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Board Paper of Class 12-Science 2015 Maths All India(SET 2) - 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
    Write the value of  a . b  × a. VIEW SOLUTION
  • Question 2
    If a= i^ + 2 j^ - k^, b = 2 i^ + j^ + k^ and c = 5 i^ - 4 j^ + 3 k^, then find the value of a + b. c. VIEW SOLUTION
  • Question 3
    Write the direction ratios of the following line :

    x = -3, y-43 = 2 -z1 VIEW SOLUTION
  • Question 5
    Find the differential equation representing the curve y = cx + c2. VIEW SOLUTION
  • Question 6
    Write the integrating factor of the following differential equation:

    (1+y2) dx-(tan-1 y-x) dy=0 VIEW SOLUTION
  • Question 7
    Using the properties of determinants, prove the following:

    1xx+12xx(x-1)x(x+1)3x(1-x)   x(x-1) (x-2) x(x+1) (x-1)=6x2 1-x2 VIEW SOLUTION
  • Question 8
    If x=α sin 2t (1 + cos 2t) and y=β cos 2t (1-cos 2t), show that dydx=βαtan t. VIEW SOLUTION
  • Question 10
    Find the derivative of the following function f(x) w.r.t. x, at x = 1 :
    cos-1 sin 1+x2+xx VIEW SOLUTION
  • Question 11
    Evaluate :
    0π22sin x2sin x+2cos xdx
     
    OR

    Evaluate :03/2 x·cos πxdx VIEW SOLUTION
  • Question 12
    To raise money for an orphanage, students of three schools A, B and C organised an exhibition in their locality, where they sold paper bags, scrap-books and pastel sheets made by them using recycled paper, at the rate of Rs 20, Rs 15 and Rs 5 per unit respectively. School A sold 25 paper bags, 12 scrap-books and 34 pastel sheets. School B sold 22 paper bags, 15 scrap-books and 28 pastel sheets while School C sold 26 paper bags, 18 scrap-books and 36 pastel sheets. Using matrices, find the total amount raised by each school.

    By such exhibition, which values are generated in the students? VIEW SOLUTION
  • Question 13
    Prove that :

    2 tan-1a-ba+btanx2=cos-1a cos x+ba+b cos x

    OR

    Solve the following for x :

    tan-1x-2x-3+tan-1x+2x+3=π4, x<1. VIEW SOLUTION
  • Question 14
    If A = 2   0  12   1  31-1  0, find A2 − 5 A + 16 I. VIEW SOLUTION
  • Question 15
    Show that four points A, B, C and D whose position vectors are 4i^+5j^+k^, -j^ -k^,  3i^+9j^+4k^ and 4-i^+j^+k^ respectively are coplanar. VIEW SOLUTION
  • Question 16
    Show that the following two lines are coplanar:

    x-a+dα-δ= y-aα=z-a-dα+δ and x-b+cβ-γ=y-bβ=z-b-cβ+γ
     
    OR

    Find the acute angle between the plane 5x − 4y + 7z − 13 = 0 and the y-axis. VIEW SOLUTION
  • Question 17
    A and B throw a die alternatively till one of them gets a number greater than four and wins the game. If A starts the game, what is the probability of B winning?

    OR
     
    A die is thrown three times. Events A and B are defined as below:
    A : 5 on the first and 6 on the second throw.
    B: 3 or 4 on the third throw.

    Find the probability of B, given that A has already occurred.
    VIEW SOLUTION
  • Question 20
    Using integration, find the area of the region bounded by the lines y = 2 + x, y = 2 – x and x = 2. VIEW SOLUTION
  • Question 21
    Find the the differential equation for all the straight lines, which are at a unit distance from the origin.

    OR

    Show that the differential  equation 2xydydx=x2+3y2 is homogeneous and solve it. VIEW SOLUTION
  • Question 22
    Find the direction ratios of the normal to the plane, which passes through the points (1, 0, 0) and (0, 1, 0) and makes angle π4 with the plane x + y = 3. Also find the equation of the plane. VIEW SOLUTION
  • Question 23
    If the function f : R → R be defined by f(x) = 2x − 3 and g : R → R by g(x) = x3 + 5, then find the value of (fog)−1 (x).
     
    OR

    Let A = Q ✕ Q, where Q is the set of all rational numbers, and * be a binary operation defined on A by
    (a, b) * (c, d) = (ac, b + ad), for all (a, b) (c, d) ∈ A.
    Find
    (i) the identity element in A
    (ii) the invertible element of A. VIEW SOLUTION
  • Question 24
    If the function f(x)=2x3-9mx2+12m2x+1, where m>0 attains its maximum and minimum at p and q respectively such that p2=q, then find the value of m. VIEW SOLUTION
  • Question 25
    The postmaster of a local post office wishes to hire extra helpers during the Deepawali season, because of a large increase in the volume of mail handling and delivery. Because of the limited office space and the budgetary conditions, the number of temporary helpers must not exceed 10. According to past experience, a man can handle 300 letters and 80 packages per day, on the average, and a woman can handle 400 letters and 50 packets per day. The postmaster believes that the daily volume of extra mail and packages will be no less than 3400 and 680 respectively. A man receives Rs 225 a day and a woman receives Rs 200 a day. How many men and women helpers should be hired to keep the pay-roll at a minimum ? Formulate an LPP and solve it graphically. VIEW SOLUTION
  • Question 26
    40% students of a college reside in hostel and the remaining reside outside. At the end of the year, 50% of the hostelers got A grade while from outside students, only 30% got A grade in the examination. At the end of the year, a student of the college was chosen at random and was found to have gotten A grade. What is the probability that the selected student was a hosteler ? VIEW SOLUTION
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