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impossible case MCQ Questions for Class 10

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Practice Questions

1 questions tagged with impossible case.

Question 1/1 Expert Mathematics Chapter 1: Real Numbers 3: Prime factorisation Class 10 Level 7

यदि \(2^3\times3^x\times5^2\) एक पूर्ण वर्ग है, तो (x) के लिए कौन सा मान संभव नहीं है?

If \(2^3\times3^x\times5^2\) is a perfect square, which value of (x) is not possible?

Explanation opens after your attempt
Correct Answer

D. कोई भी मान संभव नहीं हैNone of the values is possible

Step 1

Concept

A perfect square requires all prime exponents to be even.

Step 2

Why this answer is correct

The exponent of (2) is already (3), which is odd, so changing only (x) cannot make the number a perfect square.

Step 3

Exam Tip

Check the whole prime factorisation, not only the unknown exponent. चरण 1: पूर्ण वर्ग में सभी अभाज्य घातें सम होनी चाहिए। चरण 2: यहां \(2^3\) की घात पहले से विषम है, इसलिए केवल (x) बदलने से संख्या पूर्ण वर्ग नहीं बन सकती। चरण 3: पूरी अभाज्य रचना देखें, केवल अज्ञात घात पर ध्यान न दें।

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