Concept-wise Practice

zero multiplier MCQ Questions for Class 10

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Practice Questions

1 questions tagged with zero multiplier.

किस विकल्प में संख्या निश्चित रूप से अपरिमेय है?

In which option is the number definitely irrational?

Explanation opens after your attempt
Correct Answer

B. \(4\sqrt{7}\)

Step 1

Concept

\(0\times\sqrt{7}=0\), \(\sqrt{7}\times\sqrt{7}=7\), and \(\sqrt{28}\div\sqrt{7}=2\) are rational.

Step 2

Why this answer is correct

\(4\sqrt{7}\) is a non-zero rational multiple of an irrational number, so it is irrational.

Step 3

Exam Tip

Quickly identify multiplication by zero as rational. चरण 1: \(0\times\sqrt{7}=0\), \(\sqrt{7}\times\sqrt{7}=7\), और \(\sqrt{28}\div\sqrt{7}=2\) परिमेय हैं। चरण 2: \(4\sqrt{7}\) में अशून्य परिमेय गुणक और अपरिमेय मूल है, इसलिए यह अपरिमेय है। चरण 3: शून्य से गुणा वाले विकल्प को जल्दी परिमेय पहचानें।

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