j12CsPII11-20

UGC NET Computer Science (Paper-II) June -2012   [1-10]  [11-20]  [21-30] [31-40]

11.B+ tree are preferred to binary tree in Database because
Disk capacity are greater than memory capacities
Disk access is much slower than memory access
Disk data transfer rates are much less than memory data transfer rate
Disks are more reliable than memory

12. A Transaction Manager is which of the following ?
Maintains a log of transactions
Maintains before and after database images
Maintains appropriate concurrency control
All of the above

13.Leaves of which of the following trees are at the same level ?
Binary tree
B-tree
AVL-tree
Expression tree

14. Which of the following TCP/IP Internet protocol is diskless machine uses to obtain its IP address from a server ?
RAP
RIP
ARP
X.25

15.Decryption and encryption of data are the responsibility of which of the following layer ?
Physical layer
Data Link layer
Presentation layer
Session layer

16.In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM ?
Space division
Time division
Virtual
Packet

17. In which Routing Method do all the routers have a common database ?
Distance vector
Link state
Link vector
Dijkestra method

18.Page Shift Keying (PSK) Method is used to modulate digital signal at 9600 bps using 16 level. Find the line signals and speed (i.e. modulation rate).
2400 bauds
1200 bauds
4800 bauds
9600 bauds

19. The station to hub distance in which it is 2000 metres.
100 Base-T_x
100 Base-F_x
100 Base-T₄
100 Base-T₁

20.Main aim of software engineering is to produce
program
software
within budget
software within budget in the given schedule

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