IITJEE - Mathematics 2010-i

IIT JEE –Past papersMATHEMATICS- UNSOLVED PAPER - 2010

SECTION – ISingle Correct Answer TypeThis Section contains 8 multiple choice questions. Each question has four choices A), B), C) and D) out of which ONLY ONE is correct.

01ProblemLet ω be a complex cube root of unity with ω ≠ 1. A fair die is thrown three times. If r1, r2 and r3 are the numbers obtained on the die, then the probability that ωr1 + ωr2 + ωr3 = 0 is1/181/92/91/36

Problem02Let P, Q, R and S be the points on the plane with position vectors And respectively. The quadrilateral PQRS must be aparallelogram, which is neither a rhombus nor a rectanglesquarerectangle, but not a squarerhombus, but not a square

Problem03The number of 3 × 3 matrices A whose entries are either 0 or 1 and for which the system has exactly two distinct solutions, is0 29 − 1168 2

Problem04The value of is01/121/241/64

Problem05Let p and q be real numbers such that p ≠ 0, p3 ≠ q and p3 ≠ − q. If α and β are nonzero complex numbers satisfying α + β = − p and α3 + β3 = q, then a quadratic equation having α/β and β/α as its roots is(p3 + q)x2 − (p3 + 2q)x + (p3 + q) = 0(p3 + q)x2 − (p3 − 2q)x + (p3 + q) = 0(p3 − q)x2 − (5p3− 2q)x + (p3 − q) = 0(p3 − q)x2 − (5p3 + 2q)x + (p3 − q) = 0

Problem06Let f, g and h be real-valued functions defined on the interval [0, 1] by f x = ex2 + e−x 2, g x = x = ex2 + e−x 2 and h (x) = x = ex2 + e−x 2. If a, b and c denote, respectively, the absolute maximum of f, g and h on [0, 1], thena = b and c ≠ b a = c and a ≠ ba ≠ b and c ≠ b a = b = c

Problem07If the angles A, B and C of a triangle are in an arithmetic progression and if aand c denote the lengths of the sides opposite to A, B and C respectively, thenthe value of the expression a/c sin 2C+c/a sin 2A is1/2.1.

08ProblemEquation of the plane containing the straight line and perpendicular to the plane containing the straight lines and isx + 2y − 2z = 03x + 2y − 2z = 0x − 2y + z = 0 5x + 2y − 4z = 0

SECTION – IIMultiple Answer TypeThis section contains 5 multiple choice questions. Each question has four choices A), B), C) and D) out of which ONE OR MORE may be correct.

Problem09Let z1 and z2 be two distinct complex numbers and let z = (1 − t) z1 + tz2for some real number t with 0 < t < 1. If Arg (w) denotes the principal argument of a non-zero complex number |z − z1| + |z − z2| = |z1 − z2| Arg (z − z1) = Arg (z − z2)c.d. Arg (z − z1) = Arg (z2 − z1)

Problem10The value(s) of is area. 22/7-πb. 2/105c. 0d. 71/15-3 π/2

Problem11Let ABC be a triangle such that ∠ACB = π/6 and let a, b and c denote the lengths of the sides opposite to A, B and C respectively. The value(s) of x for which a = x2 + x + 1, b = x2 − 1 and c = 2x + 1 is (are)-(2+ )1+ 2+4

12ProblemLet A and B be two distinct points on the parabola y2 = 4x. If the axis of the parabola touches a circle of radius r having AB as its diameter, then the slope of the line joining A and B can be -1/r1/r2/r-2/r

Problem13Let f be a real-valued function defined on the interval (0, ∞) by Then which of the following statement(s) is (are) true? f ″(x) exists for all x ∈ (0, ∞)f′(x) exists for all x ∈ (0, ∞) and f′ is continuous on (0, ∞), but not differentiable on (0, ∞)there exists α > 1 such that |f′(x)| < |f(x)| for all x ∈ (α, ∞)there exists β > 0 such that |f(x)| + |f′(x)| ≤ β for all x ∈ (0, ∞)

SECTION – IIIParagraph TypeThis section contains 2 paragraphs. Based upon one of paragraphs 2 multiple choice questions and based on the other paragraph 3 multiple choice questions have to be answered. Each of these questions has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.

Paragraph for Question Nos. 14 to 15The circle x2 + y2 − 8x = 0 and hyperbola intersect at the points A and B

Problem14Equation of a common tangent with positive slope to the circle as well as to the hyperbola is2x − − 20 = 0 2x − + 4 = 03x − 4y + 8 = 04x − 3y + 4 = 0

Problem15Equation of the circle with AB as its diameter isx2 + y2 − 12x + 24 = 0 x2 + y2 + 12x + 24 = 0x2 + y2 + 24x − 12 = 0 x2 + y2 − 24x − 12 = 0

Paragraph for Question Nos. 16 and 18Let p be an odd prime number and Tp be the following set of 2 × 2 matrices :

Problem16The number of A in Tp such that A is either symmetric or skew-symmetric or both, and det(A) divisible by p is(p − 1)22(p − 1)(p − 1) 2 + 1 2p − 1

17ProblemThe number of A in Tp such that the trace of A is not divisible by p but det (A) is divisible by p is [Note: The trace of a matrix is the sum of its diagonal entries.](p − 1) (p2 − p + 1) p3 − (p − 1) 2(p − 1) 2(p − 1) (p2− 2)

Problem18The number of A in Tp such that det (A) is not divisible by p is2p2p3 − 5pp3 − 3pp3 − p2

SECTION – IVInteger Answer TypeThis section contains TEN questions. The answer to each question is a single digit integer ranging from 0 to 9. The correct digit below the question number in the ORS is to be bubbled.

Problem19Let Sk, k = 1, 2, ….. , 100, denote the sum of the infinite geometric series whose first term is and the common ratio is 1/K . Then the value of is

Problem20The number of all possible values of θ, where 0 < θ < π, for which the system of equations (y + z) cos 3θ = (xyz) sin 3θ (xyz) sin 3θ = (y + 2z) cos 3θ + y sin 3θhave a solution (x0, y0, z0) with y0z0≠ 0, is

Problem21Let f be a real-valued differentiable function on R (the set of all real numbers) such that f(1) = 1. If the y-intercept of the tangent at any point P(x, y) on the curve y = f(x) is equal to the cube of the abscissa of P, then the value of f(−3) is equal to

Problem22The number of values of θ in the interval such that for n = 0, ±1, ±2 and tanθ = cot 5θ as well as sin 2θ = cos 4θ is

Problem23The maximum value of the expression is

Problem24If and are victors in space given by and , then the value of is

Problem25The line 2x + y = 1 is tangent to the hyperbola If this line passes through the point of intersection of the nearest directrix and the x-axis, then the eccentricity of the hyperbola is

Problem26If the distance between the plane Ax − 2y + z = d and the plane containing the lines is , then |d| is

Problem27For any real number x, let |x| denote the largest integer less than or equal to x. Let f be a real valued function defined on the interval [−10, 10] by

Problem28Let ω be the complex number cos Then the number of distinct complex numbers z satisfying is equal to

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IITJEE - Mathematics 2010-i

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