Concept-wise Practice

product of roots MCQ Questions for Class 10

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Practice Questions

1 questions tagged with product of roots.

Question 1/1 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\sqrt{a}\times\sqrt{b}\) को परिमेय बनाने के लिए सही उदाहरण है?

Which option is a correct example that makes \(\sqrt{a}\times\sqrt{b}\) rational?

Explanation opens after your attempt
Correct Answer

B. (a=3,b=12)

Step 1

Concept

\(\sqrt{a}\times\sqrt{b}=\sqrt{ab}\).

Step 2

Why this answer is correct

For (a=3,b=12), (ab=36), so \(\sqrt{36}=6\), which is rational.

Step 3

Exam Tip

Check whether the product inside the radical becomes a perfect square. चरण 1: \(\sqrt{a}\times\sqrt{b}=\sqrt{ab}\) होता है। चरण 2: (a=3,b=12) पर (ab=36), इसलिए \(\sqrt{36}=6\), जो परिमेय है। चरण 3: गुणन के बाद अंदर की संख्या पूर्ण वर्ग बन रही है या नहीं, यह देखें।

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