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42. y = mx + c is ---- -.. of a straight line. (a) general form (b) slope form (c) Intercept form (d) equation 43 A demand function is - (a) continuous function (b) constant function (c) decreasing function (d) increasing function 44. A straight line and a parabola intersect at : (a)2 points (b): point (c)no point (d)at origin 45. The common root of x2 - 5x + 6 = 0 and 3x2 - 5x - 2 = 0 is : (a) 1 (b)2 (c)3 (d)4. 46. The value of the determinant |0 b o is equal to : 2 0 b] 0 (a)abc (babe - b ()abc - b2 (d)abc - b3 47. In a determinant if two rows or columns are identical it's value is : (@)0 b)1 (0)-1 (d)none of these 48. The solutions of the equations by determinants method is called: (a) inverse method (b)rank method (c)cramer's rule (d)none of these 49. When two rows (or columns) are interchanged the value of the determinant: (a) remain unchanged (b) changed (c)changed by sign (d)none of these 50 . Which of the following is a singular matrix : () 1 21 (@12 31 51. Let B be the inverse of a matrix A having determinant 3, then the determinant of B is : (a) 9 (b) 3 (c) 1/3 (d) 0. 52. The matrix A = 0 0 0 is : (a) Symmetric (b) Diagonal (c) Skew Symmetric (d) Triangular. 53. A square matrix A is said to be skew symmetric, if; (a) A = AT (b) A = A-1 (C) A = -AT (d) A = -A-129. X" + X" = : a)xmen (b) xmn (c) Xn (d) xm-n 30 Xo (a) X (b) 0 (c) 1 (d) None of these 31 8-2/3 ......." (a) 8 (b) 2 (d)= 32 Logarithm of 25 to the base 5 is: (a) 5 (b) 125 (c) 2 33.Logarithm of unity to any base is : (a) Unity (b) co (c) zero (d) None of these 34 410916) = (a) 1 (b) log 1 (c) log168 (d)4 35 If logav = -, then the value of a= -....-- (a) 3 (b) (c) 9 (d) 31/4 36 If logast =3 then = -.......". (a) 2 (b) 4 (c) 3 (d) 12 37. The equation X2 + 4 =0 is a : (a) Cubic equation (b) Simple equation (c)Quadratic equation (d)Nome of these. 38. The solution of the equation = > (a) 6 (b) 12 (c) 8 (d) 16 39. The value of the determinant 65 5] is (a) 2 (b) 38 (c) -2 (d) -38 40 If the rows and columns of a determinant are interchanged , then the determinant value --- (a) remains the same (b) the sign of the value change (c) becomes zero (d) none of these. 41. The equation of a line having slope "b' and y-intercept "a' is given by: (a) y =b + ax (b)y =x+ ab (