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IIT JAM 2011 : Mathematics

43 pages, 40 questions, 8 questions with responses, 10 total responses,

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A A 2011 MA 2011 MA Test Paper Code: MA Time: 3 Hours Maximum Marks: 300 INSTRUCTIONS 1. This question-cum-answer booklet has 40 pages and has 29 questions. Please ensure that the copy of the question-cum-answer booklet you have received contains all the questions. 2. Write your Registration Number, Name and the name of the Test Centre in the appropriate space provided on the right side. 3. Write the answers to the objective questions against each Question No. in the Answer Table for Objective Questions, provided on Page No. 7. Do not write anything else on this page. 4. Each objective question has 4 choices for its answer: (A), (B), (C) and (D). Only ONE of them is the correct answer. There will be negative marking for wrong answers to objective questions. The following marking scheme for objective questions shall be used: (a) For each correct answer, you will be awarded 6 (Six) marks. (b) For each wrong answer, you will be awarded -2 (Negative two) marks. (c) Multiple answers to a question will be treated as a wrong answer. (d) For each un-attempted question, you will be awarded 0 (Zero) marks. (e) Negative marks for objective part will be carried over to total marks. 5. Answer the subjective question only in the space provided after each question. 6. Do not write more than one answer for the same question. In case you attempt a subjective question more than once, please cancel the answer(s) you consider wrong. Otherwise, the answer appearing last only will be evaluated. 7. All answers must be written in blue/black/blueblack ink only. Sketch pen, pencil or ink of any other colour should not be used. 8. All rough work should be done in the space provided and scored out finally. 9. No supplementary sheets will be provided to the candidates. 10. Clip board, log tables, slide rule, calculator, cellular phone and electronic gadgets in any form are NOT allowed. 11. The question-cum-answer booklet must be returned in its entirety to the Invigilator before leaving the examination hall. Do not remove any page from this booklet. 12. Refer to special instructions/useful data on the reverse. MA- i / 40 READ INSTRUCTIONS ON THE LEFT SIDE OF THIS PAGE CAREFULLY REGISTRATION NUMBER Name: Test Centre: Do not write your Registration Number or Name anywhere else in this question-cum-answer booklet. I have read all the instructions and shall abide by them. ... Signature of the Candidate I have verified the information filled by the Candidate above. ... Signature of the Invigilator A Special Instructions/ Useful Data : The set of all real numbers : The set of all natural numbers, that is, the set of all positive integers 1, 2, . . : The set of all integers MA- ii / 40 A Q.1 IMPORTANT NOTE FOR CANDIDATES Questions 1-15 (objective questions) carry six marks each and questions 16-29 (subjective questions) carry fifteen marks each. Write the answers to the objective questions in the Answer Table for Objective Questions provided on page 7 only. Let an n n k 1 n k , for n . Then the sequence an is 2 (A) Convergent (C) Diverges to Q.2 (B) Bounded but not convergent (D) Neither bounded nor diverges to The number of real roots of the equation x3 x 1 0 is (A) 0 (B) 1 Q.3 n The value of lim 1 n k 1 (D) 3 (C) 2 2 (D) is (B) 2 2 1 (A) 2( 2 1) Q.4 n 2 kn (C) 2 1 ( 2 1) 2 Let V be the region bounded by the planes x 0, x 2, y 0, z 0 and y z 1 . Then the value of the integral y dx dy dz is V (A) Q.5 1 2 (B) (C) 1 4 3 The solution y( x) of the differential equation d2y dx y (0) 4, (A) 4 e2 x 2 4 (D) 1 3 dy 4 y 0 satisfying the conditions dx dy (0) 8 is dx (B) (16 x 4) e 2 x (C) 4 e 2 x 16 x MA- 1 / 40 (D) 4e 2 x 16 x e 2 x A Q.6 If y a is an integrating factor of the differential equation 2 x y dx (3 x 2 y 2 ) dy 0 , then the value of a is (A) 4 Q.7 (C) 1 (B) 4 (D) 1 and C be the positively oriented closed curve given by z Let F a y i j xk x 2 y 2 1, z 0. If F dr , then the value of a is C (A) 1 Q.8 (C) 1 2 (D) 1 , where a is a constant. If Consider the vector field F (a x y a) i j ( x y) k F curl F 0, then the value of a is (A) 1 Q.9 (B) 0 (C) 1 (B) 0 (D) 3 2 Let G denote the group of all 2 2 invertible matrices with entries from . Let H1 A G : det ( A) 1 and H 2 A G : A is upper triangular . Consider the following statements: P : H1 is a normal subgroup of G Q : H 2 is a normal subgroup of G . Then (A) Both P and Q are true (C) P is false and Q is true Q.10 (B) P is true and Q is false (D) Both P and Q are false For n , let n nk : k . Then the number of units of /11 and /12 , respectively, are (A) 11, 12 (B) 10, 11 (C) 10, 4 MA- 2 / 40 (D) 10, 8 A Q.11 Let A be a 3 3 matrix with trace ( A) = 3 and det ( A) = 2. If 1 is an eigenvalue of A , then the eigenvalues of the matrix A2 2 I are (A) 1, 2(i 1), 2(i 1) (C) 1, 2(i 1), 2(i 1) Q.12 (B) 1, 2(i 1), 2(i 1) (D) 1, 2(i 1), 2(i 1) Let T : n n be a linear transformation, where n 2. For k n, let E v1, v2 ,..., vk n and F Tv1 , Tv2 ,..., Tvk . Then (A) (B) (C) (D) Q.13 If If If If E is linearly independent, then F is linearly independent F is linearly independent, then E is linearly independent E is linearly independent, then F is linearly dependent F is linearly independent, then E is linearly dependent For n m, let T1 : n m and T2 : m n be linear transformations such that T1T2 is bijective. Then (A) rank ( T1 ) = n and rank ( T2 ) = m (C) rank ( T1 ) = n and rank ( T2 ) = n Q.14 (B) rank ( T1 ) = m and rank ( T2 ) = n (D) rank ( T1 ) = m and rank ( T2 ) = m The set of all x at which the power series n 1 (A) 1, 1 Q.15 (B) 1,1 n (2n 1) 2 ( x 2)3n converges is (C) 1, 3 (D) 1, 3 Consider the following subsets of : n : n , E n 1 Then 1 : 0 x 1 . F 1 x (A) Both E and F are closed (C) E is NOT closed and F is closed (B) E is closed and F is NOT closed (D) Neither E nor F is closed MA- 3 / 40 A Space for rough work MA- 4 / 40 A Space for rough work MA- 5 / 40 A Space for rough work MA- 6 / 40 A Answer Table for Objective Questions Write the Code of your chosen answer only in the Answer column against each Question No. Do not write anything else on this page. Question Number Answer Do not write in this column 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 FOR EVALUATION ONLY Number of Correct Answers Marks (+) Number of Incorrect Answers Marks ( ) Total Marks in Questions 1-15 MA- 7 / 40 ( ) A Q.16 (a) Let an be a sequence of non-negative real numbers such that an converges, n 1 and let kn be a strictly increasing sequence of positive integers. Show that a kn also converges. n 1 (9) (b) Suppose f : 0,1 is differentiable and f ( x) 1 at every x 0,1 . If f (0) 0 and f (1) 1 , show that f ( x) x for all x 0,1 . MA- 8 / 40 (6) A MA- 9 / 40 A Q.17 (a) Suppose f is a real valued function defined on an open interval I and differentiable at every x I . If [a, b] I and f (a) 0 f (b) , then show that there exists c (a, b) such that f (c) min f ( x). a x b (9) (b) Let f : (a, b) be a twice differentiable function such that f is continuous at every point in (a, b). Prove that lim h 0 f ( x h) 2 f ( x ) f ( x h) h2 for every x (a, b). f ( x) (6) MA-10 / 40 A MA-11 / 40 A Q.18 Find all critical points of the following function and check whether the function attains maximum or minimum at each of these points: u ( x, y ) x 4 y 4 2 x 2 2 y 2 4 xy, . (x, y) 2. (15) MA-12 / 40 A MA-13 / 40 A Q.19 (a) Let : a, b be differentiable and c, d ( x) : a x b , and let f : c, d be continuous. Let g : a,b be defined by g ( x) ( x) f (t ) dt c for x a, b . Then show that g is differentiable and g ( x) f ( ( x)) ( x) for all x a, b . (b) If f : 0,1 is such that (9) sin x 0 f (t )dt 3 1 x for all x , then find f . 2 2 MA-14 / 40 (6) A MA-15 / 40 A Q.20 Find the area of the surface of the solid bounded by the cone z 3 x 2 y 2 and the paraboloid z 1 x 2 y 2 . (15) MA-16 / 40 A MA-17 / 40 A Q.21 Obtain the general solution of each of the following differential equations: (a) (b) y x dy dy 2 y y e . dx dx (6) dy x 2 y 8 . dx 2 x y 7 (9) MA-18 / 40 A MA-19 / 40 A Q.22 (a) Determine the values of b 1 such that the differential equation x2 d2y dx 2 x dy y 0, 1 x b dx satisfying the conditions y (1) 0 y (b) has a nontrivial solution. (b) Find v( x) such that y ( x) e 4 x v( x) is a particular solution of the differential equation d2y dy 8 16 y 2 x 11 x10 21 x 20 e4 x . 2 dx dx MA-20 / 40 (9) (6) A MA-21 / 40 A Q.23 (a) Change the order of integration in the double integral 2 1 2 x2 f ( x, y ) dy dx . x (6) (b) Let F ( x 2 xy 2 ) i y2 j . Using Green s theorem, evaluate the line integral F dr , where C is the positively oriented closed curve which is the boundary of C the region enclosed by the x axis and the semi-circle y 1 x 2 in the upper half plane. MA-22 / 40 (9) A MA-23 / 40 A Q.24 (a) If F ( x 2 y 4) i , then evaluate the surface integral 3 xy j (2 xz z 2 )k dS , where S is the surface of the cone z 1 x 2 y 2 lying above ( ) n F S . is the unit normal to S making an acute angle with k the xy plane and n (b) Show that the series n 1 x n (1 n p x 2 ) (9) converges uniformly on for p 1 . MA-24 / 40 (6) A MA-25 / 40 A Q.25 (a) Find a value of c such that the following system of linear equations has no solution: x 2 y 3z 1, 3x 7 y cz 2, 2 x cy 12 z 3. (6) (b) Let V be the vector space of all polynomials with real coefficients of degree at most n, where n 2. Considering elements of V as functions from to , define 1 W p V : p ( x)dx 0 . 0 Show that W is a subspace of V and dim W n. MA-26 / 40 (9) A MA-27 / 40 A Q.26 (a) Let A be a 3 3 real matrix with det A 6. Then find det adj A . (6) (b) Let v and v be non-zero vectors in n , n 3, such that v is not a scalar 1 2 2 multiple of v1 . Prove that there exists a linear transformation T : n n such that T 3 T , Tv1 v2 , and T has at least three distinct eigenvalues. MA-28 / 40 (9) A MA-29 / 40 A Q.27 (a) If E is a subset of that does not contain any of its limit points, then prove that E is a countable set. (9) (b) Let f : a, b be a continuous function. If f is uniformly continuous, then prove that there exists a continuous function g : a, b such that g ( x) f ( x) for all x a, b . (6) MA-30 / 40 A MA-31 / 40 A Q.28 (a) On 3 , define a binary operation * as follows: For ( x, y, t ), ( x , y , t ) in 3 , 1 ( x, y, t ) *( x , y , t ) x x , y y , t t ( x y xy ) . 2 Then show that ( 3 , *) is a group, and find its center. (9) (b) For k , let k kn : n . For any m, n , show that I m n is an ideal of . Further, find the generators of I . MA-32 / 40 (6) A MA-33 / 40 A Q.29 Let G be a group of order p 2 , where p is a prime number. Let x G. Prove that y G : xy yx G. (15) MA-34 / 40 A MA-35 / 40 A Space for rough work MA-36 / 40 A Space for rough work MA-37 / 40 A Space for rough work MA-38 / 40 A Space for rough work MA-39 / 40 A Space for rough work MA-40 / 40 A 2011 MA Objective Part (Question Number 1 15) Total Marks Signature Subjective Part Question Number 16 Question Number Marks 23 17 24 18 25 19 26 20 27 21 28 22 29 Total Marks in Subjective Part Total (Objective Part) : Total (Subjective Part) : Grand Total : Total Marks (in words) : Signature of Examiner(s) : Signature of Head Examiner(s) : Signature of Scrutinizer : Signature of Chief Scrutinizer : Signature of Coordinating Head Examiner : MA-iii / 40 Marks

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