Concept-wise Practice

root-check MCQ Questions for Class 10

root-check se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

7 questions tagged with root-check.

यदि \(x^2-7x+10=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\frac{\alpha+2}{\alpha-2}+\frac{\beta+2}{\beta-2}\) का मान क्या है?

If \(\alpha,\beta\) are the roots of \(x^2-7x+10=0\), what is \(\frac{\alpha+2}{\alpha-2}+\frac{\beta+2}{\beta-2}\)?

Explanation opens after your attempt
Correct Answer

A. अपरिभाषितUndefined

Step 1

Concept

One root can be \(\alpha=2\), which makes \(\alpha-2=0\). Therefore the expression is undefined; always check zero denominators first in exams.

Step 2

Why this answer is correct

The correct answer is A. अपरिभाषित / Undefined. One root can be \(\alpha=2\), which makes \(\alpha-2=0\). Therefore the expression is undefined; always check zero denominators first in exams.

Step 3

Exam Tip

जड़ों में से एक \(\alpha=2\) हो सकती है, जिससे \(\alpha-2=0\) बनता है। इसलिए व्यंजक अपरिभाषित है; परीक्षा में हर पहले शून्य हर देखें।

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क्या (x=5) समीकरण \(x^2-6x+5=0\) का मूल है?

Is (x=5) a root of \(x^2-6x+5=0\)?

Explanation opens after your attempt
Correct Answer

A. हाँYes

Step 1

Concept

Putting (x=5) gives (25-30+5=0). Substitution is the simple way to check a root.

Step 2

Why this answer is correct

The correct answer is A. हाँ / Yes. Putting (x=5) gives (25-30+5=0). Substitution is the simple way to check a root.

Step 3

Exam Tip

(x=5) रखने पर (25-30+5=0) मिलता है। मूल जांचने का सरल तरीका प्रतिस्थापन है।

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किस समीकरण में (x=-2) मूल नहीं है?

In which equation is (x=-2) not a root?

Explanation opens after your attempt
Correct Answer

D. \(x^2-2x+4=0\)

Step 1

Concept

Putting (x=-2) gives \(4+4+4=12\neq0\). To check a non-root, use substitution too.

Step 2

Why this answer is correct

The correct answer is D. \(x^2-2x+4=0\). Putting (x=-2) gives \(4+4+4=12\neq0\). To check a non-root, use substitution too.

Step 3

Exam Tip

(x=-2) रखने पर \(4+4+4=12\neq0\) मिलता है। मूल न होने की जांच भी प्रतिस्थापन से करें।

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क्या (x=-1) समीकरण \(x^2+5x+4=0\) का मूल है?

Is (x=-1) a root of \(x^2+5x+4=0\)?

Explanation opens after your attempt
Correct Answer

A. हाँYes

Step 1

Concept

Putting (x=-1) gives (1-5+4=0). To check a root, substitute the given value directly.

Step 2

Why this answer is correct

The correct answer is A. हाँ / Yes. Putting (x=-1) gives (1-5+4=0). To check a root, substitute the given value directly.

Step 3

Exam Tip

(x=-1) रखने पर (1-5+4=0) मिलता है। मूल की जांच के लिए दिए मान को सीधे रखें।

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किस समीकरण में (x=1) मूल नहीं है?

In which equation is (x=1) not a root?

Explanation opens after your attempt
Correct Answer

D. \(x^2+x+1=0\)

Step 1

Concept

Putting (x=1) gives \(1+1+1=3\neq 0\). To check when a value is not a root, use substitution too.

Step 2

Why this answer is correct

The correct answer is D. \(x^2+x+1=0\). Putting (x=1) gives \(1+1+1=3\neq 0\). To check when a value is not a root, use substitution too.

Step 3

Exam Tip

(x=1) रखने पर \(1+1+1=3\neq 0\) मिलता है। किसी विकल्प में मूल न होने की जांच भी प्रतिस्थापन से करें।

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क्या (x=3) समीकरण \(x^2-4x+3=0\) का मूल है?

Is (x=3) a root of \(x^2-4x+3=0\)?

Explanation opens after your attempt
Correct Answer

A. हाँYes

Step 1

Concept

Putting (x=3) gives (9-12+3=0). To check a root, substitute the given value directly.

Step 2

Why this answer is correct

The correct answer is A. हाँ / Yes. Putting (x=3) gives (9-12+3=0). To check a root, substitute the given value directly.

Step 3

Exam Tip

(x=3) रखने पर (9-12+3=0) मिलता है। मूल जांचने के लिए दिए मान को सीधे समीकरण में रखें।

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क्या (x=1) समीकरण \(x^2-x=0\) का मूल है?

Is (x=1) a root of \(x^2-x=0\)?

Explanation opens after your attempt
Correct Answer

A. हाँYes

Step 1

Concept

Putting (x=1) gives \(1^2-1=0\). To check a root, directly substitute the given value.

Step 2

Why this answer is correct

The correct answer is A. हाँ / Yes. Putting (x=1) gives \(1^2-1=0\). To check a root, directly substitute the given value.

Step 3

Exam Tip

(x=1) रखने पर \(1^2-1=0\) मिलता है। मूल की जांच में दिया हुआ मान सीधे रखें।

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