Computer Science Study Materials for Competitive Exams

Sample Questions, Previous Year Solved Papers, Study Materials For Competitive Examinations Like UGC NET, SET And GATE Computer Science.

Tuesday, 11 November 2014

UGC NET Computer Science Solved Questions December 2013 Paper 3 - Part 1

1.       If the primal Linear Programming problem has unbounded solution, then it’s dual problem will have
(A) feasible solution
(B) alternative solution
(C) no feasible solution at all
(D) no bounded solution at all
Answer: C
Explanation:
Unboundedness Property: If the primal (dual) problem has an unbounded solution, then the dual (primal) problem is infeasible
2.       Given the problem to maximize f(x), X=(x1,x2,...xn) subject to m number of inequality constraints.
gi(x)≤bi, i=1,2.....,m
including the non-negativity constraints x≥0.
Which one of the following conditions is a Kuhn-Tucker necessary condition for a local maxima at x’ ?
(A) ∂L(X’, λ’, S’)/∂xj = 0, j = 1, 2,...m
(B) λi’[gi(X’)-bi] = 0, i = 1, 2,...m
(C) gi(X’)≤bi, i = 1, 2...m
(D) All of these
Answer: D
3.       The following Linear Programming problem has:
Max                    Z = x1+x2
Subject to          x1-x2≥0
3x1-x2≤-3
and x1, x2≥0
(A) Feasible solution
(B) No feasible solution
(C) Unbounded solution
(D) Single point as solution
Answer: B
4.       Given a flow graph with 10 nodes, 13 edges and one connected components, the number of regions and the number of predicate (decision) nodes in the flow graph will be
(A) 4, 5
(B) 5, 4
(C) 3, 1
(D) 13, 8
Answer: B
Explanation:
Cyclomatic complexity is a software metric. It provides a quantitative measure of the logical complexity of a program.
Cyclomatic complexity has a foundation in graph theory and is computed in one of three ways.
1. The number of regions correspond to the cyclomatic complexity.
2. Cyclomatic complexity V(G) for a flow graph G, is defined as, V(G)=E-N+2
where E=Number of flow graph edges
N=Number of flow graph nodes
3. Cyclomatic complexity, V(G) for a flow graph G, is defined as, V(G)=P+1
where P=Number of predicate nodes contained in flow graph G.
Here, N=10,E=13
V(G)=E-N+2 = 13-10+2 = 3+2 = 5
Therefore, No of regions = 5. (According to rule 1.)
According to rule 3, V(G)=P+1
V(G) refers to the cyclomatic complexity which is equal to the no of regions.
5=P+1
P=5-1=4
So, the number of predicate nodes in the flow graph is 4.
So, the number of regions and the number of predicate nodes in the flow graph will be 5,4
5.       Function points can be calculated by
(A) UFP*CAF
(B) UFP*FAC
(C) UFP*Cost
(D) UFP*Productivity
Answer: A
Explanation:
UFP (Unadjusted Function Point)
CAF (Complexity Adjustment Factor)
Function Point FP = UFP*CAF

6.       Match the following:
List-I
a. Data coupling
b. Stamp coupling
c. Common coupling
d. Content coupling
List-II
i. Module A and Module B have shared data
ii. Dependency between modules is based on the fact they communicate by only
passing of data.
iii. When complete data structure is passed from one module to another.
iv. When the control is passed from one  module to the middle of another.
Codes:
      a  b  c   d
(A) iii  ii   i   iv
(B) ii  iii   i   iv
(C) ii  iii   iv  i
(D) iii  ii   iv  i
Answer: B
Explanation:
Coupling: A measure of how closely connected two routines or modules are; the strength of the relationships between modules. Low coupling is often a sign of a well-structured computer system and a good design.
Types of coupling
Content coupling (high) (Pathological coupling) occurs when one module modifies the internal workings of another module (e.g., accessing local data of another module).
Common coupling (Global coupling) occurs when two modules share the same global data (e.g., a global variable).
External coupling occurs when two modules share an externally imposed data format, communication protocol, or device interface.
Control coupling is one module controlling the flow of another, by passing it
information on what to do (e.g., passing a what-to-do flag).
Stamp coupling (Data-structured coupling) occurs when modules share a composite data structure and use only a part of it. (e.g., passing a whole record to a function that only needs one field of it).
Data coupling occurs when modules share data through, for example, parameters. (e.g., passing an integer to a function that computes a square root).
Message coupling (low): This is the loosest type of coupling. It can be achieved by state decentralization (as in objects) and component communication is done via parameters or message passing.
7.       A process which defines a series of tasks that have the following four primary objectives is known as
1. to identify all items that collectively define the software configuration.
2. to manage changes to one or more of these items.
3. to facilitate the construction of different versions of an application.
4. to ensure that software quality is maintained as the configuration evolves over time.
(A) Software Quality Management Process
(B) Software Configuration Management Process
(C) Software Version Management Process
(D) Software Change Management Process
Answer: B
8.       One weakness of boundary value analysis and equivalence partitioning is
(A) they are not effective.
(B) they do not explore combinations of input circumstances.
(C) they explore combinations of input circumstances
(D) none of the above
Answer: B
9.       Which one of the following is not a software myth?
(A) Once we write the program and get it to work, our job is done.
(B) Project requirements continually change, but change can be easily accommodated
because software is flexible.
(C) If we get behind schedule, we can add more programmers and catch up.
(D) If an organization does not understand how to control software projects internally, it
will invariably struggle when it outsources software projects.
Answer: D
10.    Match the following with respect to relationship between objects and classes:
List-I
a. State diagram
b. Object diagram
c. Class diagram
d. Instance diagram
List-II
i. Useful for both abstract modelling and for designing actual program.
ii. Describes object classes.
iii. Useful for documenting test cases.
iv. Describing the behaviour of a single class of objects.
Codes:
      a   b  c  d
(A) iv   i   ii  iii
(B) ii   iii  iv  i
(C) iii  iv  ii  i
(D) ii   iv  i  iii
Answer: A


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