Question

1. If ½ is a root of quadratic equation x2 +kx – 5/x = 0, then the value of k is (a) 2 (b) -2 (c) ¼ (d) ½
2. Which of the following is not a quadratic equation? (a) 2(x-1)2 = 4x2 -2x +1 (b) (x2+2x)2 =x4 +3+ 4x3 (c) (√2 x + √3 ) 2 +x2 = 3x2 – 5x (d) 2x –x 2 = x2 + 5
3. If one root of the equation px2 – 14x + 8 = 0 is six times the other, then p is equal to (a) 2 (b) 3 (c) 1 (d) None of these 4. The roots of the quadratic equation 2x2 – x- 6 =0 are (a) -2, 3/2 (b) 2, - 3/2 (c) -2, -3/2 (d) 2, 3/2
5. Value of k for which the quadratic equation 2x2 – kx + k = 0 has equal roots is (a) 0 only (b) 4 (c) 8 only (d) 0, 8
6. If discrimination =0, then root of a quadratic equation (a) real and equal (b) no real roots (c) real and distinct (d) none 7. What is the middle term of quadratic equation whose solutions are -4 and -5 ? (a) 2ox (b) -20x (c) 9x (d) -9x
8. If the roots of ax2 + bx + c =0 are equal in magnitude but opposite insign, then (a) a=c (b) b=0 (c) c =o (d) None of these 9. 30th term of AP : 1, 7, 4………..is: (a) 97 (b) 77 (c) -77 (d) -8
10. The sum of first 5 multiple of 3 is: (a) 45 (b) 65 (c) 75 (d) 90
11. If4th and 8th term of an AP are 11 and 23 respectively, then common difference is (a) 5 (b) 4 (c) -6 (d) 3
12. If the common difference of an AP whose a18 – a13 ? (a) 20 (b) 25 (c) 30 (d) 5
13. In an AP if a=1, an =20 and Sn = 399, then n is (a) 19 (b) 21 (c) 38 (d) 42
14. If the sum of first n even natural numbers is equal to K times the sum of first n odd natural numbers then K= (a) (n+1)/n (b) (n-1) / n (c) (n+1)/2n (d) 1/n
15. If the nth term of an AP is (2n+1) then the sum of its first three terms is (a) 6n+3 (b) 15 (c) 12 (d) 21​

Answer 1

Answer:

789849

Step-by-step explanation:

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