Quiz - 1 For Class X (Quadratic Equation)
10 Questions
| Total Attempts: 231
Questions and Answers
- 1.If the equation x2 + 4x + k = 0 has a real and distinct roots, then
- A.
K < 4
- B.
K > 4
- C.
K ≥ 4
- D.
K ≤4
- 2.If the equation x2 - ax + 1 = 0 has two distinct roots, then
- A.
|a|= 2
- B.
|a| < 2
- C.
|a| > 2
- D.
None of these
- 3.If ax2 + bx + c = 0 has equal roots, then c= ?
- A.
-b/2a
- B.
B/2a
- C.
- b2/2a
- D.
B2/4a
- 4.If x = 1 is a common root of ax2 + ax + 2 = 0 and x2 + x + b = 0 then ab = ?
- A.
1
- B.
2
- C.
4
- D.
3
- 5.If a and b are roots of the equation x2 + ax + b = 0, then a + b = ?
- A.
1
- B.
2
- C.
- 2
- D.
- 1
- 6.If one root of the equation whose one root is 2 and sum of whose roots is zero, is
- A.
X2 + 4 = 0
- B.
X2 - 4 = 0
- C.
4x2 - 1 = 0
- D.
X2 - 2 = 0
- 7.If y = 1 is a common root of the equations ay2 + ay + 3 = 0 and y2 + y + b = 0 then ab equals ?
- A.
3
- B.
-7/2
- C.
6
- D.
-3
- 8.The values of k for which the quadratic equation 16x2 + 4 kx + 9 = 0 has real and equal roots are
- A.
6, -1/6
- B.
36, -36
- C.
6, -6
- D.
3/4, - 3/4
- 9.Find two numbers whose sum is 24 and product is 143
- A.
13, 11
- B.
12, 12
- C.
8, 16
- D.
None of these
- 10.Find two consecutive odd positive integers sum of whose squares is 290
- A.
13, 15
- B.
11, 13
- C.
7, 9
- D.
5, 7
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