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Board Paper of Class 12-Commerce 2016 Maths Delhi(SET 1) - Solutions

General Instructions :
(i) All questions are compulsory.
(ii) Please check that this Question Paper contains 26 Questions.
(iii) Marks for each question are indicated against it.
(iv) Questions 1 to 6 in Section-A are Very Short Answer Type Questions carrying one mark each.
(v) Questions 7 to 19 in Section-B are Long Answer I Type Questions carrying 4 marks each.
(vi) Questions 20 to 26 in Section-C are Long Answer II Type Questions carrying 6 marks each.
(vii) Please write down the serial number of the Question before attempting it.
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  • Question 1
    Find the maximum value of  1111  1+sin θ1111+cos θ  VIEW SOLUTION

  • Question 2
     If A is a square matrix such that A2 = I, then find the simplified value of (A – I)3 + (A + I)3 – 7A. VIEW SOLUTION

  • Question 3
    Matrix A = 02b-231   33a3-1 is given to be symmetric, find values of a and b. VIEW SOLUTION

  • Question 4
    Find the position vector of a point which divides the join of points with position vectors a-2b and 2a + b externally in the ratio 2 : 1. VIEW SOLUTION

  • Question 5
    The two vectors j^+k^ and 3i^-j+4k^ represent the two sides AB and AC, respectively of a ∆ABC. Find the length of the median through A. VIEW SOLUTION

  • Question 6
    Find the vector equation of a plane which is at a distance of 5 units from the origin and its normal vector is 2i^-3j^+6k^. VIEW SOLUTION

  • Question 7
    Prove that:




    Solve for x:

    2 tan-1cos x=tan-12cosec x VIEW SOLUTION

  • Question 8
    The monthly incomes of Aryan and Babban are in the ratio 3 : 4 and their monthly expenditures are in the ratio 5 : 7. If each saves Rs 15,000 per month, find their monthly incomes using matrix method. This problem reflects which value? VIEW SOLUTION

  • Question 9
    If x = a sin 2t (1 + cos 2t) and y = b cos 2t (1 – cos 2t), find the values of dydx at t=π4 and t=π3.

    If y = xx, prove that d2ydx2-1ydydx2-yx=0. VIEW SOLUTION

  • Question 10
    Find the values of p and q for which

    fx=1-sin3x3 cos2x, if x<x2p, if x=π/2q1-sin xπ-2x2, if x>π/2

    is continuous at x = π/2. VIEW SOLUTION

  • Question 11
    Show that the equation of normal at any point t on the curve x = 3 cos t – cos3t and y = 3 sin t – sin3t is

    4 (y cos3t – sin3t) = 3 sin 4t. VIEW SOLUTION

  • Question 12
    Find 3 sin θ-2cos θ5-cos2 θ-4 sin θ .


    Evaluate 0πe2x· sinπ4+x dx VIEW SOLUTION

  • Question 15
    Find the particular solution of the differential equation
    (1 – y2) (1 + log x) dx + 2xy dy = 0, given that y = 0 when x = 1. VIEW SOLUTION

  • Question 16
    Find the general solution of the following differential equation :
    1+y2+x-etan-1y dydx=0 VIEW SOLUTION

  • Question 17
    Show that the vectors a, b and c are coplanar if a+b, b+c and c+a are coplanar. VIEW SOLUTION

  • Question 18
    Find the vector and Cartesian equations of the line through the point (1, 2, −4) and perpendicular to the two lines.

    r=8i^-19j^+10k^+λ3i^-16j^+7k^ and r=15i^+29j^+5k^+μ3i^+8j^-5k^. VIEW SOLUTION

  • Question 19
    Three persons A, B and C apply for a job of Manager in a Private Company. Chances of their selection (A, B and C) are in the ratio 1 : 2 :4. The probabilities that A, B and C can introduce changes to improve profits of the company are 0.8, 0.5 and 0.3, respectively. If the change does not take place, find the probability that it is due to the appointment of C.

    A and B throw a pair of dice alternately. A wins the game if he gets a total of 7 and B wins the game if he gets a total of 10. If A starts the game, then find the probability that B wins. VIEW SOLUTION

  • Question 20
    Let f : NN be a function defined as fx=9x2+6x-5. Show that f : NS, where S is the range of f, is invertible. Find the inverse of f and hence find f-143 and f-1163. VIEW SOLUTION

  • Question 21
    Prove that yz-x2zx-y2xy-z2zx-y2xy-z2yz-x2xy-z2yz-x2zx-y2 is divisible by (x + y + z) and hence find the quotient.

    Using elementary transformations, find the inverse of the matrix A=843211122 and use it to solve the following system of linear equations :

    8x + 4y + 3z = 19

    2xyz = 5

    x + 2y + 2z = 7 VIEW SOLUTION

  • Question 22
    Show that the altitude of the right circular cone of maximum volume that can be inscribed in a sphere of radius r is 4r3. Also find maximum volume in terms of volume of the sphere.

    Find the intervals in which f(x) = sin 3x – cos 3x, 0 < x < π, is strictly increasing or strictly decreasing. VIEW SOLUTION

  • Question 23
    Using integration find the area of the region x, y : x2+y2 2ax, y2 ax, x, y  0. VIEW SOLUTION

  • Question 24
    Find the coordinate of the point P where the line through A(3, –4, –5) and B(2, –3, 1) crosses the plane passing through three points L(2, 2, 1), M(3, 0, 1) and N(4, –1, 0).
    Also, find the ratio in which P divides the line segment AB. VIEW SOLUTION

  • Question 25
    An urn contains 3 white and 6 red balls. Four balls are drawn one by one with replacement from the urn. Find the probability distribution of the number of red balls drawn. Also find mean and variance of the distribution. VIEW SOLUTION

  • Question 26
    A manufacturer produces two products A and B. Both the products are processed on two different machines. The available capacity of first machine is 12 hours and that of second machine is 9 hours per day. Each unit of product A requires 3 hours on both machines and each unit of product B requires 2 hours on first machine and 1 hour on second machine. Each unit of product A is sold at Rs 7 profit and  B at a profit of Rs 4. Find the production level per day for maximum profit graphically. VIEW SOLUTION
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