Sir,
Please send me the Model Question Papers of MATHEMATICS for P.U. Lecturship exams.
Thank You,
Sir,
Please send me the Model Question Papers of MATHEMATICS for P.U. Lecturship exams.
Thank You,
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Hello,
MATHEMATICAL SCIENCES
PAPER-I (PART-B)
41. Let {xn} be a sequence of non-zero real numbers. Then
1. If xn → a, then a = sup xn.
2. If n 1
n
x
x
+ < 1 ∀n , then xn → 0.
3. If xn < n ∀n , then {xn}diverges.
4. If n ≤ xn ∀ n, then {xn} diverges.
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
1. f is continuous, but f1 need not be.
2. f and f1 are both continuous.
3. If b a > d c, then f is a decreasing function.
4. f is not uniformly continuous.
45. Let
1
n
n
x
∞
= Σ
be a series of real numbers. Which of the following is true?
1. If
1
n x
∞Σ
is divergent, then {xn} does not converge to 0.
2. If
1
n x
∞Σis convergent, then
1
n x
∞Σ
is absolutely convergent.
3. If
1
n x
∞Σ
is convergent, then 2 0 n x → , as n → ∞.
4. If xn → 0, then
1
n x
∞Σ
is convergent.
46. Let f: ‘ →‘ be differentiable with 0 < f ′(x) < 1 for all x. Then
1. f is increasing and f is bounded.
2. f is increasing and f is Riemann integrable on ‘ .
3. f is increasing and f is uniformly continuous.
4. f is of bounded variation.
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. f is differentiable and Riemann integrable on [0, 1].
2. f is uniformly continuous and Riemann integrable on [0, 1].
3. f is continuous, f need not be differentiable on (0, 1) and need not be
Riemann integrable on [0, 1].
4. f need not be uniformly continuous on [0, 1].
48. Let, if possible,
2 2
( , ) (0,0) 2 2
lim sin( )
x y
x y
x y
α
→
+
=
+
,
2 2
( , ) (0,0) 2 2
lim
x y
x y
x y
β
→
−
=
+
. Then
1. α exists but β does not.
2. α does not exists but β exists.
3. α, β do not exist.
4. Both α, β exist.
49. Let f :‘ →‘ be a non-negative Lebesgue integrable function. Then
1. f is finite almost everywhere.
2. f is a continuous function.
3. f has at most countably many discontinuities.
4. 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}.
Let F = : (1) 0
2
⎧⎨ f ∈ X f = ⎫⎬
⎩ ⎭
and G = : (1) 0
2
⎧⎨g ∈ X g ≠ ⎫⎬
⎩ ⎭
.
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
2
n + n
.
2.
2
2
n −n
.
3. n2 − n .
4. n.
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. m(k 1).
2. mk 1.
3. k(m 1).
4. zero.
54. The set of all solutions to the system of equations :
(1 i) x1 ix2 = 0
2x1 + (1 i)x2 = 0
is given by:
1. (x1, x2) = (0, 0).
2. (x1, x2) = (1, 1).
3. (x1, x2) = 1,cos 5 sin 5
4 4
c i
⎛ π π ⎞ ⎜ + ⎟
⎝ ⎠
where c is any complex number.
4. (x1, x2) = cos 3 , sin 3
4 4
c i
⎛ π π ⎞
⎜ ⎟
⎝ ⎠
where c is any complex number.
55. 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. The system of equations has no solution.
2. The system of equations has a solution if and only if it has infinitely many
solutions.
3. The system of equations has a unique solution.
4. 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. All eigenvalues of T are distinct.
2. All eigenvalues of T are real.
3. T has repeated eigenvalues.
4. T has at least one real eigenvalue.
57. A 2 x 2 real matrix A is diagonalizable if and only if :
1. (trA)2 < 4 Det A.
2. (tr A)2 > 4 Det A.
3. (tr A)2 = 4 Det A.
4. Tr A = Det A.
58. Let A be a 3 x 3 complex matrix such that A3 = I (= the 3 x 3 identity matrix).
Then :
1. A is diagnonalizable.
2. A is not diagonalizable.
3. The minimal polynomial of A has a repeated root.
4. All eigenvalues of A are real.
59. 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.
2
2
0 2
0 0
b b b
a ab
a
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
.
2.
2
2
0 2
0 0
a a a
b ab
b
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
.
3.
2
2
0
0
b b b
a a
b a
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
.
4.
2
2
0
0
a a a
b b
a b
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
.
60. The minimal polynomial of the 3 Χ 3 real matrix
0 0
0 0
0 0
a
a
b
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
is:
1. (X a) (X b).
2. (X a)2 (X b).
3. (X a)2 (X b)2.
4. (X a) (X b)2.
61. The characteristic polynomial of the 3 Χ 3 real matrix A =
0 0
1 0
0 1
c
b
a
⎛ − ⎞
⎜ − ⎟ ⎜ ⎟
⎜ − ⎟ ⎝ ⎠
is:
1. X3 + aX2 + bX + c.
2. (Xa) (Xb) (X c).
3. (X1) (Xabc)2.
4. (X1)2 (Xabc).
62. 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. a ≠ 0, a2 + b2 + c2 = 1.
2. a =±1, b = c = 0.
3. a = b = c = 1.
4. a = b = c.
63. Let E = {z ∈ £ : ez = i}. Then E is :
1. a singleton.
2. E is a set of 4 elements.
3. E is an infinite set.
4. E is an infinite group under addition.
64. Suppose {an} is a sequence of complex numbers such that
0
n a
∞Σ
diverges. Then
the radius of convergence R of the power series
0
( 1)
2
n n
n
n
a z
∞
=
Σ − satisfies :
1. R = 3.
2. R < 2.
3. R > 2.
4. R = ∞.
65. Let f, g be two entire functions. Suppose f 2 (z)+ g2 (z) =1, then
1. f(z)f ' (z) + g(z)g' (z) = 0.
2. f and g must be constant.
3. f and g are both bounded functions.
4. f and g have no zeros on the unit circle.
66. The integral 2
2 ( ) z
sin z
z π π = − ∫ where the curve is taken anti-clockwise, equals :
1. -2πi.
2. 2πi.
3. 0.
3. 4πi.
67. Suppose {zn} is a sequence of complex numbers and
0
n z
∞Σ
converges.
Let f : £ → £ be an entire function with f(zn) = n, ∀ n = 0, 1, 2, Then
1. f ≡ 0.
2. f is unbounded.
3. no such function exists.
4. f has no zeros.
68. Let f(z) = cos z and g(z) = cos z2, for z ∈£ . Then
1. f and g are both bounded on £ .
2. f is bounded, but g is not bounded on £ .
3. g is bounded, but f is not bounded on £ .
4. f and g are both bounded on the x-axis.
69. Let f be an analytic function and let 2
0
( ) ( 2) n
n
n
f z a z
∞
=
=Σ − be its Taylor series in
some disc. Then
1. f(n)(0) = (2n)!an
2. f(n)(2) = n!an
3. f(2n)(2) = (2n)!an
4. f(2n)(2) = n!an
70. The signature of the permutation
1 2 3
1 2 1
n
n n n
σ
⎛ ⎞
= ⎜ − − ⎟ ⎝ ⎠
L
is
1. ( )( ) 1 2n − .
2. ( 1)n − .
3. ( ) 1 1 n+ − .
4. ( ) 1 1 n− − .
71. Let α 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 α is an odd permutation. Then which one of the
following is true?
1. k = 4 and m = 6.
2. m = 7.
3. k = 6.
4. m = 8.
72. Let p, q be two distinct prime numbers. then pq 1 + qp 1 is congruent to
1. 1 mod pq.
2. 2 mod pq.
3. p1 mod pq.
4. q1 mod pq.
73. What is the total number of groups (upto isomorphism) of order 8?
1. only one.
2. 3.
3. 5.
4. 6.
74. Which ones of the following three statements are correct?
(A) Every group of order 15 is cyclic.
(B) Every group of order 21 is cyclic.
(C) Every group of order 35 is cyclic.
1. (A) and (C).
2. (B) and (C).
3. (A) and (B).
4. (B) only.
75. Let p be a prime number and consider the natural action of the group 2( ) P GL ’ on
p ’ Χ p ’ . Then the index of the isotropy subgroup at (1, 1) is
1. p2 1.
2. p (p 1).
3. p 1.
4. 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. 2m where m = 1, 2, 3, 4 or 6.
2. 2m where m = 1, 2,L , 11.
3. 212.
4. 2m where m and 12 are coprime to each other.
78. The general and singular solutions of the differential equation
9 1 1 ,
2 2
y = x p− + px where
,
p dy
dx
= are given by
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 = xe3x cos 2x +e3x sin 2x, as one of its solutions, is given by:
1. (D2 + 6D + 13)y = 0.
2. (D2 6D + 13)y = 0.
3. (D2 6D + 13)2y = 0.
4. (D2 + 6D + 13)2y = 0.
80. The particular integral yp(x) of the differential equation
2
2
2
1 , 0
1
x d y x dy y x
dx dx x
+ − = >
+
is given by
1 2
( ) ( ) 1 ( ) p y x x x x
x
= ν + ν
where ν1(x) and ν2(x) are given by
1. 1 2 2 1 2 2
( ) 1 ( ) 0, ( ) 1 ( ) 1
1
x x x x x
x x x
ν ′ − ν ′ = ν ′ − ν ′ =
+
.
2. 1 2 2 1 2 2
( ) 1 ( ) 0, ( ) 1 ( ) 1
1
x x x x x
x x x
ν ′ + ν ′ = ν ′ − ν ′ =
+
.
3. 1 2 2 1 2 2
( ) 1 ( ) 0, ( ) 1 ( ) 1
1
x x x x x
x x x
ν ′ − ν ′ = ν ′ + ν ′ =
+
.
4. 1 2 2 1 2 2
( ) 1 ( ) 0, ( ) 1 ( ) 1
1
x x x x x
x x x
ν ′ + ν ′ = ν ′ + ν ′ =
+
.
81. The boundary value problem
y′′+λ y =0, y(0)=0, y(π )+ k y′(π )=0, is self-adjoint
1. only for k ∈{0, 1}.
2. for all k ∈ (-∞,∞).
3. only for k ∈ [0, 1].
4. only for k ∈( ∞, 1) U(1,∞) .
82. The general integral of z(xp yq) = y2 x2 is
1. z2 = x2 + y2 + f(xy).
2. z2 = x2 y2 + f(xy).
3. z2 = x2 y2 + f(xy).
4. z2 = y2 x2 + f(xy).
83. A singular solution of the partial differential equation z + xp x2y q2 x3pq = 0 is
1.
x2 z
y
= .
2. 2
z x
y
= .
3. 2
z y
x
= .
4.
y2 z
x
= .
84. The characteristics of the partial differential equation
2 2
14 13
2 2 36 z y z 7 y z 0,
x y y
∂ ∂ ∂
− − =
∂ ∂ ∂
are given by
1. 6 1 6 2
x 1 c , x 1 c
y y
+ = − = .
2. 6 1 6 2
x 36 c , x 36 c
y y
+ = − = .
3. 6 1 6 2
6x 7 c , 6x 7 c
y y
+ = − = .
4. 8 1 8 2
6x 7 c , 6x 7 c
y y
+ = − = .
85. The Lagrange interpolation polynomial through (1, 10), (2, 2), (3, 8), is
1. 11x2 −45x +38.
2. 11x2 −45x +36.
3. 11x2 −45x +30.
4. 11x2 −45x + 44 .
86. Newtons method for finding the positive square root of a > 0 gives, assuming
x0 > 0, x0 ≠ a ,
1. 1 2
n
n
n
x x a
x + = + .
2. 1
1
n 2 n
n
x x a
x +
⎛ ⎞
= ⎜ + ⎟
⎝ ⎠
.
3. 1
1
2 n n
n
x x a
x +
⎛ ⎞
= ⎜ − ⎟
⎝ ⎠
.
4. 1
1
2 n n
n
x x a
x +
⎛ ⎞
= ⎜ + ⎟
⎝ ⎠
.
87. The extremal problem
{ 2 2}
0
J[ y(x)] ( y ) y dx
π
= ∫ ′ −
y(0)=1 , y(π )=λ , has
1. a unique extremal if λ = 1.
2. infinitely many extremals if λ = 1.
3. a unique extremal if λ = 1.
4. infinitely many extremal if λ = 1.
88. The functional
1
2 2
0
[ ] ( 1 ) ; (0) 1, (1)
2
J y = ∫ex y + y′ dx y = y =e
attains
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.
89. A solution of the integral equation
0
( ) sinh ,
x
∫ex−tφ t dt = x is
1. φ (x)= e−x .
2. φ (x) = ex .
3. φ (x) = sinh x .
4. φ (x) = cosh x .
90. If ϕ ( p) denotes the Laplace transform of ϕ (x) then for the integral equation of
convolution type
0
( ) 1 2 cos( ) ( ) ,
x
ϕ x = + ∫ x −t ϕ t dt
ϕ ( p) is given by
1.
2
2
1
( 1)
p
p
+
−
.
2.
2
2
1
( 1)
p
p
+
+
.
3.
( 2 )
2
1
( 1)
p
p p
+
−
.
4.
2
2
1
( 1)
p
p p
+
+
.
91. The Lagrangian of a dynamical system is 2 2 2
1 2 11 , L = q&+ q&+ k q then the Hamiltonian
is given by
1. 2 2 2
1 2 1 H = p + p − kq .
2. ( 2 2 ) 2
1 2 1
1
4
H = p + p + kq .
3. 2 2 2
1 2 1 H = p + p + kq .
4. ( 2 2 ) 2
1 2 1
1
4
H = p + p − kq .
92. The kinetic energy T and potential energy V of a dynamical system are given
respectively, under usual notations, by
1 ( 2 sin2 ) ( cos )2
2
T = ⎡⎣A θ +ψ θ + B ψ θ +φ ⎤⎦ & & & &
and V = Mgl cosθ. The generalized momentum pφ is
1. p 2 B cos 2 2 φ = φ&ψ& θ + φ&.
2. ( )2 cos
2
p B φ = ψ& θ +φ& .
3. ( )2 p B cos φ = ψ& θ +φ& .
4. p B( cos ) φ = ψ& θ +φ&.
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. P(NB (7, p) = j 15), for j = 15, 16, L
2. P(NB (7, p) = j 12), for j = 12, 13, L
3. P(NB (10, p) = j 15), for j = 15, 16, L
4. P(NB (10, p) = j 12), for j = 12, 13, L
94. Suppose X and Y are standard normal random variables. Then which of the
following statements is correct?
1. (X, Y) has a bivariate normal distribution.
2. Cov (X, Y) = 0.
3. The given information does not determine the joint distribution of X and
Y.
4. X + Y is normal.
95. Let F be the distribution function of a strictly positive random variable with finite
expectation μ . Define
G(x) = 0
1 (1 ( )) , if 0
0, otherwise
x
F y dy x
μ
⎧
− > ⎪⎨⎪⎩
∫
Which of the following statements is correct?
1. G is a decreasing function.
2. G is a probability density function.
3. G (x) → + ∞ as x → + ∞ .
4. G is a distribution function.
96. Let X1, X2L be an irreducible Markov chain on the state space {1, 2, L }. Then
P(Xn = 5 for infinitely many n) can equal
1. Only 0 or 1.
2. Only 0.
3. Any number in [0, 1].
4. Only 1.
97. X1, X2,L ,Xn is a random sample from a normal population with mean zero and
variance σ 2. Let ί
1
1 n
i
X X
n =
= Σ . Then the distribution of
1
ί
1
( )
n
i
T X X
−
=
= Σ − is
1. tn 1
2. N(0, (n 1) σ 2 )
3. N(0, n 1 2 )
n
σ
+
4. N(0, n 1 2 )
n
σ
−
98. Let X1, X2, L ,Xn be independent exponential random variables with parameters
1, , n λ L λ respectively. Let Y = min (X1, L ,Xn). Then Y has an exponential
distribution with parameter
1.
1
n
i
i
λ
= Σ
2.
1
n
i i
λ
= Π
3. min{ 1, , n λ K λ }
4. max{ 1, , n λ K λ }
99. Suppose x1, x2L ,xn are n observations on a variable X. Then the value of A
which minimizes 2
1
( )
n
i
i
x A
=
Σ − is
1. median of x1, x2L ,xn
2. mode of x1, x2L ,xn
3. mean of x1, x2L ,xn
4. 1 1 min( , , ) max ( , , )
2
n n x L x + x L x
100. Suppose X1, X2, L ,Xn are i.i.d. with density function f(x) = 2, x , 0.
x
θ
θ < θ >
Then
1. 2
ί 1
n 1
i X =
Σ is sufficient for θ
2.
1
min i n i
X
≤ ≤
is sufficient for θ .
3. ί=1 2
ί
n 1
X
Π is sufficient for θ
4. ( ) 1 1
max , min i n i i n i
X X
≤ ≤ ≤ ≤
is not sufficient for θ .
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 α =0.05
1. Does not exist
2. Rejects H0 if X > 0.95
3. Rejects H0 if X > 0.05
4. Rejects H0 for X < C1 or X > C2 where C1, C2 have to be determined.
102. Suppose the distribution of X is known to be one of the following:
2 / 2
1
( ) 1 , ;
2
f x e x x
π
= − −∞< <∞
2
( ) 1 , ;
2
f x e x x = − −∞< <∞
3
( ) 1 , 2 2.
4
f x = − < x <
If X = 0 is observed, then the maximum likelihood estimate of the
distribution of X is
1. f1(x)
2. f2(x)
3. f3(x)
4. Does not exist.
103. 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 < ½) quantile is 0
ξ . An
appropriate test is
1. Sign Test
2. Mann-Whitney Wilcoxon rank sum test
3. Wilcoxon Signed rank test
4. Kolmogorov Smirnov test
104. Suppose Y ~ N (θ ,σ 2 ) and suppose the prior distribution on θ is N(μ,τ 2 ). The
posterior distribution of θ is also
2 2 2 2
2 2 2 2 2 2 N y ,
τ σ σ τ
μ
τ σ τ σ τ σ
⎛ ⎞
⎜⎜ + ⎟⎟ ⎝ + + + ⎠
The Bayes estimator of θ under squared error loss is given by
1.
2
2 2y τ
τ +σ
2.
2
2 2
τ y
τ +σ
3.
2 2
2 2 2 2 y τ σ
μ
τ σ τ σ
+
+ +
4. y.
105. Consider the model
yij = μ + θ(i-1) + β (2j) + εij, i = 1, 2; j = 1, 2,
where yij is the observation under ith treatment and jth block, μ is the general
effect, θ and β are treatment and block parameters respectively and εij are random
errors with mean 0 and common variance σ2. Then
1. μ, θ and β are all estimable
2. θ and β are estimable, μ is not estimable
3. μ and θ are estimable, β is not estimable
4. μ and β are estimable, θ is not estimable
106. Consider a multiple linear regression model y = X β +ε
where y is a n Χ 1 vector of response variables, X is a n Χ p regression matrix,
β is a p Χ 1 vector of unknown parameters and ε is a n Χ 1 vector of
uncorrelated random variables with mean 0 and common variance σ2. Let y be
the vector of least squares fitted values of y and 1( )T
n e = e L e be the vector of
residuals. Then
1.
1
0
n
i
i
e
=
Σ = always
2.
1
0
n
i
i
e
=
Σ = if one column of X is (1,L ,1)T
3.
1
0
n
i
i
e
=
Σ = only if one column of X is (1L ,1)T
4. nothing can be said about
1
n
i
i
e
= Σ
107. Suppose 1~ (0, ) p p X N Χ Σ
% %
where
22
1 1/2 0 0
1/ 2 1 0 0
0 0
0 0
⎛ − ⎞
⎜− ⎟ ⎜ ⎟
Σ=⎜ ⎟
⎜ ⎟
⎜ Σ ⎟
⎜ ⎟
⎝ ⎠
L
L
M M
and Σ22 is positive definite. Then
P (X1 X2 < 0, X1 + X2 ≠ 0│XP >0) is equal to
1. 1/8
2. 1/4
3. 1/2
4. 1
108. Suppose the variance-covariance matrix of a random vector (3 1) X Χ is
4 0 0
0 8 2
0 2 8
⎛ ⎞
= ⎜ ⎟ ⎜ ⎟
⎜ ⎟
⎝ ⎠
Σ .
The percentage of variation explained by the first principal component is
1. 50
2. 45
3. 60
4. 40
109. 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 (σ 2 ) will always satisfy
1. σ 2 ≥10
2. σ 2 =10
3. σ 2 ≤10
4. σ2 ≥ 9
110. For what value of λ , the following will be the incidence matrix of a BIBD?
N =
1 1 0
1 0
0 1 1
λ
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
1. λ = 0
2. λ = 1
3. λ = 4
4. λ = 3
111. With reference to a 22 factorial experiment, consider the factorial effects A, B
and AB. Then the estimates of
1. Only A and B are orthogonal
2. Only A and C are orthogonal
3. Only B and C are orthogonal
4. A, B and C are orthogonal
112. 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. exponential
2. negative binomial
3. weibull
4. normal
113. Consider the problem
max 6 x1 2x2
subject to x1 x2 ≤ 1
3x1 x2 ≤ 6
x1, x2 ≥ 0
This problem has
1. unbounded solution space but unique optimal solution with finite optimum
objective value
2. unbounded solution space as well as unbounded objective value
3. no feasible solution
4. 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 λ and μ , respectively (ρ =λ /μ ). The expected
steady state number of customers in the queueing system is K/2 for
1. ρ =1
2. ρ <1
3. ρ >1
4. anyρ
115. Consider the system of equations
P1x1 + P2x2 + P3x3 + P4x4 = b, where
P1 =
1
2
3
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
, P2 =
0
2
1
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
, P3=
1
4
2
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
, P4=
2
0
0
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
, b =
3
4
2
⎛ ⎞
⎜ ⎟
⎜ ⎟
⎜ ⎟
⎝ ⎠
.
The following vector combination does not form a basis:
1. (P1, P2, P3)
2. (P1, P2, P4)
3. (P2, P3, P4)
4. (P1, P3, P4).