Concept-wise Practice

irrational-product MCQ Questions for Class 10

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Practice Questions

15 questions tagged with irrational-product.

किस विकल्प में दो अपरिमेय संख्याओं का गुणनफल परिमेय है?

In which option is the product of two irrational numbers rational?

Explanation opens after your attempt
Correct Answer

A. (\(2+\sqrt{3}\)\(2-\sqrt{3}\))

Step 1

Concept

(\(2+\sqrt{3}\)\(2-\sqrt{3}\)=4-3=1) which is rational. In exams remember conjugate multiplication as a counterexample.

Step 2

Why this answer is correct

The correct answer is A. (\(2+\sqrt{3}\)\(2-\sqrt{3}\)). (\(2+\sqrt{3}\)\(2-\sqrt{3}\)=4-3=1) which is rational. In exams remember conjugate multiplication as a counterexample.

Step 3

Exam Tip

(\(2+\sqrt{3}\)\(2-\sqrt{3}\)=4-3=1) है जो परिमेय है। परीक्षा में संयुग्मी गुणन को प्रतिउदाहरण के रूप में याद रखें।

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किस विकल्प में दो अलग-अलग अपरिमेय संख्याओं का गुणनफल परिमेय है?

In which option is the product of two different irrational numbers rational?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\) और \(3\sqrt{2}\)\(\sqrt{2}\) and \(3\sqrt{2}\)

Step 1

Concept

\(\sqrt{2}\cdot3\sqrt{2}=6\), which is rational. In exams remember counterexamples for products of irrational numbers.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\) और \(3\sqrt{2}\) / \(\sqrt{2}\) and \(3\sqrt{2}\). \(\sqrt{2}\cdot3\sqrt{2}=6\), which is rational. In exams remember counterexamples for products of irrational numbers.

Step 3

Exam Tip

\(\sqrt{2}\cdot3\sqrt{2}=6\), जो परिमेय है। परीक्षा में अपरिमेय संख्याओं के गुणनफल के लिए प्रतिउदाहरण याद रखें।

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यदि (a) परिमेय है और \(a\ne0\), तो \(a\sqrt{5}\) किस प्रकार की संख्या है?

If (a) is rational and \(a\ne0\), what type of number is \(a\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

B. हमेशा अपरिमेयAlways irrational

Step 1

Concept

The product of a non-zero rational number and an irrational number remains irrational. In exams the condition \(a\ne0\) is very important.

Step 2

Why this answer is correct

The correct answer is B. हमेशा अपरिमेय / Always irrational. The product of a non-zero rational number and an irrational number remains irrational. In exams the condition \(a\ne0\) is very important.

Step 3

Exam Tip

अशून्य परिमेय संख्या से अपरिमेय संख्या का गुणन अपरिमेय रहता है। परीक्षा में \(a\ne0\) शर्त बहुत महत्वपूर्ण है।

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कौन सा विकल्प \(\sqrt{6}\times\sqrt{10}\) की प्रकृति सही बताता है?

Which option correctly describes the nature of \(\sqrt{6}\times\sqrt{10}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

\(\sqrt{6}\times\sqrt{10}=\sqrt{60}=2\sqrt{15}\). Since (15) is not a perfect square the result is irrational.

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. \(\sqrt{6}\times\sqrt{10}=\sqrt{60}=2\sqrt{15}\). Since (15) is not a perfect square the result is irrational.

Step 3

Exam Tip

\(\sqrt{6}\times\sqrt{10}=\sqrt{60}=2\sqrt{15}\) है। (15) पूर्ण वर्ग नहीं है इसलिए परिणाम अपरिमेय है।

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यदि \(x=2\sqrt{5}\) और \(y=5\sqrt{2}\), तो (xy) की प्रकृति क्या है?

If \(x=2\sqrt{5}\) and \(y=5\sqrt{2}\), what is the nature of (xy)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

\(xy=2\sqrt{5}\times5\sqrt{2}=10\sqrt{10}\).

Step 2

Why this answer is correct

\(\sqrt{10}\) is irrational, so \(10\sqrt{10}\) is irrational.

Step 3

Exam Tip

If the product inside the root is not a perfect square, the result may remain irrational. चरण 1: \(xy=2\sqrt{5}\times5\sqrt{2}=10\sqrt{10}\)। चरण 2: \(\sqrt{10}\) अपरिमेय है, इसलिए \(10\sqrt{10}\) अपरिमेय है। चरण 3: गुणन के बाद अंदर की संख्या पूर्ण वर्ग नहीं बने तो परिणाम अपरिमेय रह सकता है।

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कौन-सा कथन गलत है?

Which statement is false?

Explanation opens after your attempt
Correct Answer

C. दो अपरिमेय संख्याओं का गुणनफल हमेशा अपरिमेय होता हैThe product of two irrational numbers is always irrational

Step 1

Concept

\(\sqrt{3}\) and \(\sqrt{3}\) are both irrational.

Step 2

Why this answer is correct

Their product is (3), which is rational.

Step 3

Exam Tip

Test always-type statements with a counterexample. चरण 1: \(\sqrt{3}\) और \(\sqrt{3}\) दोनों अपरिमेय हैं। चरण 2: इनका गुणनफल (3) है, जो परिमेय है। चरण 3: हमेशा वाले कथन को प्रतिउदाहरण से जांचें।

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कौन-सा कथन गलत है?

Which statement is false?

Explanation opens after your attempt
Correct Answer

C. दो अपरिमेय संख्याओं का गुणनफल हमेशा अपरिमेय होता हैThe product of two irrational numbers is always irrational

Step 1

Concept

\(\sqrt{2}\) and \(\sqrt{2}\) are both irrational.

Step 2

Why this answer is correct

Their product is (2), which is rational.

Step 3

Exam Tip

Test always-type statements with a counterexample. चरण 1: \(\sqrt{2}\) और \(\sqrt{2}\) दोनों अपरिमेय हैं। चरण 2: इनका गुणनफल (2) है, जो परिमेय है। चरण 3: हमेशा वाले कथन को प्रतिउदाहरण से जांचें।

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कौन-सा विकल्प दो अपरिमेय संख्याओं का ऐसा गुणनफल है जो परिमेय बनता है?

Which option is a product of two irrational numbers that becomes rational?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

\(\sqrt{5}\) is irrational.

Step 2

Why this answer is correct

\(\sqrt{5}\times\sqrt{5}=5\), which is rational.

Step 3

Exam Tip

The product of two irrational numbers is not always irrational. चरण 1: \(\sqrt{5}\) अपरिमेय है। चरण 2: \(\sqrt{5}\times\sqrt{5}=5\), जो परिमेय है। चरण 3: दो अपरिमेय संख्याओं का गुणनफल हमेशा अपरिमेय नहीं होता।

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यदि \(x=\sqrt{6}\), तो (2x) किस प्रकार की संख्या होगी?

If \(x=\sqrt{6}\), what type of number is (2x)?

Explanation opens after your attempt
Correct Answer

C. अपरिमेयIrrational

Step 1

Concept

\(x=\sqrt{6}\) is irrational.

Step 2

Why this answer is correct

\(2x=2\sqrt{6}\), and (2) is a non-zero rational number.

Step 3

Exam Tip

Multiplying an irrational number by a non-zero rational number keeps it irrational. चरण 1: \(x=\sqrt{6}\) अपरिमेय है। चरण 2: \(2x=2\sqrt{6}\), और (2) अशून्य परिमेय संख्या है। चरण 3: अपरिमेय संख्या को अशून्य परिमेय से गुणा करने पर परिणाम अपरिमेय रहता है।

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कौन-सा विकल्प दो अपरिमेय संख्याओं का ऐसा गुणनफल दिखाता है जो परिमेय है?

Which option shows a product of two irrational numbers that is rational?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{3}\times\sqrt{3}\)

Step 1

Concept

\(\sqrt{3}\) is irrational.

Step 2

Why this answer is correct

\(\sqrt{3}\times\sqrt{3}=3\), which is rational.

Step 3

Exam Tip

The product of two irrational numbers is not always irrational. चरण 1: \(\sqrt{3}\) अपरिमेय है। चरण 2: \(\sqrt{3}\times\sqrt{3}=3\), जो परिमेय है। चरण 3: दो अपरिमेय संख्याओं का गुणनफल हमेशा अपरिमेय नहीं होता।

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यदि \(x=\sqrt{5}\), तो (5x) कैसी संख्या होगी?

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

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

\(x=\sqrt{5}\) is irrational.

Step 2

Why this answer is correct

\(5x=5\sqrt{5}\), and (5) is a non-zero rational number.

Step 3

Exam Tip

Multiplying an irrational number by a non-zero rational number keeps it irrational. चरण 1: \(x=\sqrt{5}\) अपरिमेय है। चरण 2: \(5x=5\sqrt{5}\), और (5) अशून्य परिमेय है। चरण 3: अपरिमेय संख्या को अशून्य परिमेय से गुणा करने पर परिणाम अपरिमेय रहता है।

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\(\sqrt{2}\) और \(\sqrt{5}\) के गुणनफल की प्रकृति क्या है?

What is the nature of the product of \(\sqrt{2}\) and \(\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

\(\sqrt{2}\times\sqrt{5}=\sqrt{10}\).

Step 2

Why this answer is correct

(10) is not a perfect square, so \(\sqrt{10}\) is irrational.

Step 3

Exam Tip

After multiplication, check the number inside the new root. चरण 1: \(\sqrt{2}\times\sqrt{5}=\sqrt{10}\)। चरण 2: (10) पूर्ण वर्ग नहीं है, इसलिए \(\sqrt{10}\) अपरिमेय है। चरण 3: गुणन के बाद बने वर्गमूल की अंदर की संख्या जांचें।

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\(\sqrt{3}\times\sqrt{12}\) का मान क्या है?

What is the value of \(\sqrt{3}\times\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

\(\sqrt{3}\times\sqrt{12}=\sqrt{36}\).

Step 2

Why this answer is correct

\(\sqrt{36}=6\), so the result is rational.

Step 3

Exam Tip

Sometimes the product of two irrational numbers can be rational. चरण 1: \(\sqrt{3}\times\sqrt{12}=\sqrt{36}\)। चरण 2: \(\sqrt{36}=6\), इसलिए परिणाम परिमेय है। चरण 3: कभी-कभी दो अपरिमेय संख्याओं का गुणनफल परिमेय हो सकता है।

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\(\sqrt{5}\times\sqrt{5}\) का मान किस प्रकार की संख्या है?

What type of number is the value of \(\sqrt{5}\times\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

B. परिमेय संख्याRational number

Step 1

Concept

Multiplying a square root by itself gives the number inside the root.

Step 2

Why this answer is correct

\(\sqrt{5}\times\sqrt{5}=5\), and (5) is rational.

Step 3

Exam Tip

The product of two irrational numbers is not always irrational. चरण 1: किसी धनात्मक संख्या के वर्गमूल को उसी से गुणा करने पर वही संख्या मिलती है। चरण 2: \(\sqrt{5}\times\sqrt{5}=5\), और (5) परिमेय है। चरण 3: दो अपरिमेय संख्याओं का गुणनफल हमेशा अपरिमेय नहीं होता।

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यदि (a) एक अशून्य परिमेय संख्या है और (b) एक अपरिमेय संख्या है, तो (ab) सामान्यतः कैसी संख्या होगी?

If (a) is a non-zero rational number and (b) is an irrational number, what type of number is (ab) generally?

Explanation opens after your attempt
Correct Answer

B. अपरिमेय संख्याIrrational number

Step 1

Concept

Multiplying an irrational number by a non-zero rational number keeps it irrational.

Step 2

Why this answer is correct

For example, \(2 \times \sqrt{3}=2\sqrt{3}\), which is irrational.

Step 3

Exam Tip

The non-zero condition is important because multiplication by (0) gives (0). चरण 1: अशून्य परिमेय संख्या से अपरिमेय संख्या को गुणा करने पर परिणाम अपरिमेय रहता है। चरण 2: जैसे \(2 \times \sqrt{3}=2\sqrt{3}\), जो अपरिमेय है। चरण 3: यहां अशून्य शर्त जरूरी है, क्योंकि शून्य से गुणा करने पर परिणाम (0) होगा।

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