forum_image

Discussion Forum

Interative Forum for discussing any query literally to UGC-NET Computer Science, GATE Computer Science and Computer Sciene and Technology in general.

ugc_net image

UGC-NET Computer Science

Correspondence Courses and Test Series to prepare for UGC-NET computer science and applications

GATE image

GATE

MCQs, Lecture Notes, Ebooks for GATE preparation

freestuff image
jobs image

Jobs Newsfeed

Timely information of various Recruitments.

NextPrev

Answer Key and Solved Questions Paper-3 UGC-NET Computer Science December 2014

1.A hierarchical memory system that uses cache memory has cache access time of 50 nano seconds, main memory access time of 300 nano seconds, 75% of memory requests are for read, hit ratio of 0.8 for read access and write through scheme is used. what will be the average access time of the system for both for read and write requests ?
A.157.5 n.sec.
B.110 n.sec
C.75 n.sec.
D.82.5 n.sec
View/Hide Ans
Explanation
2.For switching from a CPU user mode to the supervisor mode following type of interrupt is most appropriate
A.Internal interrupts
B.External interrupts
C.Software interrupts
D.None of the above
View/Hide Ans
Explanation
3.In a dot matrix printer the time to print a character is 6 m:sec., time to space in between characters is 2 m.sec., and the number of characters in a line are 200. The printing speed of the dot matrix printer in characters per second and the time to print a character line are given by which of the following options?
A.125 chars/second and 0.8 seconds
B.250 chars/second and 0.6 seconds
C.166 chars/second and 0.8 seconds
D.250 chars/second and 0.4 seconds
View/Hide Ans
Explanation
4.Match the following 8085 instructions with the flags:
List - I        List - II a. XCHG     i. only carry flag is affected.
b. SUB     ii. no flags are affected.
c. STC     iii. all flags other than carry flag are affected.
d. DCR     iv. all flags are affected.
a b c d
A.iv i iii ii
B.iii ii i iv
C.ii iii i iv
D.ii iv i iii
View/Hide Ans
Explanation
5.How many times will the following loop be executed?
LXI B, 0007 H
LOP: DCX B
MOV A,B
ORA C
JNZ LOP
A.05
B.07
C.09
D.00
View/Hide Ans
Explanation
6.Specify the contents of the accumulator and the status of the S, Z and CY flags when 8085 microprocessor performs addition of 87 H and 79 H.
A.11, 1 ,1 ,1
B.10, 0 ,1 ,0
C.01, 1, 0, 0
D.00, 0, 1, 1
View/Hide Ans
Explanation
7.Location transparency allows :
I. Users to treat the data as if it is done at one location.
II. Programmers to treat the data as if it is at one location.
III. Managers to treat the data as if it is at one location.
Which one of the following is correct ?
A.I, II and III
B.I and II only
C.II and III only
D.II only
View/Hide Ans
Explanation
8.Which of the following is correct? I. Two phase locking is an optimistic protocol. II. Two phase locking is pessimistic protocol III. Time stamping is an optimistic protocol. IV. Time stamping is pessimistic protocol.
A.I and III
B.II and IV
C.I and IV
D.II and III
View/Hide Ans
Explanation
9.------------------ rules used to limit the volume of log information that has to be handled and processed in the event of system failure involving the loss of volatile information.
A.Write-ahead log
B.Check-pointing
C.Log buffer
D.Thomas
View/Hide Ans
Explanation
10.Let R = ABCDE is a relational scheme with functional dependency set F = {A -> B, B ->C,AC -> D}. The attribute closures of A and E are
A.ABCD,
B.ABCD, E
C.? ,
D.ABC, E
View/Hide Ans
Explanation


Author Does Not claim of any answer these answers are as per expert opinion


Pages: 1 2 3 4 5 6 7 8