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Mathematics Substitution MCQ Questions for Class 9

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Substitution Practice Questions

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Question 1/5 Easy Mathematics MIX Substitution Class 9 Level 2

यदि (x=6) हो तो (x+8) का मान क्या होगा?

If (x=6) then what is the value of (x+8)?

Explanation opens after your attempt
Correct Answer

B. (14)

Step 1

Concept

Substituting (6) for (x) gives (6+8=14). Substitute first while evaluating.

Step 2

Why this answer is correct

The correct answer is B. (14). Substituting (6) for (x) gives (6+8=14). Substitute first while evaluating.

Step 3

Exam Tip

(x) के स्थान पर (6) रखने से (6+8=14) मिलता है। मान निकालते समय पहले प्रतिस्थापन करें।

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Question 2/5 Easy Mathematics MIX Substitution Class 9 Level 2

यदि (a=5) हो तो (3a) का मान क्या है?

If (a=5) then what is the value of (3a)?

Explanation opens after your attempt
Correct Answer

B. (15)

Step 1

Concept

(3a) means \(3\times a\). So \(3\times5=15\).

Step 2

Why this answer is correct

The correct answer is B. (15). (3a) means \(3\times a\). So \(3\times5=15\).

Step 3

Exam Tip

(3a) का अर्थ \(3\times a\) है। इसलिए \(3\times5=15\) होगा।

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Question 3/5 Easy Mathematics MIX Substitution Class 9 Level 2

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

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

Explanation opens after your attempt
Correct Answer

C. (16)

Step 1

Concept

In \(y^2\), \(4^2=16\). Power means repeated multiplication.

Step 2

Why this answer is correct

The correct answer is C. (16). In \(y^2\), \(4^2=16\). Power means repeated multiplication.

Step 3

Exam Tip

\(y^2\) में \(4^2=16\) होगा। घात का अर्थ बार-बार गुणा होता है।

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Question 4/5 Easy Mathematics MIX Substitution Class 9 Level 2

यदि (r=2) और (s=3) हों तो (r+s) का मान क्या है?

If (r=2) and (s=3), what is the value of (r+s)?

Explanation opens after your attempt
Correct Answer

B. (5)

Step 1

Concept

Substituting the given values gives (2+3=5). When there are two variables substitute both.

Step 2

Why this answer is correct

The correct answer is B. (5). Substituting the given values gives (2+3=5). When there are two variables substitute both.

Step 3

Exam Tip

दिए गए मान रखने पर (2+3=5) होता है। दो चर हों तो दोनों का प्रतिस्थापन करें।

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Question 5/5 Easy Mathematics MIX Substitution Class 9 Level 2

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)?

Explanation opens after your attempt
Correct Answer

B. (5)

Step 1

Concept

(u-v=7-2=5). In subtraction changing the order can change the answer.

Step 2

Why this answer is correct

The correct answer is B. (5). (u-v=7-2=5). In subtraction changing the order can change the answer.

Step 3

Exam Tip

(u-v=7-2=5) है। घटाव में क्रम बदलने से उत्तर बदल सकता है।

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