Concept-wise Practice

common mistake MCQ Questions for Class 10

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Practice Questions

10 questions tagged with common mistake.

Question 1/10 Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

कौन सा कथन \(\sqrt{2}\), \(\sqrt{3}\), और \(\sqrt{5}\) की सिद्धि में गलत तरीका है?

Which statement is a wrong method in the proofs of \(\sqrt{2}\), \(\sqrt{3}\), and \(\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. वर्गमूल को अंदर की संख्या के बराबर माननाTreating the square root as equal to the number inside it

Step 1

Concept

Writing \(\sqrt{2}=2\), \(\sqrt{3}=3\), or \(\sqrt{5}=5\) is wrong.

Step 2

Why this answer is correct

The correct method assumes rationality, writes a fraction, and squares.

Step 3

Exam Tip

Do not treat a square root as equal to the number inside. चरण 1: \(\sqrt{2}=2\), \(\sqrt{3}=3\), या \(\sqrt{5}=5\) लिखना गलत है। चरण 2: सही विधि में परिमेय मानकर भिन्न लिखते हैं और वर्ग करते हैं। चरण 3: वर्गमूल को अंदर की संख्या के बराबर न मानें।

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Question 2/10 Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 16

कौन सा विकल्प तीनों प्रमाणों में गलत तरीका है?

Which option is a wrong method in all three proofs?

Explanation opens after your attempt
Correct Answer

A. वर्गमूल को अंदर की संख्या के बराबर मान लेनाTaking the square root equal to the number under it

Step 1

Concept

Treating \(\sqrt{2}\), \(\sqrt{3}\), and \(\sqrt{5}\) as (2), (3), and (5) is wrong.

Step 2

Why this answer is correct

The correct method assumes rationality, writes a fraction, and squares.

Step 3

Exam Tip

Do not write a square root equal to the number under it. चरण 1: \(\sqrt{2}\), \(\sqrt{3}\), और \(\sqrt{5}\) को क्रमशः (2), (3), और (5) के बराबर मानना गलत है। चरण 2: सही विधि में परिमेय मानकर भिन्न रूप लेते हैं और वर्ग करते हैं। चरण 3: वर्गमूल को अंदर की संख्या के बराबर न लिखें।

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Question 3/10 Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 16

कौन सा कथन \(\sqrt{2}\) की अपरिमेयता के प्रमाण में गलत कदम है?

Which statement is a wrong step in the proof of irrationality of \(\sqrt{2}\)?

Explanation opens after your attempt
Correct Answer

D. \(p^2=2q^2\) से सीधे (p=2q)From \(p^2=2q^2\), directly (p=2q)

Step 1

Concept

From \(p^2=2q^2\), we conclude \(p^2\) is even.

Step 2

Why this answer is correct

This gives (p) even, but not directly (p=2q).

Step 3

Exam Tip

The correct form is (p=2r), where (r) is an integer. चरण 1: \(p^2=2q^2\) से \(p^2\) के सम होने का निष्कर्ष निकलता है। चरण 2: इससे (p) सम है, लेकिन सीधे (p=2q) नहीं लिख सकते। चरण 3: सही रूप (p=2r) होता है, जहां (r) पूर्णांक है।

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Question 4/10 Easy Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

कौन सा कथन \(\sqrt{3}\) के प्रमाण में गलत कदम है?

Which statement is a wrong step in the proof of \(\sqrt{3}\)?

Explanation opens after your attempt
Correct Answer

D. \(p^2=3q^2\) से (p=3q)From \(p^2=3q^2\), (p=3q)

Step 1

Concept

From \(p^2=3q^2\), \(p^2\) is divisible by (3).

Step 2

Why this answer is correct

This gives (p) divisible by (3), but we cannot directly write (p=3q).

Step 3

Exam Tip

The correct way is to write (p=3k). चरण 1: \(p^2=3q^2\) से \(p^2\) (3) से विभाज्य है। चरण 2: इससे (p) (3) से विभाज्य है, लेकिन सीधे (p=3q) नहीं लिखा जा सकता। चरण 3: सही तरीका है (p=3k) लिखना।

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Question 5/10 Easy Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 18

\(\sqrt{2}\) के प्रमाण में \(p^2=2q^2\) से सीधे कौन सा गलत निष्कर्ष नहीं निकालना चाहिए?

In the proof of \(\sqrt{2}\), which wrong conclusion should not be drawn directly from \(p^2=2q^2\)?

Explanation opens after your attempt
Correct Answer

C. (p=2q)

Step 1

Concept

From \(p^2=2q^2\), we get only that \(p^2\) is even.

Step 2

Why this answer is correct

Then by rule, (p) is even and can be written as (p=2k).

Step 3

Exam Tip

Writing (p=2q) directly from it is wrong. चरण 1: \(p^2=2q^2\) से केवल यह मिलता है कि \(p^2\) सम है। चरण 2: फिर नियम से (p) सम है और (p=2k) लिखा जा सकता है। चरण 3: इससे सीधे (p=2q) लिखना गलत है।

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Question 6/10 Easy Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 17

\(\sqrt{3}\) के प्रमाण में \(a^2=3b^2\) से सीधे कौन सा गलत निष्कर्ष नहीं लेना चाहिए?

In the proof of \(\sqrt{3}\), which wrong conclusion should not be taken directly from \(a^2=3b^2\)?

Explanation opens after your attempt
Correct Answer

A. (a=3b)

Step 1

Concept

From \(a^2=3b^2\), \(a^2\) is divisible by (3).

Step 2

Why this answer is correct

Then (a) is divisible by (3), so (a=3k).

Step 3

Exam Tip

Directly writing (a=3b) from the equation is wrong. चरण 1: \(a^2=3b^2\) से \(a^2\) (3) से विभाज्य है। चरण 2: फिर (a) (3) से विभाज्य है और (a=3k) लिखते हैं। चरण 3: इस समीकरण से सीधे (a=3b) लिखना गलत है।

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Question 7/10 Easy Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 16

\(\sqrt{5}\) के प्रमाण में कौन सा चरण गलत है?

Which step is wrong in the proof of \(\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. \(p^2=5q^2\) से (p=5q) लिखनाWriting (p=5q) from \(p^2=5q^2\)

Step 1

Concept

From \(p^2=5q^2\), we get that \(p^2\) is divisible by (5).

Step 2

Why this answer is correct

We cannot directly write (p=5q).

Step 3

Exam Tip

The correct step is to say (p) is divisible by (5), then write (p=5k). चरण 1: \(p^2=5q^2\) से यह मिलता है कि \(p^2\) (5) से विभाज्य है। चरण 2: इससे सीधे (p=5q) नहीं लिख सकते। चरण 3: सही कदम है कि (p) (5) से विभाज्य है, फिर (p=5k) लिखें।

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Question 8/10 Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{a}+\sqrt{b}=\sqrt{a+b}\) जैसी गलत सोच को खंडित करता है?

Which option disproves the wrong idea \(\sqrt{a}+\sqrt{b}=\sqrt{a+b}\)?

Explanation opens after your attempt
Correct Answer

A. (a=4,b=9)

Step 1

Concept

For (a=4,b=9), the left side is (2+3=5).

Step 2

Why this answer is correct

The right side is \(\sqrt{13}\), which is not (5).

Step 3

Exam Tip

When adding square roots, the numbers inside the roots are not added directly. चरण 1: (a=4,b=9) रखने पर बायाँ पक्ष (2+3=5) है। चरण 2: दायाँ पक्ष \(\sqrt{13}\) है, जो (5) नहीं है। चरण 3: वर्गमूलों को जोड़ते समय अंदर की संख्याएँ सीधे नहीं जोड़ी जातीं।

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Question 9/10 Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

कौन-सा विकल्प \(\sqrt{75}\) और \(\sqrt{27}\) के योग को सही बताता है?

Which option correctly gives the sum of \(\sqrt{75}\) and \(\sqrt{27}\)?

Explanation opens after your attempt
Correct Answer

A. \(8\sqrt{3}\)

Step 1

Concept

\(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{27}=3\sqrt{3}\).

Step 2

Why this answer is correct

The sum is \(5\sqrt{3}+3\sqrt{3}=8\sqrt{3}\).

Step 3

Exam Tip

Do not combine separate square roots directly into one root. चरण 1: \(\sqrt{75}=5\sqrt{3}\) और \(\sqrt{27}=3\sqrt{3}\)। चरण 2: योग \(5\sqrt{3}+3\sqrt{3}=8\sqrt{3}\) है। चरण 3: अलग-अलग मूलों को सीधे जोड़कर एक मूल न बनाएं।

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

कौन-सी संख्या \(\sqrt{27}+\sqrt{12}\) का सरल रूप है?

Which number is the simplified form of \(\sqrt{27}+\sqrt{12}\)?

Explanation opens after your attempt
Correct Answer

A. \(5\sqrt{3}\)

Step 1

Concept

\(\sqrt{27}=3\sqrt{3}\) and \(\sqrt{12}=2\sqrt{3}\).

Step 2

Why this answer is correct

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

Step 3

Exam Tip

Do not combine separate square roots as \(\sqrt{39}\). चरण 1: \(\sqrt{27}=3\sqrt{3}\) और \(\sqrt{12}=2\sqrt{3}\)। चरण 2: योग \(3\sqrt{3}+2\sqrt{3}=5\sqrt{3}\), जो अपरिमेय है। चरण 3: अलग-अलग मूलों को सीधे जोड़कर \(\sqrt{39}\) न लिखें।

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