UGC NET Computer Science DEC 2013 Paper - II Solutions

Ram Pothuraju

 1. When data and acknowledgement are sent in the same frame, this is called as
(A) Piggy packing
(B) Piggy backing
(C) Back packing
(D) Good packing

2. Encryption and Decryption is the responsibility of Layer.
(A) Physical
(B) Network
(C) Application
(D) Datalink

3. An analog signal carries 4 bits in each signal unit. If 1000 signal units are sent per second, then baud rate and bit rate of the signal are and
(A) 4000 bauds \ sec & 1000 bps
(B) 2000 bauds \ sec & 1000 bps
(C) 1000 bauds \ sec & 500 bps
(D) 1000 bauds \ sec & 4000 bps

4. The VLF and LF bauds use propagation for communication.
(A) Ground          (B) Sky
(C) Line of sight   (D) Space

5. Using the RSA public key crypto system, if p = 13, q = 31 and d = 7, then the value of e is
(A) 101  (C) 105
(B) 103  (D) 107

6. FAN IN of a component A is defined as
(A) Number of components that can call or pass control to component A.
(B) Number of components that are called by component A.
(C) Number of components related to component A.
(D) Number of components dependent on component A.

7. The relationship of data elements in a module is called
(A) Coupling
(B) Modularity
(C) Cohesion
(D) Granularity

8. Software Configuration Management is the discipline for systematically controlling
(A) the changes due to the evolution of work products as the project proceeds.
(B) the changes due to defects (bugs) being found and then fixed.
(C) the changes due to requirement changes
(D) all of the above

9. Which one of the following is not a step of requirement engineering ?
(A) Requirement elicitation
(B) Requirement analysts
(C) Requirement design
(D) Requirement documentation

10. Testing of software with actual data and in actual environment is called
(A) Alpha testing
(B) Beta testing
(C) Regression testing
(D) None of the above

11. The student marks should not be greater than 100. This is
(A) Integrity constraint
(B) Referential constraint
(C) Over-defined constraint
(D) Feasible constraint

12. GO  BOTTOM  and  SKIP-3 commands are given one after another in a database file of 30 records. It shifts the control to
(A) 28th record      (B) 27th record
(C) 3rd record       (D) 4th record

13. An ER Model includes
I.   An ER diagram portraying entity types.
II.  Attributes for each entity type
III. Relationships among entity types.
IV.  Semantic integrity constraints that reflects the business rules about data not captured in the ER diagram.
(A) I, II, III & IV   (B) I&IV
(C) I, II & IV        (D) I & III

14. Based on the cardinality ratio and participation associated with a relationship type, choose either the Foreign Key Design, the Cross Referencing Design or Mutual Referencing Design.
(A) Entity    (B) Constraints
(C) Rules    (D) Keys

15. Data Integrity control uses  
(A) Upper and lower limits on numeric data.
(B) Passwords to prohibit unauthorised access to files.
(C) Data dictionary to keep the data
(D) Data dictionary to find last access of data

16. What does the following declaration mean ?
int (*ptr) [10];
(A) ptr is an array of pointers of 10 integers.
(B) ptr is a pointer to an array of 10 integers.
(C) ptr is an array of 10 integers.
(D) none of the above.

17. Which of the following has compilation error in C ?
(A) int n = 32 ;
(B) char ch = 65 ;
(C) float f= (float) 3.2;
(D) none of the above

18. Which of the following operators can not be overloaded in C+ + ?
(A) *     (B) + =
(C) = =     (D) ::

19. allows to create classes which are derived from other classes, so that they automatically include some of its "parent's" members, plus its own members.
(A) Overloading
(B) Inheritance
(C) Polymorphism
(D) Encapsulation

20. The correct way to round off a floating number x to an integer value is
(A) y = (int)(.r + 0.5)
(B) y = int (x + 0.5)
(C) y = (int)*+ 0.5
(D) y = (int)((im> + 0.5)

21. What is the value of the postfix expression ?
a b c d + - * (where a = 8, b = 4, c = 2 and d = 5)
(A) -3/8    (B) -8/3
(C) 24        (D) -24

22. If the queue is implemented with a linked list, keeping track of a front pointer and a rear pointer, which of these pointers will change during an insertion into a non-empty queue ?
(A) Neither of the pointers change
(B) Only front pointer changes
(C) Only rear pointer changes
(D) Both of the pointers changes

23. _________ is often used to prove the correctness of a recursive function.
(A) Diagonaliization
(B) Communitivity
(C) Mathematical Induction
(D) Matrix Multiplication

24. For any B-tree of minimum degree t > 2, every node other than the root must have atleast _________ keys and every   node can have at, most ________ keys.
(A) t-1,2t+1
(B) t+1,2t+1
(C) t-1,2t-1
(D) t+1,2t-1

25. Given two sorted list of size 'm' and 'n' respectively. The number of comparison needed in the worst case
by the merge sort algorithm will be
(A) m x n
(B) max (m, n)
(C) min (m, n)
(D) m + n - 1

26. Given the following statements :
S, :    SLR uses follow information to guide reductions. In case of LR and LALR parsers, the look-aheads are associated with the items and they make use of the left context available to the parser.
S2 : LR grammar is a larger sub¬class of context free grammar as compared to that SLR and LALR grammars.
Which of the following is true ?
(A) S1 is not correct and S2 is not correct.
(B) S1 is not correct and S2 is correct.
(C) S1 is correct and S2 is not correct.
(D) S1 is correct and S2 is correct.

27. The context  free grammar for the language
L = {an bm | n < m + 3, n > 0, in > 0} is
(A)   S -» aaa A; A -» aAb | B, B -> Bb | X ,;,
(B)    S -* aaaA|X, A -> aAb | B, B -*Bb f X
(C)    S -> aaaA | aa A | X, A -> aAb | B, B ~* Bb| k
(D)    S -> aaaA | aa A | aA | X, A -> aAb i B, B -» Bb | X

28. Given the following statements :
S1 :    If L is a regular language then the language {uv | u e L, v e LR} is also regular.
S2 :    L = {wwR}| is regular language.
Which of the following is true ?
(A) S1 is not correct and S2 is not correct.
(B) S1 is not correct and S2 is correct.
(C) S1 is correct and S2 is not correct.
(D) S1 is correct and S2 is correct.

29. The process of assigning load addresses to the various parts of the program and adjusting the code and data in the program to reflect the assigned addresses is called    ____________
(A) Symbol resolution
(B) Parsing
(C) Assembly
(D) Relocation

30. Which of the following derivations does a top-down parser use while parsing an input string ? The input is scanned from left to right.
(A) Leftmost derivation
(B) Leftmost derivation traced out in reverse
(C) Rightmost derivation traced out in reverse
(D) Rightmost derivation

31. The dual of a Boolean expression is obtained by interchanging
(A) Boolean sums and Boolean products
(B) Boolean sums and Boolean products or interchanging 0's and 1 's
(C) Boolean sums and Boolean products and interchanging 0's & 1's
(D) Interchanging 0's and 1's

32. Given that (292) 10 = (1204)^ in some number system x. The base x of that number system is
(A) 2
(B) 8
(C) 10
(D) None of the above

33. The sum of products expansion for the function
F(x, y, z) = (x + y)z is given as
(A) xyz + xyz + xyz
(B) xyz + xyz + xyz
(C) xyz + xyz + xyz
(D) xyz + xyz + xyz

34. Let P(m, n) be the statement
    "m divides n" where the universe of    discourse for both the variables is the set of positive integers.  Determine the truth values of each of the following propositions:
    I:   VmVnP(m,n),
    II. 3m Vn P(m, n)
(A) Both I and II are true
(B) Both I and II are false
(C) I - false & II - true
(D) I - true & II - false

35. Big - 0 estimate for
    f(x) = (x + 1) log(x2 + 1) + 3x2 is given as
(A) O(xlogx)
(B) O(x2)
(C) O(x3)
(D) O(x2logx)

36. How many edges are there in a forest of t-trees containing a total of n vertices ?
(A) n+1
(B) n-t
(C) n*t
(D) nt

37. Let f and g be the functions from the set of integers to the set integers defined by
f(x) = 2x + 3 and g(x) = 3x + 2
Then the composition of f and g and g and f is given as
(A) 6x + 7,  6x + 11
(B) 6x + 11, 6x + 7
(C) 5x + 5, 5x + 5
(D) None of the above

38. If n and r are non-negative integers and n > r, then p(n + 1, r) equals to
(A) P(n,r)(n + 1) / (n + 1 - r)
(B) P(n,r)(n+1) / (n - 1 + r)
(C) p(n,r)(n-l) / (n + 1 - r)
(D) p(n,r)(n + l) / (n + 1 + r)

39. A graph is non-planar if and only if it contains a subgraph homomorphic to
(A) K3,2 or K5       (B) K3,3 and K6
(C) K3,3 or K5       (D) K2,3 and K5

40. Which of the following statements are true ?
I.   A circuit that adds two bits, producing a sum bit and a carry bit is called half adder.
II.  A circuit that adds two bits, producing a sum bit and a carry bit is called full adder.
III. A circuit that adds two bits and a carry bit producing a sum bit and a carry bit is called full adder.
IV.  A device that accepts the value of a Boolean variable as input and produces its complement is called an inverter.
(A) I & II    (B) II & III
(C) I,II,III    (D) I,III & IV

41 Active X controls are Pentium binary programs that can be embedded in ____________
(A) Word pages
(B) URL pages
(C) Script pages
(D) Web pages

42.    Match the following :
List-I                                                       List - II
a. Wireless Application Environment      i.    HTTP      
b. Wireless Transaction Protocol           ii.    IP
c. Wireless Datagram Protocol             iii    Scripts
d. Wireless                                          iv.    UDP
Codes :      
     a     b     c    d
(A) ii    iv     i    iii
(B) iv    iii     ii    i
(C) iv    iii     i    ii
(D) iii    i     iv    ii

43. Which of the following is widely used inside the telephone system for long-haul data traffic ?
(C) Frame Relay

44. The document standards for EDI were first developed by large business house during the 1970s and are now under the control of the following standard organisation :

45. Electronic Data Interchange Software consists of the following four layers :
(A) Business application, Internal format conversion, Network translator, EDI envelope
(B) Business application, Internal format conversion, EDI translator, EDI envelope
(C) Application layer, Transport layer, EDI translator, EDI envelope
(D) Application layer, Transport layer, IP layer, EDI envelope

46. Consider a preemptive priority based scheduling algorithm based on dynamically changing priority.
Larger priority number implies higher priority. When the process is waiting for CPU in the ready queue
(but not yet started execution), its priority changes at a rate a = 2. When it starts running, its priority changes at a rate b = 1. All the processes are assigned priority value 0 when they enter ready queue. Assume that the following processes want to execute :
Process      Arrival  Service
ID          Time    Time
PI        0     4
P2        1     1
P3        2     2
P4        3     1
The time quantum q = 1. When two processes want to join ready queue simultaneously, the process which has not executed recently is given priority. The finish time of processes PI, P2, P3 and P4 will respectively be
(A) 4, 5, 7 and 8
(B) 8, 2, 7 and 5
(C) 2, 5, 7 and 8
(D) 8, 2, 5 and 7

47. The virtual address generated by a CPU is 32 bits. The Translation Look-aside Buffer (TLB) can hold
total 64 page table entries and a 4-way set associative (i.e. with 4- cache lines in the set). The page size
is 4 KB. The minimum size of TLB tag is
(A) 12 bits
(B) 15 bits
(C) 16 bits
(D) 20 bits

48. Consider a disk queue with request for input/output to block on cylinders
98, 183, 37, 122, 14, 124, 65, 67
in that order. Assume that disk head is initially positioned at cylinder 53 and moving towards cylinder number 0. The total number of head movements using Shortest Seek Time First (SSTF) and SCAN algorithms are respectively
(A) 236 and 252 cylinders
(B) 640 and 236 cylinders
(C) 235 and 640 cylinders
(D) 235 and 252 cylinders

49. How much space will be required to store the bit map of a 1.3 GB disk with 512 bytes block size ?
(A) 332.8 KB
(B) 83.6 KB
(C) 266.2 KB
(D) 256.6 KB

50. Linux operating system uses
(A) Affinity Scheduling
(B) Fair Preemptive Scheduling
(C) Hand Shaking
(D) Highest Penalty Ratio Next

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