Concept-wise Practice

irrational-number MCQ Questions for Class 10

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Practice Questions

4 questions tagged with irrational-number.

Question 1/4 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(\sqrt{45}\) और \(2\sqrt{5}\) के अंतर को सही बताता है?

Which option correctly gives the difference between \(\sqrt{45}\) and \(2\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{5}\)

Step 1

Concept

\(\sqrt{45}=3\sqrt{5}\).

Step 2

Why this answer is correct

The difference is \(3\sqrt{5}-2\sqrt{5}=\sqrt{5}\), which is irrational.

Step 3

Exam Tip

For like surds, subtract only the coefficients. चरण 1: \(\sqrt{45}=3\sqrt{5}\) है। चरण 2: अंतर \(3\sqrt{5}-2\sqrt{5}=\sqrt{5}\), जो अपरिमेय है। चरण 3: समान मूल वाले पदों में केवल गुणांक घटाएँ।

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Question 2/4 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि (x) अपरिमेय है, तो (x+0) के बारे में सही कथन क्या है?

If (x) is irrational, which statement about (x+0) is correct?

Explanation opens after your attempt
Correct Answer

B. यह अपरिमेय हैIt is irrational

Step 1

Concept

(0) is rational.

Step 2

Why this answer is correct

(x+0=x), so the nature remains the same and it is irrational.

Step 3

Exam Tip

Adding zero does not change either the value or the type of a number. चरण 1: (0) परिमेय संख्या है। चरण 2: (x+0=x), इसलिए संख्या की प्रकृति वही रहेगी और वह अपरिमेय होगी। चरण 3: शून्य जोड़ने से मान और प्रकृति दोनों नहीं बदलते।

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Question 3/4 Easy Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

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

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

Explanation opens after your attempt
Correct Answer

B. अपरिमेय संख्याIrrational number

Step 1

Concept

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

Step 2

Why this answer is correct

(2) is a non-zero rational number, so \(2\sqrt{3}\) remains irrational.

Step 3

Exam Tip

Do not call a radical rational just because it has a coefficient outside. चरण 1: \(\sqrt{3}\) अपरिमेय है। चरण 2: (2) अशून्य परिमेय संख्या है, इसलिए \(2\sqrt{3}\) अपरिमेय रहेगा। चरण 3: बाहर का गुणांक देखकर संख्या को परिमेय न मानें।

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Question 4/4 Easy Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

\(\frac{1}{\sqrt{2}}\) किस प्रकार की संख्या है?

What type of number is \(\frac{1}{\sqrt{2}}\)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेय संख्याIrrational number

Step 1

Concept

\(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

\(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\), which is irrational.

Step 3

Exam Tip

When a square root is in the denominator, rationalising helps identify the number. चरण 1: \(\sqrt{2}\) अपरिमेय है। चरण 2: \(\frac{1}{\sqrt{2}}=\frac{\sqrt{2}}{2}\), जो अपरिमेय है। चरण 3: हर में वर्गमूल हो तो परिमेयकरण करके पहचानना आसान होता है।

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