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6. (a) State DeMorgan‖s Laws of Boolean Algebra and verify them using
truth table. 2

(b) Draw the Logic Circuit of the following Boolean Expression using
only NOR Gates : 2

(A+B).(C+D)

(c) Derive a Canonical POS expression for a Boolean function G,
represented by the following truth table : 1

X Y Z G(X,Y,Z)
0 0 0 0
0 0 1 0

0 1 0 1
0 1 1 0
1 0 0 1
1 0 1 1

1 1 0 0
1 1 1 1

(d) Reduce the following Boolean Expression to its simplest form using
K-Map : 3
E (U , V , Z , W ) =  (2 , 3 , 6 , 8 , 9 , 10 , 11 , 12 , 13 )

7. (a) Differentiate between communication using Optical Fiber and

Ethernet Cable in context of wired medium of communication
technologies. 2

(b) Janish Khanna used a pen drive to copy files from his friend‖s laptop
to his office computer. Soon his computer started abnormal
functioning. Sometimes it would restart by itself and sometimes it
would stop different applications running on it. Which of the
following options out of (i) to (iv), would have caused the
malfunctioning of the computer ? Justify the reason for your chosen
option : 2
(i) Computer Virus

(ii) Spam Mail
(iii) Computer Bacteria

(iv) Trojan Horse
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