Quadratic Equations and Simultaneous Equations MCQs - Math Test 9

MCQ. Value of b2 - 4ac determines nature of roots, for not-real roots, b2 - 4ac is:

  1. lesser than 0.
  2. equal to 0.
  3. greater than 0.
  4. None of above.

A

MCQ. Sum of roots of a quadratic equation is equal to:

  1. -b ⁄ 2a.
  2. -2b ⁄ a.
  3. -b ⁄ a.
  4. b ⁄ a.

C

MCQ. Length of line joining two points (x1, y1) and (x2, y2) is:

  1. (x2 - x1) + (y2 - y1).
  2. ?((x2 - x1) + (y2 - y1)).
  3. ?((x2 - x1)2 + (y2 - y1)2).
  4. (y2 - y1) ⁄ (x2 - x1).

C

MCQ. Coordinates of midpoint of line joining two points (x1, y1) and (x2, y2) are:

  1. ((x2 - x1) ⁄ 2, (y2 - y1) ⁄ 2).
  2. ((x2 + x1) ⁄ 2, (y2 + y1) ⁄ 2).
  3. ((x2 - x1), (y2 - y1)).
  4. ((x2 + x1), (y2 + y1)).

B

MCQ. Coordinates of midpoint of line joining two points (1, 2) and (4, 8) are:

  1. (2.5, 10).
  2. (5, 5).
  3. (5, 10).
  4. (2.5, 5).

D

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