Concept-wise Practice

irrational-numbers MCQ Questions for Class 10

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Practice Questions

168 questions tagged with irrational-numbers.

कौन सा विकल्प दो अपरिमेय संख्याओं का गुणनफल अपरिमेय बनने का उदाहरण है?

Which option is an example where the product of two irrational numbers is irrational?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\times\sqrt{5}\)

Step 1

Concept

\(\sqrt{2}\times\sqrt{5}=\sqrt{10}\), which is irrational. Multiplying equal roots can often give a rational number.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\times\sqrt{5}\). \(\sqrt{2}\times\sqrt{5}=\sqrt{10}\), which is irrational. Multiplying equal roots can often give a rational number.

Step 3

Exam Tip

\(\sqrt{2}\times\sqrt{5}=\sqrt{10}\) है जो अपरिमेय है। समान जड़ों का गुणन अक्सर परिमेय दे सकता है।

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कौन सा विकल्प दो अपरिमेय संख्याओं का योग परिमेय बनने का उदाहरण है?

Which option is an example where the sum of two irrational numbers is rational?

Explanation opens after your attempt
Correct Answer

A. (\sqrt{5}+\(-\sqrt{5}\))

Step 1

Concept

(\sqrt{5}+\(-\sqrt{5}\)=0), which is rational. This shows the sum is not always irrational.

Step 2

Why this answer is correct

The correct answer is A. (\sqrt{5}+\(-\sqrt{5}\)). (\sqrt{5}+\(-\sqrt{5}\)=0), which is rational. This shows the sum is not always irrational.

Step 3

Exam Tip

(\sqrt{5}+\(-\sqrt{5}\)=0) है जो परिमेय है। इससे पता चलता है कि योग हमेशा अपरिमेय नहीं होता।

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\(\frac{3}{\sqrt{3}}\) का सरल मान क्या है?

What is the simplified value of \(\frac{3}{\sqrt{3}}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}\)

Step 1

Concept

\(\frac{3}{\sqrt{3}}=\sqrt{3}\) because \(3=\sqrt{3}\times\sqrt{3}\). Practice simplifying denominators with roots.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{3}\). \(\frac{3}{\sqrt{3}}=\sqrt{3}\) because \(3=\sqrt{3}\times\sqrt{3}\). Practice simplifying denominators with roots.

Step 3

Exam Tip

\(\frac{3}{\sqrt{3}}=\sqrt{3}\) क्योंकि \(3=\sqrt{3}\times\sqrt{3}\)। जड़ वाले हर को सरल करने का अभ्यास करें।

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\(\sqrt{3}\times\sqrt{27}\) का मान क्या है?

What is the value of \(\sqrt{3}\times\sqrt{27}\)?

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Correct Answer

A. (9)

Step 1

Concept

\(\sqrt{3}\times\sqrt{27}=\sqrt{81}=9\). The product of two irrational numbers can be rational.

Step 2

Why this answer is correct

The correct answer is A. (9). \(\sqrt{3}\times\sqrt{27}=\sqrt{81}=9\). The product of two irrational numbers can be rational.

Step 3

Exam Tip

\(\sqrt{3}\times\sqrt{27}=\sqrt{81}=9\) है। दो अपरिमेय संख्याओं का गुणनफल परिमेय भी हो सकता है।

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\(10-\sqrt{6}\) किस प्रकार की संख्या है?

What type of number is \(10-\sqrt{6}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

Subtracting an irrational number from a rational number gives an irrational result. \(\sqrt{6}\) is irrational because (6) is not a perfect square.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. Subtracting an irrational number from a rational number gives an irrational result. \(\sqrt{6}\) is irrational because (6) is not a perfect square.

Step 3

Exam Tip

परिमेय से अपरिमेय घटाने पर परिणाम अपरिमेय होता है। \(\sqrt{6}\) अपरिमेय है क्योंकि (6) पूर्ण वर्ग नहीं है।

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\(6+\sqrt{11}\) किस प्रकार की संख्या है?

What type of number is \(6+\sqrt{11}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

Adding irrational \(\sqrt{11}\) to rational (6) gives an irrational number. Do not mistake the root for a perfect square.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. Adding irrational \(\sqrt{11}\) to rational (6) gives an irrational number. Do not mistake the root for a perfect square.

Step 3

Exam Tip

परिमेय संख्या (6) में अपरिमेय \(\sqrt{11}\) जोड़ने पर परिणाम अपरिमेय रहता है। जड़ को पूर्ण वर्ग समझने की गलती न करें।

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कौन सा विकल्प केवल अपरिमेय संख्याएँ दिखाता है?

Which option shows only irrational numbers?

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Correct Answer

A. \(\sqrt{2}\), \(\sqrt{7}\), \(\pi\)

Step 1

Concept

\(\sqrt{2}\), \(\sqrt{7}\), and \(\pi\) are all irrational. Identify square roots of perfect squares and fractions separately.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\), \(\sqrt{7}\), \(\pi\). \(\sqrt{2}\), \(\sqrt{7}\), and \(\pi\) are all irrational. Identify square roots of perfect squares and fractions separately.

Step 3

Exam Tip

\(\sqrt{2}\), \(\sqrt{7}\) और \(\pi\) सभी अपरिमेय हैं। पूर्ण वर्ग की जड़ और भिन्न को अलग पहचानें।

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दशमलव (5.123123312333...) में कोई निश्चित आवर्तन नहीं है। यह कैसी संख्या है?

The decimal (5.123123312333...) has no fixed repetition. What type of number is it?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

A non terminating and non recurring decimal is irrational. Do not decide only by seeing it is infinite.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. A non terminating and non recurring decimal is irrational. Do not decide only by seeing it is infinite.

Step 3

Exam Tip

अनंत और अनावर्ती दशमलव अपरिमेय होता है। केवल अनंत देखकर निर्णय न लें।

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कौन सी संख्या अपरिमेय संख्या का उदाहरण है?

Which number is an example of an irrational number?

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Correct Answer

A. \(\sqrt{15}\)

Step 1

Concept

\(\sqrt{15}\) is irrational because (15) is not a perfect square. Identifying perfect squares is very useful in exams.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{15}\). \(\sqrt{15}\) is irrational because (15) is not a perfect square. Identifying perfect squares is very useful in exams.

Step 3

Exam Tip

\(\sqrt{15}\) में (15) पूर्ण वर्ग नहीं है इसलिए यह अपरिमेय है। परीक्षा में पूर्ण वर्ग पहचानना बहुत उपयोगी है।

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यदि \(x=2+\sqrt{5}\) है तो (x-2) किस प्रकार की संख्या है?

If \(x=2+\sqrt{5}\), what type of number is (x-2)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

\(x-2=\sqrt{5}\), which is irrational. In such questions simplify the expression first.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. \(x-2=\sqrt{5}\), which is irrational. In such questions simplify the expression first.

Step 3

Exam Tip

\(x-2=\sqrt{5}\) है जो अपरिमेय है। ऐसे प्रश्नों में पहले अभिव्यक्ति को सरल करें।

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कौन सी संख्या \(\sqrt{50}\) का सही सरल रूप है?

Which number is the correct simplified form of \(\sqrt{50}\)?

Explanation opens after your attempt
Correct Answer

A. \(5\sqrt{2}\)

Step 1

Concept

\(\sqrt{50}=\sqrt{25\times2}=5\sqrt{2}\). Find the greatest perfect square inside the root.

Step 2

Why this answer is correct

The correct answer is A. \(5\sqrt{2}\). \(\sqrt{50}=\sqrt{25\times2}=5\sqrt{2}\). Find the greatest perfect square inside the root.

Step 3

Exam Tip

\(\sqrt{50}=\sqrt{25\times2}=5\sqrt{2}\) है। जड़ के अंदर सबसे बड़ा पूर्ण वर्ग खोजें।

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\(7-\sqrt{2}\) किस प्रकार की संख्या है?

What type of number is \(7-\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

Subtracting irrational \(\sqrt{2}\) from rational (7) gives an irrational number. Changing the sign does not change this property.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. Subtracting irrational \(\sqrt{2}\) from rational (7) gives an irrational number. Changing the sign does not change this property.

Step 3

Exam Tip

परिमेय (7) से अपरिमेय \(\sqrt{2}\) घटाने पर परिणाम अपरिमेय होता है। संकेत बदलने से गुण नहीं बदलता।

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कौन सा विकल्प हमेशा सत्य है?

Which option is always true?

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Correct Answer

A. प्रत्येक अपरिमेय संख्या वास्तविक होती हैEvery irrational number is real

Step 1

Concept

Irrational numbers are a part of real numbers. But all real numbers are not irrational.

Step 2

Why this answer is correct

The correct answer is A. प्रत्येक अपरिमेय संख्या वास्तविक होती है / Every irrational number is real. Irrational numbers are a part of real numbers. But all real numbers are not irrational.

Step 3

Exam Tip

अपरिमेय संख्याएँ वास्तविक संख्याओं का भाग हैं। लेकिन सभी वास्तविक संख्याएँ अपरिमेय नहीं होतीं।

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कौन सी संख्या \(\frac{p}{q}\) रूप में नहीं लिखी जा सकती जहाँ (p) और (q) पूर्णांक हैं तथा \(q\neq0\)?

Which number cannot be written in the form \(\frac{p}{q}\) where (p) and (q) are integers and \(q\neq0\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{6}\)

Step 1

Concept

\(\sqrt{6}\) is irrational so it cannot be written as \(\frac{p}{q}\). The other numbers are rational.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{6}\). \(\sqrt{6}\) is irrational so it cannot be written as \(\frac{p}{q}\). The other numbers are rational.

Step 3

Exam Tip

\(\sqrt{6}\) अपरिमेय है इसलिए इसे \(\frac{p}{q}\) रूप में नहीं लिख सकते। बाकी संख्याएँ परिमेय हैं।

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यदि \(x=\sqrt{3}\) है तो \(x^2\) किस प्रकार की संख्या है?

If \(x=\sqrt{3}\), what type of number is \(x^2\)?

Explanation opens after your attempt
Correct Answer

A. परिमेय संख्याRational number

Step 1

Concept

(\(\sqrt{3}\)2=3) which is rational. The square of an irrational number can sometimes be rational.

Step 2

Why this answer is correct

The correct answer is A. परिमेय संख्या / Rational number. (\(\sqrt{3}\)2=3) which is rational. The square of an irrational number can sometimes be rational.

Step 3

Exam Tip

(\(\sqrt{3}\)2=3) है जो परिमेय है। अपरिमेय संख्या का वर्ग कभी-कभी परिमेय हो सकता है।

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\(\sqrt{2}\) और \(\sqrt{8}\) के बारे में सही संबंध क्या है?

What is the correct relation between \(\sqrt{2}\) and \(\sqrt{8}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{8}=2\sqrt{2}\)

Step 1

Concept

\(\sqrt{8}=\sqrt{4\times2}=2\sqrt{2}\). Take the square factor outside.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{8}=2\sqrt{2}\). \(\sqrt{8}=\sqrt{4\times2}=2\sqrt{2}\). Take the square factor outside.

Step 3

Exam Tip

\(\sqrt{8}=\sqrt{4\times2}=2\sqrt{2}\) है। वर्ग गुणनखंड को बाहर निकालें।

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दो अपरिमेय संख्याओं का गुणनफल हमेशा कैसा होता है?

What is the product of two irrational numbers always?

Explanation opens after your attempt
Correct Answer

A. हमेशा निश्चित नहींNot always fixed

Step 1

Concept

\(\sqrt{2}\times\sqrt{2}=2\) is rational but \(\sqrt{2}\times\sqrt{3}=\sqrt{6}\) is irrational. So it is not always one type.

Step 2

Why this answer is correct

The correct answer is A. हमेशा निश्चित नहीं / Not always fixed. \(\sqrt{2}\times\sqrt{2}=2\) is rational but \(\sqrt{2}\times\sqrt{3}=\sqrt{6}\) is irrational. So it is not always one type.

Step 3

Exam Tip

\(\sqrt{2}\times\sqrt{2}=2\) परिमेय है लेकिन \(\sqrt{2}\times\sqrt{3}=\sqrt{6}\) अपरिमेय है। इसलिए हमेशा एक जैसा नहीं होता।

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दो अपरिमेय संख्याओं का योग हमेशा कैसा होता है?

What is the sum of two irrational numbers always?

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Correct Answer

A. हमेशा निश्चित नहींNot always fixed

Step 1

Concept

(\sqrt{2}+\(-\sqrt{2}\)=0) is rational but \(\sqrt{2}+\sqrt{3}\) is irrational. So there is no fixed always rule.

Step 2

Why this answer is correct

The correct answer is A. हमेशा निश्चित नहीं / Not always fixed. (\sqrt{2}+\(-\sqrt{2}\)=0) is rational but \(\sqrt{2}+\sqrt{3}\) is irrational. So there is no fixed always rule.

Step 3

Exam Tip

(\sqrt{2}+\(-\sqrt{2}\)=0) परिमेय है लेकिन \(\sqrt{2}+\sqrt{3}\) अपरिमेय है। इसलिए हमेशा एक जैसा नियम नहीं है।

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\(\frac{\sqrt{2}}{2}\) के बारे में सही कथन कौन सा है?

Which statement is correct about \(\frac{\sqrt{2}}{2}\)?

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Correct Answer

A. यह अपरिमेय हैIt is irrational

Step 1

Concept

Dividing \(\sqrt{2}\) by non zero rational (2) keeps it irrational. Check the nature of the root in such expressions.

Step 2

Why this answer is correct

The correct answer is A. यह अपरिमेय है / It is irrational. Dividing \(\sqrt{2}\) by non zero rational (2) keeps it irrational. Check the nature of the root in such expressions.

Step 3

Exam Tip

\(\sqrt{2}\) को गैर शून्य परिमेय (2) से भाग देने पर संख्या अपरिमेय रहती है। ऐसी अभिव्यक्तियों में जड़ की प्रकृति देखें।

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\(3\sqrt{5}\) किस प्रकार की संख्या है?

What type of number is \(3\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

Multiplying an irrational by a non zero rational gives an irrational result. Here \(3\neq0\).

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. Multiplying an irrational by a non zero rational gives an irrational result. Here \(3\neq0\).

Step 3

Exam Tip

गैर शून्य परिमेय संख्या से अपरिमेय को गुणा करने पर परिणाम अपरिमेय होता है। यहाँ \(3\neq0\) है।

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यदि (a) परिमेय है और (b) अपरिमेय है तो (a+b) कब निश्चित रूप से अपरिमेय होगा?

If (a) is rational and (b) is irrational then when is (a+b) definitely irrational?

Explanation opens after your attempt
Correct Answer

A. जब (a) कोई भी परिमेय संख्या होWhen (a) is any rational number

Step 1

Concept

Adding a rational number to an irrational number gives an irrational result. This simple property often appears in MCQs.

Step 2

Why this answer is correct

The correct answer is A. जब (a) कोई भी परिमेय संख्या हो / When (a) is any rational number. Adding a rational number to an irrational number gives an irrational result. This simple property often appears in MCQs.

Step 3

Exam Tip

परिमेय में अपरिमेय जोड़ने पर परिणाम अपरिमेय रहता है। यह आसान गुण अक्सर MCQ में आता है।

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\(\sqrt{2}+\sqrt{2}\) का सरल रूप क्या है?

What is the simplest form of \(\sqrt{2}+\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{2}\)

Step 1

Concept

Adding like terms gives \(2\sqrt{2}\). Writing it as \(\sqrt{4}\) is wrong.

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{2}\). Adding like terms gives \(2\sqrt{2}\). Writing it as \(\sqrt{4}\) is wrong.

Step 3

Exam Tip

समान पदों को जोड़ने पर \(2\sqrt{2}\) मिलता है। इसे \(\sqrt{4}\) लिखना गलत है।

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\(2+\sqrt{3}\) किस प्रकार की संख्या है?

What type of number is \(2+\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

Adding irrational \(\sqrt{3}\) to rational (2) gives an irrational number. Do not treat such sums as rational.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. Adding irrational \(\sqrt{3}\) to rational (2) gives an irrational number. Do not treat such sums as rational.

Step 3

Exam Tip

परिमेय (2) में अपरिमेय \(\sqrt{3}\) जोड़ने पर परिणाम अपरिमेय होता है। परीक्षा में ऐसे योग को परिमेय न मानें।

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\(\pi\) किस प्रकार की संख्या है?

What type of number is \(\pi\)?

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Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

The decimal expansion of \(\pi\) is non terminating and non repeating. So it is irrational.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. The decimal expansion of \(\pi\) is non terminating and non repeating. So it is irrational.

Step 3

Exam Tip

\(\pi\) का दशमलव अनंत और अनावर्ती है। इसलिए यह अपरिमेय संख्या है।

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अपरिमेय संख्या का दशमलव प्रसार कैसा होता है?

What is the decimal expansion of an irrational number like?

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Correct Answer

A. अनंत और अनावर्तीNon terminating and non repeating

Step 1

Concept

The decimal of an irrational number neither ends nor repeats. This is the easiest identification.

Step 2

Why this answer is correct

The correct answer is A. अनंत और अनावर्ती / Non terminating and non repeating. The decimal of an irrational number neither ends nor repeats. This is the easiest identification.

Step 3

Exam Tip

अपरिमेय संख्या का दशमलव न खत्म होता है और न दोहराता है। यही सबसे आसान पहचान है।

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कौन सी संख्या अपरिमेय संख्या है?

Which number is an irrational number?

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Correct Answer

A. \(\sqrt{2}\)

Step 1

Concept

\(\sqrt{2}\) cannot be written as \(\frac{p}{q}\). In exams identify roots of non perfect squares.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\). \(\sqrt{2}\) cannot be written as \(\frac{p}{q}\). In exams identify roots of non perfect squares.

Step 3

Exam Tip

\(\sqrt{2}\) को \(\frac{p}{q}\) के रूप में नहीं लिखा जा सकता। परीक्षा में पूर्ण वर्ग न होने वाली जड़ पहचानें।

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\(0.01001000100001\ldots\) के बारे में सही कथन कौन-सा है?

Which statement is correct about \(0.01001000100001\ldots\)?

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Correct Answer

C. यह असमाप्त अनावर्ती दशमलव हैIt is a non-terminating non-recurring decimal

Step 1

Concept

The given decimal does not end.

Step 2

Why this answer is correct

It has no fixed repeating block.

Step 3

Exam Tip

Such a decimal is called non-terminating non-recurring. चरण 1: दिया गया दशमलव समाप्त नहीं हो रहा है। चरण 2: इसमें कोई निश्चित दोहराने वाला खंड भी नहीं है। चरण 3: ऐसा दशमलव असमाप्त अनावर्ती कहलाता है।

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\(0.101001000100001\ldots\) के बारे में सही कथन चुनिए।

Choose the correct statement about \(0.101001000100001\ldots\).

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Correct Answer

C. यह असमाप्त अनावर्ती दशमलव हैIt is a non-terminating non-recurring decimal

Step 1

Concept

The given decimal does not end.

Step 2

Why this answer is correct

It also has no fixed repeating block.

Step 3

Exam Tip

A non-terminating non-recurring decimal is associated with an irrational number. चरण 1: दिया गया दशमलव समाप्त नहीं हो रहा है। चरण 2: इसमें कोई निश्चित दोहराने वाला खंड भी नहीं है। चरण 3: असमाप्त और अनावर्ती दशमलव अपरिमेय संख्या से जुड़ा होता है।

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यदि (0<a<1) और (a) परिमेय है, तो \(\sqrt{a}\) कब निश्चित रूप से परिमेय होगी?

If (0<a<1) and (a) is rational, when will \(\sqrt{a}\) definitely be rational?

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Correct Answer

A. जब (a) को दो पूर्ण वर्गों के अनुपात के रूप में लिखा जा सकेWhen (a) can be written as a ratio of two perfect squares

Step 1

Concept

The square root of a rational fraction is rational when both numerator and denominator can be perfect squares.

Step 2

Why this answer is correct

For example, \(\sqrt{\frac{4}{9}}=\frac{2}{3}\), so a ratio of two perfect squares is a safe condition.

Step 3

Exam Tip

Being positive or less than (1) does not guarantee a rational square root. चरण 1: किसी परिमेय भिन्न का वर्गमूल परिमेय तब होता है जब अंश और हर दोनों पूर्ण वर्ग बन सकें। चरण 2: जैसे \(\sqrt{\frac{4}{9}}=\frac{2}{3}\), इसलिए दो पूर्ण वर्गों का अनुपात सुरक्षित स्थिति है। चरण 3: केवल धनात्मक या (1) से छोटा होना परिमेय वर्गमूल की गारंटी नहीं देता।

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कौन सी संख्या परिमेय है, जबकि उसमें अपरिमेय वर्गमूल दिखाई दे रहे हैं?

Which number is rational even though irrational square roots appear in it?

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Correct Answer

A. (\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\))

Step 1

Concept

The first option is a product of conjugate terms.

Step 2

Why this answer is correct

(\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\)=6-2=4), which is rational.

Step 3

Exam Tip

Identifying conjugates helps remove radicals quickly. चरण 1: पहला विकल्प संयुग्मी पदों का गुणनफल है। चरण 2: (\(\sqrt{6}+\sqrt{2}\)\(\sqrt{6}-\sqrt{2}\)=6-2=4), जो परिमेय है। चरण 3: संयुग्मी पद पहचानने से वर्गमूल जल्दी हट जाते हैं।

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