CBSE Board Paper Foreign 2013
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1 CBSE Board Paper Foreign 03 Set - I Time: 3 Hours Max Marks: 00 General Instructions (i) All questions are compulsory (ii) The question paper consists of 9 questions divided into three sections A, B and C Section A comprises 0 questions of one mark each, Section B comprises questions of four marks each and Section C comprises 7 questions of six marks each (iii) All questions in Section A are to be answered in one word, one sentence or as per exact requirement of the question (iv) There is no overall choice However, internal choice has been provided in 4 questions of four marks each and questions of six marks each You have to attempt only one of the alternatives in all such questions (v) Use of calculators is not permitted You may ask for logarithmic tables, if required Question numbers to 0 carry mark each 9 Write the principal value of tan tan 8 3 Write the value of sin sin 5 3 If A is a 3 3 matrix, whose elements are given by aij 3i + j, then write 3 the value of a3 4 If A is a square matrix and A, then write the value of A A0, where A0 is the transpose of matrix A " # If A, then write A 7 6 Write the differential equation formed from the equation y mx + c, where m and c are arbitrary constants 7 If ~a is a unit vector and (~x ~a) (~x + ~a) 4, then write the value of ~x 8 For any three vectors ~a, ~b and ~c, write the value of the following: ~a (~b + ~c) + ~b (~c + ~a) + ~c (~a + ~b)
2 Mathematics Class XII Jai Baba Ki 9 Write the cartesian equation of a plane, bisecting the line segment joining the points A(, 3, 5) and B(4, 5, 7) at right angles 0 If C 0003x3 + 00x + 6x + 50 gives the amount of carbon pollution in air in an area on the entry of x number of vehicles, then find the marginal carbon pollution in the air, when 3 vehicles have entered in the area and write which value does the question indicate Question numbers to carry 4 marks each Prove that the relation R in the set A {5, 6, 7, 8, 9} given by R {(a, b) : a b is divisible by }, is an equivalence relation Find all elements related to the element 6 x+ x + tan, then find the value of x If tan x x+ 4 x If y cot ( cos x) tan ( cos x), then prove that sin y tan 3 Using the properties of determinants, prove the following: a + ab ca ab b + cb ac bc + a + b + c c + 4 Differentiate the following with respect to x: xsin x + (sin x)cos x 5 If y sin (log x), then prove that x d y +x + y 0 6 Show that the function f (x) x x is continuous but not differentiable at x 0 Differentiate tan 7 Evaluate:! + x with respect to tan x, when x 6 0 x sin x + cos x sin x Evaluate: 8 Evaluate: 0 x log ( + x) x tan x sec x + tan x
3 CBSE Board Paper Foreign 03 Jai Baba Ki3 9 The magnitude of the vector product of the vector i + j + k with a unit vector along the sum of vectors i + 4j 5k and λi + j + 3k is equal to Find value of λ x + 0 Evaluate: x 5x + 6 Find the shortest distance between the following lines: x+ y+ z+ 3 x y 5 z 7 ; 7 6 Find the equation of the plane through the points (,, ) and (, 3, 4) and perpendicular to the plane x y + 4z 0 In a group of 50 students in a camp, 30 are well trained in first aid techniques while the remaining are well trained in hospitality but not in first aid Two scouts are selected at random from the group Find the probability distribution of number of selected scouts who are well trained in first aid Find the mean of the distribution also Write one more value which is expected from a well trained scout Question numbers 3 to 9 carry 6 marks each 3 0 students were selected from a school on the basis of values for giving awards and were divided into three groups The first group comprises hard workers, the second has honest and law abiding students and the third group contains vigilant and obedient students Double the number of students of the first group added to the number in the second group gives 3, while the combined strength of first and second group is four times that of the third group Apart from the values, hard work, honesty and respect for law, vigilance and obedience, suggest one more value, which in your opinion, the school should consider for awards 4 Prove that the volume of the largest cone, that can be inscribed in a sphere of radius 8 of the volume of the sphere R is 7 Show that the normal at any point θ to the curve x a cos θ + aθ sin θ, y a sin θ aθ cos θ is at a constant distance from the origin 5 Find the area enclosed by the parabola 4y 3x and the line y 3x + y 6 Prove that the differential equation x xy + cos, x 6 0 is not x homogeneous Find the particular solution of this differential equation, given that when x, y
4 4Jai Baba Ki Mathematics Class XII 7 Find the image of the point having position vector i + 3j + 4k in the plane ~r (i j + k ) Find the equation of a plane which is at a distance of 3 3 units from origin and the normal to which is equally inclined to the coordinate axes 8 An aeroplane can carry a maximum of 00 passengers A profit of 500 is made on each executive class ticket out of which 0% will go to the welfare fund of the employees Similarly a profit of 400 is made on each economy ticket out of which 5% will go for improvement of facilities provided to economy class passengers In both cases, the remaining profit goes to the airline s fund The airline reserves at least 0 seats for executive class However, at least 4 times as many passengers prefer to travel by economy class than by the executive class Determine how many tickets of each type must be sold in order to maximise the net profit of the airline? Make the above as an LPP and solve graphically Do you think, more passengers would prefer to travel by such an airline than by others? 9 Often it is taken that a truthful person commands more respect in the society A man is known to speak the truth 4 out of 5 times He throws a die and reports that it is actually a six Find the probability that it is actually a six Do you also agree that the value of truthfulness leads to more respect in the society Set - II (Uncommon Questions wrt Set - I) 9 If p~ is a unit vector and (~x p~) (~x + p~) 48, then write the value of ~x 7 0 Write the principal value of tan tan 6 9 Differentiate the following with respect to x: (sin x)x + (cos x)sin x 0 Find a vector of magnitude 6, perpendicular to each of the vectors ~a + ~b and ~a ~b, where ~a i + j + k and ~b i + j + 3k Prove that the relation R in the set A {,, 3,, } given by R {(a, b) : a b is divisible by 3}, is an equivalence relation Find all elements related to the element x Evaluate: x x 8 Find the area of the region bounded by the parabola y x and the line x y 4 9 Show that differential equation (x y) x + y is homogeneous and solve it
5 CBSE Board Paper Foreign 03 Jai Baba Ki5 Set - III (Uncommon Questions wrt Sets - I and II) 9 Write cot, x > in simplest form x 0 If ~a is a unit vector and (~x 3~a) (~x + 3~a) 9, then write the value of ~x x x Using properties of determinants, prove the following: 9 Evaluate: x + a b ab b ab a + b a b 3 + a + b a a b Find a unit vector perpendicular to each of the vectors (~a + ~b) and (~a + ~b), where ~a 3i + j + k and ~b i + j k Differentiate the following wrt x: + sin x + sin x tan, 0<x< + sin x sin x 8 Find the area of the region bounded by the two parabolas y 4ax and x 4ay, when a > 0 9 Show that the differential equation yex/y + y xex/y 0 is homogeneous Find the particular solution of this differential equation, given that when y, x 0 ooo
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