BLUE PRINT: CLASS XII MATHS
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1 BLUE PRINT: CLASS XII MATHS CHAPTER S NAME MARK 4 MARKS 6 MARKS TOTAL. RELATIONS AND FUNCTIONS 5. INVERSE TRIGONOMETRIC 5 FUNCTIONS 3. MATRICES 7 4. DETERMINANTS DIFFERENTIATION 6 APPLICATION OF 0 DERIVATIVES 7. INTEGRALS 8. APPLICATION OF 6 INTEGRALAS 9. DIFFERENTIALS 8 EQUATION 0. VECTS 3 7 THREE DIMENSAIONAL 0 GEOMETRY. LINEAR PROGRAMMING 6 3. PROBABILITY 0 TOTAL 0 ( 0) ( 48 ) 7 ( 4 ) 00 Model question paper
2 Time: 3hrs Mathematics Class: Max.marks:00 General Instructions:. All questions are compulsory. The question paper consists of 9 questions divided into three sections A,B and C. Section A comprises of 0 questions of mark each, Section B comprises of questions of 4 marks each and Section C comprises of 7 questions of 6 marks each. 3. Use of calculators is not permitted. SECTION A. If A is square matrix of order 3 such that = 64, find. If A, find ; 0<. when A + = I. 3. If x = 6.Find x 8 x Let * be a binary operation on R given by a * b =. Write the value of 3 * Evaluate : Sin {π/3 - }. dx 6. Evaluate x x. 7. If + bx ) dx = +. find the values of a and b. 8. If = i + j, = j + k, find the unit vector in the direction of If =, = and angle between and is 60. Find 0. What is the cosine of the angle which the vector i + j + k makes with y-axis. SECTION B. Prove that sin sin cos. Consider
3 f : R [ 5, ) given by f x 9x 6x 5. Showthat. f is invertible. Find inverse of f? 3. Show that a b abc a b c c d y 4. If x=a sin pt and y=b cos pt, find the value of 0 at t. dx 5. If y = sin tan x Pr dy x ove that x dx x 6 Find the intervals in which the function f(x) = sinx cosx ; 0 x π is (i) increasing (ii) decreasing x 4 7. Evaluate dx. 4 x x 6 Evaluate 0 x sin x dx. cos x 8. Form the differential equation representing the family of ellipse having foci on x-axis and centre at the origin. Form the differential equation of the family of circles having radii Find the equation of the plane determined by the points A(3,-,), B(5,,4) and C(-,-,6) Also find the distance of the point P( 6,5,9) from the plane dy 0. Solve the differential equation ysec x tan x.sec x ; y(0). dx. If a and b are unit vectors and θ is the angle between them, then prove that cos θ/ = ½ a + b. Find the probability distribution of the number of heads in a single throw of three coins. Three balls are drawn one by one without replacement from a bag containing 5 white and 4 green balls. Find the probability distribution of number of green balls drawn. SECTION C 3. Find the matrix A satisfying the matrix equation
4 3 0 A Evaluate 5. Show that the semi vertical angle of right circular cone of given surface area and maximum volume is sin Using method of integration find the area of the region bounded by the lines x + y =4, 3x - y = 6 and x - 3y + 5 = Find the distance of the point (3,4,5) from the plane x y z measured parallel to the line x= y =z. Find the coordinates of the foot of the perpendicular and the perpendicular distance of the point (,3,4) from the plane x y + z + 3 = 0. And also find the image of the point in the plane. 8. A dealer in rural area wishes to purchase a number of sewing machines. He has only rupees to invest and has space for at most 0 items. Electronic sewing machines cost him rupees 360 and manually operated sewing machine rs.40. He can sell an electronic sewing machine at a profit of rupees and a manually operated sewing machine at a profit of Rs.8. Assuming that he can sell all the items he can buy, how should he invest his money in order to maximize his profit. Make it as a Linear Programming Problem and solve it graphically. Justify the values promoted for the selection of the manually operated machines. 9. A student is known to speak truth 3 out of 4 times. He throws a die and reports that it is a six. Find the probability that it is actually a six. To get the probability as, Which value to be promoted among students.. n MARKING SCHEME CLASS XII AdjA A A 8 (). /3
5 3. x = +6 or / log x +c. 7. a = 4 and b = 3 8. i+ j + k / ½. Let, 5 7 s i n, s i n, 3 5 () t h e n c o s 4, c o s 3 5 ( ) 5 3 c o s 3 5 ( ) s i n s i n c o s let x,x R+ s.t f (x ) = f (x ) prove that x = x () f is -
6 9 6 5 x x y (3x ) 6 y 3x y 6 ( y 6 ) x f ( y) 3 Therefore for every y ), ( -) / 3 R+ s.t f ( -) / 3 ) = y. f is onto. ( ) since f is - and onto, f is invertible ( ) Therfore (x): from ) to R+ defined as (x) = ( -)/3 () 3. a b c a b c a b c a b c C C C 3 b c abc () a b c b c b c 0 abc( ) () a b c 0 a b c ( ) () a b c 4.
7 dx dy ap cos pt bp sin pt dt dt dy b tan pt dx a () d y b 3 sec pt dx d y dx a b a at t0 5..Let x = cos t Y=sin =sin ( ) Y=sin t= () = ( ) 6. f (x)=cos(x) + sin(x) f (x)=0 tan(x) = - () x=3π/4 and 7π/4 Intervals are [0,3π/4),(3π/4,7π/4), (7π/4,π] () [0,3π/4)- f is positive, so f(x) is increasing (3π/4,7π/4)- f is negative, so f(x) is decreasing (7π/4,π]-f is positive, so f(x) is increasing () 7. Consider 4 x 4 x dx x x 6 6 x x () dt 4 =, wheret x t 3 x () = tan t c 3 3 () x 4 = tan c 3 3x () dx 4
8 consider 0 x x x x dx dx cos cos x sin cos sin () x 0 x By solving further we get given = = x x sec tan () x dx dx 0 0 tan () 4 8. The equation of the ellipse is + = () x/a + y/b dy/dx = 0 (y/x)dy/dx=-b /a () Differentiating again and getting the differential equation as (xy)d y/dx + x(dy/dx) ydy/dx = 0 ()
9 9. Equation of the plane x 3 y z i. e., 3x 4y 3z 9 0 () Now the perp. Distance from (6,5,9)to this plane is units () 0. Which is in linear differential equation For finding I.F.= x dx tan x e e () Solution y.i.f. = () tan x tan x =tan x. e e c () When x =0, y = c and writing the completed solution (). Consider a b cos () =(+cos ) () =4 cos cos () a b. Let X be the number of heads,x=0,,,3 P(having head)=p=/ q=/, n= () Now P(X=0)= 3 p q q C 0 8 Probability distribution X 0 3 P(X) /8 3/8 3/8 / ()
10 3. 4. I= SECTION C 3 Let B and C B 0 and c 0 3 adjb (3) 3 adjc B and C (3) A B C I= () I=π () I=π I=π () For getting the answer as (3)
11 5. Let r, h, l,s and V be the radius, height, slant height. surface area and the volume of the cone. h l r S= rl r S r l r () 4 and V r h V r h () dv 0 dr ( 3 rs 8 S r ) 0 9 For max or min r l () d V now ( at S 4 r ) o dr V is max imum. r sin Now l 3 sin ( ). 3 V is max imum () () 6. Let AB x + y =4 BC 3x-y=6 and AC x-3y+5=0 Solving and B(,0), C(4,3) and A(,) ( ) For the correct figure () Area of triangle = dx - dx ( )
12 For integrating and getting area=7/ sq.units () 7. Line is x/=y/=z/ () Line PQ through P(3,4,5)and II to the given line is () (x-3)/=(y-4)/ =(z-5)/= General point on the line is Q( 3, 4, 5) If this point lies on the plane x+y+z=, Q(, 0,) PQ (3) (4 0) (5 ) () ()
13 8. Suppose number of electronic operated machine = x and number of manually operated sewing machines = y x+y < (i) and, 360 x + 40y < 5760 or 3x+y < (ii) x>0, y>0 To maximise Z=x + 8y Corners of feasible region are A (0,0), P(8,), B(6,0) ZA = 8x0 = 360, ZP = x8+8x = 39, ZB = 35 ½
14 Z is maximum at x=8 and y= The dealer should invest in 8 electric and manually operated machines (½) Keeping the save environment factor in mind the manually operated machine should be promoted so that energy could be saved. () 9. Let E be the event that the student reports that 6 occurs in the throwing of die and let S be the event that 6 occurs and S be the event that 6 does not occur. P(S )=/6, P(S )=5/6, () P(E/S )=3/4, P(E/S )=/4 () P(S /E)= =3/8 () To get the probability as one, the student should always speak truth. The value to be promoted among students is truth value. ()
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