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Class 9 Mathematics - Number Systems - Proof of irrationality of square root 2 and square root 3 Medium Quiz

Level 17 • 50/50 questions • 35 seconds per question.

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\(\sqrt{2}=\frac{m}{n}\) मानकर वर्ग करने के बाद \(m^2=2n^2\) मिलता है। इससे प्रमाण में अगला सही कदम कौन-सा है?

After assuming \(\sqrt{2}=\frac{m}{n}\) and squaring, we get \(m^2=2n^2\). What is the next correct step in the proof?

Explanation opens after your attempt
Correct Answer

A. \(m^2\) सम है इसलिए (m) सम है\(m^2\) is even so (m) is even

Step 1

Concept

The right side has factor (2) so \(m^2\) is even. If a square is even, the number is also even.

Step 2

Why this answer is correct

The correct answer is A. \(m^2\) सम है इसलिए (m) सम है / \(m^2\) is even so (m) is even. The right side has factor (2) so \(m^2\) is even. If a square is even, the number is also even.

Step 3

Exam Tip

दाएँ पक्ष में (2) का गुणनखंड है इसलिए \(m^2\) सम है। वर्ग सम हो तो संख्या भी सम होती है।

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\(\sqrt{3}=\frac{p}{q}\) को सरलतम रूप में मानने का मुख्य कारण क्या है?

What is the main reason for assuming \(\sqrt{3}=\frac{p}{q}\) in lowest form?

Explanation opens after your attempt
Correct Answer

B. ताकि (p) और (q) सहभाज्य होंSo that (p) and (q) are coprime

Step 1

Concept

In lowest rational form, numerator and denominator are coprime. Later both becoming divisible by (3) gives the contradiction.

Step 2

Why this answer is correct

The correct answer is B. ताकि (p) और (q) सहभाज्य हों / So that (p) and (q) are coprime. In lowest rational form, numerator and denominator are coprime. Later both becoming divisible by (3) gives the contradiction.

Step 3

Exam Tip

सरलतम परिमेय रूप में अंश और हर सहभाज्य होते हैं। बाद में दोनों का (3) से विभाज्य होना इसी से विरोधाभास देता है।

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विरोधाभास विधि में \(\sqrt{2}\) के लिए कौन-सी प्रारंभिक मान्यता ली जाती है?

In contradiction method, which initial assumption is taken for \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

In contradiction method, the opposite of the statement is assumed first. So \(\sqrt{2}\) is assumed rational to get a contradiction.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{2}\) परिमेय है / \(\sqrt{2}\) is rational. In contradiction method, the opposite of the statement is assumed first. So \(\sqrt{2}\) is assumed rational to get a contradiction.

Step 3

Exam Tip

विरोधाभास विधि में पहले कथन के विपरीत मानते हैं। इसलिए \(\sqrt{2}\) को परिमेय मानकर विरोधाभास निकाला जाता है।

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\(\sqrt{3}\) के प्रमाण में \(p^2=3q^2\) से (p=3k) क्यों लिखा जा सकता है?

In the proof of \(\sqrt{3}\), why can we write (p=3k) from \(p^2=3q^2\)?

Explanation opens after your attempt
Correct Answer

D. क्योंकि \(p^2\) (3) से विभाज्य है इसलिए (p) (3) से विभाज्य हैBecause \(p^2\) is divisible by (3), so (p) is divisible by (3)

Step 1

Concept

If prime (3) divides the square, it also divides the number. Therefore (p) is written as (3k).

Step 2

Why this answer is correct

The correct answer is D. क्योंकि \(p^2\) (3) से विभाज्य है इसलिए (p) (3) से विभाज्य है / Because \(p^2\) is divisible by (3), so (p) is divisible by (3). If prime (3) divides the square, it also divides the number. Therefore (p) is written as (3k).

Step 3

Exam Tip

अभाज्य (3) यदि वर्ग को विभाजित करे तो मूल संख्या को भी विभाजित करता है। इसलिए (p) को (3k) लिखा जाता है।

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यदि \(\sqrt{2}=\frac{m}{n}\) और (m=2r) है तो \(m^2=2n^2\) में रखने पर क्या मिलेगा?

If \(\sqrt{2}=\frac{m}{n}\) and (m=2r), what is obtained after substituting in \(m^2=2n^2\)?

Explanation opens after your attempt
Correct Answer

A. \(n^2=2r^2\)

Step 1

Concept

Putting (m=2r) gives \(4r^2=2n^2\). Simplifying gives \(n^2=2r^2\).

Step 2

Why this answer is correct

The correct answer is A. \(n^2=2r^2\). Putting (m=2r) gives \(4r^2=2n^2\). Simplifying gives \(n^2=2r^2\).

Step 3

Exam Tip

(m=2r) रखने पर \(4r^2=2n^2\) मिलता है। इसे सरल करने पर \(n^2=2r^2\) बनता है।

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\(\sqrt{3}\) के प्रमाण में \(q^2=3k^2\) मिल जाने पर अंतिम विरोधाभास की दिशा में अगला निष्कर्ष क्या है?

In the proof of \(\sqrt{3}\), after getting \(q^2=3k^2\), what is the next conclusion toward final contradiction?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

\(q^2\) is divisible by (3), so (q) is also divisible by (3). This gives common factor (3) in both (p) and (q).

Step 2

Why this answer is correct

The correct answer is B. (q) (3) से विभाज्य है / (q) is divisible by (3). \(q^2\) is divisible by (3), so (q) is also divisible by (3). This gives common factor (3) in both (p) and (q).

Step 3

Exam Tip

\(q^2\) (3) से विभाज्य है इसलिए (q) भी (3) से विभाज्य होगा। इससे (p) और (q) दोनों में सामान्य गुणनखंड (3) आता है।

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\(\sqrt{2}\) के प्रमाण में (m) और (n) दोनों सम निकलने का सही अर्थ क्या है?

In the proof of \(\sqrt{2}\), what is the correct meaning of both (m) and (n) being even?

Explanation opens after your attempt
Correct Answer

A. \(\frac{m}{n}\) सरलतम रूप में नहीं हो सकता\(\frac{m}{n}\) cannot be in lowest form

Step 1

Concept

If both are even, common factor (2) exists. This cannot happen in lowest form.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{m}{n}\) सरलतम रूप में नहीं हो सकता / \(\frac{m}{n}\) cannot be in lowest form. If both are even, common factor (2) exists. This cannot happen in lowest form.

Step 3

Exam Tip

दोनों सम हों तो सामान्य गुणनखंड (2) होता है। सरलतम रूप में ऐसा नहीं हो सकता।

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

Which statement is a wrong conclusion in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

C. (p) और (q) दोनों (3) से विभाज्य हों तब भी वे सहभाज्य हैंEven if both (p) and (q) are divisible by (3), they are coprime

Step 1

Concept

If both are divisible by (3), they cannot be coprime. That statement is wrong.

Step 2

Why this answer is correct

The correct answer is C. (p) और (q) दोनों (3) से विभाज्य हों तब भी वे सहभाज्य हैं / Even if both (p) and (q) are divisible by (3), they are coprime. If both are divisible by (3), they cannot be coprime. That statement is wrong.

Step 3

Exam Tip

दोनों (3) से विभाज्य हों तो वे सहभाज्य नहीं हो सकते। यह कथन गलत है।

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\(\sqrt{2}\) के प्रमाण में \(m^2=2n^2\) से (m) सम है। फिर (m=2r) रखने का उद्देश्य क्या है?

In the proof of \(\sqrt{2}\), (m) is even from \(m^2=2n^2\). What is the purpose of taking (m=2r)?

Explanation opens after your attempt
Correct Answer

A. (n) को भी सम सिद्ध करनाTo prove (n) is also even

Step 1

Concept

Taking (m=2r) gives \(n^2=2r^2\). This proves (n) is also even.

Step 2

Why this answer is correct

The correct answer is A. (n) को भी सम सिद्ध करना / To prove (n) is also even. Taking (m=2r) gives \(n^2=2r^2\). This proves (n) is also even.

Step 3

Exam Tip

(m=2r) रखने से \(n^2=2r^2\) मिलता है। इससे (n) भी सम सिद्ध होता है।

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\(\sqrt{3}\) के प्रमाण में \(p^2=3q^2\) से (p=3k) और फिर \(q^2=3k^2\) मिलता है। अंतिम निष्कर्ष क्या होगा?

In the proof of \(\sqrt{3}\), \(p^2=3q^2\) gives (p=3k) and then \(q^2=3k^2\). What will be the final conclusion?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

From \(q^2=3k^2\), (q) is also divisible by (3). Both (p) and (q) divisible by (3) contradicts the coprime condition.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{3}\) अपरिमेय है / \(\sqrt{3}\) is irrational. From \(q^2=3k^2\), (q) is also divisible by (3). Both (p) and (q) divisible by (3) contradicts the coprime condition.

Step 3

Exam Tip

\(q^2=3k^2\) से (q) भी (3) से विभाज्य है। (p) और (q) दोनों (3) से विभाज्य होना सहभाज्य शर्त से विरोधाभास है।

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किस विकल्प में \(\sqrt{2}\) के प्रमाण की सही तार्किक श्रृंखला है?

Which option shows the correct logical chain in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(m^2=2n^2\), (m) सम, (m=2r), (n) सम\(m^2=2n^2\), (m) even, (m=2r), (n) even

Step 1

Concept

For \(\sqrt{2}\), the chain uses evenness by (2). This makes both even and gives contradiction.

Step 2

Why this answer is correct

The correct answer is A. \(m^2=2n^2\), (m) सम, (m=2r), (n) सम / \(m^2=2n^2\), (m) even, (m=2r), (n) even. For \(\sqrt{2}\), the chain uses evenness by (2). This makes both even and gives contradiction.

Step 3

Exam Tip

\(\sqrt{2}\) में (2) से समता की श्रृंखला चलती है। यही दोनों को सम बनाकर विरोधाभास देती है।

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किस विकल्प में \(\sqrt{3}\) के प्रमाण की सही तार्किक श्रृंखला है?

Which option shows the correct logical chain in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

C. \(p^2=3q^2\), (p) (3) से विभाज्य, (p=3k), (q) (3) से विभाज्य\(p^2=3q^2\), (p) divisible by (3), (p=3k), (q) divisible by (3)

Step 1

Concept

For \(\sqrt{3}\), the chain uses divisibility by (3). It shows common factor (3) in both.

Step 2

Why this answer is correct

The correct answer is C. \(p^2=3q^2\), (p) (3) से विभाज्य, (p=3k), (q) (3) से विभाज्य / \(p^2=3q^2\), (p) divisible by (3), (p=3k), (q) divisible by (3). For \(\sqrt{3}\), the chain uses divisibility by (3). It shows common factor (3) in both.

Step 3

Exam Tip

\(\sqrt{3}\) में (3) से विभाज्यता की श्रृंखला चलती है। यह दोनों में सामान्य गुणनखंड (3) दिखाती है।

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यदि \(\frac{m}{n}\) सरलतम रूप में है और (m,n) दोनों सम निकलते हैं तो कौन-सा कथन सही है?

If \(\frac{m}{n}\) is in lowest form and both (m,n) turn out even, which statement is correct?

Explanation opens after your attempt
Correct Answer

B. यह सरलतम रूप की शर्त से विरोधाभास हैThis contradicts the condition of lowest form

Step 1

Concept

In lowest form, there should be no common factor. If both are even, (2) is common.

Step 2

Why this answer is correct

The correct answer is B. यह सरलतम रूप की शर्त से विरोधाभास है / This contradicts the condition of lowest form. In lowest form, there should be no common factor. If both are even, (2) is common.

Step 3

Exam Tip

सरलतम रूप में सामान्य गुणनखंड नहीं होना चाहिए। दोनों सम होने पर (2) सामान्य है।

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यदि \(\frac{p}{q}\) सरलतम रूप में है और (p,q) दोनों (3) से विभाज्य निकलते हैं तो सही निष्कर्ष क्या है?

If \(\frac{p}{q}\) is in lowest form and both (p,q) turn out divisible by (3), what is the correct conclusion?

Explanation opens after your attempt
Correct Answer

A. भिन्न सरलतम रूप में नहीं रह सकतीThe fraction cannot remain in lowest form

Step 1

Concept

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

Step 2

Why this answer is correct

The correct answer is A. भिन्न सरलतम रूप में नहीं रह सकती / The fraction cannot remain in lowest form. Both have common factor (3). Therefore they cannot remain coprime.

Step 3

Exam Tip

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

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\(\sqrt{2}\) के प्रमाण में \(\sqrt{2}=\frac{m}{n}\) मानने के साथ कौन-सी शर्त जरूरी है?

In the proof of \(\sqrt{2}\), which condition is necessary along with assuming \(\sqrt{2}=\frac{m}{n}\)?

Explanation opens after your attempt
Correct Answer

A. (m,n) सहभाज्य और \(n\neq0\)(m,n) coprime and \(n\neq0\)

Step 1

Concept

A rational number is written in lowest fraction. The denominator is non-zero and numerator-denominator are coprime.

Step 2

Why this answer is correct

The correct answer is A. (m,n) सहभाज्य और \(n\neq0\) / (m,n) coprime and \(n\neq0\). A rational number is written in lowest fraction. The denominator is non-zero and numerator-denominator are coprime.

Step 3

Exam Tip

परिमेय संख्या को सरलतम भिन्न में लिखा जाता है। हर शून्य नहीं होता और अंश-हर सहभाज्य होते हैं।

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\(\sqrt{3}\) के प्रमाण में \(\sqrt{3}=\frac{p}{q}\) मानने पर वर्ग करने से पहले कौन-सी बात माननी चाहिए?

In the proof of \(\sqrt{3}\), after assuming \(\sqrt{3}=\frac{p}{q}\), what should be assumed before squaring?

Explanation opens after your attempt
Correct Answer

B. (p) और (q) सहभाज्य हैं और \(q\neq0\)(p) and (q) are coprime and \(q\neq0\)

Step 1

Concept

The rational form is taken in lowest form. So (p) and (q) are coprime and \(q\neq0\).

Step 2

Why this answer is correct

The correct answer is B. (p) और (q) सहभाज्य हैं और \(q\neq0\) / (p) and (q) are coprime and \(q\neq0\). The rational form is taken in lowest form. So (p) and (q) are coprime and \(q\neq0\).

Step 3

Exam Tip

परिमेय रूप को सरलतम रूप में लिया जाता है। इसलिए (p) और (q) सहभाज्य तथा \(q\neq0\) होते हैं।

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कौन-सा विकल्प \(\sqrt{2}\) के प्रमाण में \(m^2\) से (m) तक सही तर्क बताता है?

Which option gives the correct reasoning from \(m^2\) to (m) in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

The square of an odd integer is odd. Therefore if the square is even, the integer is even.

Step 2

Why this answer is correct

The correct answer is A. यदि \(m^2\) सम है तो (m) सम है / If \(m^2\) is even then (m) is even. The square of an odd integer is odd. Therefore if the square is even, the integer is even.

Step 3

Exam Tip

विषम पूर्णांक का वर्ग विषम होता है। इसलिए वर्ग सम होने पर पूर्णांक सम होगा।

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कौन-सा विकल्प \(\sqrt{3}\) के प्रमाण में \(p^2\) से (p) तक सही तर्क बताता है?

Which option gives the correct reasoning from \(p^2\) to (p) in the proof 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

Prime factor (3) appears in the square only if it appears in the number. Therefore (p) is divisible by (3).

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). Prime factor (3) appears in the square only if it appears in the number. Therefore (p) is divisible by (3).

Step 3

Exam Tip

अभाज्य गुणनखंड (3) वर्ग में तभी आता है जब संख्या में (3) हो। इसलिए (p) (3) से विभाज्य है।

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\(\sqrt{2}\) की अपरिमेयता में अंतिम निष्कर्ष किस आधार पर आता है?

On what basis does the final conclusion in irrationality of \(\sqrt{2}\) come?

Explanation opens after your attempt
Correct Answer

A. परिमेय मान्यता से (m) और (n) दोनों सम निकलते हैंRational assumption makes both (m) and (n) even

Step 1

Concept

Both being even contradicts the coprime condition of lowest fraction. Therefore \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

The correct answer is A. परिमेय मान्यता से (m) और (n) दोनों सम निकलते हैं / Rational assumption makes both (m) and (n) even. Both being even contradicts the coprime condition of lowest fraction. Therefore \(\sqrt{2}\) is irrational.

Step 3

Exam Tip

दोनों सम होना सरलतम भिन्न की सहभाज्य शर्त से विरोधाभास है। इसलिए \(\sqrt{2}\) अपरिमेय है।

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\(\sqrt{3}\) की अपरिमेयता में अंतिम निष्कर्ष किस आधार पर आता है?

On what basis does the final conclusion in irrationality of \(\sqrt{3}\) come?

Explanation opens after your attempt
Correct Answer

B. परिमेय मान्यता से (p) और (q) दोनों (3) से विभाज्य निकलते हैंRational assumption makes both (p) and (q) divisible by (3)

Step 1

Concept

Both being divisible by (3) breaks the coprime condition. Therefore \(\sqrt{3}\) cannot be rational.

Step 2

Why this answer is correct

The correct answer is B. परिमेय मान्यता से (p) और (q) दोनों (3) से विभाज्य निकलते हैं / Rational assumption makes both (p) and (q) divisible by (3). Both being divisible by (3) breaks the coprime condition. Therefore \(\sqrt{3}\) cannot be rational.

Step 3

Exam Tip

दोनों का (3) से विभाज्य होना सहभाज्य शर्त को तोड़ता है। इसलिए \(\sqrt{3}\) परिमेय नहीं हो सकता।

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\(\sqrt{2}\) के प्रमाण में यदि कोई छात्र \(m^2=2n^2\) से सीधे (n) सम लिखता है तो सही टिप्पणी क्या होगी?

In the proof of \(\sqrt{2}\), if a student writes directly from \(m^2=2n^2\) that (n) is even, what is the correct comment?

Explanation opens after your attempt
Correct Answer

B. यह अधूरा है क्योंकि पहले (m) सम सिद्ध करना होगाIt is incomplete because (m) must be proved even first

Step 1

Concept

From \(m^2=2n^2\), first \(m^2\) and then (m) are even. Only after taking (m=2r), (n) is proved even.

Step 2

Why this answer is correct

The correct answer is B. यह अधूरा है क्योंकि पहले (m) सम सिद्ध करना होगा / It is incomplete because (m) must be proved even first. From \(m^2=2n^2\), first \(m^2\) and then (m) are even. Only after taking (m=2r), (n) is proved even.

Step 3

Exam Tip

\(m^2=2n^2\) से पहले \(m^2\) सम और फिर (m) सम मिलता है। (m=2r) रखने के बाद ही (n) सम सिद्ध होता है।

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\(\sqrt{3}\) के प्रमाण में यदि कोई छात्र \(p^2=3q^2\) से सीधे (q) (3) से विभाज्य लिखता है तो सही टिप्पणी क्या है?

In the proof of \(\sqrt{3}\), if a student directly writes from \(p^2=3q^2\) that (q) is divisible by (3), what is the correct comment?

Explanation opens after your attempt
Correct Answer

A. यह अधूरा है क्योंकि पहले (p) (3) से विभाज्य सिद्ध करना होगाIt is incomplete because (p) must be proved divisible by (3) first

Step 1

Concept

First (p) is proved divisible by (3) from \(p^2\). Then after putting (p=3k), the conclusion for (q) follows.

Step 2

Why this answer is correct

The correct answer is A. यह अधूरा है क्योंकि पहले (p) (3) से विभाज्य सिद्ध करना होगा / It is incomplete because (p) must be proved divisible by (3) first. First (p) is proved divisible by (3) from \(p^2\). Then after putting (p=3k), the conclusion for (q) follows.

Step 3

Exam Tip

पहले \(p^2\) से (p) का (3) से विभाज्य होना सिद्ध होता है। फिर (p=3k) रखकर (q) के लिए निष्कर्ष आता है।

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

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

Explanation opens after your attempt
Correct Answer

A. दोनों में पहले परिमेय मानकर सरलतम भिन्न ली जाती हैIn both, a lowest fraction is taken after assuming rationality

Step 1

Concept

Both proofs start with contradiction method. A coprime fraction is assumed rational and leads to contradiction.

Step 2

Why this answer is correct

The correct answer is A. दोनों में पहले परिमेय मानकर सरलतम भिन्न ली जाती है / In both, a lowest fraction is taken after assuming rationality. Both proofs start with contradiction method. A coprime fraction is assumed rational and leads to contradiction.

Step 3

Exam Tip

दोनों प्रमाण विरोधाभास विधि से शुरू होते हैं। परिमेय मानकर सहभाज्य भिन्न से विरोधाभास मिलता है।

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\(\sqrt{2}\) और \(\sqrt{3}\) के प्रमाणों में मुख्य अंतर कौन-सा है?

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

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\) में (2) से समता और \(\sqrt{3}\) में (3) से विभाज्यता आती है\(\sqrt{2}\) uses evenness by (2) and \(\sqrt{3}\) uses divisibility by (3)

Step 1

Concept

In the proof of \(\sqrt{2}\), (2) is central and in the proof of \(\sqrt{3}\), (3) is central. This is the key difference.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\) में (2) से समता और \(\sqrt{3}\) में (3) से विभाज्यता आती है / \(\sqrt{2}\) uses evenness by (2) and \(\sqrt{3}\) uses divisibility by (3). In the proof of \(\sqrt{2}\), (2) is central and in the proof of \(\sqrt{3}\), (3) is central. This is the key difference.

Step 3

Exam Tip

\(\sqrt{2}\) के प्रमाण में (2) मुख्य है और \(\sqrt{3}\) के प्रमाण में (3) मुख्य है। यही मूल अंतर है।

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\(\sqrt{2}\) को अपरिमेय सिद्ध करने में (m,n) सहभाज्य मानने का विरोधाभास किससे बनता है?

In proving \(\sqrt{2}\) irrational, what creates the contradiction to assuming (m,n) coprime?

Explanation opens after your attempt
Correct Answer

A. दोनों का (2) से विभाज्य होनाBoth being divisible by (2)

Step 1

Concept

A common factor (2) is found in both. Therefore they cannot remain coprime.

Step 2

Why this answer is correct

The correct answer is A. दोनों का (2) से विभाज्य होना / Both being divisible by (2). A common factor (2) is found in both. Therefore they cannot remain coprime.

Step 3

Exam Tip

दोनों में (2) सामान्य गुणनखंड मिल जाता है। इसलिए वे सहभाज्य नहीं रह सकते।

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\(\sqrt{3}\) को अपरिमेय सिद्ध करने में (p,q) सहभाज्य मानने का विरोधाभास किससे बनता है?

In proving \(\sqrt{3}\) irrational, what creates the contradiction to assuming (p,q) coprime?

Explanation opens after your attempt
Correct Answer

B. दोनों का (3) से विभाज्य होनाBoth being divisible by (3)

Step 1

Concept

A common factor (3) is found in both. This breaks the coprime condition.

Step 2

Why this answer is correct

The correct answer is B. दोनों का (3) से विभाज्य होना / Both being divisible by (3). A common factor (3) is found in both. This breaks the coprime condition.

Step 3

Exam Tip

दोनों में (3) सामान्य गुणनखंड मिलता है। यह सहभाज्य होने की शर्त को तोड़ता है।

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किस विकल्प में \(\sqrt{2}\) के प्रमाण में प्रयुक्त सही वर्ग संबंध है?

Which option gives the correct squared relation used in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. यदि \(\sqrt{2}=\frac{m}{n}\) तो \(m^2=2n^2\)If \(\sqrt{2}=\frac{m}{n}\), then \(m^2=2n^2\)

Step 1

Concept

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

Step 2

Why this answer is correct

The correct answer is A. यदि \(\sqrt{2}=\frac{m}{n}\) तो \(m^2=2n^2\) / If \(\sqrt{2}=\frac{m}{n}\), then \(m^2=2n^2\). Squaring gives \(2=\frac{m^2}{n^2}\). Hence \(m^2=2n^2\).

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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किस विकल्प में \(\sqrt{3}\) के प्रमाण में प्रयुक्त सही वर्ग संबंध है?

Which option gives the correct squared relation used in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

B. यदि \(\sqrt{3}=\frac{p}{q}\) तो \(p^2=3q^2\)If \(\sqrt{3}=\frac{p}{q}\), then \(p^2=3q^2\)

Step 1

Concept

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

Step 2

Why this answer is correct

The correct answer is B. यदि \(\sqrt{3}=\frac{p}{q}\) तो \(p^2=3q^2\) / If \(\sqrt{3}=\frac{p}{q}\), then \(p^2=3q^2\). Squaring gives \(3=\frac{p^2}{q^2}\). Therefore \(p^2=3q^2\) is correct.

Step 3

Exam Tip

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

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यदि \(\sqrt{2}\) को परिमेय मानने से विरोधाभास मिलता है तो कौन-सा निष्कर्ष सही है?

If assuming \(\sqrt{2}\) rational gives a contradiction, which conclusion is correct?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

A contradiction proves the assumption false. Therefore \(\sqrt{2}\) is not rational but irrational.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\) अपरिमेय है / \(\sqrt{2}\) is irrational. A contradiction proves the assumption false. Therefore \(\sqrt{2}\) is not rational but irrational.

Step 3

Exam Tip

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

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यदि \(\sqrt{3}\) को परिमेय मानने से सहभाज्य शर्त टूटती है तो कौन-सा निष्कर्ष सही है?

If assuming \(\sqrt{3}\) rational breaks the coprime condition, which conclusion is correct?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Breaking the coprime condition is a contradiction to the rational assumption. Therefore \(\sqrt{3}\) is irrational.

Step 2

Why this answer is correct

The correct answer is B. \(\sqrt{3}\) अपरिमेय है / \(\sqrt{3}\) is irrational. Breaking the coprime condition is a contradiction to the rational assumption. Therefore \(\sqrt{3}\) is irrational.

Step 3

Exam Tip

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

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\(\sqrt{2}\) के प्रमाण में \(n\neq0\) की शर्त किसलिए जरूरी है?

Why is the condition \(n\neq0\) necessary in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. क्योंकि हर शून्य होने पर भिन्न परिभाषित नहीं होतीBecause a fraction is undefined when denominator is zero

Step 1

Concept

In rational form \(\frac{m}{n}\), denominator cannot be zero. This is a basic fraction rule.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि हर शून्य होने पर भिन्न परिभाषित नहीं होती / Because a fraction is undefined when denominator is zero. In rational form \(\frac{m}{n}\), denominator cannot be zero. This is a basic fraction rule.

Step 3

Exam Tip

परिमेय रूप \(\frac{m}{n}\) में हर शून्य नहीं हो सकता। यह मूल भिन्न नियम है।

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\(\sqrt{3}\) के प्रमाण में \(q\neq0\) का महत्व क्या है?

What is the importance of \(q\neq0\) in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. यह भिन्न \(\frac{p}{q}\) को परिभाषित रखता हैIt keeps the fraction \(\frac{p}{q}\) defined

Step 1

Concept

If (q=0), \(\frac{p}{q}\) is undefined. Therefore \(q\neq0\) is necessary in rational form.

Step 2

Why this answer is correct

The correct answer is A. यह भिन्न \(\frac{p}{q}\) को परिभाषित रखता है / It keeps the fraction \(\frac{p}{q}\) defined. If (q=0), \(\frac{p}{q}\) is undefined. Therefore \(q\neq0\) is necessary in rational form.

Step 3

Exam Tip

यदि (q=0) हो तो \(\frac{p}{q}\) परिभाषित नहीं है। इसलिए परिमेय रूप में \(q\neq0\) जरूरी है।

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किस विकल्प में \(\sqrt{2}\) के प्रमाण में गलत शुरुआत है?

Which option is a wrong start in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

C. \(\sqrt{2}=\frac{m}{0}\) माननाAssuming \(\sqrt{2}=\frac{m}{0}\)

Step 1

Concept

A fraction is undefined if the denominator is zero. Therefore \(\frac{m}{0}\) is a wrong start.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{2}=\frac{m}{0}\) मानना / Assuming \(\sqrt{2}=\frac{m}{0}\). A fraction is undefined if the denominator is zero. Therefore \(\frac{m}{0}\) is a wrong start.

Step 3

Exam Tip

हर शून्य होने पर भिन्न परिभाषित नहीं होती। इसलिए \(\frac{m}{0}\) गलत शुरुआत है।

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किस विकल्प में \(\sqrt{3}\) के प्रमाण में गलत शुरुआत है?

Which option is a wrong start in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

C. \(\sqrt{3}=\frac{p}{0}\) माननाAssuming \(\sqrt{3}=\frac{p}{0}\)

Step 1

Concept

\(\frac{p}{0}\) is not defined. In rational form, the denominator cannot be zero.

Step 2

Why this answer is correct

The correct answer is C. \(\sqrt{3}=\frac{p}{0}\) मानना / Assuming \(\sqrt{3}=\frac{p}{0}\). \(\frac{p}{0}\) is not defined. In rational form, the denominator cannot be zero.

Step 3

Exam Tip

\(\frac{p}{0}\) परिभाषित नहीं होता। परिमेय रूप में हर शून्य नहीं हो सकता।

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\(\sqrt{2}\) के प्रमाण में किस कथन से (m) सम सिद्ध होता है?

Which statement proves (m) even in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(m^2=2n^2\) और \(m^2\) सम है\(m^2=2n^2\) and \(m^2\) is even

Step 1

Concept

From \(m^2=2n^2\), \(m^2\) is even. Therefore (m) is also even.

Step 2

Why this answer is correct

The correct answer is A. \(m^2=2n^2\) और \(m^2\) सम है / \(m^2=2n^2\) and \(m^2\) is even. From \(m^2=2n^2\), \(m^2\) is even. Therefore (m) is also even.

Step 3

Exam Tip

\(m^2=2n^2\) से \(m^2\) सम है। इसलिए (m) भी सम होगा।

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\(\sqrt{3}\) के प्रमाण में किस कथन से (p) (3) से विभाज्य सिद्ध होता है?

Which statement proves (p) divisible by (3) in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

C. \(p^2=3q^2\) और \(p^2\) (3) से विभाज्य है\(p^2=3q^2\) and \(p^2\) is divisible by (3)

Step 1

Concept

From \(p^2=3q^2\), \(p^2\) is divisible by (3). Therefore (p) is also divisible by (3).

Step 2

Why this answer is correct

The correct answer is C. \(p^2=3q^2\) और \(p^2\) (3) से विभाज्य है / \(p^2=3q^2\) and \(p^2\) is divisible by (3). From \(p^2=3q^2\), \(p^2\) is divisible by (3). Therefore (p) is also divisible by (3).

Step 3

Exam Tip

\(p^2=3q^2\) से \(p^2\) (3) से विभाज्य है। इसलिए (p) भी (3) से विभाज्य होगा।

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\(\sqrt{2}\) के प्रमाण में (m) और (n) दोनों सम होने पर महत्तम समापवर्तक के बारे में क्या कहा जा सकता है?

In the proof of \(\sqrt{2}\), if both (m) and (n) are even, what can be said about their highest common factor?

Explanation opens after your attempt
Correct Answer

B. महत्तम समापवर्तक कम से कम (2) होगाHighest common factor will be at least (2)

Step 1

Concept

If both are even, both are divisible by (2). So the highest common factor cannot be (1).

Step 2

Why this answer is correct

The correct answer is B. महत्तम समापवर्तक कम से कम (2) होगा / Highest common factor will be at least (2). If both are even, both are divisible by (2). So the highest common factor cannot be (1).

Step 3

Exam Tip

दोनों सम होने पर दोनों (2) से विभाज्य हैं। इसलिए महत्तम समापवर्तक (1) नहीं हो सकता।

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\(\sqrt{3}\) के प्रमाण में (p) और (q) दोनों (3) से विभाज्य होने पर महत्तम समापवर्तक के बारे में क्या सही है?

In the proof of \(\sqrt{3}\), if both (p) and (q) are divisible by (3), what is correct about their highest common factor?

Explanation opens after your attempt
Correct Answer

A. वह कम से कम (3) होगाIt will be at least (3)

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. वह कम से कम (3) होगा / It will be at least (3). 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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\(\sqrt{2}\) के प्रमाण में यदि (m) विषम माना जाए तो \(m^2=2n^2\) से क्या समस्या बनेगी?

In the proof of \(\sqrt{2}\), if (m) is assumed odd, what problem arises from \(m^2=2n^2\)?

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Correct Answer

A. \(m^2\) विषम होना चाहिए लेकिन समीकरण से सम मिलता है\(m^2\) should be odd but the equation gives even

Step 1

Concept

The square of an odd number is odd. But \(m^2=2n^2\) makes \(m^2\) even, so (m) cannot be odd.

Step 2

Why this answer is correct

The correct answer is A. \(m^2\) विषम होना चाहिए लेकिन समीकरण से सम मिलता है / \(m^2\) should be odd but the equation gives even. The square of an odd number is odd. But \(m^2=2n^2\) makes \(m^2\) even, so (m) cannot be odd.

Step 3

Exam Tip

विषम संख्या का वर्ग विषम होता है। लेकिन \(m^2=2n^2\) से \(m^2\) सम है, इसलिए (m) विषम नहीं हो सकता।

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\(\sqrt{3}\) के प्रमाण में यदि (p) (3) से विभाज्य न हो तो \(p^2=3q^2\) से क्या समस्या होगी?

In the proof of \(\sqrt{3}\), if (p) is not divisible by (3), what problem arises from \(p^2=3q^2\)?

Explanation opens after your attempt
Correct Answer

A. \(p^2\) (3) से विभाज्य नहीं होना चाहिए लेकिन समीकरण से विभाज्य है\(p^2\) should not be divisible by (3), but the equation makes it divisible

Step 1

Concept

If (p) has no factor (3), then \(p^2\) also has none. But \(p^2=3q^2\) shows it divisible by (3).

Step 2

Why this answer is correct

The correct answer is A. \(p^2\) (3) से विभाज्य नहीं होना चाहिए लेकिन समीकरण से विभाज्य है / \(p^2\) should not be divisible by (3), but the equation makes it divisible. If (p) has no factor (3), then \(p^2\) also has none. But \(p^2=3q^2\) shows it divisible by (3).

Step 3

Exam Tip

यदि (p) में (3) का गुणनखंड नहीं है तो \(p^2\) में भी नहीं होगा। लेकिन \(p^2=3q^2\) उसे (3) से विभाज्य दिखाता है।

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किस विकल्प में \(\sqrt{2}\) के प्रमाण में सही अंतिम वाक्य है?

Which option gives the correct final sentence in the proof of \(\sqrt{2}\)?

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Correct Answer

B. अतः हमारी परिमेय मान्यता गलत है और \(\sqrt{2}\) अपरिमेय हैTherefore our rational assumption is false and \(\sqrt{2}\) is irrational

Step 1

Concept

When contradiction is found, the initial rational assumption is false. So the final conclusion is irrationality.

Step 2

Why this answer is correct

The correct answer is B. अतः हमारी परिमेय मान्यता गलत है और \(\sqrt{2}\) अपरिमेय है / Therefore our rational assumption is false and \(\sqrt{2}\) is irrational. When contradiction is found, the initial rational assumption is false. So the final conclusion is irrationality.

Step 3

Exam Tip

विरोधाभास मिलने पर प्रारंभिक परिमेय मान्यता गलत होती है। इसलिए अंतिम निष्कर्ष अपरिमेयता है।

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किस विकल्प में \(\sqrt{3}\) के प्रमाण में सही अंतिम वाक्य है?

Which option gives the correct final sentence in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. अतः \(\sqrt{3}\) अपरिमेय हैTherefore \(\sqrt{3}\) is irrational

Step 1

Concept

The rational assumption makes both (p) and (q) divisible by (3). This contradiction proves \(\sqrt{3}\) irrational.

Step 2

Why this answer is correct

The correct answer is A. अतः \(\sqrt{3}\) अपरिमेय है / Therefore \(\sqrt{3}\) is irrational. The rational assumption makes both (p) and (q) divisible by (3). This contradiction proves \(\sqrt{3}\) irrational.

Step 3

Exam Tip

परिमेय मान्यता से (p) और (q) दोनों (3) से विभाज्य निकलते हैं। यह विरोधाभास \(\sqrt{3}\) को अपरिमेय सिद्ध करता है।

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\(\sqrt{2}\) और \(\sqrt{3}\) के प्रमाण में कौन-सी विधि उपयुक्त है और क्यों?

Which method is suitable for the proofs of \(\sqrt{2}\) and \(\sqrt{3}\) and why?

Explanation opens after your attempt
Correct Answer

A. विरोधाभास विधि क्योंकि परिमेय मान्यता से असंभव स्थिति मिलती हैContradiction method because rational assumption gives an impossible situation

Step 1

Concept

In both proofs, the opposite is assumed and contradiction with coprime condition is derived. Hence contradiction method is correct.

Step 2

Why this answer is correct

The correct answer is A. विरोधाभास विधि क्योंकि परिमेय मान्यता से असंभव स्थिति मिलती है / Contradiction method because rational assumption gives an impossible situation. In both proofs, the opposite is assumed and contradiction with coprime condition is derived. Hence contradiction method is correct.

Step 3

Exam Tip

दोनों प्रमाणों में उल्टा मानकर सहभाज्य शर्त से विरोधाभास निकाला जाता है। इसलिए विरोधाभास विधि सही है।

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यदि \(\sqrt{2}\) की परिमेय मान्यता सही होती तो \(\frac{m}{n}\) कैसा होना चाहिए था?

If the rational assumption for \(\sqrt{2}\) were correct, what should \(\frac{m}{n}\) be like?

Explanation opens after your attempt
Correct Answer

A. सरलतम रूप में सहभाज्य अंश-हर वालाIn lowest form with coprime numerator and denominator

Step 1

Concept

A rational number can be written in lowest fractional form. This assumption is later contradicted.

Step 2

Why this answer is correct

The correct answer is A. सरलतम रूप में सहभाज्य अंश-हर वाला / In lowest form with coprime numerator and denominator. A rational number can be written in lowest fractional form. This assumption is later contradicted.

Step 3

Exam Tip

परिमेय संख्या को सरलतम भिन्न में लिखा जा सकता है। यही मान्यता बाद में टूटती है।

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यदि \(\sqrt{3}\) की परिमेय मान्यता सही होती तो \(\frac{p}{q}\) में कौन-सी बात नहीं हो सकती थी?

If the rational assumption for \(\sqrt{3}\) were correct, what could not happen in \(\frac{p}{q}\)?

Explanation opens after your attempt
Correct Answer

A. (p) और (q) दोनों का (3) से विभाज्य होनाBoth (p) and (q) being divisible by (3)

Step 1

Concept

In lowest form (p) and (q) are coprime. If both are divisible by (3), this is impossible.

Step 2

Why this answer is correct

The correct answer is A. (p) और (q) दोनों का (3) से विभाज्य होना / Both (p) and (q) being divisible by (3). In lowest form (p) and (q) are coprime. If both are divisible by (3), this is impossible.

Step 3

Exam Tip

सरलतम रूप में (p) और (q) सहभाज्य होते हैं। दोनों (3) से विभाज्य हों तो यह संभव नहीं है।

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\(\sqrt{2}\) के प्रमाण में \(m^2=2n^2\) के बाद (m=2r) लिखकर कौन-सा विरोधाभास तैयार होता है?

In the proof of \(\sqrt{2}\), after \(m^2=2n^2\), what contradiction is prepared by writing (m=2r)?

Explanation opens after your attempt
Correct Answer

A. (n) भी सम निकलता है(n) also becomes even

Step 1

Concept

Putting (m=2r) gives \(n^2=2r^2\). This makes (n) even too and creates the contradiction of both even.

Step 2

Why this answer is correct

The correct answer is A. (n) भी सम निकलता है / (n) also becomes even. Putting (m=2r) gives \(n^2=2r^2\). This makes (n) even too and creates the contradiction of both even.

Step 3

Exam Tip

(m=2r) रखने से \(n^2=2r^2\) मिलता है। इससे (n) भी सम होता है और दोनों सम का विरोधाभास बनता है।

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\(\sqrt{3}\) के प्रमाण में (p=3k) लिखकर कौन-सा विरोधाभास तैयार होता है?

In the proof of \(\sqrt{3}\), what contradiction is prepared by writing (p=3k)?

Explanation opens after your attempt
Correct Answer

A. (q) भी (3) से विभाज्य निकलता है(q) also becomes divisible by (3)

Step 1

Concept

Putting (p=3k) gives \(q^2=3k^2\). This makes (q) also divisible by (3).

Step 2

Why this answer is correct

The correct answer is A. (q) भी (3) से विभाज्य निकलता है / (q) also becomes divisible by (3). Putting (p=3k) gives \(q^2=3k^2\). This makes (q) also divisible by (3).

Step 3

Exam Tip

(p=3k) रखने से \(q^2=3k^2\) मिलता है। इससे (q) भी (3) से विभाज्य होता है।

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किस विकल्प में \(\sqrt{2}\) के प्रमाण में उपयोगी सही नियम है?

Which option gives a useful correct rule in the proof of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. वर्ग सम हो तो संख्या सम होती हैIf the square is even, the number is even

Step 1

Concept

This rule is used to prove (m) even from \(m^2\). Write it clearly in the proof.

Step 2

Why this answer is correct

The correct answer is A. वर्ग सम हो तो संख्या सम होती है / If the square is even, the number is even. This rule is used to prove (m) even from \(m^2\). Write it clearly in the proof.

Step 3

Exam Tip

यह नियम \(m^2\) से (m) सम सिद्ध करने में काम आता है। इसे प्रमाण में स्पष्ट लिखें।

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किस विकल्प में \(\sqrt{3}\) के प्रमाण में उपयोगी सही नियम है?

Which option gives a useful correct rule in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. यदि (3) वर्ग को विभाजित करे तो संख्या को भी विभाजित करता हैIf (3) divides the square, it also divides the number

Step 1

Concept

Since (3) is prime, this rule applies. It shows (p) and later (q) divisible by (3).

Step 2

Why this answer is correct

The correct answer is A. यदि (3) वर्ग को विभाजित करे तो संख्या को भी विभाजित करता है / If (3) divides the square, it also divides the number. Since (3) is prime, this rule applies. It shows (p) and later (q) divisible by (3).

Step 3

Exam Tip

(3) अभाज्य है इसलिए यह नियम लागू होता है। इसी से (p) और बाद में (q) (3) से विभाज्य मिलते हैं।

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\(\sqrt{2}\) और \(\sqrt{3}\) दोनों के प्रमाणों का सही संयुक्त निष्कर्ष कौन-सा है?

What is the correct combined conclusion of the proofs of both \(\sqrt{2}\) and \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. दोनों को परिमेय मानने पर विरोधाभास मिलता है इसलिए दोनों अपरिमेय हैंAssuming either rational gives contradiction, so both are irrational

Step 1

Concept

In both proofs, the rational assumption clashes with the coprime condition. Therefore both \(\sqrt{2}\) and \(\sqrt{3}\) are irrational.

Step 2

Why this answer is correct

The correct answer is A. दोनों को परिमेय मानने पर विरोधाभास मिलता है इसलिए दोनों अपरिमेय हैं / Assuming either rational gives contradiction, so both are irrational. In both proofs, the rational assumption clashes with the coprime condition. Therefore both \(\sqrt{2}\) and \(\sqrt{3}\) are irrational.

Step 3

Exam Tip

दोनों प्रमाणों में परिमेय मान्यता सहभाज्य शर्त से टकराती है। इसलिए \(\sqrt{2}\) और \(\sqrt{3}\) दोनों अपरिमेय हैं।

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