Commerce (English Medium)

Science (English Medium)

Arts (English Medium)

Academic Year: 2015-2016

Date & Time: 14th March 2016, 10:30 am

Duration: 3h

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**(i) **All questions are compulsory.

**(ii) **Please check that this question paper contains 26 questions.

**(iii)** Questions 1 - 6 in Section A are very short-answer type questions carrying 1 mark each.

**(iv)** Questions 7 - 19 in Section B are long-answer I type questions carrying 4 marks each.

**(v)** Questions 20 - 26 in Section C are long-answer II type questions carrying 6 marks each.

Write the value of `|(a-b, b- c, c-a),(b-c, c-a, a-b),(c-a, a-b, b-c)|`

Chapter: [0.04] Determinants

If A = `((1, -2, 3),(-4,2,5)) and B = ((2,3),(4,5),(2,1))` and BA = (b_{ij}), find b_{21} + b_{32}.

Chapter: [0.03] Matrices

Write the number of all possible matrices of order 2 x 3 with each entry 1 or 2.

Chapter: [0.03] Matrices

Write the coordinates of the point which is the reflection of the point (α, β, γ) in the XZ-plane.

Chapter: [0.11] Three - Dimensional Geometry

Find the position vector of the point which divides the join of points with position vectors `vec"a" + 3vec"b" and vec"a"- vec"b"` internally in the ratio 1 : 3.

Chapter: [0.1] Vectors

If `|vec"a"| = 4, |vec"b"| = 3` and `vec"a".vec"b" = 6 sqrt(3)`, then find the value of `|vec"a" xx vec"b"|`.

Chapter: [0.1] Vectors

Solve for x : `tan^-1 ((2-"x")/(2+"x")) = (1)/(2)tan^-1 ("x")/(2), "x">0.`

Chapter: [0.02] Inverse Trigonometric Functions

Prove that : `2sin^-1 (3/5) -tan^-1 (17/31) = pi/4.`

Chapter: [0.05] Continuity and Differentiability

On her birthday Seema decided to donate some money to children of an orphanage home. If there were 8 children less, everyone would have got ₹ 10 more. However, if there were 16 children more, everyone would have got ₹ 10 less. Using the matrix method, find the number of children and the amount distributed by Seema. What values are reflected by Seema’s decision?

Chapter: [0.04] Determinants

If `"x" = "e"^(cos2"t") "and" "y" = "e"^(sin2"t")`, prove that `(d"y")/(d"x") = - ("y"log"x")/("x"log"y")`.

Chapter: [0.05] Continuity and Differentiability

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Verify Mean value theorem for the function f(x) = 2sin x + sin 2x on [0, π].

Chapter: [0.05] Continuity and Differentiability

Show that the function f given by:

`f(x)={((e^(1/x)-1)/(e^(1/x)+1),"if",x,!=,0),(-1,"if",x,=,0):}"`

is discontinuous at x = 0.

Chapter: [0.05] Continuity and Differentiability

Find the equation of the tangent line to the curve `"y" = sqrt(5"x" -3) -5`, which is parallel to the line `4"x" - 2"y" + 5 = 0`.

Chapter: [0.06] Applications of Derivatives

Evaluate: `int_1^5{|"x"-1|+|"x"-2|+|"x"-3|}d"x"`.

Chapter: [0.07] Integrals

Evaluate: `int_0^pi ("x"sin "x")/(1+ 3cos^2 "x") d"x"`.

Chapter: [0.07] Integrals

Find : `int_ (2"x"+1)/(("x"^2+1)("x"^2+4))d"x"`.

Chapter: [0.07] Integrals

Find: `int_ (3"x"+ 5)sqrt(5 + 4"x"-2"x"^2)d"x"`.

Chapter: [0.07] Integrals

Solve the differential equation : `"x"(d"y")/(d"x") + "y" - "x" + "xy"cot"x" = 0; "x" != 0.`

Chapter: [0.09] Differential Equations

Solve the differential equation : `("x"^2 + 3"xy" + "y"^2)d"x" - "x"^2 d"y" = 0 "given that" "y" = 0 "when" "x" = 1`.

Chapter: [0.09] Differential Equations

Find the angle between the vectors `vec"a" + vec"b" and vec"a" -vec"b" if vec"a" = 2hat"i"-hat"j"+3hat"k" and vec"b" = 3hat"i" + hat"j"-2hat"k", and"hence find a vector perpendicular to both" vec"a" + vec"b" and vec"a" - vec"b"`.

Chapter: [0.1] Vectors

Show that the lines `("x"-1)/(3) = ("y"-1)/(-1) = ("z"+1)/(0) = λ and ("x"-4)/(2) = ("y")/(0) = ("z"+1)/(3)` intersect. Find their point of intersection.

Chapter: [0.11] Three - Dimensional Geometry

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A committee of 4 students is selected at random from a group consisting of 7 boys and 4 girls. Find the probability that there are exactly 2 boys in the committee, given that at least one girl must be there in the committee.

Chapter: [0.13] Probability

A random variable X has the following probability distribution :

X |
0 | 1 | 2 | 3 | 4 | 5 | 6 |

P(X) |
C | 2C | 2C | 3C | C^{2} |
2C^{2} |
7C^{2}+C |

Find the value of C and also calculate the mean of this distribution.

Chapter: [0.13] Probability

Show that the relation R defined by (a, b)R(c,d) ⇒ a + d = b + c on the A x A , where A = {1, 2,3,...,10} is an equivalence relation. Hence write the equivalence class [(3, 4)]; a, b, c,d ∈ A.

Chapter: [0.01] Relations and Functions

Solve for x : `|("a"+"x","a"-"x","a"-"x"),("a"-"x","a"+"x","a"-"x"),("a"-"x","a"-"x","a"+"x")| = 0`, using properties of determinants.

Chapter: [0.04] Determinants

Using elementary row operations, find the inverse of the matrix A = `((3, 3,4),(2,-3,4),(0,-1,1))` and hence solve the following system of equations : 3x - 3y + 4z = 21, 2x -3y + 4z = 20, -y + z = 5.

Chapter: [0.03] Matrices [0.04] Determinants

Show that height of the cylinder of greatest volume which can be inscribed in a right circular cone of height h and semi-vertical angle α is one-third that of the cone and the greatest volume of the cylinder is `(4)/(27) pi"h"^3 tan^2 α`.

Chapter: [0.06] Applications of Derivatives

Find the intervals in which the function `f("x") = (4sin"x")/(2+cos"x") -"x";0≤"x"≤2pi` is strictly increasing or strictly decreasing.

Chapter: [0.06] Applications of Derivatives

Using integration find the area of the triangle formed by negative x-axis and tangent and normal to the circle `"x"^2 + "y"^2 = 9 "at" (-1,2sqrt2)`.

Chapter: [0.08] Applications of the Integrals

Find the coordinates of the foot of perpendicular and perpendicular distance from the point P(4,3,2) to the plane x + 2y + 3z = 2. Also find the image of P in the plane.

Chapter: [0.11] Three - Dimensional Geometry

A, B and C throw a pair of dice in that order alternatively till one of them gets a total of 9 and wins the game. Find their respective probabilities of winning, if A starts first.

Chapter: [0.13] Probability

A company manufactures two types of cardigans: type A and type B. It costs ₹ 360 to make a type A cardigan and ₹ 120 to make a type B cardigan. The company can make at most 300 cardigans and spend at most ₹ 72000 a day. The number of cardigans of type B cannot exceed the number of cardigans of type A by more than 200. The company makes a profit of ₹ 100 for each cardigan of type A and ₹ 50 for every cardigan of type B.

Formulate this problem as a linear programming problem to maximize the profit to the company. Solve it graphically and find the maximum profit.

Chapter: [0.12] Linear Programming

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