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CBSE AISSCE 2016-2017 Marking Scheme for Computer Science
(Sub Code: 083 Paper Code 91 Outside Delhi)

E(U,V,Z,W)=UZ’+V’Z+U’ZW’
(½ Mark for drawing K-Map with correct variable names)
(½ Mark for correctly plotting 1s in the given cells)
( ½ Mark each for 3 groupings)
( ½ Mark for writing final expression in reduced/minimal form)

NOTE
● Deduct ½ mark if wrong variable names are used
● Deduct ½ mark for any redundant group appearing in final
expression

7 (a) Differentiate between communication using Optical Fiber and Ethernet Cable in 2
context of wired medium of communication technologies.

Ans Optical Fibre
● Very Fast
● Expensive
● Immune to electromagnetic interference
Ethernet Cable -
● Slower as compared to Optical Fiber
● Less Expensive as compared to Optical Fiber
● prone ​to electromagnetic interference

Full 2 marks for any one correct difference between Optical Fibre and
Ethernet Cable
OR
1 Mark for writing correct features of any one wired medium out of Optical
Fibre or Ethernet Cable

(b) Janish Khanna used a pen drive to copy files from his friend’s laptop to his office 2
computer. Soon his office 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:
(i) Computer Virus
(ii) Spam Mail
(iii) Computer Bacteria
(iv) Trojan Horse
Ans (i) Computer Virus
OR

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