UGC NET DEC 2012

Computer Science- Paper II

 

1. Consider the circuit shown below. In a certain steady state, Y is at logical '1'. What are the possible values of A,B,C?

(A) A=0, B=0, C=1

(B) A=0, B=C=1

(C) A=1, B=C=0

(D) A=B=1, C=1

Ans: Both A & D

 

2. The worst case time complexity of AVL tree is better in comparison to binary search tree for

(A)  Search and Insert Operations

(B) Search and Delete Operations

(C) Insert and Delete Operations

(D) Search, Insert and Delete operations

Ans:D

 

 3. The GSM network is divided into the following three major systems:

(A) SS, BSS, OSS

(B) BSS, BSC, MSC 

(C) CELL, BSC, OSS

(D) SS, CELL, MSC

 Ans: A 

Switching Systems(SS),

Base Station Systems(BSS), 

Operation Support System(OSS)

 

4. The Power Set of the set {Ø}

(A) Ø

(B) { Ø, {Ø}}

(C) {0}

(D) {o, Ø,{Ø}}

 Ans: B

 

5. If the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O blocks are 98, 37, 14, 124, 65, 67.

(A) 239

(B) 310

(C) 321

(D) 325

 Ans:C

 

6. Component Level Design is concerned with

(A) Flow Oriented Analysis

(B) Class Based Analysis

(C) Both of the above

(D) None of the above

Ans: C

 

7. The C Language is

(A) Context free language

(B) Context Sensitive Language

(C) Regular Language

(D) None of the above

Ans:A

 

8. The Mobile Application Protocol(MAP) typically runs on top of which protocol

(A) SNMP(Simple Network Management Protocol)

(B) SMTP (Simple Mail Transfer Protocol)

(C) SS7 (Signalling Systems 7)

(D) HTTP(Hyper Text Transfer Protocol)

 Ans: C

 

9. If a packet arrive with an M-bit value is '1' and a fragmentation offset value is '0', then it is ____________ fragment.

(A) First

(B) Middle

(C) Last

(D) All of the above

Ans: A

If the M bit is 1, that means there is atleast one more fragment(offset). Because the offset value is 0, it is the first fragment.

 

10. The number of bit strings of length eight that will either start with a 1 bit or end with two bits 00 shall be

(A) 32 

(B) 64

(C) 128

(D) 160

Ans: D

Starting with the 1 bit = 128 to 255 = 128 numbers
Ending with 00 = 256/4 = 64 numbers
Half of these 64 numbers start with 1, leaving 32.
Assuming starting with 1 and ending with 00 is counted only once:
128 + 32 = 160

11. In complete design, 'reducing the strength' refers to

(A) Reducing the range of values of input variables

(B) Code Optimization using cheaper machine instructions

(C) Reducing efficiency of program

(D) None of the above

Ans: B

 

12, In which addressing mode, the effective address of the operand is generated by adding a constant value to the contents of register.

(A) Absolute

(B) Indirect

(C) Immediate

(D) Index

Ans: D

 

13. Which of the following is true?

(A) A relation in BCNF is always in 3NF

(B) A relation in 3NF is always in BCNF.

(C) BCNF and 3NF are same

(D) A relation in BCNF is not in 3NF

 Ans:A

 

14. Given memory partition of 100 K, 500 K, 200 K, 300 K and 600 K (in order) and processes of 212 K, 417 K, 112 K and 426 K (in order), using the first-fit algorithm, in which partition would the process requiring 426 K be placed

(A) 500 K

(B) 200 K

(C) 300 K

(D) 600 K

 Ans:D

 

15. What is the size of the Unicode character in Windows Operating System?

(A) 8-bits

(B) 16-bits

(C) 32-bits

(D) 64-bits

Ans:B

 

16. In which tree, for every node the height of its left sub-tree and right sub-tree differ almost by one?

(A) Binary Search Tree

(B) AVL Tree

(C) Threaded Binary Tree

(D) Complete Binary Tree

Ans:B

AVL Balance Condition: For every node in the tree, the heights of its sub-tree and right sub-tree at most 1.

 

17.The design issue of Data Link Layer  in OSI Reference Model is:

(A) Framing

(B) Representation of bits

(C) Synchronization of bits

(D) Connection Control

Ans:A

 

18. Given the following Expressions of a grammar

E -> E*F/F+E/F

F->F-F/id

Which of the following is true?

(A) * has higher precedence than +

(B) - has highed precedence than *

(C) + and - have same precedence

(D) + has higher precedence than *

Ans:B

 

19.The maturity levels used to measure a process are

(A) Initial, Repeatable,Defined, Managed, Optimized

(B) Primary, Secondary,Defined, Managed, Optimized

(C) Initial, Stating,Defined, Managed, Optimized

(D) None of these

Ans:A

Use the acronym “IRDMO” to remember them.

 

20.The Problem of indefinite blockage of low-priority jobs in general priority scheduling algorithm can be solved using:

(A) Parity Bit

(B) Aging

(C) Compaction

(D) Timer

 Ans:B 

A major problem with priority scheduling is indefinite blocking or starvation. A solution to the problem of indefinite blockage of the low-priority process is aging. Aging is a technique of gradually increasing the priority of processes that wait in the system for a long period of time.

 

21. Which API is used to draw a circle?

(A) Circle()

(B) Ellipse()

(C) Round Rect()

(D) Pie()

Ans:B  (maybe)

DrawEllipse()

 

22.In DML, RECONNECT command cannot be used with

(A) OPTIONAL SET

(B) FIXED SET

(C) MANDATOR SET

(D) All of the above

Ans:B

The RECONNECT command can be used with both OPTIONAL and MANDATORY sets, but not with FIXED sets. The RECONNECT command moves a member record from one set instance to another set instance of the same set type. It cannot be used with FIXED sets because a member record cannot be moved from one set instance to another under the FIXED constraint.

 

23. Coaxial Cables are categorized by Radio Government rating are adapted for specialized functions. Category RG-59 with impedance 75 used for

(A) Cable TV

(B) Ethernet

(C) Thin Ethernet

(D) Thick Ethernet

Ans:A

 

24. RAD Stands for

(A) Rapid And Design

(B) Rapid Aided Development

(C) Rapid Application Development

(D) Rapid Application Design

 Ans:C

 

25.  Suppose that someone starts a chain letter. Each person who receives the letter is asked to send it on to four other people. Some people do this, but others do not send any letter. How many people have seen the letter, including the first person, if no one receives more than one letter and if the chain letter ends after there have been 100 peoples who read it but did not send it out? Also find How many people send out the letter?       

(A) 122 & 22

(B) 111 & 11

(C) 133 & 33

(D) 144 & 44

 Ans:C

 

m =4

                     l =100

                     n=?

                     i =?

          For 4-ary tree,

                      n = I + l

                      n = mi+1

         . ^. .    i + l = mi+1

                i+100=4i+1

                    99 =3i

                      i =33

                     n =mi + l

                        =4*33+1

                        =133

  

 26. A hash function f defined as f(key)=key mod 13, with linear probing is used to insert keys 55,58,68,91,27,145. What will be the location of 79?

(A) 1

(B) 2

(C) 3

(D) 4

Ans:C

 

27. Which of the following is true while converting CFG to LL(I) grammar?

(A) Remove left recursion alone

(B) Factoring grammar alone

(C) Both of the above

(D) None of the above

 Ans:C

To convert an arbitrary CFG to an LL(1) grammar we must remove left recursion and left factoring if we can’t remove these then grammar becomes ambiguous and LL(1) parsers can’t parse it. 

 

28. Identify the Risk factors which are associated with Electronic Payment System.

(A) Fraudulent use of Credit Cards.

(B) Sending Credit Card details over Internet

(C) Remote storage of Credit Card details

(D) All of the above

 Ans:D

 

29. Which of the following are two special functions that are meant for handling exception, that occur during exception handling itself?

(A) void terminate() and void unexpected()

(B) non-void terminate() and void unexpected()

(C) void terminate() and non-void unexpected()

(D) non-void terminate() and non-void unexpected()

 Ans:A

 

30.Which of the following memory allocation scheme suffers from external fragmentation?

(A) Segmentation

(B) Pure Demand Paging

(C) Swapping

(D) Paging

 Ans:A

 

31. Basis path testing falls under

(A) System Testing

(B) White Box Testing

(C) Black Box Testing

(D) Unit Testing

 Ans:B

 

32. The User Work Area(UWA) is a set of program variables declared in the host program to communicate the contents of individual records between

(A) DBMS & the Host record

(B) Host Program and Host Record

(C) Host Program and DBMS

(D) Host Program and Host Language

 Ans:C

33. Consider the tree

Using the property of eccentricity of a vertex, find every vertex that is the centre  of the given tree

(A) d & h

(B) c & k

(C) g,b,c,h,i,m

(D) c & h

Ans:D

34. The maximum number of keys stored in a B-Tree of order m and depth d is

(A) m^(d+1)-1

(B) (m^(d+1)-1)/(m-1)

(C) (m-1)(m^(d+1)-1)

(D) (m^(d-1))/(m-1)

Ans: Answer is not there in the list.

the maximum number of keys (records that can be stored in the file) in a B-tree of order = m and depth = d is m^(d - 1).

35. Which of the following is the most powerful parsing method?

(A) LL(I)

(B) Canonical LR

(C) SLR

(D) LALR

Ans:B

 

36. In Unix, which of the following command is used to set the task priority?

(A) init

(B) nice

(C) kill

(D) PS

 Ans:B

 

37. AES is a round cipher based on the Rijnidal Algorithm that uses a 128-bit block of data. AES has three different configurations. ______ rounds with a key size of 128 bits, ________ rounds with a key size of 192 bits and ________ rounds with a key size of 256 bits.

(A) 5,7,15

(B) 10,12,14

(C) 5,6,7

(D) 20,12,14

Ans:B

 

38. Match the following IC families with their basic circuits

a. TTL           1.NAND

b. ECL           2. NOR

c. CMOS       3. Inverter

         a     b    c

(A)    1     2    3

(B)    3     2    1

(C)    2    3     1

(D)    2    1     3

Ans:D

 

39. Match the following with respect to C++ data types

a. User-defined type        1. Qualifier

b. Built-in Type               2. Union

c. Derived Type              3. void

d. Long Double              4. Pointer

 

         a     b    c    d

(A)    2     3    4     1  

(B)    3     1   4      2

(C)    4    1    2     3

(D)    3    4   1      2

Ans:A

 

40. Given an empty stack, after performing push(1), push(2), Pop, Push(3),
push(4),Pop, Pop, Push(5) and pop, what is the value at the top of the stack? 

(A) 4

(B) 3 

(C) 2

(D) 1

Ans:D

 

41. Enumeration is a process of

(A) Declaring a set of integers

(B) Sorting a list of strings

(C) Assigning a legal values possible for a variable

(D) Sequencing a list of operators

Ans:C

 

42.Which of the following mode declaration is used in C++ to open a file for input?

(A) ios::app

(B) ios::ios

(C) ios::file

(D) ios::in

Ans:D

 

43. Data Encryption Technique are particularly used for ________

(A) Protecting data in data communication system.

(B) Reduce Storage Space Requirement

(C) Enhances Data Integrity

(D) Decreases Data Integrity

Ans:A

 

44. Let L be a set accepted by a non-deterministic finite automaton. The number of states in non-deterministic finite automation is |Q|. The maximum number of states in equivalent finite automaton that accepts L is.

(A) |Q|

(B) 2|Q|

(C) 2^(|Q|)-1

(D) 2^(|Q|)

Ans:D

 

45. What is the result of the following expression? (1 &2) + (3 &4)

(A) 1

(B) 3

(C) 2

(D) 0

Ans:D

(1 & 2) + (3 & 4)

=( 001 & 010) + (011 + 100)

=(0) + (0)

The bit-wise AND operator (&) compares each bit of the first operand to the corresponding bit of the second operand. If both bits are 1, the corresponding result bit is set to 1. Otherwise, the corresponding result bit is set to 0.

 

46. Back propagation is a learning technique that adjusts weights in the neural network by propagating weight changes.

(A) Forward from source to sink

(B) Backward from sink to source

(C) Forward from source to hidden

(D) Backward from since to hidden

Ans:B

 

47. Match the following

a. TTL           1.High Fan out

b. ECL           2. Low Propagation Delay

c. CMOS       3. High Power Dissipation

         a     b    c

(A)    3     2    1

(B)    1     2    3

(C)    1    3     2

(D)    3    1    2

Ans:A

 

48. ________ is an umbrella activity that is applied throughout the software engineering process

(A) Debugging

(B) Testing

(C) Designing 

(D) Software Quality Assurance

Ans: D

49. Identify the operation which is commutative but not associate

(A) OR

(B) NOR

(C) EX-OR

(D) NAND

Ans: B & D

50. Given a Relation POSITION(Posing-No, Skill), then query to retreive all distinct pairs of posting-nos requiring skill is 

(A) Select p.posting-no,p.posting-no

      from position p

      where p.skill=p.skill

      and p.posting-no<p.posting-no;

(B) Select p1.posting-no,p2.posting-no

      from position p1,position p2

      where p1.skill=p2.skill

(C) Select p1.posting-no,p2.posting-no

      from position p1,position p2

      where p1.skill=p2.skill     

      and p1.posting-no<p2.posting-no;

(D) Select p1.posting-no,p2.posting-no

      from position p1,position p2

      where p1.skill=p2.skill     

      and p1.posting-no=p2.posting-no;

Ans:C