Practice Questions

Q11.Let the position vectors of three vertices of a triangle be 4→p + →q −3→r, −5→p + →q + 2→r and 2→p−→q+ 2→r. If the →p+→q+→r position vectors of the orthocenter and the circumcenter of the triangle are and α→p + β→q + γ→r 4 respectively, then α + 2β + 5γ is equal to : (1) 3 (2) 4 (3) 1 (4) 6 → →

Q11.The area of the region {(x, y) : x2 + 4x + 2 ≤y ≤|x + 2|} is equal to (1) 7 (2) 5 (3) 24/5 (4) 20/3

Q11.Let f(x) = loge x and g(x) = x4−2x3+3x2−2x+22x2−2x+1 . Then the domain of (1) [0, ∞) (2) [1, ∞) (3) (0, ∞) (4) R

Q11.Let the area enclosed between the curves |y| = 1 −x2 and x2 + y2 = 1 be α. If 9α = βπ + γ; β, γ are integers, then the value of |β −γ| equals. (1) 27 (2) 33 (3) 15 (4) 18

Q11.Using the principal values of the inverse trigonometric functions, the sum of the maximum and the minimum is : values of 16 ((sec−1 x)2 + (cosec−1 x)2) (1) 24π2 (2) 22π2 (3) 31π2 (4) 18π2

Q11.Let A = [aij] = [ log5log51288 log4log4255 ] . If Aij is the cofactor of aij, Cij = ∑2k=1 aikAjk, 1 ≤i, j ≤2, and C = [Cij], then 8|C| is equal to : (1) 288 (2) 222 (3) 242 (4) 262

Q11.Let A(x, y, z) be a point in xy-plane, which is equidistant from three points (0, 3, 2), (2, 0, 3) and ( 0, 0, 1 ). Let B = (1, 4, −1) and C = (2, 0, −2). Then among the statements (S1) : △ABC is an isosceles right angled triangle, and (S2) : the area of △ABC is 9√22 , (1) both are true (2) only (S2) is true (3) only (S1) is true (4) both are false

Q11.If limx→∞(( 1−e ) ( e − 1+x )) = α, then the value of 1+loge α equals : (1) e−1 (2) e2 (3) e−2 (4) e

Q12.For positive integers n, if 4an = (n2 + 5n + 6) and Sn = ∑nk=1 ( ak1 ), then the value of (1) 540 (2) 675 (3) 1350 (4) 135

Q12.Let x = x(y) be the solution of the differential equation y = (x −y dxdy ) ( xy ), cos(x(2)) is equal to : (1) 1 −2(loge 2)2 (2) 1 −2 (loge 2) (3) 2 (loge 2) −1 (4) 2(loge 2)2 −1

Q12.Let |z1 −8 −2i| ≤1 and |z2 −2 + 6i| ≤2, z1, z2 ∈C . Then the minimum value of |z1 −z2| is : (1) 13 (2) 10 (3) 3 (4) 7

Q12.Let A = {1, 2, 3, 4} and B = {1, 4, 9, 16}. Then the number of many-one functions f : A →B such that 1 ∈f( A) is equal to : (1) 151 (2) 139 (3) 163 (4) 127

Q12.Let f : R →R be a twice differentiable function such that f(x + y) = f(x)f(y) for all x, y ∈R. If f ′(0) = 4a and f satisfies f ′′(x) −3af ′(x) −f(x) = 0, a > 0, then the area of the region R = {(x, y) ∣0 ≤y ≤f(ax), 0 ≤x ≤2} is: (1) e2 −1 (2) e2 + 1 (3) e4 + 1 (4) e4 −1

Q12.Let Sn = 12 + 16 + 121 + 201 + … upto n terms. If the sum of the first six terms of an A.P. with first term -p and common difference p is √2026 S2025 , then the absolute difference betwen 20th and 15th terms of the A.P. is (1) 20 (2) 90 (3) 45 (4) 25

Q12.Let →a = 3^i −^j + 2^k, b =→a× (^i −2^k) and→c= b × ^k. Then the projection of→c−2^j on →a is : (1) 2√14 (2) √14 (3) 3√7 (4) 2√7

Q12.The remainder, when 7103 is divided by 23 , is equal to : (1) 6 (2) 17 (3) 9 (4) 14

Q12.The area (in sq. units) of the region {(x, y) : 0 ≤y ≤2|x| + 1, 0 ≤y ≤x2 + 1, |x| ≤3} is (1) 80 (2) 64 3 3 (3) 32 (4) 17 3 3

Q12. (λ −1)x + (λ −4)y + λz = 5 If the system of equations λx + (λ −1)y + (λ −4)z = 7 has infinitely many solutions, then λ2 + λ is (λ + 1)x + (λ + 2)y −(λ + 2)z = 9 equal to (1) 6 (2) 10 (3) 20 (4) 12

Q13.Let f : R −{0} →(−∞, 1) be a polynomial of degree 2, satisfying f(x)f ( x1 ) = f(x) + f ( x1 ). If f(K) = −2K , then the sum of squares of all possible values of K is : (1) 7 (2) 6 (3) 1 (4) 9 and a

Q13. The number of real solution(s) of the equation x2 + 3x + 2 = min{|x −3|, |x + 2|} is : (1) 1 (2) 0 (3) 2 (4) 3

Q13.If αx + βy = 109 is the equation of the chord of the ellipse x29 + y24 = 1 , whose mid point is ( 52 , 12 ), then α + β is equal to : (1) 58 (2) 46 (3) 37 (4) 72

Q13.Suppose that the number of terms in an A.P. is 2k, k ∈N . If the sum of all odd terms of the A.P. is 40 , the sum of all even terms is 55 and the last term of the A.P. exceeds the first term by 27, then k is equal to : (1) 6 (2) 5 (3) 8 (4) 4 y+2

Q13.A spherical chocolate ball has a layer of ice-cream of uniform thickness around it. When the thickness of the ice-cream layer is 1 cm , the ice-cream melts at the rate of 81 cm3/min and the thickness of the ice-cream layer decreases at the rate of 1 cm/min. The surface area (in cm2 ) of the chocolate ball (without the ice- 4π cream layer) is : (1) 196π (2) 256π (3) 225π (4) 128π

Q13.Let f : R −{0} →R be a function such that f(x) −6f ( x1 ) = 3x35 −52 . If the limx→0 ( αx1 + f(x)) = β; α, β ∈R, then α + 2β is equal to (1) 5 (2) 3 (3) 4 (4) 6 n > 0, then I(9, 14) + I(10, 13) is

Q13.Let L1 : x−11 = y−2−1 = z−12 and L2 : x+1−1 = y−22 = 1z be two lines. Let L3 be a line passing through the point (α, β, γ) and be perpendicular to both L1 and L2 . If L3 intersects L1 , then |5α −11β −8γ| equals : (1) 20 (2) 18 (3) 25 (4) 16