Saturday, 18 April 2015

UGC NET Computer Science Solved Paper II December 2014 - Part 1

1.       Consider a set A = {1, 2, 3, …….., 1000}. How many members of A shall be divisible by 3 or by 5 or by both 3 and 5 ?
(A) 533   (B) 599
(C) 467 (D) 66
Answer: C
2.       A certain tree has two vertices of degree 4, one vertex of degree 3 and one vertex of degree 2. If the other vertices have degree 1, how many vertices are there in the graph?
(A) 5       (B) n – 3
(C) 20     (D) 11
Answer: D
3.       Consider the Graph shown below :
This graph is a ...............
(A) Complete Graph                (B) Bipartite Graph
(C) Hamiltonian Graph           (D) All of the above
Answer: C
4.       A computer program selects an integer in the set {k : 1 ≤ k ≤ 10,00,000} at random and prints out the result. This process is repeated 1 million times. What is the probability that the value k = 1 appears in the printout atleast once ?
(A) 0.5                (B) 0.704
(C) 0.632121    (D) 0.68
Answer: C
5.       If we define the functions f, g and h that map R into R by :
f(x) = x4, g(x)=√(x2+1), h(x) = x2+72, then the value of the composite functions ho(gof) and (hog)of are given as
(A) x8 – 71 and x8 – 71
(B) x8 – 73 and x8 – 73
(C) x8 + 71 and x8 + 71
(D) x8 + 73 and x8 + 73
Answer: D

6.       The BCD adder to add two decimal digits needs minimum of
(A) 6 full adders and 2 half adders
(B) 5 full adders and 3 half adders
(C) 4 full adders and 3 half adders
(D) 5 full adders and 2 half adders
Answer: D
7.       The Excess-3 decimal code is a self-complementing code because
(A) The binary sum of a code and its 9’s complement is equal to 9.
(B) It is a weighted code.
(C) Complement can be generated by inverting each bit pattern.
(D) The binary sum of a code and its 10’s complement is equal to 9.
Answer: A, C
8.       How many PUSH and POP operations will be needed to evaluate the following expression by reverse polish notation in a stack machine (A * B) + (C * D/E) ?
(A) 4 PUSH and 3 POP instructions
(B) 5 PUSH and 4 POP instructions
(C) 6 PUSH and 2 POP instructions
(D) 5 PUSH and 3 POP instructions
Answer: B
9.       The range of representable normalized numbers in the floating point binary fractional representation in a 32-bit word with 1-bit sign, 8-bit excess 128 biased exponent and 23 bit mantissa is
(A) 2–128 to (1 – 2–23) × 2127
(B) (1 – 2–23) × 2–127 to 2128
(C) (1 – 2–23) × 2–127 to 223
(D) 2–129 to (1 – 2–23) × 2127
Answer: D
10.    The size of the ROM required to build an 8-bit adder/subtractor with mode control, carry input, carry output and two’s complement overflow output is given as
(A) 216 × 8          (B) 218 × 10
(C) 216 × 10       (D) 218 × 8
Answer: B


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