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Mathematics Substitution MCQ Questions for Class 9

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यदि \(y=4\) है, तो \(y^2\) का मान क्या होगा?

If \(y=4\), what is the value of \(y^2\)?

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Correct Answer

C. \(16\)

Explanation

Simple Explanation

\(y^2\) का अर्थ \(y\times y\) होता है। इसलिए \(y=4\) रखने पर \(y^2=4^2=4\times4=16\)। विकल्प 8, \(2y\) के बराबर है, \(y^2\) के नहीं। परीक्षा में पहले दिए गए मान को चर के स्थान पर रखें, फिर घात का मान निकालें। / \(y^2\) means \(y\times y\). Substituting \(y=4\), we get \(y^2=4^2=4\times4=16\). Option 8 equals \(2y\), not \(y^2\). In such questions, substitute the given value first and then evaluate the power.

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यदि \(u=7\) और \(v=2\) हों, तो \(u-v\) का मान क्या होगा?

If \(u=7\) and \(v=2\), what is the value of \(u-v\)?

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Correct Answer

B. 5

Explanation

Simple Explanation

दिए गए मानों को \(u-v\) में रखने पर \(7-2=5\) प्राप्त होता है, इसलिए सही उत्तर विकल्प B है। विकल्प A में जोड़ \(7+2=9\) किया गया है, जबकि विकल्प C गुणा \(7\times2=14\) और विकल्प D गलत घटाव को दर्शाता है। परीक्षा में घटाव करते समय पदों का क्रम ध्यान से देखें, क्योंकि \(u-v\) और \(v-u\) के मान अलग होते हैं। / Substituting the given values in \(u-v\) gives \(7-2=5\), so option B is correct. Option A results from addition, \(7+2=9\), option C results from multiplication, \(7\times2=14\), and option D is an incorrect subtraction. In an exam, carefully preserve the order of terms because \(u-v\) and \(v-u\) generally have different values.

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Substitution FAQs

How can I practice Substitution MCQs?

Select Easy, Medium, Hard or Expert topic quiz on this page and answer topic-wise questions with explanations.

Are answers available for Substitution questions?

Yes, questions include answer feedback and explanations for revision.

Is this topic useful for Class 9 exams?

Yes, this topic page is arranged for chapter-wise revision and exam practice.