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CSIR UGC NET 2008 : MATHEMATICAL SCIENCES - PAPER I

19 pages, 75 questions, 23 questions with responses, 26 total responses,    0    0
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MATHEMATICAL SCIENCES PAPER-I (PART-B) 41. Let {xn} be a sequence of non-zero real numbers. Then If xn a, then a = sup xn. xn +1 If < 1 n , then xn 0. xn If xn < n n , then {xn}diverges. If n xn n, then {xn} diverges. 1. 2. 3. 4. 42. Let {xn} and {yn} be two sequences of real numbers such that xn yn xn+2, n = 1, 2, 3, L 1. {yn}is an bounded sequence. 2. {xn} is an increasing sequence. 3. {xn} and {yn} converge together. 4. {yn} is an increasing sequence. 43. Let f:[0, 1] (0, ) be a continuous function. Suppose f(0) = 1 and f(1) = 7. Then 1. f is uniformly continuous and is not onto. 2. f is increasing and f([0, 1]) = [1, 7]. 3. f is not uniformly continuous. 4. f is not bounded. 44. Let f: [a, b] [c, d] be a monotone and bijective function. then f is continuous, but f 1 need not be. f and f 1 are both continuous. If b a > d c, then f is a decreasing function. f is not uniformly continuous. 1. 2. 3. 4. 45. Let xn be a series of real numbers. Which of the following is true? n =1 1. If x n is divergent, then {xn} does not converge to 0. 1 2. If x n is convergent, then 3. If x n n is absolutely convergent. 1 1 x 2 is convergent, then xn 0 , as n . 1 4. If xn 0, then x n 1 is convergent. be differentiable with 0 < f (x) < 1 for all x. Then f is increasing and f is bounded. f is increasing and f is Riemann integrable on . f is increasing and f is uniformly continuous. f is of bounded variation. 46. Let f: 1. 2. 3. 4. 47. Let fn:[0,1] be a sequence of differentiable functions. Assume that (fn) converges uniformly on [0, 1] to a function f. Then 1. 2. 3. 4. 48. 49. f is differentiable and Riemann integrable on [0, 1]. f is uniformly continuous and Riemann integrable on [0, 1]. f is continuous, f need not be differentiable on (0, 1) and need not be Riemann integrable on [0, 1]. f need not be uniformly continuous on [0, 1]. sin( x 2 + y 2 ) x2 y 2 , = lim . Then Let, if possible, = lim ( x , y ) (0,0) ( x , y ) (0,0) x 2 + y 2 x2 + y 2 1. exists but does not. 2. does not exists but exists. 3. , do not exist. 4. Both , exist. Let f : be a non-negative Lebesgue integrable function. Then 1. 2. 3. 4. f is finite almost everywhere. f is a continuous function. f has at most countably many discontinuities. f 2 is Lebesgue integrable. 50. Let S = {(x, y) 2 : xy = 1 }. then 1. S is not connected but compact. 2. S is neither connected nor compact. 3. S is bounded but not connected. 4. S is unbounded but connected. 51. Consider the linear space X = C[0, 1] with the norm f = sup f (t ) :0 t 1 . { } 1 1 Let F = f X : f ( ) = 0 and G = g X : g ( ) 0 . 2 2 Then 1. F is not closed and G is open. 2. F is closed but G is not open. 3. F is not closed and G is not open. 4. F is closed and G is open. 52. Let V be the vector space of all n x n real matrices, A = [aij] such that aij = -aji for all i, j. Then the dimension of V is: 1. 2. 3. 4. 53. Let n=mk where m and k are integers > 2. Let A = [aij] be a matrix given by aij=1 if for some r = 0, 1, , m-1, rk < i, j < (r+1)k and aij= 0, otherwise. Then the null space of A has dimension : 1. 2. 3. 4. 54. n2 + n . 2 n2 n . 2 n2 n . n. m(k 1). mk 1. k(m 1). zero. The set of all solutions to the system of equations : (1 i) x1 ix2 = 0 2x1 + (1 i)x2 = 0 is given by: 1. 2. 3. 4. 55. (x1, x2) = (0, 0). (x1, x2) = (1, 1). 5 5 (x1, x2) = c 1, cos + i sin where c is any complex number. 4 4 3 3 (x1, x2) = c cos , i sin where c is any complex number. 4 4 Let A be an m x n matrix where m < n. Consider the system of linear equations A x = b where b is an n x 1 column vector and b 0. Which of the following is always true? 1. 2. 3. 4. The system of equations has no solution. The system of equations has a solution if and only if it has infinitely many solutions. The system of equations has a unique solution. The system of equations has at least one solution. 56. Let T be a normal operator on a complex inner product space. Then T is selfadjoint if and only if : 1. 2. 3. 4. 57. A 2 x 2 real matrix A is diagonalizable if and only if : 1. 2. 3. 4. 58. (trA)2 < 4 Det A. (tr A)2 > 4 Det A. (tr A)2 = 4 Det A. Tr A = Det A. Let A be a 3 x 3 complex matrix such that A3 = I (= the 3 x 3 identity matrix). Then : 1. 2. 3. 4. 59. All eigenvalues of T are distinct. All eigenvalues of T are real. T has repeated eigenvalues. T has at least one real eigenvalue. A is diagnonalizable. A is not diagonalizable. The minimal polynomial of A has a repeated root. All eigenvalues of A are real. Let V be the real vector space of real polynomials of degree < 3 and let T : V V be the linear transformation defined by P(t) a Q(t) where Q(t) = P(at + b). Then the matrix of T with respect to the basis 1, t, t2 of V is: 1. b b b2 0 a 2ab . 0 0 a2 2. a a a2 0 b 2ab . 0 0 b2 3. 4. b b b2 a a 0 . 0 b a2 2 a a a b b 0 . 0 a b2 60. 61. 62. a 0 0 The minimal polynomial of the 3 3 real matrix 0 a 0 is: 0 0 b 1. (X a) (X b). 2. (X a)2 (X b). 3. (X a)2 (X b)2. 4. (X a) (X b)2. 0 0 c The characteristic polynomial of the 3 3 real matrix A = 1 0 b is: 0 1 a 3 2 1. X + aX + bX + c. 2. (X a) (X b) (X c). 3. (X 1) (X abc)2. 4. (X 1)2 (X abc). Let e1, e2, e3 denote the standard basis of 3 . Then ae1 + be2 + ce3, e2, e3 is an orthonormal basis of 3 if and only if 1. 2. 3. 4. 63. a 0, a2 + b2 + c2 = 1. a = 1, b = c = 0. a = b = c = 1. a = b = c. Let E = {z : ez = i}. Then E is : 1. 2. 3. 4. a singleton. E is a set of 4 elements. E is an infinite set. E is an infinite group under addition. 64. Suppose {an} is a sequence of complex numbers such that a n diverges. Then 0 the radius of convergence R of the power series n=0 1. 2. 3. 4. R = 3. R < 2. R > 2. R = . an 2 n ( z 1) n satisfies : 65. Let f, g be two entire functions. Suppose f 2 ( z ) + g 2 ( z ) =1 , then 1. 2. 3. 4. 66. f(z)f ' (z) + g(z)g' (z) = 0. f and g must be constant. f and g are both bounded functions. f and g have no zeros on the unit circle. The integral sin z (z ) 2 where the curve is taken anti-clockwise, equals : z =2 1. 2. 3. 3. -2 i. 2 i. 0. 4 i. 67. Suppose {zn} is a sequence of complex numbers and z n converges. 0 Let f : be an entire function with f(zn) = n, n = 0, 1, 2, Then 1. 2. 3. 4. 68. f 0. f is unbounded. no such function exists. f has no zeros. Let f(z) = cos z and g(z) = cos z2, for z . Then 1. 2. 3. 4. f and g are both bounded on . f is bounded, but g is not bounded on . g is bounded, but f is not bounded on . f and g are both bounded on the x-axis. 69. Let f be an analytic function and let f ( z ) = an ( z 2) 2 n be its Taylor series in n =0 some disc. Then 1. 2. 3. 4. f(n)(0) = (2n)!an f(n)(2) = n!an f(2n)(2) = (2n)!an f(2n)(2) = n!an 70. The signature of the permutation 3 L 1 2 n n 1 n 2 = 1. 2. 3. 4. 71. 1 mod pq. 2 mod pq. p 1 mod pq. q 1 mod pq. What is the total number of groups (upto isomorphism) of order 8? 1. 2. 3. 4. 74. k = 4 and m = 6. m = 7. k = 6. m = 8. Let p, q be two distinct prime numbers. then pq 1 + qp 1 is congruent to 1. 2. 3. 4. 73. n 2 Let be a permutation written as a product of disjoint cycles, k of which are cycles of odd size and m of which are cycles of even size, where 4 k 6 and 6 m 8. It is also known that is an odd permutation. Then which one of the following is true? 1. 2. 3. 4. 72. ( 1)( ) . n ( 1) . n +1 ( 1) . n 1 ( 1) . n is 1 only one. 3. 5. 6. Which ones of the following three statements are correct? (A) (B) (C) Every group of order 15 is cyclic. Every group of order 21 is cyclic. Every group of order 35 is cyclic. 1. 2. 3. 4. (A) and (C). (B) and (C). (A) and (B). (B) only. 75. Let p be a prime number and consider the natural action of the group GL2 ( P ) on p p . Then the index of the isotropy subgroup at (1, 1) is 1. 2. 3. 4. p2 1. p (p 1). p 1. p2. 76. The quadratic polynomial X2 + bX + c is irreducible over the finite field 5 if and only if 1. b2 4c = 1. 2. b2 4c = 4. 3. either b2 4c = 2 or b2 4c = 3. 4. either b2 4c = 1 or b2 4c = 4. 77. Let K denote a proper subfield of the field F = GF(212) a finite field with 212 elements. Then the number of elements of K must be equal to 1. 2. 3. 4. 2m where m = 1, 2, 3, 4 or 6. 2m where m = 1, 2, L , 11. 212. 2m where m and 12 are coprime to each other. 78. The general and singular solutions of the differential equation dy 9 1 are given by y = x p 1 + px, where p = dx, 2 2 1. 2cy x2 9c2 = 0, 3y = 2x. 2. 2cy x2 + 9c2 = 0, y = 3x. 3. 2cy +x2 + 9c2 = 0, y = 3x. 4. 2cy + x2 + 9c2 = 0, 3y = 4x. 79. A homogenous linear differential equation with real constant coefficients, which has y = xe 3x cos 2x +e 3x sin 2x, as one of its solutions, is given by: 1. 2. 3. 4. (D2 + 6D + 13)y = 0. (D2 6D + 13)y = 0. (D2 6D + 13)2y = 0. (D2 + 6D + 13)2y = 0. 80. The particular integral yp(x) of the differential equation d2y dy 1 x +x y = , x>0 2 dx dx x +1 is given by 2 1 y p ( x) = x 1 ( x) + 2 ( x) x where 1(x) and 2(x) are given by 1. 2. 3. 4. 81. 1 1 ( x) = . 22 x x +1 1 1 1 ( x) 2 2 ( x) = . x x +1 1 1 1 ( x) + 2 2 ( x) = . x x +1 1 1 1 ( x) + 2 2 ( x) = . x x +1 1 ( x) The boundary value problem y + y = 0, y (0) = 0, y ( ) + k y ( ) = 0, is self-adjoint 1. 2. 3. 4. 82. 1 x 1 ( x) 2 2 ( x) = 0, x 1 x 1 ( x) + 2 2 ( x) = 0, x 1 x 1 ( x) 2 2 ( x) = 0, x 1 x 1 ( x) + 2 2 ( x) = 0, x only for k {0, 1}. for all k (- , ). only for k [0, 1]. only for k ( , 1) U (1, ) . The general integral of z(xp yq) = y2 x2 is 1. 2. 3. 4. z2 = x2 + y2 + f(xy). z2 = x2 y2 + f(xy). z2 = x2 y2 + f(xy). z2 = y2 x2 + f(xy). 83. A singular solution of the partial differential equation z + xp x2y q2 x3pq = 0 is 1. 2. z= 3. z= 4. 84. z= z= The characteristics of the partial differential equation 2 z 2 z z 36 2 y14 2 7 y13 = 0, are given by x y y 1. 2. 3. 4. 85. x2 . y x . y2 y . x2 y2 . x 1 1 = c1 , x 6 = c2 . 6 y y 36 36 x + 6 = c1 , x 6 = c2 . y y 7 7 6 x + 6 = c1 , 6 x 6 = c2 . y y 7 7 6 x + 8 = c1 , 6 x 8 = c2 . y y x+ The Lagrange interpolation polynomial through (1, 10), (2, 2), (3, 8), is 1. 2. 3. 4. 11x 2 45 x + 38 . 11x 2 45 x + 36 . 11x 2 45 x + 30 . 11x 2 45 x + 44 . 86. Newton s method for finding the positive square root of a > 0 gives, assuming x0 > 0, x0 a , x a xn +1 = n + . 1. 2 xn 1 a xn +1 = xn + . 2 xn 1 a xn +1 = xn . xn 2 2. 3. xn +1 = 4. 87. 1 a xn + . xn 2 The extremal problem J [ y ( x)] = {( y ) 2 y 2 } dx 0 y (0) = 1 , y ( ) = , has a unique extremal if = 1. infinitely many extremals if = 1. a unique extremal if = 1. infinitely many extremal if = 1. 1. 2. 3. 4. 88. The functional 1 J [ y] = e x ( y 2 + 0 12 y )dx ; y (0) = 1, y (1) = e 2 attains 89. 1. A weak, but not a strong minimum on ex. 2. A strong minimum on ex. 3. A weak, but not a strong maximum on ex. 4. A strong maximum on ex. A solution of the integral equation x e x t (t )dt = sinh x, is 0 1. 2. 3. 4. ( x) = e x . ( x) = e x . ( x) = sinh x . ( x) = cosh x . 90. If ( p) denotes the Laplace transform of ( x ) then for the integral equation of convolution type x ( x) = 1 + 2 cos( x t ) (t ) dt , 0 ( p) is given by 1. p2 + 1 . ( p 1) 2 2. p2 + 1 . ( p + 1) 2 3. 4. 91. (p 2 + 1) p( p 1) 2 . p2 + 1 . p( p + 1) 2 2 && The Lagrangian of a dynamical system is L = q12 + q2 + k1q12 , then the Hamiltonian is given by 2 H = p12 + p2 kq12 . 1 2 H = ( p12 + p2 ) + kq12 . 2. 4 2 H = p12 + p2 + kq12 . 3. 1 2 H = ( p12 + p2 ) kq12 . 4. 4 The kinetic energy T and potential energy V of a dynamical system are given respectively, under usual notations, by 1. 92. 1 && & & T = A( + 2 sin 2 ) + B ( cos + ) 2 2 and V = Mgl cos . The generalized momentum p is 1. && & p = 2 B cos + 2 2 . 2. 3. B &2 & cos + . 2 &2 & p = B cos + . 4. p ( ) ( ) & & = B ( cos + ) . p = 93. Consider repeated tosses of a coin with probability p for head in any toss. Let NB(k,p) be the random variable denoting the number of tails before the kth head. Then P(NB(10,p) = j 3rd head occurred in 15th toss) is equal to 1. 2. 3. 4. 94. Suppose X and Y are standard normal random variables. Then which of the following statements is correct? 1. 2. 3. 4. 95. P(NB (7, p) = j 15), for j = 15, 16, L P(NB (7, p) = j 12), for j = 12, 13, L P(NB (10, p) = j 15), for j = 15, 16, L P(NB (10, p) = j 12), for j = 12, 13, L (X, Y) has a bivariate normal distribution. Cov (X, Y) = 0. The given information does not determine the joint distribution of X and Y. X + Y is normal. Let F be the distribution function of a strictly positive random variable with finite expectation . Define 1 x (1 F ( y )) dy, if x > 0 G(x) = 0 0, otherwise Which of the following statements is correct? 1. 2. 3. 4. 96. G is a decreasing function. G is a probability density function. G (x) + as x + . G is a distribution function. Let X1, X2 L be an irreducible Markov chain on the state space {1, 2, L }. Then P(Xn = 5 for infinitely many n) can equal 1. 2. 3. 4. Only 0 or 1. Only 0. Any number in [0, 1]. Only 1. 97. X1, X2, L ,Xn is a random sample from a normal population with mean zero and n 1 1n variance 2 . Let X = X . Then the distribution of T = ( X X ) is n i =1 i =1 1. 2. 3. 4. 98. tn 1 N(0, (n 1) 2 ) n +1 2 ) N (0, n n 1 2 ) N (0, n Let X1, X2, L ,Xn be independent exponential random variables with parameters 1 ,L , n respectively. Let Y = min (X1, L , Xn). Then Y has an exponential distribution with parameter 1. n i =1 i n 2. 3. 4. 99. i min{ 1 ,K , n } max{ 1 ,K , n } i =1 Suppose x1, x2 L ,xn are n observations on a variable X. Then the value of A n which minimizes ( xi A) 2 is i =1 1. 2. 3. 4. 100. median of x1, x2 L ,xn mode of x1, x2 L ,xn mean of x1, x2 L ,xn min( x1 ,L , xn ) + max ( x1 ,L , xn ) 2 Suppose X1, X2, L , Xn are i.i.d. with density function f(x) = Then 1. n 1 X =1 2 is sufficient for i 2. min X i is sufficient for . 3. 4. ( max X , min X ) is not sufficient for . 1 i n 1 is sufficient for =1 X 2 n 1 i n i 1 i n i x2 , < x , > 0. 101. Suppose X is a random variable with density function f(x). To test H0 : f(x) = 1, 0 < x < 1, vs H1: f (x) = 2x, 0 < x < 1, the UMP test at level = 0.05 1. 2. 3. 4. 102. Does not exist Rejects H0 if X > 0.95 Rejects H0 if X > 0.05 Rejects H0 for X < C1 or X > C2 where C1, C2 have to be determined. Suppose the distribution of X is known to be one of the following: f1 ( x) = 1 x2 / 2 e , < x < ; 2 1 x f 2 ( x) = e , < x < ; 2 1 f3 ( x) = , 2 < x < 2. 4 If X = 0 is observed, then the maximum likelihood estimate of the distribution of X is 1. 2. 3. 4. 103. f1(x) f2(x) f3(x) Does not exist. Suppose Xi, i = 1, 2, L , n, are independently and identically distributed random variables with common distribution function F( ). Suppose F( ) is absolutely continuous and the hypothesis to be tested is pth (0 < p < ) quantile is 0 . An appropriate test is 1. 2. 3. 4. Sign Test Mann-Whitney Wilcoxon rank sum test Wilcoxon Signed rank test Kolmogorov Smirnov test 104. Suppose Y ~ N ( , 2 ) and suppose the prior distribution on is N ( , 2 ). The 2 2 2 y+ 2 , 2 posterior distribution of is also N 2 + 2 + 2 + 2 The Bayes estimator of under squared error loss is given by 2 1. 2. 2y 2 + 2 3. 2 2 y+ 2 2 + 2 + 2 4. 105. 2 y 2 + 2 y. Consider the model yij = + (i-1) + (2 j) + ij, i = 1, 2; j = 1, 2, where yij is the observation under ith treatment and jth block, is the general effect, and are treatment and block parameters respectively and ij are random errors with mean 0 and common variance 2. Then 1. 2. 3. 4. 106. , and are all estimable and are estimable, is not estimable and are estimable, is not estimable and are estimable, is not estimable Consider a multiple linear regression model y = X + where y is a n 1 vector of response variables, X is a n p regression matrix, is a p 1 vector of unknown parameters and is a n 1 vector of uncorrelated random variables with mean 0 and common variance 2. Let y be the vector of least squares fitted values of y and e = (e1 L en )T be the vector of residuals. Then 1. n e = 0 always i =1 2. n e = 0 if one column of X is (1,L i =1 3. i n ,1)T e = 0 only if one column of X is (1L i =1 4. i i nothing can be said about n e i =1 i ,1)T 107. Suppose X p 1 ~ N p (0, ) where % % 1/ 2 0 L 1 1 0L 1/ 2 = 0 0 M 22 M 0 0 and 22 is positive definite. Then 0 0 P (X1 X2 < 0, X1 + X2 0 XP >0) is equal to 108. 1. 1/8 2. 1/4 3. 1/2 4. 1 Suppose the variance-covariance matrix of a random vector X ( 3 1) is 4 0 0 = 0 8 2 . 0 2 8 The percentage of variation explained by the first principal component is 1. 2. 3. 4. 109. 50 45 60 40 A population consists of 10 students. The marks obtained by one student is 10 less than the average of the marks obtained by the remaining 9 students. Then the variance of the population of marks ( 2 ) will always satisfy 1. 2. 3. 4. 2 10 2 = 10 2 10 2 9 110. For what value of , the following will be the incidence matrix of a BIBD? 1. 2. 3. 4. 111. With reference to a 22 factorial experiment, consider the factorial effects A, B and AB. Then the estimates of 1. 2. 3. 4. 112. Only A and B are orthogonal Only A and C are orthogonal Only B and C are orthogonal A, B and C are orthogonal Let X be a r.v. denoting failure time of a component. Failure rate of the component is constant if and only if p.d.f. of X is 1. 2. 3. 4. 113. =0 =1 =4 =3 1 1 0 N = 1 0 0 1 1 exponential negative binomial weibull normal Consider the problem max 6 x1 2x2 subject to x1 x2 1 3x1 x2 6 x1, x2 0 This problem has 1. 2. 3. 4. unbounded solution space but unique optimal solution with finite optimum objective value unbounded solution space as well as unbounded objective value no feasible solution unbounded solution space but infinite optimal solutions with finite optimum objective value 114. Consider an M/M/1/K queuing system in which at most K customers are allowed in the system with parameters and , respectively ( = / ). The expected steady state number of customers in the queueing system is K/2 for 1. 2. 3. 4. 115. =1 <1 >1 any Consider the system of equations P1x1 + P2x2 + P3x3 + P4x4 = b, where 1 0 1 2 3 P1 = 2 , P2 = 2 , P3= 4 , P4= 0 , b = 4 . 3 1 2 0 2 The following vector combination does not form a basis: 1. 2. 3. 4. (P1, P2, P3) (P1, P2, P4) (P2, P3, P4) (P1, P3, P4).

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Additional Info : CSIR UGC (National Eligibility Test) NET New Exam Scheme December 2008 Model Question Paper - Mathematical Sciences Paper II Joint CSIR UGC NET Exam Question Papers
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