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Class 9 Mathematics Easy Quiz

Level 21 • 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

\(\sqrt{2}\) की अपरिमेयता सिद्ध करने में विरोधाभास विधि की शुरुआत किस मान्यता से होती है?

In proving irrationality of \(\sqrt{2}\), with which assumption does contradiction method begin?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

In contradiction method we first assume the opposite that \(\sqrt{2}\) is rational. Later this assumption is shown false.

Step 2

Why this answer is correct

The correct answer is B. \(\sqrt{2}\) परिमेय है / \(\sqrt{2}\) is rational. In contradiction method we first assume the opposite that \(\sqrt{2}\) is rational. Later this assumption is shown false.

Step 3

Exam Tip

विरोधाभास विधि में पहले उल्टा मानते हैं कि \(\sqrt{2}\) परिमेय है। बाद में यही मान्यता गलत सिद्ध होती है।

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\(\sqrt{3}\) को अपरिमेय सिद्ध करते समय पहली परिमेय मान्यता कौन-सी होती है?

While proving \(\sqrt{3}\) irrational, what is the first rational assumption?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

When assumed rational, \(\sqrt{3}\) is written as \(\frac{p}{q}\). Here (p) and (q) are integers.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{3}=\frac{p}{q}\). When assumed rational, \(\sqrt{3}\) is written as \(\frac{p}{q}\). Here (p) and (q) are integers.

Step 3

Exam Tip

परिमेय मानने पर \(\sqrt{3}\) को \(\frac{p}{q}\) के रूप में लिखा जाता है। यहाँ (p) और (q) पूर्णांक होते हैं।

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परिमेय संख्या को \(\frac{p}{q}\) के सरलतम रूप में लिखते समय (p) और (q) के बारे में क्या सही है?

When a rational number is written in lowest form \(\frac{p}{q}\), what is true about (p) and (q)?

Explanation opens after your attempt
Correct Answer

A. वे सहभाज्य होते हैंThey are coprime

Step 1

Concept

In lowest form, the numerator and denominator have only (1) as common factor. This means they are coprime.

Step 2

Why this answer is correct

The correct answer is A. वे सहभाज्य होते हैं / They are coprime. In lowest form, the numerator and denominator have only (1) as common factor. This means they are coprime.

Step 3

Exam Tip

सरलतम रूप में अंश और हर का सामान्य गुणनखंड केवल (1) होता है। यही सहभाज्य होने का अर्थ है।

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\(\frac{a}{b}\) रूप में \(b\neq0\) क्यों लिखा जाता है?

Why is \(b\neq0\) written in the form \(\frac{a}{b}\)?

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 \(b\neq0\) is necessary in \(\frac{a}{b}\).

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 \(b\neq0\) is necessary in \(\frac{a}{b}\).

Step 3

Exam Tip

भिन्न में हर शून्य नहीं हो सकता। इसलिए \(\frac{a}{b}\) में \(b\neq0\) जरूरी है।

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

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

Explanation opens after your attempt
Correct Answer

B. \(m^2=2n^2\)

Step 1

Concept

Squaring gives \(2=\frac{m^2}{n^2}\). This gives \(m^2=2n^2\).

Step 2

Why this answer is correct

The correct answer is B. \(m^2=2n^2\). Squaring gives \(2=\frac{m^2}{n^2}\). This gives \(m^2=2n^2\).

Step 3

Exam Tip

वर्ग करने पर \(2=\frac{m^2}{n^2}\) मिलता है। इससे \(m^2=2n^2\) बनता है।

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\(\sqrt{3}=\frac{r}{s}\) को वर्ग करने के बाद सही समीकरण कौन-सा है?

After squaring \(\sqrt{3}=\frac{r}{s}\), which equation is correct?

Explanation opens after your attempt
Correct Answer

C. \(r^2=3s^2\)

Step 1

Concept

Squaring gives \(3=\frac{r^2}{s^2}\). Therefore \(r^2=3s^2\) is correct.

Step 2

Why this answer is correct

The correct answer is C. \(r^2=3s^2\). Squaring gives \(3=\frac{r^2}{s^2}\). Therefore \(r^2=3s^2\) is correct.

Step 3

Exam Tip

वर्ग करने से \(3=\frac{r^2}{s^2}\) होता है। इसलिए \(r^2=3s^2\) सही है।

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यदि \(m^2=2n^2\) है तो \(m^2\) के बारे में कौन-सा निष्कर्ष सही है?

If \(m^2=2n^2\), which conclusion about \(m^2\) is correct?

Explanation opens after your attempt
Correct Answer

A. \(m^2\) सम है\(m^2\) is even

Step 1

Concept

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

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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यदि \(r^2=3s^2\) है तो \(r^2\) के बारे में क्या सही है?

If \(r^2=3s^2\), what is true about \(r^2\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

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

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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यदि किसी पूर्णांक (x) का वर्ग सम है तो (x) कैसा होगा?

If the square of an integer (x) is even, what type is (x)?

Explanation opens after your attempt
Correct Answer

B. समEven

Step 1

Concept

If an integer has an even square, 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 B. सम / Even. If an integer has an even square, the integer is also even. This is the key fact in the proof of \(\sqrt{2}\).

Step 3

Exam Tip

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 किसी पूर्णांक (x) का वर्ग (3) से विभाज्य है तो (x) किससे विभाज्य होगा?

If the square of an integer (x) is divisible by (3), then (x) is divisible by what?

Explanation opens after your attempt
Correct Answer

C. (3)

Step 1

Concept

If prime factor (3) divides a square, it divides the number too. Therefore (x) is divisible by (3).

Step 2

Why this answer is correct

The correct answer is C. (3). If prime factor (3) divides a square, it divides the number too. Therefore (x) is divisible by (3).

Step 3

Exam Tip

अभाज्य गुणनखंड (3) वर्ग को विभाजित करे तो संख्या को भी विभाजित करता है। इसलिए (x) (3) से विभाज्य है।

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\(\sqrt{2}\) के प्रमाण में (m) सम सिद्ध होने पर (m) को कैसे लिखा जाता है?

In the proof of \(\sqrt{2}\), once (m) is proved even, how is (m) written?

Explanation opens after your attempt
Correct Answer

A. (m=2k)

Step 1

Concept

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

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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\(\sqrt{3}\) के प्रमाण में (r) (3) से विभाज्य सिद्ध होने पर (r) को कैसे लिखा जाता है?

In the proof of \(\sqrt{3}\), once (r) is proved divisible by (3), how is (r) written?

Explanation opens after your attempt
Correct Answer

D. (r=3t)

Step 1

Concept

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

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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

If (m=2k) and \(m^2=2n^2\), which relation follows?

Explanation opens after your attempt
Correct Answer

B. \(n^2=2k^2\)

Step 1

Concept

Putting (m=2k) gives \(4k^2=2n^2\). Therefore \(n^2=2k^2\).

Step 2

Why this answer is correct

The correct answer is B. \(n^2=2k^2\). Putting (m=2k) gives \(4k^2=2n^2\). Therefore \(n^2=2k^2\).

Step 3

Exam Tip

(m=2k) रखने पर \(4k^2=2n^2\) मिलता है। इसलिए \(n^2=2k^2\) बनता है।

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यदि (r=3t) और \(r^2=3s^2\) है तो आगे क्या मिलता है?

If (r=3t) and \(r^2=3s^2\), what follows next?

Explanation opens after your attempt
Correct Answer

C. \(s^2=3t^2\)

Step 1

Concept

Putting (r=3t) gives \(9t^2=3s^2\). Simplifying gives \(s^2=3t^2\).

Step 2

Why this answer is correct

The correct answer is C. \(s^2=3t^2\). Putting (r=3t) gives \(9t^2=3s^2\). Simplifying gives \(s^2=3t^2\).

Step 3

Exam Tip

(r=3t) रखने पर \(9t^2=3s^2\) मिलता है। सरल करने पर \(s^2=3t^2\) मिलता है।

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\(\sqrt{2}\) के प्रमाण में \(n^2=2k^2\) से (n) के बारे में क्या निष्कर्ष मिलता है?

In the proof of \(\sqrt{2}\), what conclusion about (n) follows from \(n^2=2k^2\)?

Explanation opens after your attempt
Correct Answer

C. (n) सम है(n) is even

Step 1

Concept

Since \(n^2\) is even, (n) is also even. Thus both numerator and denominator become even.

Step 2

Why this answer is correct

The correct answer is C. (n) सम है / (n) is even. Since \(n^2\) is even, (n) is also even. Thus both numerator and denominator become even.

Step 3

Exam Tip

\(n^2\) सम है इसलिए (n) भी सम होगा। इससे अंश और हर दोनों सम हो जाते हैं।

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\(\sqrt{3}\) के प्रमाण में \(s^2=3t^2\) से (s) के बारे में क्या निष्कर्ष मिलता है?

In the proof of \(\sqrt{3}\), what conclusion about (s) follows from \(s^2=3t^2\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Since \(s^2\) is divisible by (3), (s) is also divisible by (3). This leads to the final contradiction.

Step 2

Why this answer is correct

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

Step 3

Exam Tip

\(s^2\) (3) से विभाज्य है इसलिए (s) भी (3) से विभाज्य होगा। यही अंतिम विरोधाभास की ओर ले जाता है।

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\(\sqrt{2}\) के प्रमाण में (m) और (n) दोनों सम निकलने पर क्या विरोधाभास होता है?

In the proof of \(\sqrt{2}\), what contradiction occurs when both (m) and (n) become even?

Explanation opens after your attempt
Correct Answer

A. वे सहभाज्य नहीं रह सकतेThey cannot remain coprime

Step 1

Concept

If both are even, (2) is a common factor. This contradicts the coprime assumption.

Step 2

Why this answer is correct

The correct answer is A. वे सहभाज्य नहीं रह सकते / They cannot remain coprime. If both are even, (2) is a common factor. This contradicts the coprime assumption.

Step 3

Exam Tip

दोनों सम होने पर (2) सामान्य गुणनखंड होता है। यह सहभाज्य मान्यता से विरोधाभास है।

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\(\sqrt{3}\) के प्रमाण में (r) और (s) दोनों (3) से विभाज्य निकलने पर क्या विरोधाभास होता है?

In the proof of \(\sqrt{3}\), what contradiction occurs when both (r) and (s) become divisible by (3)?

Explanation opens after your attempt
Correct Answer

B. वे सहभाज्य नहीं रह सकतेThey cannot remain 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 B. वे सहभाज्य नहीं रह सकते / They cannot remain coprime. Both have common factor (3). Therefore they cannot be coprime.

Step 3

Exam Tip

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

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\(\sqrt{2}\) की अपरिमेयता सिद्ध होने पर सही अंतिम निष्कर्ष क्या है?

After proving irrationality of \(\sqrt{2}\), what is the correct final conclusion?

Explanation opens after your attempt
Correct Answer

C. \(\sqrt{2}\) अपरिमेय है\(\sqrt{2}\) is irrational

Step 1

Concept

The rational assumption led to a contradiction. Therefore \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{2}\) अपरिमेय है / \(\sqrt{2}\) is irrational. The rational assumption led to a contradiction. Therefore \(\sqrt{2}\) is irrational.

Step 3

Exam Tip

परिमेय मान्यता से विरोधाभास मिला। इसलिए \(\sqrt{2}\) अपरिमेय है।

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\(\sqrt{3}\) की अपरिमेयता सिद्ध होने पर सही अंतिम निष्कर्ष क्या है?

After proving irrationality of \(\sqrt{3}\), what is the correct final conclusion?

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 proved 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 proved irrational.

Step 3

Exam Tip

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

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

Which prime factor is central in the proof 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). Therefore (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). Therefore (2) is central.

Step 3

Exam Tip

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

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

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

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

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

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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विरोधाभास विधि में शुरुआत में उल्टा क्यों माना जाता है?

Why is the opposite assumed at the beginning in contradiction method?

Explanation opens after your attempt
Correct Answer

C. विरोधाभास दिखाने के लिएTo show a contradiction

Step 1

Concept

An impossible situation is derived from the opposite assumption. This proves the original statement.

Step 2

Why this answer is correct

The correct answer is C. विरोधाभास दिखाने के लिए / To show a contradiction. An impossible situation is derived from the opposite assumption. This proves the original statement.

Step 3

Exam Tip

उल्टी मान्यता से असंभव स्थिति निकाली जाती है। इससे मूल कथन सिद्ध होता है।

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\(\sqrt{2}\) को \(\frac{m}{n}\) मानने का अर्थ क्या है?

What does assuming \(\sqrt{2}\) as \(\frac{m}{n}\) mean?

Explanation opens after your attempt
Correct Answer

A. उसे परिमेय माननाAssuming it rational

Step 1

Concept

A rational number can be written as a ratio of two integers. So \(\sqrt{2}=\frac{m}{n}\) is a rational assumption.

Step 2

Why this answer is correct

The correct answer is A. उसे परिमेय मानना / Assuming it rational. A rational number can be written as a ratio of two integers. So \(\sqrt{2}=\frac{m}{n}\) is a rational assumption.

Step 3

Exam Tip

परिमेय संख्या दो पूर्णांकों के अनुपात में लिखी जा सकती है। इसलिए \(\sqrt{2}=\frac{m}{n}\) परिमेय मान्यता है।

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\(\sqrt{3}\) को \(\frac{r}{s}\) मानने का अर्थ क्या है?

What does assuming \(\sqrt{3}\) as \(\frac{r}{s}\) mean?

Explanation opens after your attempt
Correct Answer

B. उसे परिमेय माननाAssuming it rational

Step 1

Concept

If a number is written as \(\frac{r}{s}\), it is being assumed rational. This is the initial assumption of the proof.

Step 2

Why this answer is correct

The correct answer is B. उसे परिमेय मानना / Assuming it rational. If a number is written as \(\frac{r}{s}\), it is being assumed rational. This is the initial assumption of the proof.

Step 3

Exam Tip

यदि कोई संख्या \(\frac{r}{s}\) के रूप में लिखी जाए तो वह परिमेय मानी जा रही है। यही प्रमाण की प्रारंभिक मान्यता है।

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\(\sqrt{2}\) के प्रमाण में \(\frac{m}{n}\) को सरलतम रूप में क्यों लेते हैं?

Why is \(\frac{m}{n}\) taken in lowest form in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

C. ताकि सहभाज्य शर्त से विरोधाभास दिखेSo contradiction with coprime condition can be shown

Step 1

Concept

In lowest form (m) and (n) are coprime. Both becoming even contradicts this.

Step 2

Why this answer is correct

The correct answer is C. ताकि सहभाज्य शर्त से विरोधाभास दिखे / So contradiction with coprime condition can be shown. In lowest form (m) and (n) are coprime. Both becoming even contradicts this.

Step 3

Exam Tip

सरलतम रूप में (m) और (n) सहभाज्य होते हैं। दोनों सम निकलना इसी बात से टकराता है।

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\(\sqrt{3}\) के प्रमाण में \(\frac{r}{s}\) को सरलतम रूप में लेने का उद्देश्य क्या है?

What is the purpose of taking \(\frac{r}{s}\) in lowest form in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

D. सहभाज्य मान्यता से विरोधाभास दिखानाTo show contradiction with coprime assumption

Step 1

Concept

In lowest form (r) and (s) are coprime. Both being divisible by (3) gives a contradiction.

Step 2

Why this answer is correct

The correct answer is D. सहभाज्य मान्यता से विरोधाभास दिखाना / To show contradiction with coprime assumption. In lowest form (r) and (s) are coprime. Both being divisible by (3) gives a contradiction.

Step 3

Exam Tip

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

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\(\sqrt{2}\) के प्रमाण का सही छोटा क्रम कौन-सा है?

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

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Correct Answer

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

Step 1

Concept

First \(\sqrt{2}\) is assumed rational. Then squaring gives the contradiction that both are 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. First \(\sqrt{2}\) is assumed rational. Then squaring gives the contradiction that both are even.

Step 3

Exam Tip

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

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\(\sqrt{3}\) के प्रमाण का सही छोटा क्रम कौन-सा है?

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

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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

For \(\sqrt{3}\), after the rational assumption we square. Then both numbers becoming divisible by (3) gives a contradiction.

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). For \(\sqrt{3}\), after the rational assumption we square. Then both numbers becoming divisible by (3) gives a contradiction.

Step 3

Exam Tip

\(\sqrt{3}\) में परिमेय मान्यता के बाद वर्ग करते हैं। फिर दोनों संख्याओं का (3) से विभाज्य होना विरोधाभास देता है।

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\(\sqrt{2}\) के प्रमाण में (m=2k) रखने के बाद \(m^2\) किसके बराबर होता है?

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

Explanation opens after your attempt
Correct Answer

C. \(4k^2\)

Step 1

Concept

((2k)2=4k-2). This is then substituted in \(m^2=2n^2\).

Step 2

Why this answer is correct

The correct answer is C. \(4k^2\). ((2k)2=4k-2). This is then substituted in \(m^2=2n^2\).

Step 3

Exam Tip

((2k)2=4k-2) होता है। यही आगे \(m^2=2n^2\) में रखा जाता है।

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\(\sqrt{3}\) के प्रमाण में (r=3t) रखने के बाद \(r^2\) किसके बराबर होता है?

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

Explanation opens after your attempt
Correct Answer

D. \(9t^2\)

Step 1

Concept

((3t)2=9t-2). This substitution moves the proof forward.

Step 2

Why this answer is correct

The correct answer is D. \(9t^2\). ((3t)2=9t-2). This substitution moves the proof forward.

Step 3

Exam Tip

((3t)2=9t-2) होता है। यह प्रतिस्थापन प्रमाण को आगे बढ़ाता है।

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\(\sqrt{2}\) के प्रमाण में दोनों संख्याएँ सम निकलने पर कौन-सा सामान्य गुणनखंड मिलता है?

In the proof of \(\sqrt{2}\), when both numbers are found even, which common factor is obtained?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

Both being even means both are divisible by (2). Therefore the common factor is (2).

Step 2

Why this answer is correct

The correct answer is A. (2). Both being even means both are divisible by (2). Therefore the common factor is (2).

Step 3

Exam Tip

दोनों सम होने का अर्थ है कि दोनों (2) से विभाज्य हैं। इसलिए सामान्य गुणनखंड (2) है।

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\(\sqrt{3}\) के प्रमाण में दोनों संख्याएँ (3) से विभाज्य निकलने पर कौन-सा सामान्य गुणनखंड मिलता है?

In the proof of \(\sqrt{3}\), when both numbers are divisible by (3), which common factor is obtained?

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

Both being divisible by (3) shows common factor (3). This contradicts the coprime assumption.

Step 2

Why this answer is correct

The correct answer is B. (3). Both being divisible by (3) shows common factor (3). This contradicts the coprime assumption.

Step 3

Exam Tip

दोनों का (3) से विभाज्य होना सामान्य गुणनखंड (3) दिखाता है। यह सहभाज्य मान्यता से विरोधाभास है।

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सहभाज्य संख्याओं का महत्तम समापवर्तक क्या होता है?

What is the highest common factor of coprime numbers?

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Correct Answer

C. (1)

Step 1

Concept

Coprime numbers have only (1) as common factor. Therefore their highest common factor is (1).

Step 2

Why this answer is correct

The correct answer is C. (1). Coprime numbers have only (1) as common factor. Therefore their highest common factor is (1).

Step 3

Exam Tip

सहभाज्य संख्याओं का सामान्य गुणनखंड केवल (1) होता है। इसलिए उनका महत्तम समापवर्तक (1) है।

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\(\sqrt{2}\) के प्रमाण में यदि \(\frac{m}{n}\) सरलतम रूप में है तो कौन-सी स्थिति असंभव है?

In the proof of \(\sqrt{2}\), if \(\frac{m}{n}\) is in lowest form, which situation is impossible?

Explanation opens after your attempt
Correct Answer

D. (m) और (n) दोनों सम हैंBoth (m) and (n) are even

Step 1

Concept

In lowest form both should not have a common factor. If both are even, (2) becomes common.

Step 2

Why this answer is correct

The correct answer is D. (m) और (n) दोनों सम हैं / Both (m) and (n) are even. In lowest form both should not have a common factor. If both are even, (2) becomes common.

Step 3

Exam Tip

सरलतम रूप में दोनों का सामान्य गुणनखंड नहीं होना चाहिए। दोनों सम हों तो (2) सामान्य हो जाएगा।

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\(\sqrt{3}\) के प्रमाण में यदि \(\frac{r}{s}\) सरलतम रूप में है तो कौन-सी स्थिति असंभव है?

In the proof of \(\sqrt{3}\), if \(\frac{r}{s}\) is in lowest form, which situation is impossible?

Explanation opens after your attempt
Correct Answer

A. (r) और (s) दोनों (3) से विभाज्य हैंBoth (r) and (s) are divisible by (3)

Step 1

Concept

Both being divisible by (3) gives common factor (3). This is against lowest form.

Step 2

Why this answer is correct

The correct answer is A. (r) और (s) दोनों (3) से विभाज्य हैं / Both (r) and (s) are divisible by (3). Both being divisible by (3) gives common factor (3). This is against lowest form.

Step 3

Exam Tip

दोनों का (3) से विभाज्य होना सामान्य गुणनखंड (3) देता है। यह सरलतम रूप के विरुद्ध है।

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\(\sqrt{2}\) के प्रमाण में दशमलव मान निकालना क्यों जरूरी नहीं है?

Why is finding the decimal value not necessary in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

B. क्योंकि प्रमाण विभाज्यता और विरोधाभास पर आधारित हैBecause the proof is based on divisibility and contradiction

Step 1

Concept

This proof uses evenness and the coprime condition instead of decimals. This is what should be written in exams.

Step 2

Why this answer is correct

The correct answer is B. क्योंकि प्रमाण विभाज्यता और विरोधाभास पर आधारित है / Because the proof is based on divisibility and contradiction. This proof uses evenness and the coprime condition instead of decimals. This is what should be written in exams.

Step 3

Exam Tip

इस प्रमाण में दशमलव की जगह समता और सहभाज्य शर्त का उपयोग होता है। यही परीक्षा में लिखना चाहिए।

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\(\sqrt{3}\) के प्रमाण में कौन-सी बात अनावश्यक है?

Which thing is unnecessary in the proof of \(\sqrt{3}\)?

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Correct Answer

C. दशमलव अनुमानDecimal approximation

Step 1

Concept

The proof of \(\sqrt{3}\) does not use decimal approximation. It uses divisibility by (3) and contradiction.

Step 2

Why this answer is correct

The correct answer is C. दशमलव अनुमान / Decimal approximation. The proof of \(\sqrt{3}\) does not use decimal approximation. It uses divisibility by (3) and contradiction.

Step 3

Exam Tip

\(\sqrt{3}\) का प्रमाण दशमलव अनुमान से नहीं होता। इसमें (3) से विभाज्यता और विरोधाभास का उपयोग होता है।

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

In the proof of \(\sqrt{2}\), what is shown false by the rational assumption?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

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

Step 2

Why this answer is correct

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

Step 3

Exam Tip

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

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\(\sqrt{3}\) के प्रमाण में परिमेय मान्यता से कौन-सा निष्कर्ष अस्वीकार होता है?

In the proof of \(\sqrt{3}\), which conclusion is rejected by the rational assumption?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The rational assumption leads to a contradiction. Therefore \(\sqrt{3}\) is not rational.

Step 2

Why this answer is correct

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

Step 3

Exam Tip

परिमेय मान्यता से विरोधाभास आता है। इसलिए \(\sqrt{3}\) परिमेय नहीं है।

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\(\sqrt{2}\) के प्रमाण में \(m^2=2n^2\) मिलने के बाद पहला जरूरी निष्कर्ष क्या है?

In the proof of \(\sqrt{2}\), what is the first necessary conclusion after \(m^2=2n^2\)?

Explanation opens after your attempt
Correct Answer

A. \(m^2\) सम है\(m^2\) is even

Step 1

Concept

In \(m^2=2n^2\), \(m^2\) is a multiple of (2). Therefore \(m^2\) is even.

Step 2

Why this answer is correct

The correct answer is A. \(m^2\) सम है / \(m^2\) is even. In \(m^2=2n^2\), \(m^2\) is a multiple of (2). Therefore \(m^2\) is even.

Step 3

Exam Tip

\(m^2=2n^2\) में \(m^2\) (2) का गुणज है। इसलिए \(m^2\) सम है।

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\(\sqrt{3}\) के प्रमाण में \(r^2=3s^2\) मिलने के बाद पहला जरूरी निष्कर्ष क्या है?

In the proof of \(\sqrt{3}\), what is the first necessary conclusion after \(r^2=3s^2\)?

Explanation opens after your attempt
Correct Answer

B. \(r^2\) (3) से विभाज्य है\(r^2\) is divisible by (3)

Step 1

Concept

In \(r^2=3s^2\), the right side has factor (3). Therefore \(r^2\) is divisible by (3).

Step 2

Why this answer is correct

The correct answer is B. \(r^2\) (3) से विभाज्य है / \(r^2\) is divisible by (3). In \(r^2=3s^2\), the right side has factor (3). Therefore \(r^2\) is divisible by (3).

Step 3

Exam Tip

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

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\(\sqrt{2}\) के प्रमाण में दोनों सम होने की स्थिति किस बात को तोड़ती है?

In the proof of \(\sqrt{2}\), what does the situation of both being even break?

Explanation opens after your attempt
Correct Answer

A. (m) और (n) का सहभाज्य होना(m) and (n) being coprime

Step 1

Concept

If both are even, they have common factor (2). Therefore they cannot remain coprime.

Step 2

Why this answer is correct

The correct answer is A. (m) और (n) का सहभाज्य होना / (m) and (n) being coprime. If both are even, they have common factor (2). Therefore they cannot remain coprime.

Step 3

Exam Tip

दोनों सम हों तो उनका सामान्य गुणनखंड (2) होगा। इसलिए वे सहभाज्य नहीं रह सकते।

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\(\sqrt{3}\) के प्रमाण में दोनों (3) से विभाज्य होने की स्थिति किस बात को तोड़ती है?

In the proof of \(\sqrt{3}\), what does the situation of both being divisible by (3) break?

Explanation opens after your attempt
Correct Answer

B. (r) और (s) का सहभाज्य होना(r) and (s) being coprime

Step 1

Concept

Both have common factor (3). This breaks the coprime condition.

Step 2

Why this answer is correct

The correct answer is B. (r) और (s) का सहभाज्य होना / (r) and (s) being coprime. Both have common factor (3). This breaks the coprime condition.

Step 3

Exam Tip

दोनों में (3) सामान्य गुणनखंड है। इससे सहभाज्य होने की शर्त टूटती है।

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\(\sqrt{2}\) और \(\sqrt{3}\) के प्रमाणों का मुख्य उद्देश्य क्या है?

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

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Correct Answer

C. दिखाना कि वे दो पूर्णांकों के अनुपात में नहीं लिखे जा सकतेTo show they cannot be written as a ratio of two integers

Step 1

Concept

An irrational number cannot be written as a ratio of two integers. These proofs establish exactly that.

Step 2

Why this answer is correct

The correct answer is C. दिखाना कि वे दो पूर्णांकों के अनुपात में नहीं लिखे जा सकते / To show they cannot be written as a ratio of two integers. An irrational number cannot be written as a ratio of two integers. These proofs establish exactly that.

Step 3

Exam Tip

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

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किस विकल्प में \(\sqrt{2}\) और \(\sqrt{3}\) दोनों के लिए सही कथन है?

Which option gives a correct statement for both \(\sqrt{2}\) and \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

D. दोनों अपरिमेय हैंBoth are irrational

Step 1

Concept

Assuming either \(\sqrt{2}\) or \(\sqrt{3}\) rational gives a contradiction. Therefore both are irrational.

Step 2

Why this answer is correct

The correct answer is D. दोनों अपरिमेय हैं / Both are irrational. Assuming either \(\sqrt{2}\) or \(\sqrt{3}\) rational gives a contradiction. Therefore both are irrational.

Step 3

Exam Tip

\(\sqrt{2}\) और \(\sqrt{3}\) दोनों के परिमेय मानने से विरोधाभास मिलता है। इसलिए दोनों अपरिमेय हैं।

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\(\sqrt{2}\) के प्रमाण में कौन-सी गलती नहीं करनी चाहिए?

Which mistake should be avoided in the proof of \(\sqrt{2}\)?

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Correct Answer

A. (m) और (n) को पहले से दोनों सम मान लेनाAssuming (m) and (n) both even from the start

Step 1

Concept

Both being even is the contradiction derived at the end. It should not be assumed at the start.

Step 2

Why this answer is correct

The correct answer is A. (m) और (n) को पहले से दोनों सम मान लेना / Assuming (m) and (n) both even from the start. Both being even is the contradiction derived at the end. It should not be assumed at the start.

Step 3

Exam Tip

दोनों सम होना प्रमाण के अंत में निकाला गया विरोधाभास है। इसे शुरुआत में नहीं मानना चाहिए।

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\(\sqrt{3}\) के प्रमाण में कौन-सी गलती नहीं करनी चाहिए?

Which mistake should be avoided in the proof of \(\sqrt{3}\)?

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Correct Answer

C. (r) और (s) को शुरुआत से ही (3) से विभाज्य माननाAssuming (r) and (s) divisible by (3) from the start

Step 1

Concept

Both being divisible by (3) is derived later in the proof. At the start they are only assumed coprime.

Step 2

Why this answer is correct

The correct answer is C. (r) और (s) को शुरुआत से ही (3) से विभाज्य मानना / Assuming (r) and (s) divisible by (3) from the start. Both being divisible by (3) is derived later in the proof. At the start they are only assumed coprime.

Step 3

Exam Tip

दोनों का (3) से विभाज्य होना प्रमाण में बाद में निकाला जाता है। शुरुआत में केवल सहभाज्य माना जाता है।

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\(\sqrt{2}\) की अपरिमेयता के प्रमाण में (m) और (n) किस प्रकार की संख्याएँ मानी जाती हैं?

In the proof of irrationality of \(\sqrt{2}\), what type of numbers are (m) and (n) assumed to be?

Explanation opens after your attempt
Correct Answer

B. पूर्णांकIntegers

Step 1

Concept

A rational number is written as a ratio of two integers. Therefore (m) and (n) are assumed integers.

Step 2

Why this answer is correct

The correct answer is B. पूर्णांक / Integers. A rational number is written as a ratio of two integers. Therefore (m) and (n) are assumed integers.

Step 3

Exam Tip

परिमेय संख्या दो पूर्णांकों के अनुपात में लिखी जाती है। इसलिए (m) और (n) पूर्णांक माने जाते हैं।

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\(\sqrt{3}\) की अपरिमेयता के प्रमाण में (r) और (s) किस प्रकार की संख्याएँ मानी जाती हैं?

In the proof of irrationality of \(\sqrt{3}\), what type of numbers are (r) and (s) assumed to be?

Explanation opens after your attempt
Correct Answer

A. पूर्णांकIntegers

Step 1

Concept

A rational number is written as a ratio of two integers. Therefore (r) and (s) are assumed integers.

Step 2

Why this answer is correct

The correct answer is A. पूर्णांक / Integers. A rational number is written as a ratio of two integers. Therefore (r) and (s) are assumed integers.

Step 3

Exam Tip

परिमेय संख्या को दो पूर्णांकों के अनुपात में लिखा जाता है। इसलिए (r) और (s) पूर्णांक माने जाते हैं।

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