Selected MCQ

Current Question
If discriminant is negative, roots are ____.
  • A. Real
  • B. Equal
  • C. Imaginary
  • D. Rational
Correct Answer: C
Explanation:
D < 0 → complex roots.
Related Question 1
If discriminant is positive, roots are ____.
  • A. Equal
  • B. Real and distinct
  • C. Imaginary
  • D. Complex equal
Correct Answer: B
Explanation:
D > 0 → distinct real roots.
Related Question 2
If roots of Equation are equal, the discriminant is ____.
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Infinite
Correct Answer: C
Explanation:
Equal roots when D = 0.
Related Question 3
Sum and product of roots of Equation x² + 20x + 3 = 0 are ____.
  • A. 10, 3
  • B. -10, 3
  • C. -20, 3
  • D. -10, -3
Correct Answer: C
Explanation:
Sum = −b/a, product = c/a.
Related Question 4
The roots of Equation 3x² − 12x + 10 = 0 are ____.
  • A. Rational and unequal
  • B. Complex
  • C. Real and equal
  • D. Irrational and unequal
Correct Answer: D
Explanation:
Discriminant >0 but not a perfect square.
Related Question 5
If roots of Equation are 2 and 3, Equation is ____.
  • A. x² − 5x + 6 = 0
  • B. x² + 5x + 6 = 0
  • C. x² − 6x + 5 = 0
  • D. x² + 6x + 5 = 0
Correct Answer: A
Explanation:
Sum = 5, product = 6.