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cbse sample paper for class 12 maths with solution

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www.ncerthelp.com SAMPLE QUESTION PAPER MATHEMATICS CLASS XII BLUE PRINT Unit I. VSA (1) Relations and Functions SA (4) LA (6) Total 1 (1) 4 (1) 5 (2) 10 (4) Inverse Trigonometric Functions II. 1 (1) *4 (1) 5 (2) Matrices 2 (2) VB 6 (1) 8 (3) 13 (5) Determinants 4 (1) 5 (2) Continuity and Differentiability 8 (2) 18 (4) Application of Derivatives *4 (1) 6 (1) 2 (2) *4 (1) 6 (1) 18 (5) Application of Integrals 6 (1) Differential equations 8 (2) 8 (2) Vectors 2 (2) *4 (1) 6 (3) 3 dim geometry III. 1 (1) 1 (1) 4 (1) *6 (1) 11 (3) Integrals IV. 44 (11) 17 (6) V. Linear Programming VB 6 (1) 6 (1) VI. Probability VB 4 (1) *6 (1) 10 (2) Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com SECTION A Question number 1 to 10 carry 1 mark each. 1. Write the smallest equivalence relation R on Set A = {1, 2, 3}. 2. If | | 3. If and are two unit vectors inclined to x axis at angles 300 and 1200 , then find the value of | | respectively, then write the value of | 4. | | | | | Find the sine of the angle between the line and the plane 2x 2y + z 5 = 0. ( ) 5. Evaluate 6. If A = ( 7. For what value of k, the matrix ( 8. If | 9. If ( 10. Evaluate: ), then what is A. (adj. A)? | ) is skew symmetric? , where , are acute angles, then write the value of + . ) write the value of k. ( ) SECTION B Questions numbers 11 to 22 carry 4 marks each. 11. Let S be the set of all rational numbers except 1 and * be defined on S by a * b = a + b ab, a, b S. Prove that: a) * is a binary on S. b) * is commutative as well as associative. Also find the identity element of *. Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com 12. If a + b + c o and | | , then using properties of determinants, prove that a = b = c. 13. Evaluate: ( ) dx OR Evaluate: ( 14. )( ) Find a unit vector perpendicular to the plane of triangle ABC where the vertices are A (3, 1, 2) B (1, 1, 3) and C (4, 3, 1). OR Find the value of , if the points with position vectors and 15. are coplanar. ( Show that the lines ) ( ) and ( ) ( ) intersect. Also find their point of intersection. 16. Prove that OR Find the greatest and least values of ( 17. Show that the differential equation ) ( ) is homogeneous, and solve it. 18. Find the particular solution of the differential equation cos x dy = sin x (cos x 2y) dx, given that y = 0 when 19. . Out of a group of 8 highly qualified doctors in a hospital, 6 are very kind and cooperative with their patients and so are very popular, while the other two Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com remain reserved. For a health camp, three doctors are selected at random. Find the probability distribution of the number of very popular doctors. What values are expected from the doctors? 20. Show that the function g(x) = |x 2|, x R, is continuous but not differentiable at x = 2. ( ) with respect to x. 21. Differentiate 22. Show that the curves xy = a2 and x2 + y2 = 2a2 touch each other. OR Separate the interval [ ] into sub intervals in which f (x) = is increasing or decreasing. SECTION D Question numbers 23 to 29 carry 6 marks each. 23. Find the equation of the plane through the points A (1, 1, 0), B (1, 2, 1) and C ( 2, 2, 1) and hence find the distance between the plane and the line . OR A plane meets the x, y and z axes at A, B and C respectively, such that the centroid of the triangle ABC is (1, 2, 3). Find the Vector and Cartesian equation of the plane. 24. A company manufactures two types of sweaters, type A and type B. It costs Rs. 360 to make one unit of type A and Rs. 120 to make a unit of type B. The company can make atmost 300 sweaters and can spend atmost Rs. 72000 a day. The number of sweaters of type A cannot exceed the number of type B by more than 100. The company makes a profit of Rs. 200 on each unit of type A but considering the Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com difficulties of a common man the company charges a nominal profit of Rs. 20 on a unit of type B. Using LPP, solve the problem for maximum profit. ( ) 25. Evaluate: 26. Using integration find the area of the region {( 27. A shopkeeper sells three types of flower seeds A1, A2 and A3. They are sold as a ) } mixture where the proportions are 4:4:2 respectively. The germination rates of three types of seeds are 45%, 60% and 35%. Calculate the probability. a) of a randomly chosen seed to germinate. b) that it is of the type A2, given that a randomly chosen seed does not germinate. OR Bag I contains 3 red and 4 black balls and Bag II contains 4 red and 5 black balls. One ball is transferred from Bag I to Bag II and then two balls are drawn at random (without replacement) from Bag II. The balls so drawn are found to be both red in colour. Find the probability that the transferred ball is red. 28. Two schools A and B want to award their selected teachers on the values of honesty, hard work and regularity. The school A wants to award Rs. x each, Rs. y each and Rs. z each for the three respective values to 3, 2 and 1 teachers with a total award money of Rs. 1.28 lakhs. School B wants to spend Rs. 1.54 lakhs to award its 4, 1 and 3 teachers on the respective values (by giving the same award money for the three values as before). If the total amount of award for one prize on each value is Rs. 57000, using matrices, find the award money for each value. 29. A given rectangular area is to be fenced off in a field whose length lies along a straight river. If no fencing is needed along the river, show that the least length of fencing will be required when length of the field is twice its breadth. Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com MARKING SCHEME SECTION A 1. R = {( 2. 2a2 1 3. 1 4. )( )( )} 1 1 5. 6. ( 7. k= 1 ) 1 1 1 8. 9. k = 2 1 10. cot x ex + C 1 SECTION B 11. a) let ( )( Since ) 1 b) is commutative also, ( ) ( = 1 ) Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com ( ) ( = ) ( ) ) ( = is associative 1 Let e be the identity, Then a * e = a a + e ae = a e (1 a) = 0 1 Since 1 a 0 e = 0. 12. | | ( )| ( | )| = (a + b + c) ( b2 c2 + 2bc a2 + ac + ab bc) = 0 1 | 1 = (a + b + c) (a2 + b2 + c2 ab bc ca) = 0 = (a + b + c) [(a b)2 + (b c)2 + (c a)2] = 0 1 Since a + b + c = 0 a b = 0, b c = 0, c a = 0 or a = b = c. 13. ( ( 1 ) ( ( ) ) ( ) dx ) where sin x = t 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com ( ) = ( ) ( = ) = [ [ ] [ |( ) ( | ] 1 ) )| |( ] 1 OR ( ( )( )( ) ) | 14. 2 1 | ( ) 1 A vector perpendicular to the plane of ABC = = | | 1+1 1 or | | Unit vector to plane of ABC = ( ) OR Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com Let the points be A (3, 2, 1), B (2, 3, 4), C ( 1, 1, 2) and D (4, 5, ) ) 1 A, B, C, D are coplanar if [ ] = 0 [ ] ( | | 1(15+9) 7 ( 3 12) + ( +1) ( 3+20) = 0 1 = 15. Let, any point on the line and any point on line ( ( ) ) ( ( ) be P ( ) be Q ( If the lines intersect, P and Q must coincide for some and . ) ) 1+3 = 4+2 ..... (i) 1 = 0 ..... (ii) 1 = 1 + 3 ..... (iii) Solving (ii) and (iii) we get = 1 and = 0 1 Putting in (i) we get 4 = 4, hence lines intersect. P or Q (4, 0, 1) is the point of intersection. 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com 16. LHS = = = = 1 1 = cot 1 3=RHS OR ( ) ( ) =( =( ) ) = [( ) x dy y dx = = x ,y + ) ) ] ] 1 [ ] 1 and greatest value = 2 [( 17. ( = [( least value = ( = ) ) ] 1 dx + = = + ( ) =f( ) ( ) = [ ( ( ) ] 1 ) Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com differential equation is homogeneous. let = v or y = vx v+x =v+x or = v+ log|v + y+ 18. = 1 v+ | = log cx = cx 1 = cx2 1 Given differential equation can be written as cot x + 2y = cos x or + 2 tan xy = sin x Integrating factor = = = sec2 x. 1 x dx C = -2 the solution is y. sec2x = = y. sec2x = sec x + c 1 y = cosx + c cos2x. When x = , y = 0 0= + C Hence the solution is y = cosx 2cos2 x. 19. let x be the random variable representing the number of very popular doctors. x: 1 P(x) 2 6C1 . 2C2 6C2. 2C1 8C3 = 3 6C3 8C3 = 8C3 = 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com It is expected that a doctor must be Qualified Very kind and cooperative with the patients 20. 2 g(x) = |x-2| = { LHL = lim (2-x) = 0 x 2RHL = lim (x-2) = 0 and g (2) = 0 x 2+ 1 g(x) is continuous at x = 2 .. LHD = lim h 0 RHD = lim h 0 LHD 21. RHD ( ) ( ( ) ) ( ) ( = lim h 0 = lim h 0 ( ) ) = -1 1 =1 g(x) is not differentiable at x = 2 Let y = log (xsinx + cot2 x) = (xsinx + cot2x) .. Let u = and v = cot2x. log u = sinx. log x , = or 1 = 2 cot x ( cosec2x) + logx. cosx = xsinx [ = ] .. [ ( ) 1 ] 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com 22. Solving xy = a2 and x2+y2 = 2a2 to get x = a for x = a, y = a and x = -a, y = -a i.e the two curves intersect at P (a, a) and Q (-a, -a) xy = a2 +y=0 x x2+y2 = 2a2 2x+2y = 1 1 = =0 = -1 at P and Q 1 = -1 at P and Q Two curves touch each other at P as well as at Q. 1 OR f(x) = sin4x + cos4x f (x) = 4 sin3x cosx -4 cos3x sinx = -4 sinx cosx (cos2x sin2x) = 2 sin2x cos2x = - sin 4x f'(x) = 0 x = 0, sin4x = 0 4x = 0, 1 2 , 3 , , 1 ) ( Sub Intervals are ( f (x) < 0 in (0, And f (x) > 0 in ( ) ) f(x) is decreasing in (0, , ) f(x) in increasing in ( ) 1 , ) 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com SECTION D 23. A vector = | to the plane is parallel to | = 1 1 Equation of plane is . (2 + 3 3 ) = 5 ( 1 ) Since, (2 + 3 3 ). (3 + ) = 0, so the given line is parallel to the plane. Distance between the point (on the line) (6, 3, -2) and the plane . (2 + 3 3 ) 5 = 0 is d= | | = = 1 Let the coordinates of points A, B and C be (a, 0, 0), (0, b, 0) and (0, 0, c) respectively. Equation of plane is = 1, a = 3, + = 1 and = -2 b = -6 Equation of plane is or + and and + 1 + =1 6x 3y + 2z 18 = 0 =3 1 c=9 1 1 which in vector form is (6 3 + 2 ) = 18 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com 24. let the company manufactures sweaters of type A = x, and that of type B = y. daily LPP is Maximise P = 200x + 20y s.t. x+y 300 360 x + 120y x y x 1 72000 100 0y 1 0 Correct Graph 1 Getting vertices of the feasible region as A (100, 0), B (175, 75), C (150, 150) and D (0, 300) Maximum profit at B So Maximum Profit = 200 (175) + 20 (75) = 35000 + 1500 1 = Rs. 36500 25. let I = ( = = [( ) . x dx ) ] 1 x = tan = - d - = dx = sec2 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com = [ = ] [ ] + = 1 [ ] 1 log 2 1 Correct figure: 1 Correct Figure 26. 1 Solving x2 + y2 = 1 and x + = 1 to get x = and x = 1 as points of intersection Required area = = [ ( [ ] ( = = ( ) [ ) sq. u. ) ] ] 1 1 1 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com 27. let E1 : randomly selected seed is A1 type P(E1) = E2 : randomly selected seed is A2 type P(E2) = 1 E3 : randomly selected seed is A3 type P (E3) = (i) let A : selected seed germinates P (A/E1) = P (A/E2) = P (A/E3) = 1 P(A) = P(E1) P(A/E1) + P(E2) P(A/E2) + P (E3). P(A/E3) = = (ii) or 0.49 1 let A : selected seed does not germinate P(A/E1) = P(E2/A) = , P(A/E2) = ( ( ) ( | ) ( P(A/E3) = ) ( | ) ) ( | ) ( ) ( | ) = 1 OR Let E1 : transferred ball is red. E2 : transferred ball is black. A : Getting both red from 2nd bag (after transfer) P(E1) = P(E2) = 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com 5 P(A/E1) = P(A/E2) = P(E1/A) = C2 = C2 4 C2 = C2 1 or 10 1 ) ( | ) ) ( | ) ( ) ( | ( ( = 28. or 10 ) = 1+1 The three equations are 3x+2y+z = 1.28 4x + y + 3z = 1.54 x + y + z = 0.57 ( ) ( )= ( ) 1 i.e AX = B |A| = -5 and X = A-1B 1 A-1 = ( ) 1 ( )= ( )( )=( x = 25000, y = 21000, z = 11000 29. ) 1 let length be x m and breadth be y m. length of fence L = x+2y Let given area = a L=x+ xy = a or y = 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... www.ncerthelp.com =1 =o = 1 x2 = 2a x= >o for minimum length L = x= x = 2y 1 and breadth y = + = = = x 1 1 Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More...

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