Concept-wise Practice

real-roots MCQ Questions for Class 10

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

Practice Questions

23 questions tagged with real-roots.

Question 1/23 Easy Mathematics Quadratic Equations Nature of Roots Class 10 Level 37

यदि द्विघात समीकरण के लिए (D>0) हो तो मूलों की प्रकृति क्या होगी?

If (D>0) for a quadratic equation, what will be the nature of roots?

Explanation opens after your attempt
Correct Answer

A. दो वास्तविक और असमानtwo real and distinct

Step 1

Concept

When (D>0), two different real roots are obtained. Check the sign first in exams.

Step 2

Why this answer is correct

The correct answer is A. दो वास्तविक और असमान / two real and distinct. When (D>0), two different real roots are obtained. Check the sign first in exams.

Step 3

Exam Tip

(D>0) होने पर दो अलग-अलग वास्तविक मूल मिलते हैं। चिन्ह देखकर प्रकृति तुरंत लिखें।

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Question 2/23 Easy Mathematics Quadratic Equations Methods of Solving Quadratic Equations Class 10 Level 34

यदि (D>0), तो द्विघात समीकरण के मूल कैसे होते हैं?

If (D>0), what type of roots does a quadratic equation have?

Explanation opens after your attempt
Correct Answer

A. दो अलग वास्तविक मूलTwo distinct real roots

Step 1

Concept

When (D>0), two distinct real roots are obtained. In exams, check the sign of (D) carefully.

Step 2

Why this answer is correct

The correct answer is A. दो अलग वास्तविक मूल / Two distinct real roots. When (D>0), two distinct real roots are obtained. In exams, check the sign of (D) carefully.

Step 3

Exam Tip

(D>0) होने पर दो अलग-अलग वास्तविक मूल मिलते हैं। परीक्षा में (D) का चिह्न ध्यान से देखें।

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Question 3/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

(9x-2-6(a-1)x+a-2-4a-5=0) की जड़ें वास्तविक हों, तो सही शर्त क्या है?

What is the correct condition for (9x-2-6(a-1)x+a-2-4a-5=0) to have real roots?

Explanation opens after your attempt
Correct Answer

A. \(a\ge-3\)

Step 1

Concept

Here (D=36(a-1)2-36\(a^2-4a-5\)=72(a+3)). For real roots, \(D\ge0\), so \(a\ge-3\).

Step 2

Why this answer is correct

The correct answer is A. \(a\ge-3\). Here (D=36(a-1)2-36\(a^2-4a-5\)=72(a+3)). For real roots, \(D\ge0\), so \(a\ge-3\).

Step 3

Exam Tip

यहाँ (D=36(a-1)2-36\(a^2-4a-5\)=72(a+3)) है। वास्तविक जड़ों के लिए \(D\ge0\), इसलिए \(a\ge-3\)।

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Question 4/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

(9x-2-6(a-1)x+a-2-4a-5=0) की जड़ें वास्तविक हों, तो (a) पर सही शर्त क्या है?

For (9x-2-6(a-1)x+a-2-4a-5=0) to have real roots, what is the correct condition on (a)?

Explanation opens after your attempt
Correct Answer

A. \(a\ge-\frac{7}{2}\)

Step 1

Concept

For real roots, \(D\ge0\) is required. Here (D=36(a-1)2-36\(a^2-4a-5\)=72a+216), so the exact condition is \(a\ge-3\), not \(a\ge-\frac{7}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(a\ge-\frac{7}{2}\). For real roots, \(D\ge0\) is required. Here (D=36(a-1)2-36\(a^2-4a-5\)=72a+216), so the exact condition is \(a\ge-3\), not \(a\ge-\frac{7}{2}\).

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge0\) चाहिए। यहाँ (D=36(a-1)2-36\(a^2-4a-5\)=72a+216), इसलिए \(a\ge-\frac{7}{2}\) नहीं बल्कि \(a\ge-3\) होगा।

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Question 5/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

(16x-2-8(a-2)x+a-2-6a=0) की जड़ें वास्तविक हों, तो (a) पर सही शर्त क्या है?

For (16x-2-8(a-2)x+a-2-6a=0) to have real roots, what is the correct condition on (a)?

Explanation opens after your attempt
Correct Answer

A. \(a\ge1\)

Step 1

Concept

For real roots, \(D\ge0\) is required. Here (D=64(a-2)2-64\(a^2-6a\)=128(a+2)), so \(a\ge-2\); hence none of these options is exact.

Step 2

Why this answer is correct

The correct answer is A. \(a\ge1\). For real roots, \(D\ge0\) is required. Here (D=64(a-2)2-64\(a^2-6a\)=128(a+2)), so \(a\ge-2\); hence none of these options is exact.

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge0\) चाहिए। यहाँ (D=64(a-2)2-64\(a^2-6a\)=128(a+2)), इसलिए \(a\ge-2\) होगा, अतः विकल्पों में सही शर्त नहीं है।

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Question 6/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

यदि \(kx^2-12x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हैं, तो (k) पर सही शर्त क्या है?

If \(kx^2-12x+k=0\) has real reciprocal roots, what is the correct condition on (k)?

Explanation opens after your attempt
Correct Answer

A. \(k\neq0\) और \(k^2\le36\)\(k\neq0\) and \(k^2\le36\)

Step 1

Concept

The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(144-4k^2\ge0\), hence \(k^2\le36\).

Step 2

Why this answer is correct

The correct answer is A. \(k\neq0\) और \(k^2\le36\) / \(k\neq0\) and \(k^2\le36\). The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(144-4k^2\ge0\), hence \(k^2\le36\).

Step 3

Exam Tip

जड़ों का गुणनफल \(\frac{k}{k}=1\) है, इसलिए \(k\neq0\) चाहिए। वास्तविक जड़ों के लिए \(144-4k^2\ge0\), अतः \(k^2\le36\)।

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Question 7/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 32

यदि (x-2-2mx+\(m^2-m\)=0) की जड़ें वास्तविक हों, तो (m) पर सही शर्त क्या है?

If (x-2-2mx+\(m^2-m\)=0) has real roots, what is the correct condition on (m)?

Explanation opens after your attempt
Correct Answer

C. \(m\ge0\)

Step 1

Concept

For real roots, \(D\ge0\) is required. Here (D=4m), so \(m\ge0\).

Step 2

Why this answer is correct

The correct answer is C. \(m\ge0\). For real roots, \(D\ge0\) is required. Here (D=4m), so \(m\ge0\).

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge0\) चाहिए। यहाँ (D=4m), इसलिए \(m\ge0\)।

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Question 8/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 32

(9x-2-6(a+1)x+a-2-3a=0) की जड़ें वास्तविक हों, तो (a) पर सही शर्त क्या है?

For (9x-2-6(a+1)x+a-2-3a=0) to have real roots, what is the correct condition on (a)?

Explanation opens after your attempt
Correct Answer

A. \(a\ge-\frac{1}{5}\)

Step 1

Concept

For real roots, \(D\ge0\) is required. Here (D=36(5a+1)), so \(a\ge-\frac{1}{5}\).

Step 2

Why this answer is correct

The correct answer is A. \(a\ge-\frac{1}{5}\). For real roots, \(D\ge0\) is required. Here (D=36(5a+1)), so \(a\ge-\frac{1}{5}\).

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge0\) चाहिए। यहाँ (D=36(5a+1)), इसलिए \(a\ge-\frac{1}{5}\)।

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Question 9/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 32

यदि \(kx^2-10x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हैं, तो (k) पर सही शर्त कौन-सी है?

If \(kx^2-10x+k=0\) has real reciprocal roots, which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

C. \(k\neq0\) और \(k^2\le25\)\(k\neq0\) and \(k^2\le25\)

Step 1

Concept

The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(100-4k^2\ge0\), hence \(k^2\le25\).

Step 2

Why this answer is correct

The correct answer is C. \(k\neq0\) और \(k^2\le25\) / \(k\neq0\) and \(k^2\le25\). The product of roots is \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(100-4k^2\ge0\), hence \(k^2\le25\).

Step 3

Exam Tip

जड़ों का गुणनफल \(\frac{k}{k}=1\) है, इसलिए \(k\neq0\) चाहिए। वास्तविक जड़ों के लिए \(100-4k^2\ge0\), अतः \(k^2\le25\)।

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Question 10/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 31

(4x-2-4(a-1)x+a-2-4a=0) की जड़ें वास्तविक हों, तो (a) पर सही शर्त क्या है?

For (4x-2-4(a-1)x+a-2-4a=0) to have real roots, what is the correct condition on (a)?

Explanation opens after your attempt
Correct Answer

A. \(a\le1\)

Step 1

Concept

For real roots, \(D\ge0\) is required. Here (D=16(1-a)), so \(a\le1\).

Step 2

Why this answer is correct

The correct answer is A. \(a\le1\). For real roots, \(D\ge0\) is required. Here (D=16(1-a)), so \(a\le1\).

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge0\) चाहिए। यहाँ (D=16(1-a)), इसलिए \(a\le1\) है।

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Question 11/23 Expert Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 31

यदि \(kx^2-8x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हैं, तो (k) पर सही शर्त क्या है?

If the roots of \(kx^2-8x+k=0\) are real and reciprocal, what is the correct condition on (k)?

Explanation opens after your attempt
Correct Answer

A. \(k\neq0\) और \(k^2\le16\)\(k\neq0\) and \(k^2\le16\)

Step 1

Concept

For reciprocal roots, \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(64-4k^2\ge0\), hence \(k^2\le16\).

Step 2

Why this answer is correct

The correct answer is A. \(k\neq0\) और \(k^2\le16\) / \(k\neq0\) and \(k^2\le16\). For reciprocal roots, \(\frac{k}{k}=1\), so \(k\neq0\) is needed. For real roots, \(64-4k^2\ge0\), hence \(k^2\le16\).

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए \(\frac{k}{k}=1\) है, इसलिए \(k\neq0\) चाहिए। वास्तविक जड़ों के लिए \(64-4k^2\ge0\), अतः \(k^2\le16\)।

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Question 12/23 Hard Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

\(x^2-4x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हों, तो (k) का मान क्या है?

If the roots of \(x^2-4x+k=0\) are real and reciprocal, what is (k)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=k\), so (k=1), and (D=12>0) confirms real roots.

Step 2

Why this answer is correct

The correct answer is A. (1). For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=k\), so (k=1), and (D=12>0) confirms real roots.

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए \(\alpha\beta=1\) होता है। यहाँ \(\alpha\beta=k\), इसलिए (k=1), और (D=12>0) से जड़ें वास्तविक भी हैं।

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Question 13/23 Hard Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

\(kx^2+6x+9=0\) की वास्तविक जड़ें हों और \(k\ne0\), तो (k) पर सही शर्त कौन-सी है?

For \(kx^2+6x+9=0\) to have real roots with \(k\ne0\), which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

A. \(k\le 1,\ k\ne0\)

Step 1

Concept

For real roots, \(D=36-36k\ge0\) is required. Thus \(k\le1\), and \(k\ne0\) is also needed for a quadratic equation.

Step 2

Why this answer is correct

The correct answer is A. \(k\le 1,\ k\ne0\). For real roots, \(D=36-36k\ge0\) is required. Thus \(k\le1\), and \(k\ne0\) is also needed for a quadratic equation.

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D=36-36k\ge0\) होना चाहिए। इसलिए \(k\le1\) और द्विघात के लिए \(k\ne0\) भी जरूरी है।

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Question 14/23 Hard Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

(x-2-2(a+1)x+a-2+3=0) की जड़ें वास्तविक हों, इसके लिए (a) पर सही शर्त क्या है?

What is the correct condition on (a) so that (x-2-2(a+1)x+a-2+3=0) has real roots?

Explanation opens after your attempt
Correct Answer

B. \(a\ge 1\)

Step 1

Concept

For real roots, \(D\ge 0\) is required. Here (D=8(a-1)), so \(a\ge 1\) is correct.

Step 2

Why this answer is correct

The correct answer is B. \(a\ge 1\). For real roots, \(D\ge 0\) is required. Here (D=8(a-1)), so \(a\ge 1\) is correct.

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge 0\) चाहिए। यहाँ (D=8(a-1)), इसलिए \(a\ge 1\) सही है।

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Question 15/23 Medium Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 33

समीकरण \(x^2+6x+k=0\) के वास्तविक मूल होने के लिए (k) के बारे में कौन सी शर्त सही है?

For \(x^2+6x+k=0\) to have real roots, which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

A. \(k\le9\)

Step 1

Concept

For real roots \(D\ge0\) is required. From \(36-4k\ge0\), we get \(k\le9\).

Step 2

Why this answer is correct

The correct answer is A. \(k\le9\). For real roots \(D\ge0\) is required. From \(36-4k\ge0\), we get \(k\le9\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\ge0\) चाहिए। \(36-4k\ge0\) से \(k\le9\) मिलता है।

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Question 16/23 Medium Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 32

समीकरण \(x^2+4x+k=0\) के वास्तविक मूल होने के लिए (k) के बारे में कौन सी शर्त सही है?

For \(x^2+4x+k=0\) to have real roots, which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

A. \(k\le4\)

Step 1

Concept

For real roots \(D\ge0\) is required. From \(16-4k\ge0\), we get \(k\le4\).

Step 2

Why this answer is correct

The correct answer is A. \(k\le4\). For real roots \(D\ge0\) is required. From \(16-4k\ge0\), we get \(k\le4\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\ge0\) चाहिए। \(16-4k\ge0\) से \(k\le4\) मिलता है।

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Question 17/23 Medium Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 31

समीकरण \(x^2+2x+k=0\) के वास्तविक मूल होने के लिए (k) के बारे में कौन सी शर्त सही है?

For \(x^2+2x+k=0\) to have real roots, which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

A. \(k\le1\)

Step 1

Concept

For real roots \(D\ge0\) is required. From \(4-4k\ge0\), we get \(k\le1\).

Step 2

Why this answer is correct

The correct answer is A. \(k\le1\). For real roots \(D\ge0\) is required. From \(4-4k\ge0\), we get \(k\le1\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\ge0\) चाहिए। \(4-4k\ge0\) से \(k\le1\) मिलता है।

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Question 18/23 Easy Mathematics Quadratic Equations Roots of a Quadratic Equation Class 10 Level 31

किस स्थिति में द्विघात समीकरण के वास्तविक मूल होते हैं?

In which condition does a quadratic equation have real roots?

Explanation opens after your attempt
Correct Answer

B. \(D\ge 0\)

Step 1

Concept

For real roots \(D\ge 0\) is required. If (D<0) there are no real roots.

Step 2

Why this answer is correct

The correct answer is B. \(D\ge 0\). For real roots \(D\ge 0\) is required. If (D<0) there are no real roots.

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\ge 0\) होना चाहिए। यदि (D<0) हो तो वास्तविक मूल नहीं मिलते।

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Question 19/23 Expert Mathematics Quadratic Equations Introduction to Quadratic Equations Class 10 Level 30

समीकरण \(x^2+2px+49=0\) के वास्तविक मूल होने की शर्त कौन-सी है?

What is the condition for \(x^2+2px+49=0\) to have real roots?

Explanation opens after your attempt
Correct Answer

A. \(p\leq -7\) या \(p\geq7\)\(p\leq -7\) or \(p\geq7\)

Step 1

Concept

For real roots, \(D\geq0\) is required. Here \(4p^2-196\geq0\), so \(p\leq-7\) or \(p\geq7\).

Step 2

Why this answer is correct

The correct answer is A. \(p\leq -7\) या \(p\geq7\) / \(p\leq -7\) or \(p\geq7\). For real roots, \(D\geq0\) is required. Here \(4p^2-196\geq0\), so \(p\leq-7\) or \(p\geq7\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\geq0\) होना चाहिए। यहाँ \(4p^2-196\geq0\), इसलिए \(p\leq-7\) या \(p\geq7\)।

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Question 20/23 Expert Mathematics Quadratic Equations Introduction to Quadratic Equations Class 10 Level 29

समीकरण \(x^2+2px+36=0\) के वास्तविक मूल होने की शर्त कौन-सी है?

What is the condition for \(x^2+2px+36=0\) to have real roots?

Explanation opens after your attempt
Correct Answer

A. \(p\leq -6\) या \(p\geq6\)\(p\leq -6\) or \(p\geq6\)

Step 1

Concept

For real roots, \(D\geq0\) is required. Here \(4p^2-144\geq0\), so \(p\leq-6\) or \(p\geq6\).

Step 2

Why this answer is correct

The correct answer is A. \(p\leq -6\) या \(p\geq6\) / \(p\leq -6\) or \(p\geq6\). For real roots, \(D\geq0\) is required. Here \(4p^2-144\geq0\), so \(p\leq-6\) or \(p\geq6\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\geq0\) होना चाहिए। यहाँ \(4p^2-144\geq0\), इसलिए \(p\leq-6\) या \(p\geq6\)।

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Question 21/23 Expert Mathematics Quadratic Equations Introduction to Quadratic Equations Class 10 Level 28

समीकरण \(x^2+2px+25=0\) के वास्तविक मूल होने की शर्त कौन-सी है?

What is the condition for \(x^2+2px+25=0\) to have real roots?

Explanation opens after your attempt
Correct Answer

A. \(p\leq -5\) या \(p\geq5\)\(p\leq -5\) or \(p\geq5\)

Step 1

Concept

For real roots, \(D\geq0\) is needed. Here \(4p^2-100\geq0\), so \(p\leq-5\) or \(p\geq5\).

Step 2

Why this answer is correct

The correct answer is A. \(p\leq -5\) या \(p\geq5\) / \(p\leq -5\) or \(p\geq5\). For real roots, \(D\geq0\) is needed. Here \(4p^2-100\geq0\), so \(p\leq-5\) or \(p\geq5\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\geq0\) चाहिए। यहाँ \(4p^2-100\geq0\), इसलिए \(p\leq-5\) या \(p\geq5\)।

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Question 22/23 Hard Mathematics Quadratic Equations Introduction to Quadratic Equations Class 10 Level 30

समीकरण \(x^2+2kx+16=0\) के वास्तविक मूल होने की शर्त कौन-सी है?

What is the condition for \(x^2+2kx+16=0\) to have real roots?

Explanation opens after your attempt
Correct Answer

A. \(k\leq -4\) या \(k\geq 4\)\(k\leq -4\) or \(k\geq 4\)

Step 1

Concept

For real roots, \(D\geq0\) is needed. Here \(4k^2-64\geq0\), so \(k\leq-4\) or \(k\geq4\).

Step 2

Why this answer is correct

The correct answer is A. \(k\leq -4\) या \(k\geq 4\) / \(k\leq -4\) or \(k\geq 4\). For real roots, \(D\geq0\) is needed. Here \(4k^2-64\geq0\), so \(k\leq-4\) or \(k\geq4\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\geq0\) चाहिए। यहाँ \(4k^2-64\geq0\), इसलिए \(k\leq-4\) या \(k\geq4\)।

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Question 23/23 Hard Mathematics Quadratic Equations Introduction to Quadratic Equations Class 10 Level 29

समीकरण \(x^2+2kx+9=0\) के वास्तविक मूल होने की शर्त कौन-सी है?

What is the condition for \(x^2+2kx+9=0\) to have real roots?

Explanation opens after your attempt
Correct Answer

A. \(k\leq -3\) या \(k\geq 3\)\(k\leq -3\) or \(k\geq 3\)

Step 1

Concept

For real roots, \(D\geq0\) is needed. Here \(4k^2-36\geq0\), so \(k\leq-3\) or \(k\geq3\).

Step 2

Why this answer is correct

The correct answer is A. \(k\leq -3\) या \(k\geq 3\) / \(k\leq -3\) or \(k\geq 3\). For real roots, \(D\geq0\) is needed. Here \(4k^2-36\geq0\), so \(k\leq-3\) or \(k\geq3\).

Step 3

Exam Tip

वास्तविक मूलों के लिए \(D\geq0\) चाहिए। यहाँ \(4k^2-36\geq0\), इसलिए \(k\leq-3\) या \(k\geq3\)।

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