Objective Questions Series 2 (1-10)

1) Partial order set is:
a. Reflexive, Transitive
b. Anti Symmetric
c. Symmetric
d. a and b
e. a and c
f. None

if you consider option e then it will become equivalence set..

 2) The Relation R={(1,2),(2,2),(2,3),(3,3),(3,2),(4,4),(4,2)} is Reflexive (True / False)

false a relation will be reflexive if for all x,(x,x) is present here in R there are (2,2)(3,3)(4,4) but no (1,1) so the relation R is not reflexive

3)A B-tree of minimum degree t has maximum pointer in a node
(1) t-1
(2) 2t-1
(3) 2t
(4)t

4) Unix operating system is an example of
(a) batch os
(b) multi user os
(c) partially multi user os
(d) single user os

5) Which of the following allows a simple email service and is responsible for moving messages from one mail server to another?
A. IMAP B. DHCP
C. SMTP D. FTP
E. POP3

6) Device on one network can communicate with devices in another network via a
1. Hub/Switch
2.utility Server
3. File Server
4. Gateway

7) Congestion control is done by:
1.Network layer
2.Physical Layer
3.Transport Layer
4.Application Layer

8) Which storage device is mounted on 'reels'?
1 Floppy Disk
2 Hard Disk
3 Magnetic Tapes
4 CDROM

9) Consider a relation (A,B,C,D,E,F,G,H).And its Functional Dependencies are ABC ->DE, F->FG, H->G, G->H,ABCD->EF.Here the answer is it is in 2nf.

as you see abc is the candidate key and E,F,G,H are the non prime attributes. so no partial dependency is present here as no proper subset of ABC points to any non prime attribute.and here non key points to another non key(condition of 2nf)and transitive dependency also present F--G , G---H SO ANS IS 2NF

10)which type of links are used for a connection between two DTE devices
1. X.21
2. Frame relay
3. ATM
4. Modem