Q. Choose the correct answers for the following questions.
(1) Which one is the quadratic equation ?
(A) |
(B) x(x + 5) = 2 |
(C) n – 1 = 2n |
(D) |
(2) Out of the following equations which one is not a quadratic equation ?
(A) x2 + 4x = 11 + x2 |
(B) x2 = 4x |
(C) 5x2 = 90 |
(D) 2x – x2 = x2 + 5 |
(3) The roots of x
2 + kx + k = 0 are real and equal, find k.
(A) 0 |
(B) 4 |
(C) 0 or 4 |
(D) 2 |
(4) For
find the value of the discriminant.
(A) –5 |
(B) 17 |
(C) |
(D) |
(5) Which of the following quadratic equations has roots 3,5 ?
(A) x2 – 15x + 8 = 0 |
(B) x2 – 8x + 15 = 0 |
(C) x2 + 3x + 5 = 0 |
(D) x2 + 8x – 15 = 0 |
(6) Out of the following equations, find the equation having the sum of its roots –5.
(A) 3x2 – 15x + 3 = 0 |
(B) x2 – 5x + 3 = 0 |
(C) x2 + 3x – 5 = 0 |
(D) 3x2 + 15x + 3 = 0 |
(7)
which of the following statement is true for this given equation ?
(A) Real and uneual roots |
(B) Real and equal roots |
(C) Roots are not real |
(D) Three roots. |
(8) One of the roots of equation x
2 + mx – 5 = 0 is 2; find m.
(A) –2 |
(B) |
(C) |
(D) 2 |