Q1. Paper 3, j15. For the 8 bit word 00111001.the check bits stored would be 0111. When word is read from memory, the check bits are calculated to be 1101.what is the data word that was read from memory?

       1.  10011001.

2.    00011001. 
3.   00111000.
4. 11000110.

Answer 2.

Explanation .
Given 8 bit word 00111001. encoded in d8=0 d7=0 d6=1 d5=1 d4=1 d3=0 d2=0 d1=1.
parity is calculated as 01111  which are written as p8p4p2p1.
p1=1
p2=1
p4=1
p8=0.

encode the string as 
d8d7d6d5p8d4d3d2p4d1p2p1.
001101001111.
check bit at other end is 1101.
c1=1
c2=0
c4=1
c8=1. 
xor(1101,0111)=1010 . its decimal conversion is 10. so 10th bit is changed.
 10th bit is d6.  so we flip it. and we get
00011001

Q75,p3,d14. Which of the following computing models is not an example of distributed computing environment ?

(A) Cloud computing (B) Parallel computing

(C) Cluster computing (D) Peer-to-peer computing

Answer B.

Q74,p3,d14. A Trojan horse is

(A) A program that performs a legitimate function that is known to an operating system or its user and also has a hidden component that can be used for nefarious purposes like attacks on message security or impersonation.

(B) A piece of code that can attach itself to other programs

in the system and spread to other systems when programs are copied or transferred.

(C) A program that spreads to other computer systems by exploiting security holes like weaknesses in facilities for creation of remote processes

(D) All of the above 

Answer A

Q73,p3,d14. Which of the following versions of Windows O.S. contain built-in partition manager which allows us to shrink and expand pre-defined drives ?

(A) Windows Vista (B) Windows 2000

(C) Windows NT (D) Windows 98

 answer A.

Q72,p3,d14. Match the following learning modes w.r.t. characteristics of available information for learning

a. Supervised	i. Instructive information on desired responses specified by a teacher
b. Recording	ii. A priori design information for memory storing
c. Reinforcement	iii. Partial information about desired responses in yes or No
d. Unsupervised	iv. No information about desired responses

Codes :

a b c d

(A) i ii iii iv

(B) i iii ii iv

(C) ii iv iii i

(D) ii iii iv i

Answer A.