Tuesday, May 1, 2012

UGC NET December 2008, Computer Science and Application Paper II Solution

UGC NET December 2008, Computer Science and Application Paper II Solution
1 The channel capacity of a band-limited Gaussian channel is given by
(A) B log2 (2+S/N)                                                                             (B) B log2 (1+S/N)
(C )B log10(1+S/N)                                                                            (D) B loge(1+S/N)

2 The graph K 3,4 has _______ edges
(A)3 edges                                                                                   (B) 4 edges
(C )7 edges                                                                                 (D) 12 edges

3 The total number of spanning trees that can be drawn using five labeled vertices is:
(C ) 36

4 Extremely low power dissipation and low cost per gate can be achieved in
                                                                                    (B) C MOS ICS
                                                                                    (D) ECL ICS
5 An example of a universal building block is :
(A) EX-OR Gate
                                                                                    (B) AND Gate
(C ) OR gate
                                                                                            (D) NOR Gate

6 An example of a layer that is absent in broadcast networks is :
(A) Physical layer
                                                                                    (B) Presentation layer
(C ) Network layer
                                                                                    (D) application layer

7 The ATM cell is :
(A) 48 bytes long
                                                                                    (B) 53 bytes long
(C ) 64 bytes long
                                                                                    (D) 69 bytes long

8 Four jobs J1,J2,J3, and J4 are waiting to be run Their expected run times are 9,6,3 and 5 respectively In order to minimize average response time, the jobs should be run in the order:
(A) J1 J2 J3 J4 (B) J4 J3 J2 J1
(C ) J3 J4 J1 J2 (D) J3 J4 J2 J1

9 Suppose it takes 100ns to access page table and 20 ns to access associative memory If the average access time is 28ns, the corresponding hit rate is:
(A) 100 percent
                                                                                    (B) 90 percent
(C ) 80 percent
                                                                                     (D) 70 percent

10 Transmission of N signals , each band limited to Fm Hz by TDM, requires a minimum band-width of
                                                                                          (B) 2 fm
(C ) N fm
                                                                                    (D) 2N fm

11 If a code is ‘t’ error detecting, the minimum hamming distance should be equal to :
(A) t-1
                                                                                    (B) t
(C ) t+1
                                                                                    (D) 2t+1

12 A relation R in {1,2,3,4,5,6} is given by {(1,2),(2,3),(3,4),(4,4),(4,5)} The relation is :
(A) Reflexive
                                            (B) symmetric
(C ) Transitive
                                          (D) not reflexive, not symmetric and not transitive

13 The dual of the switching function x+yz is:
(A) x+yz
                                                                                        (B) x+yz
(C ) x(y+z)
                                                                                    (D) x(y+z)

14 The characteristic equation of D-flip flop is :
(A) Q=1
                                                                                     (B) Q=0
(C ) Q=D
                                                                                    (D) Q=D

15 If four 4 input mulitplexers drive a 4 input multiplexer we get a :
(A) 16 input MUX
                                                                                    (B) 8 input MUX
(C ) 4 input MUX
                                                                                    (D) 2 input MUX

16 The throughput of slotted ALOHA is given by:
(A) S=G
                                                                                            (B) S=GeG
(C ) S=Ge-G
                                                                                    (D) S=eG

17 Congestion control is done by
(A) Network layer
                                                                                    (B) Physical layer
(C ) Presentation layer
                                                                             (D) Application layer

18 Assertion(A): Twisted pairs are widely used as transmission medium
Reasoning(R ): Twisted pairs have adequate performance and low cost

(A) Both (A) and (R ) are true and (R ) is the correct explanation for (A)
(B) Both (A) and (R ) are true but (R ) is not the correct explanation
(C ) (A) is true but (R ) is false
(D) (A) is false but (R ) is true

19 An example of a non-adaptive routing algorithm is:
(A) Shortest path routing
                                          (B) Centralised routing
(C ) Baran’s hot potato algorithm                             (D) Baran’s backward learning algorithm

20 IP address in B class is given by:
                                                                                    (B) 191 . 023 . 21 . 54
(C )  192 . 128 . 32 . 56
                                                                          (D) 10 . 14 . 12 . 34

21 N processes are waiting for I/O A process spends a fraction of its time in I/O wait state The CPU utilization is given by:
(A) 1-P –N
                                                                         (B) 1 – P N
(C ) P N
                                                                               (D) P -N

22 If holes are half as large as processes, the fraction of memory wasted in holes is:
(A) 2 / 3
                                                                         (B) 1 / 2
(C ) 1 / 3
                                                                         (D) 1 / 5

23 An example of a non-premptive scheduling algorithm is:
(A) Round robin
                                                                                 (B) Priority scheduling
(C ) Shortest job first
                                                                         (D) 2 level scheduling

24 An example of a distributed OS is:
(A) Amoeba
                                                                         (B) UNIX
(C ) MS – DOS
                                                                    (D) MULTICS

25 Which one of the following correctly describes a static variable:
(A) It cannot be initialized
(B) It is initialized once at the commencement of execution and cannot be changed during run time
(C ) It retains its value during the life of the program
(D) None of the above

26 The output of the program code
int x = 0;
while ( x < = 10)
if (++x%10==0)
(A) x = 1
                                                                         (B) compilation error
(C ) x = 20
                                                                      (D) none of the above

27 A copy constructor is invoked when : 
(A) a function returns by value                                       (B) an argument is passed by value 
(C ) A function returns by reference                              (D) none of the above

 28 When a language has the capability to produce new data types, it is said to be :
(A) extensible                                                                          (B) encapsulated
 (C ) Overloaded                                                                      (D) none of the above

 29 How many constructors can a class have? 
(A) Zero                                                                          (B) 1 
(C ) 2                                                                                (D) any number

 30 An entity has: 
(i) a set of properties 
(ii) a set of properties and values for all the properties 
(iii) a set of properties and the values for some set of properties may non-uniquely identify an entity (iv) a set of properties and the values for some set of properties may uniquely identify an entity Which of the above are valid? 
(A) (i) only                                                                          (B) (ii) only 
(C ) (iii) only                                                                       (D) (iv) only 

 31 Aggregation is: 
(A) An abstraction through which relationships are treated as lower level entities 
(B) An abstraction through which relationships are treated as higher level entities  
(C) An abstraction through which relationships are not treated at all as entities 
(D) None of the above

32 Suppose R is a relation schema and F is a set of functional dependencies on R Further, suppose R1 and R2 forma a decomposition of R Then the decomposition is a lossless join decomposition of R provided that :
(A) R1∩R2 ->R1 is in F+
(B) R1 ∩ R2->R2 is in F+
(C) Both R1 ∩ R2->R1 and R1 ∩ R2->R3 functional dependencies are in F+
(D)At least one from R1∩R2->R1 and R1 ∩ R2->R2 is in F+

33 In a heap, every element is ________________ of all the elements in the subtree
(A) Maximum
                                                                         (B) minimum
(C ) sum
                                                                                    (D) product

34 If (rear == maxsize – 1) rear=0; else rear=rear+1; is required in :
(A) circular queue
                                                                          (B) linear queue 
(C) stack                                                                                          (D) deque

35 A high performance switching and multiplexing technology that utilizes fixed length packets to carry different types of traffic is :
                                                                         (B) ADSL 
(C) SONET (D) None of the above

36 A conventional LAN bridge specifies only the functions of OSI:
(A) Layers 1 and 2
                                                                         (B) layers 1 through 3 
(C) all layers                                                                                    (D) none of the above

37 An assembly program contains:
(A) Imperative and declarative statements
(B) Imperative statements and assembler directives
(C) Imperative and declarative statements as well as assembler directives
(D) Declarative statements and assembler directives

38 In which addressing mode, the effective address of the operand is generated by adding a constant value to the contents of a register?
(A) Absolute mode
                                                                         (B) immediate mode 
(C) indirect mode                                                                            (D) index mode

39 Which of the following are Assembler directives?
(i) EQU (ii) ORIGIN (iii) START (iv) END
(A) (ii),(iii) and (iv)
                                                                         (B) (i),(iii) and (iv)
(B) (iii) and (iv)
                                                                                 (D) (i),(ii),(iii) and (iv)

40 Which of the following OS treats hardware as a file system?
                                                                         (B) DOS 
(C) Windows NT                                                             (D) none of the above

41 In which of the following, ready to execute processes must be present in RAM?
(A) Multiprocessing
                                                                         (B) multiprogramming 
(C) multitasking                                                                                 (D) all of the above

42 If the executing program size is greater than the existing RAM of a computer, it is still possible to execute the program if the OS supports:
(A) Multitasking
                                                                         (B) virtual memory 
(C) paging system                                                                        (D) none of the above

43 Software Quality Assurance (SQA) encompasses:
(A) Verification
                                                                         (B) validation  
(C) both verification and validation                                        (D) none of the above

44 Which level is called as “defined” in capability maturity model?
(A) Level 0
                                                                         (B) level 3 
(C) level 4                                                                            (D) level 1

45 COCOMO model is used for:
(A) Product quality estimation
                                         (B) product complexity estimation
(C) product cost estimation
                                               (D) all of the above

46 Font sizes are usually expressed in points One point is:
(A) 0.0069 inch
                                                                         (B) 0.0138 inch
(C) 0.0207 inch
                                                                         (D)0.00276 inch

47 Assertion (A): Cellular telephone systems can handle a multitude of users
Reasoning(R ): Cellular telephone systems permit extensive frequency reuse in a small local area
(A) Both (A) and (R ) are true and (R ) is the correct explanation for (A)
(B) Both (A) and (R ) are true but (R ) is not the correct explanation
(C) (A) is true but (R ) is false
(D) (A) is false but (R ) is true

48 E-Commerce involves:
(A)Electronic Data Interchange
                                                                         (B) Electronic mail
(C) Electronic Bulletin boards
                                                                            (D) All of the above

49 An example of a data mining algorithm which uses squared error score function is:
(A) CART algorithm
                                                                         (B) back propagation algorithm 
(C) a priori algorithm                                                                         (D) vector space algorithm

50 (I) Each object in the active directory of windows 2000 has an access control list
(II) The scheme is a blueprint of all objects in the domain of windows 2000 Which of the following is true?
(A) Only (I)
                                                                                      (B) only (II) 
(C) both (I) and (II)                                                                          (d) none of the above

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