Class 10 Maths MCQs on Relationship Between Zeros and Coefficients
CBSE Class 10 Mathematics – Relationship Between Zeros & Coefficients (MCQs)
Chapter 2: Polynomials
Based on NCERT Curriculum
As per Latest CBSE Board Examination Pattern
1. If α and β are the zeroes of ax² + bx + c, then α + β equals:
Correct Answer: B. −b/a
Explanation: For quadratic polynomial ax²+bx+c, sum of zeroes = −(coefficient of x)/(coefficient of x²) = −b/a.
Explanation: For quadratic polynomial ax²+bx+c, sum of zeroes = −(coefficient of x)/(coefficient of x²) = −b/a.
2. If α and β are zeroes of ax² + bx + c, then αβ equals:
Correct Answer: B. c/a
Explanation: Product of zeroes = constant term / coefficient of x² = c/a.
Explanation: Product of zeroes = constant term / coefficient of x² = c/a.
3. For polynomial 2x² − 5x + 3, sum of zeroes is:
Correct Answer: A. 5/2
Explanation: Sum = −b/a = −(−5)/2 = 5/2.
Explanation: Sum = −b/a = −(−5)/2 = 5/2.
4. For polynomial x² − 7x + 10, product of zeroes is:
Correct Answer: B. 10
Explanation: Product = c/a = 10/1 = 10.
Explanation: Product = c/a = 10/1 = 10.
5. If sum of zeroes is 3 and product is 2, quadratic polynomial is:
Correct Answer: A
Explanation: Required polynomial: x² − (sum)x + product = x² − 3x + 2.
Explanation: Required polynomial: x² − (sum)x + product = x² − 3x + 2.
6. If one zero is 2 and sum of zeroes is 5, the other zero is:
Correct Answer: A
Explanation: Let other zero be β. 2 + β = 5 ⇒ β = 3.
Explanation: Let other zero be β. 2 + β = 5 ⇒ β = 3.
7. If product of zeroes is −6 and one zero is 3, other zero is:
Correct Answer: B
Explanation: 3 × β = −6 ⇒ β = −2.
Explanation: 3 × β = −6 ⇒ β = −2.
8. If α and β are zeroes of x² + 4x + 3, then α + β equals:
Correct Answer: B
Explanation: Sum = −b/a = −4.
Explanation: Sum = −b/a = −4.
9. If α and β are zeroes of x² − 9, then αβ equals:
Correct Answer: A
Explanation: Product = c/a = −9.
Explanation: Product = c/a = −9.
10. If sum = 0 and product = −4, polynomial is:
Correct Answer: C
Explanation: Polynomial = x² − (sum)x + product = x² − 0x − 4.
Explanation: Polynomial = x² − (sum)x + product = x² − 0x − 4.
11. If α, β are zeroes of 3x² + 2x − 1, then α + β equals:
Correct Answer: A
Explanation: Sum = −b/a = −2/3.
Explanation: Sum = −b/a = −2/3.
12. For polynomial 4x² − 8x + 3, product of zeroes is:
Correct Answer: A
Explanation: Product = c/a = 3/4.
Explanation: Product = c/a = 3/4.
13. If sum = −5 and product = 6, polynomial is:
Correct Answer: B
Explanation: x² − (−5)x + 6 = x² + 5x + 6.
Explanation: x² − (−5)x + 6 = x² + 5x + 6.
14. If α = 1, β = 2, polynomial is:
Correct Answer: A
Explanation: Sum = 3, Product = 2 ⇒ x² − 3x + 2.
Explanation: Sum = 3, Product = 2 ⇒ x² − 3x + 2.
15. If α + β = 7 and αβ = 10, quadratic polynomial is:
Correct Answer: A
Explanation: Polynomial = x² − (sum)x + product.
Explanation: Polynomial = x² − (sum)x + product.
16. If αβ = 0, one zero must be:
Correct Answer: A
Explanation: Product zero means at least one zero is 0.
Explanation: Product zero means at least one zero is 0.
17. For monic quadratic polynomial, coefficient of x² is:
Correct Answer: B
Explanation: Monic polynomial has leading coefficient 1.
Explanation: Monic polynomial has leading coefficient 1.
18. If α + β = 0, zeroes are:
Correct Answer: B
Explanation: If sum is zero, numbers are opposites (e.g., 3 and −3).
Explanation: If sum is zero, numbers are opposites (e.g., 3 and −3).
19. If product is positive and sum is negative, zeroes are:
Correct Answer: B
Explanation: Product positive ⇒ same sign; sum negative ⇒ both negative.
Explanation: Product positive ⇒ same sign; sum negative ⇒ both negative.
20. If product is negative, zeroes are:
Correct Answer: C
Explanation: Product negative means signs are opposite.
Explanation: Product negative means signs are opposite.
