2\) (3) से विभाज्य है\(p^2\) is divisible by (3)

Step 1

Concept

The right side has factor (3). Therefore \(p^2\) is divisible by (3).

Step 2

Why this answer is correct

The correct answer is D. \(p^2\) (3) से विभाज्य है / \(p^2\) is divisible by (3). The right side has factor (3). Therefore \(p^2\) is divisible by (3).

Step 3

Exam Tip

दाएँ पक्ष में (3) का गुणनखंड है। इसलिए \(p^2\) (3) से विभाज्य है।

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यदि \(a^2\) सम है तो (a) के बारे में सही निष्कर्ष क्या है?

If \(a^2\) is even what is the correct conclusion about (a)?

Explanation opens after your attempt
Correct Answer

A. (a) सम है(a) is even

Step 1

Concept

If the square of an integer is even then the integer is also even. This is the key fact in the proof of \(\sqrt{2}\).

Step 2

Why this answer is correct

The correct answer is A. (a) सम है / (a) is even. If the square of an integer is even then the integer is also even. This is the key fact in the proof of \(\sqrt{2}\).

Step 3

Exam Tip

किसी पूर्णांक का वर्ग सम हो तो वह पूर्णांक भी सम होता है। यह \(\sqrt{2}\) के प्रमाण का मुख्य तथ्य है।

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यदि \(p^2\) (3) से विभाज्य है तो (p) के बारे में सही निष्कर्ष क्या है?

If \(p^2\) is divisible by (3) what is the correct conclusion about (p)?

Explanation opens after your attempt
Correct Answer

B. (p) (3) से विभाज्य है(p) is divisible by (3)

Step 1

Concept

If prime factor (3) divides the square then it also divides the number. This is used in the proof of \(\sqrt{3}\).

Step 2

Why this answer is correct

The correct answer is B. (p) (3) से विभाज्य है / (p) is divisible by (3). If prime factor (3) divides the square then it also divides the number. This is used in the proof of \(\sqrt{3}\).

Step 3

Exam Tip

अभाज्य गुणनखंड (3) यदि वर्ग को विभाजित करे तो मूल संख्या को भी विभाजित करता है। यही \(\sqrt{3}\) के प्रमाण में लगता है।

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\(\sqrt{2}\) के प्रमाण में (a) सम होने पर उसे किस रूप में लिखते हैं?

In the proof of \(\sqrt{2}\) if (a) is even then how is it written?

Explanation opens after your attempt
Correct Answer

C. (a=2k)

Step 1

Concept

An even number is written as a multiple of (2). So (a=2k) is taken.

Step 2

Why this answer is correct

The correct answer is C. (a=2k). An even number is written as a multiple of (2). So (a=2k) is taken.

Step 3

Exam Tip

सम संख्या (2) के गुणज के रूप में लिखी जाती है। इसलिए (a=2k) रखा जाता है।

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\(\sqrt{3}\) के प्रमाण में (p) (3) से विभाज्य हो तो उसे किस रूप में लिखते हैं?

In the proof of \(\sqrt{3}\) if (p) is divisible by (3) then how is it written?

Explanation opens after your attempt
Correct Answer

D. (p=3r)

Step 1

Concept

A number divisible by (3) is written as a multiple of (3). So (p=3r) is written.

Step 2

Why this answer is correct

The correct answer is D. (p=3r). A number divisible by (3) is written as a multiple of (3). So (p=3r) is written.

Step 3

Exam Tip

(3) से विभाज्य संख्या (3) के गुणज के रूप में लिखी जाती है। इसलिए (p=3r) लिखा जाता है।

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यदि (a=2k) और \(a^2=2b^2\) है तो आगे कौन-सा संबंध मिलता है?

If (a=2k) and \(a^2=2b^2\) then which relation follows?

Explanation opens after your attempt
Correct Answer

A. \(b^2=2k^2\)

Step 1

Concept

Putting (a=2k) gives \(4k^2=2b^2\). Simplifying gives \(b^2=2k^2\).

Step 2

Why this answer is correct

The correct answer is A. \(b^2=2k^2\). Putting (a=2k) gives \(4k^2=2b^2\). Simplifying gives \(b^2=2k^2\).

Step 3

Exam Tip

(a=2k) रखने पर \(4k^2=2b^2\) मिलता है। सरल करने पर \(b^2=2k^2\) बनता है।

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यदि (p=3r) और \(p^2=3q^2\) है तो आगे कौन-सा संबंध बनता है?

If (p=3r) and \(p^2=3q^2\) then which relation is formed next?

Explanation opens after your attempt
Correct Answer

B. \(q^2=3r^2\)

Step 1

Concept

Putting (p=3r) gives \(9r^2=3q^2\). Therefore \(q^2=3r^2\).

Step 2

Why this answer is correct

The correct answer is B. \(q^2=3r^2\). Putting (p=3r) gives \(9r^2=3q^2\). Therefore \(q^2=3r^2\).

Step 3

Exam Tip

(p=3r) रखने पर \(9r^2=3q^2\) मिलता है। इसलिए \(q^2=3r^2\) होता है।

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\(b^2=2k^2\) से (b) के बारे में क्या निष्कर्ष मिलता है?

From \(b^2=2k^2\) what conclusion is obtained about (b)?

Explanation opens after your attempt
Correct Answer

C. (b) सम है(b) is even

Step 1

Concept

Since \(b^2\) is even (b) is also even. Thus both (a) and (b) become even.

Step 2

Why this answer is correct

The correct answer is C. (b) सम है / (b) is even. Since \(b^2\) is even (b) is also even. Thus both (a) and (b) become even.

Step 3

Exam Tip

\(b^2\) सम है इसलिए (b) भी सम होगा। इससे (a) और (b) दोनों सम मिलते हैं।

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\(q^2=3r^2\) से (q) के बारे में क्या निष्कर्ष मिलता है?

From \(q^2=3r^2\) what conclusion is obtained about (q)?

Explanation opens after your attempt
Correct Answer

D. (q) (3) से विभाज्य है(q) is divisible by (3)

Step 1

Concept

Since \(q^2\) is divisible by (3), (q) is also divisible by (3). This creates the contradiction.

Step 2

Why this answer is correct

The correct answer is D. (q) (3) से विभाज्य है / (q) is divisible by (3). Since \(q^2\) is divisible by (3), (q) is also divisible by (3). This creates the contradiction.

Step 3

Exam Tip

\(q^2\) (3) से विभाज्य है इसलिए (q) भी (3) से विभाज्य होगा। यही विरोधाभास बनाता है।

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\(\sqrt{2}\) के प्रमाण में (a) और (b) दोनों सम हों तो वे सहभाज्य क्यों नहीं रह सकते?

In the proof of \(\sqrt{2}\), why can (a) and (b) not be coprime if both are even?

Explanation opens after your attempt
Correct Answer

A. क्योंकि दोनों का सामान्य गुणनखंड (2) हैBecause both have common factor (2)

Step 1

Concept

If both are even, (2) divides both. Therefore they cannot be coprime.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि दोनों का सामान्य गुणनखंड (2) है / Because both have common factor (2). If both are even, (2) divides both. Therefore they cannot be coprime.

Step 3

Exam Tip

दोनों सम होने पर (2) दोनों को विभाजित करता है। इसलिए वे सहभाज्य नहीं रह सकते।

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\(\sqrt{3}\) के प्रमाण में (p) और (q) दोनों (3) से विभाज्य हों तो क्या टूटता है?

In the proof of \(\sqrt{3}\), if both (p) and (q) are divisible by (3), what fails?

Explanation opens after your attempt
Correct Answer

B. (p) और (q) का सहभाज्य होना(p) and (q) being coprime

Step 1

Concept

A common factor (3) appears in both. So the coprime condition fails.

Step 2

Why this answer is correct

The correct answer is B. (p) और (q) का सहभाज्य होना / (p) and (q) being coprime. A common factor (3) appears in both. So the coprime condition fails.

Step 3

Exam Tip

दोनों में सामान्य गुणनखंड (3) आ जाता है। इसलिए सहभाज्य होने की शर्त टूटती है।

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विरोधाभास विधि में प्रारंभिक मान्यता गलत क्यों मानी जाती है?

Why is the initial assumption considered false in contradiction method?

Explanation opens after your attempt
Correct Answer

A. क्योंकि उससे असंभव स्थिति मिलती हैBecause it leads to an impossible situation

Step 1

Concept

When an assumption leads to contradiction, that assumption is false. This proves irrationality.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि उससे असंभव स्थिति मिलती है / Because it leads to an impossible situation. When an assumption leads to contradiction, that assumption is false. This proves irrationality.

Step 3

Exam Tip

जब मान्यता से विरोधाभास मिलता है तो वह मान्यता गलत होती है। इसी से अपरिमेयता सिद्ध होती है।

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कौन-सा कथन \(\sqrt{2}\) की अपरिमेयता सिद्ध करने में सही है?

Which statement is correct in proving irrationality of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. यदि \(a^2\) सम है तो (a) सम हैIf \(a^2\) is even then (a) is even

Step 1

Concept

This is a necessary fact in the proof. It shows (a) and later (b) are both even.

Step 2

Why this answer is correct

The correct answer is A. यदि \(a^2\) सम है तो (a) सम है / If \(a^2\) is even then (a) is even. This is a necessary fact in the proof. It shows (a) and later (b) are both even.

Step 3

Exam Tip

यह प्रमाण का जरूरी तथ्य है। इससे (a) और बाद में (b) दोनों सम सिद्ध होते हैं।

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कौन-सा कथन \(\sqrt{3}\) की अपरिमेयता सिद्ध करने में सही है?

Which statement is correct in proving irrationality of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. यदि \(p^2\) (3) से विभाज्य है तो (p) (3) से विभाज्य हैIf \(p^2\) is divisible by (3) then (p) is divisible by (3)

Step 1

Concept

If prime (3) divides the square, it divides the number too. This is the main step in the proof.

Step 2

Why this answer is correct

The correct answer is B. यदि \(p^2\) (3) से विभाज्य है तो (p) (3) से विभाज्य है / If \(p^2\) is divisible by (3) then (p) is divisible by (3). If prime (3) divides the square, it divides the number too. This is the main step in the proof.

Step 3

Exam Tip

अभाज्य (3) वर्ग को विभाजित करे तो वह संख्या को भी विभाजित करता है। यही प्रमाण में मुख्य कदम है।

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\(\sqrt{2}\) की अपरिमेयता सिद्ध होने पर कौन-सा निष्कर्ष सही है?

When irrationality of \(\sqrt{2}\) is proved, which conclusion is correct?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\) परिमेय नहीं है\(\sqrt{2}\) is not rational

Step 1

Concept

The contradiction proves the rational assumption false. So \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\) परिमेय नहीं है / \(\sqrt{2}\) is not rational. The contradiction proves the rational assumption false. So \(\sqrt{2}\) is irrational.

Step 3

Exam Tip

विरोधाभास से परिमेय मान्यता गलत सिद्ध होती है। इसलिए \(\sqrt{2}\) अपरिमेय है।

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\(\sqrt{3}\) की अपरिमेयता सिद्ध होने पर कौन-सा निष्कर्ष सही है?

When irrationality of \(\sqrt{3}\) is proved, which conclusion is correct?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{3}\) परिमेय नहीं है\(\sqrt{3}\) is not rational

Step 1

Concept

The rational assumption leads to contradiction. Therefore \(\sqrt{3}\) is irrational.

Step 2

Why this answer is correct

The correct answer is B. \(\sqrt{3}\) परिमेय नहीं है / \(\sqrt{3}\) is not rational. The rational assumption leads to contradiction. Therefore \(\sqrt{3}\) is irrational.

Step 3

Exam Tip

परिमेय मान्यता से विरोधाभास मिलता है। इसलिए \(\sqrt{3}\) अपरिमेय है।

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\(\sqrt{2}\) के प्रमाण में \(a^2=2b^2\) से पहले कौन-सा चरण आता है?

Which step comes before \(a^2=2b^2\) in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}=\frac{a}{b}\) माननाAssuming \(\sqrt{2}=\frac{a}{b}\)

Step 1

Concept

First \(\sqrt{2}\) is assumed in lowest rational form. Then squaring gives \(a^2=2b^2\).

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}=\frac{a}{b}\) मानना / Assuming \(\sqrt{2}=\frac{a}{b}\). First \(\sqrt{2}\) is assumed in lowest rational form. Then squaring gives \(a^2=2b^2\).

Step 3

Exam Tip

पहले \(\sqrt{2}\) को सरलतम परिमेय रूप में मानते हैं। फिर वर्ग करने पर \(a^2=2b^2\) मिलता है।

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\(\sqrt{3}\) के प्रमाण में \(p^2=3q^2\) से पहले कौन-सा चरण आता है?

Which step comes before \(p^2=3q^2\) in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{3}=\frac{p}{q}\) माननाAssuming \(\sqrt{3}=\frac{p}{q}\)

Step 1

Concept

First \(\sqrt{3}\) is assumed rational and written as \(\frac{p}{q}\). Then squaring gives \(p^2=3q^2\).

Step 2

Why this answer is correct

The correct answer is B. \(\sqrt{3}=\frac{p}{q}\) मानना / Assuming \(\sqrt{3}=\frac{p}{q}\). First \(\sqrt{3}\) is assumed rational and written as \(\frac{p}{q}\). Then squaring gives \(p^2=3q^2\).

Step 3

Exam Tip

पहले \(\sqrt{3}\) को परिमेय मानकर \(\frac{p}{q}\) रूप में लिखा जाता है। फिर वर्ग करने पर \(p^2=3q^2\) बनता है।

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\(\sqrt{2}\) के प्रमाण में (a) और (b) के सहभाज्य होने का मतलब क्या है?

In the proof of \(\sqrt{2}\), what does it mean that (a) and (b) are coprime?

Explanation opens after your attempt
Correct Answer

A. दोनों का सामान्य गुणनखंड केवल (1) हैTheir only common factor is (1)

Step 1

Concept

Coprime means no common factor except (1). This later creates the contradiction.

Step 2

Why this answer is correct

The correct answer is A. दोनों का सामान्य गुणनखंड केवल (1) है / Their only common factor is (1). Coprime means no common factor except (1). This later creates the contradiction.

Step 3

Exam Tip

सहभाज्य का अर्थ है कोई सामान्य गुणनखंड (1) के अलावा न हो। यही बाद में विरोधाभास बनाता है।

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\(\sqrt{3}\) के प्रमाण में (p) और (q) के सहभाज्य होने का मतलब क्या है?

In the proof of \(\sqrt{3}\), what does it mean that (p) and (q) are coprime?

Explanation opens after your attempt
Correct Answer

B. दोनों का सामान्य गुणनखंड केवल (1) हैTheir only common factor is (1)

Step 1

Concept

Coprime numbers have no common factor except (1). Both becoming divisible by (3) clashes with this.

Step 2

Why this answer is correct

The correct answer is B. दोनों का सामान्य गुणनखंड केवल (1) है / Their only common factor is (1). Coprime numbers have no common factor except (1). Both becoming divisible by (3) clashes with this.

Step 3

Exam Tip

सहभाज्य संख्याओं में (1) के अलावा कोई सामान्य गुणनखंड नहीं होता। दोनों का (3) से विभाज्य निकलना इसी से टकराता है।

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किस विकल्प में \(\sqrt{2}\) के प्रमाण का सही छोटा क्रम है?

Which option gives the correct short order of the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. परिमेय मानना फिर वर्ग करना फिर दोनों सम का विरोधाभासAssume rational then square then contradiction of both even

Step 1

Concept

In the proof of \(\sqrt{2}\), it is first assumed rational. Then squaring gives the contradiction of both even.

Step 2

Why this answer is correct

The correct answer is A. परिमेय मानना फिर वर्ग करना फिर दोनों सम का विरोधाभास / Assume rational then square then contradiction of both even. In the proof of \(\sqrt{2}\), it is first assumed rational. Then squaring gives the contradiction of both even.

Step 3

Exam Tip

\(\sqrt{2}\) के प्रमाण में पहले परिमेय मानते हैं। फिर वर्ग करके दोनों सम का विरोधाभास मिलता है।

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किस विकल्प में \(\sqrt{3}\) के प्रमाण का सही छोटा क्रम है?

Which option gives the correct short order of the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. परिमेय मानना फिर वर्ग करना फिर दोनों (3) से विभाज्य का विरोधाभासAssume rational then square then contradiction of both divisible by (3)

Step 1

Concept

In the proof of \(\sqrt{3}\), it is first assumed rational. Then a divisibility by (3) contradiction is obtained.

Step 2

Why this answer is correct

The correct answer is B. परिमेय मानना फिर वर्ग करना फिर दोनों (3) से विभाज्य का विरोधाभास / Assume rational then square then contradiction of both divisible by (3). In the proof of \(\sqrt{3}\), it is first assumed rational. Then a divisibility by (3) contradiction is obtained.

Step 3

Exam Tip

\(\sqrt{3}\) के प्रमाण में पहले परिमेय मानते हैं। फिर (3) से विभाज्यता का विरोधाभास मिलता है।

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\(\sqrt{2}\) के प्रमाण में (b) भी सम निकलने से कौन-सा सामान्य गुणनखंड बनता है?

In the proof of \(\sqrt{2}\), if (b) is also even then what common factor appears?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

When (a) and (b) are both even, (2) is common to both. This contradicts being coprime.

Step 2

Why this answer is correct

The correct answer is A. (2). When (a) and (b) are both even, (2) is common to both. This contradicts being coprime.

Step 3

Exam Tip

जब (a) और (b) दोनों सम हों तो दोनों में (2) सामान्य होता है। यह सहभाज्य होने के विरुद्ध है।

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\(\sqrt{3}\) के प्रमाण में (q) भी (3) से विभाज्य निकलने पर कौन-सा सामान्य गुणनखंड बनता है?

In the proof of \(\sqrt{3}\), if (q) is also divisible by (3), what common factor appears?

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

When (p) and (q) are both divisible by (3), (3) is a common factor. This is the contradiction.

Step 2

Why this answer is correct

The correct answer is B. (3). When (p) and (q) are both divisible by (3), (3) is a common factor. This is the contradiction.

Step 3

Exam Tip

जब (p) और (q) दोनों (3) से विभाज्य हों तो (3) सामान्य गुणनखंड है। यही विरोधाभास है।

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कौन-सा निष्कर्ष \(\sqrt{2}\) के प्रमाण में गलत नहीं है?

Which conclusion is not wrong in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

C. \(\sqrt{2}\) अपरिमेय सिद्ध हुआ\(\sqrt{2}\) is proved irrational

Step 1

Concept

The rational assumption leads to contradiction. So the correct conclusion is that \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{2}\) अपरिमेय सिद्ध हुआ / \(\sqrt{2}\) is proved irrational. The rational assumption leads to contradiction. So the correct conclusion is that \(\sqrt{2}\) is irrational.

Step 3

Exam Tip

परिमेय मान्यता से विरोधाभास आता है। इसलिए सही निष्कर्ष \(\sqrt{2}\) अपरिमेय है।

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कौन-सा निष्कर्ष \(\sqrt{3}\) के प्रमाण में सही है?

Which conclusion is correct in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

D. \(\sqrt{3}\) अपरिमेय है\(\sqrt{3}\) is irrational

Step 1

Concept

The rational assumption breaks the coprime condition. Therefore \(\sqrt{3}\) is irrational.

Step 2

Why this answer is correct

The correct answer is D. \(\sqrt{3}\) अपरिमेय है / \(\sqrt{3}\) is irrational. The rational assumption breaks the coprime condition. Therefore \(\sqrt{3}\) is irrational.

Step 3

Exam Tip

परिमेय मान्यता से सहभाज्य शर्त टूटती है। इसलिए \(\sqrt{3}\) अपरिमेय है।

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यदि किसी संख्या का वर्ग सम नहीं है तो वह संख्या कैसी होगी?

If the square of a number is not even then what type is the number?

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Correct Answer

A. विषमOdd

Step 1

Concept

For integers, evenness of the square is linked with evenness of the number. If the square is not even, the number is not even.

Step 2

Why this answer is correct

The correct answer is A. विषम / Odd. For integers, evenness of the square is linked with evenness of the number. If the square is not even, the number is not even.

Step 3

Exam Tip

पूर्णांक के लिए वर्ग की समता संख्या की समता से जुड़ी होती है। वर्ग सम न हो तो संख्या सम नहीं होगी।

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यदि कोई संख्या (3) से विभाज्य नहीं है तो उसका वर्ग किससे जरूर विभाज्य नहीं होगा?

If a number is not divisible by (3), then its square is surely not divisible by what?

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

Prime factor (3) appears in the square only when it appears in the number. This supports the proof of \(\sqrt{3}\).

Step 2

Why this answer is correct

The correct answer is B. (3). Prime factor (3) appears in the square only when it appears in the number. This supports the proof of \(\sqrt{3}\).

Step 3

Exam Tip

अभाज्य गुणनखंड (3) वर्ग में तभी आता है जब संख्या में (3) हो। यह \(\sqrt{3}\) के प्रमाण का आधार है।

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\(\sqrt{2}\) के प्रमाण में (a=2k) रखने के बाद \(a^2\) किसके बराबर होगा?

In the proof of \(\sqrt{2}\), after taking (a=2k), what is \(a^2\) equal to?

Explanation opens after your attempt
Correct Answer

B. \(4k^2\)

Step 1

Concept

If (a=2k), then (a-2=(2k)2=4k-2). This is substituted into \(a^2=2b^2\).

Step 2

Why this answer is correct

The correct answer is B. \(4k^2\). If (a=2k), then (a-2=(2k)2=4k-2). This is substituted into \(a^2=2b^2\).

Step 3

Exam Tip

यदि (a=2k) है तो (a-2=(2k)2=4k-2) होगा। इसको \(a^2=2b^2\) में रखा जाता है।

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\(\sqrt{3}\) के प्रमाण में (p=3r) रखने के बाद \(p^2\) किसके बराबर होगा?

In the proof of \(\sqrt{3}\), after taking (p=3r), what is \(p^2\) equal to?

Explanation opens after your attempt
Correct Answer

C. \(9r^2\)

Step 1

Concept

If (p=3r), then (p-2=(3r)2=9r-2). This is the next algebraic step.

Step 2

Why this answer is correct

The correct answer is C. \(9r^2\). If (p=3r), then (p-2=(3r)2=9r-2). This is the next algebraic step.

Step 3

Exam Tip

यदि (p=3r) है तो (p-2=(3r)2=9r-2) होगा। यही अगला बीजगणितीय कदम है।

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\(\sqrt{2}\) की अपरिमेयता में कौन-सा अभाज्य गुणनखंड मुख्य है?

Which prime factor is central in the irrationality of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

The proof of \(\sqrt{2}\) uses evenness and factor (2). So (2) is central.

Step 2

Why this answer is correct

The correct answer is A. (2). The proof of \(\sqrt{2}\) uses evenness and factor (2). So (2) is central.

Step 3

Exam Tip

\(\sqrt{2}\) के प्रमाण में समता और गुणनखंड (2) का उपयोग होता है। इसलिए (2) मुख्य है।

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\(\sqrt{3}\) की अपरिमेयता में कौन-सा अभाज्य गुणनखंड मुख्य है?

Which prime factor is central in the irrationality of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

The proof of \(\sqrt{3}\) uses divisibility by (3). So (3) is the central factor.

Step 2

Why this answer is correct

The correct answer is B. (3). The proof of \(\sqrt{3}\) uses divisibility by (3). So (3) is the central factor.

Step 3

Exam Tip

\(\sqrt{3}\) के प्रमाण में (3) से विभाज्यता का उपयोग होता है। इसलिए (3) मुख्य गुणनखंड है।

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\(\sqrt{2}\) के प्रमाण में \(\frac{a}{b}\) को सरलतम रूप में लेना क्यों जरूरी है?

Why is it necessary to take \(\frac{a}{b}\) in lowest form in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. ताकि सहभाज्य मान्यता से विरोधाभास दिख सकेSo contradiction with coprime assumption can be shown

Step 1

Concept

In lowest form (a) and (b) are coprime. Later both becoming even contradicts this.

Step 2

Why this answer is correct

The correct answer is A. ताकि सहभाज्य मान्यता से विरोधाभास दिख सके / So contradiction with coprime assumption can be shown. In lowest form (a) and (b) are coprime. Later both becoming even contradicts this.

Step 3

Exam Tip

सरलतम रूप में (a) और (b) सहभाज्य होते हैं। बाद में दोनों सम निकलना इसी से विरोधाभास देता है।

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\(\sqrt{3}\) के प्रमाण में \(\frac{p}{q}\) को सरलतम रूप में लेना क्यों जरूरी है?

Why is it necessary to take \(\frac{p}{q}\) in lowest form in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. ताकि सहभाज्य मान्यता से विरोधाभास दिख सकेSo contradiction with coprime assumption can be shown

Step 1

Concept

In lowest form (p) and (q) are coprime. Both being divisible by (3) contradicts this.

Step 2

Why this answer is correct

The correct answer is B. ताकि सहभाज्य मान्यता से विरोधाभास दिख सके / So contradiction with coprime assumption can be shown. In lowest form (p) and (q) are coprime. Both being divisible by (3) contradicts this.

Step 3

Exam Tip

सरलतम रूप में (p) और (q) सहभाज्य होते हैं। दोनों का (3) से विभाज्य होना इसी से विरोधाभास देता है।

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\(\sqrt{2}\) के प्रमाण में गलत मान्यता कौन-सी सिद्ध होती है?

Which assumption is proved false in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\) परिमेय है\(\sqrt{2}\) is rational

Step 1

Concept

The contradiction proves only the rational assumption false. Therefore \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\) परिमेय है / \(\sqrt{2}\) is rational. The contradiction proves only the rational assumption false. Therefore \(\sqrt{2}\) is irrational.

Step 3

Exam Tip

विरोधाभास केवल परिमेय मान्यता को गलत सिद्ध करता है। इसलिए \(\sqrt{2}\) अपरिमेय है।

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\(\sqrt{3}\) के प्रमाण में गलत मान्यता कौन-सी सिद्ध होती है?

Which assumption is proved false in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. \(\sqrt{3}\) परिमेय है\(\sqrt{3}\) is rational

Step 1

Concept

The contradiction makes the rational assumption false. Therefore \(\sqrt{3}\) is proved irrational.

Step 2

Why this answer is correct

The correct answer is B. \(\sqrt{3}\) परिमेय है / \(\sqrt{3}\) is rational. The contradiction makes the rational assumption false. Therefore \(\sqrt{3}\) is proved irrational.

Step 3

Exam Tip

विरोधाभास से परिमेय मान्यता गलत होती है। इसलिए \(\sqrt{3}\) अपरिमेय सिद्ध होता है।

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दोनों प्रमाणों में संख्या को पहले किस रूप में लिखा जाता है?

In both proofs in what form is the number first written?

Explanation opens after your attempt
Correct Answer

A. सरलतम भिन्न के रूप मेंIn lowest fraction form

Step 1

Concept

After assuming rationality, the number is written in lowest fraction form. This gives the coprime condition.

Step 2

Why this answer is correct

The correct answer is A. सरलतम भिन्न के रूप में / In lowest fraction form. After assuming rationality, the number is written in lowest fraction form. This gives the coprime condition.

Step 3

Exam Tip

परिमेय मानकर संख्या को सरलतम भिन्न में लिखा जाता है। इसी से सहभाज्य शर्त मिलती है।

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\(\sqrt{2}\) और \(\sqrt{3}\) के प्रमाणों में कौन-सी बात समान है?

What is common in the proofs of \(\sqrt{2}\) and \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. दोनों में विरोधाभास विधि हैBoth use contradiction method

Step 1

Concept

Both proofs first assume rationality. Then a contradiction with coprime condition is obtained.

Step 2

Why this answer is correct

The correct answer is A. दोनों में विरोधाभास विधि है / Both use contradiction method. Both proofs first assume rationality. Then a contradiction with coprime condition is obtained.

Step 3

Exam Tip

दोनों प्रमाणों में पहले परिमेय मानते हैं। फिर सहभाज्य शर्त से विरोधाभास मिलता है।

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\(\sqrt{2}\) के प्रमाण में (a) और (b) दोनों सम निकलने पर कौन-सा निष्कर्ष नहीं लेना चाहिए?

In the proof of \(\sqrt{2}\), when both (a) and (b) are even, which conclusion should not be taken?

Explanation opens after your attempt
Correct Answer

A. \(\frac{a}{b}\) सरलतम रूप में था\(\frac{a}{b}\) was in lowest form

Step 1

Concept

If both are even, the fraction cannot be in lowest form. So the first conclusion should not be taken.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{a}{b}\) सरलतम रूप में था / \(\frac{a}{b}\) was in lowest form. If both are even, the fraction cannot be in lowest form. So the first conclusion should not be taken.

Step 3

Exam Tip

दोनों सम हों तो भिन्न सरलतम रूप में नहीं रह सकती। इसलिए पहला निष्कर्ष नहीं लेना चाहिए।

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\(\sqrt{3}\) के प्रमाण में (p) और (q) दोनों (3) से विभाज्य मिलें तो कौन-सा निष्कर्ष सही है?

In the proof of \(\sqrt{3}\), if both (p) and (q) are divisible by (3), which conclusion is correct?

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Correct Answer

A. वे सहभाज्य नहीं हो सकतेThey cannot be coprime

Step 1

Concept

Both have common factor (3). Therefore they cannot be coprime.

Step 2

Why this answer is correct

The correct answer is A. वे सहभाज्य नहीं हो सकते / They cannot be coprime. Both have common factor (3). Therefore they cannot be coprime.

Step 3

Exam Tip

दोनों में (3) सामान्य गुणनखंड है। इसलिए वे सहभाज्य नहीं हो सकते।

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\(\sqrt{2}\) और \(\sqrt{3}\) की अपरिमेयता सिद्ध करने का मुख्य उद्देश्य क्या है?

What is the main aim of proving irrationality of \(\sqrt{2}\) and \(\sqrt{3}\)?

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Correct Answer

A. यह दिखाना कि इन्हें सरलतम परिमेय भिन्न में नहीं लिखा जा सकताTo show they cannot be written as lowest rational fractions

Step 1

Concept

An irrational number cannot be written as a ratio of two integers. Both proofs establish this fact.

Step 2

Why this answer is correct

The correct answer is A. यह दिखाना कि इन्हें सरलतम परिमेय भिन्न में नहीं लिखा जा सकता / To show they cannot be written as lowest rational fractions. An irrational number cannot be written as a ratio of two integers. Both proofs establish this fact.

Step 3

Exam Tip

अपरिमेय संख्या को दो पूर्णांकों के अनुपात में नहीं लिखा जा सकता। दोनों प्रमाण यही बात सिद्ध करते हैं।

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\(\sqrt{2}\) के प्रमाण में \(a^2=2b^2\) मिलने के बाद सबसे पहला निष्कर्ष क्या लिया जाता है?

In the proof of \(\sqrt{2}\), what is the first conclusion after getting \(a^2=2b^2\)?

Explanation opens after your attempt
Correct Answer

A. \(a^2\) सम है\(a^2\) is even

Step 1

Concept

In \(a^2=2b^2\), the right side has factor (2). Therefore \(a^2\) is considered even.

Step 2

Why this answer is correct

The correct answer is A. \(a^2\) सम है / \(a^2\) is even. In \(a^2=2b^2\), the right side has factor (2). Therefore \(a^2\) is considered even.

Step 3

Exam Tip

\(a^2=2b^2\) में दाएँ पक्ष में (2) का गुणनखंड है। इसलिए \(a^2\) सम माना जाता है।

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\(\sqrt{3}\) के प्रमाण में (p=3r) रखने का अगला उद्देश्य क्या होता है?

In the proof of \(\sqrt{3}\), what is the next purpose of taking (p=3r)?

Explanation opens after your attempt
Correct Answer

A. यह दिखाना कि (q) भी (3) से विभाज्य हैTo show that (q) is also divisible by (3)

Step 1

Concept

Taking (p=3r) gives \(q^2=3r^2\) next. This proves (q) is also divisible by (3).

Step 2

Why this answer is correct

The correct answer is A. यह दिखाना कि (q) भी (3) से विभाज्य है / To show that (q) is also divisible by (3). Taking (p=3r) gives \(q^2=3r^2\) next. This proves (q) is also divisible by (3).

Step 3

Exam Tip

(p=3r) रखने पर आगे \(q^2=3r^2\) मिलता है। इससे (q) भी (3) से विभाज्य सिद्ध होता है।

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