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CBSE AISSCE 2016-2017 Marking Scheme for Computer Science
(Sub Code: 083 Paper Code 91/1 Delhi)

Microwave: Data is transmitted based on ​line of sight principle, faster than
radio communication.

(Full 2 marks for any correct difference between Radio Link and Microwave)
OR
(1 Mark for writing correct features of any one wireless medium out of Radio
Link or Microwave)

(b) Amit used a pen drive to copy files from his friend’s laptop to his office computer. 2
Soon his office computer started abnormal functioning. Sometimes it would restart
by itself and sometimes it would stop functioning totally. 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 Worm
(ii) Computer Virus
(iii) Computer Bacteria
(iv) Trojan Horse

Ans (ii) Computer Virus
OR
(iv) Trojan Horse

● Pen drive containing Computer Virus / Trojan Horse was used
before the abnormal functioning started, which might have
corrupted the system files.
● Computer Virus/ Trojan Horse affects the system files and start
abnormal functioning in the computer

(1 Mark for writing any of the options (ii) OR (iv))
(1 Mark for writing any one correct justification)

(c) Jai is an IT expert and a freelancer. He recently used his skills to access the 2
Administrator password for the network server of Megatech Corpn Ltd. and
provided confidential data of the organization to its Director, informing him about
the vulnerability of their network security. Out of the following options (i) to (iv),
which one most appropriately defines Jai.
Justify the reason for your chosen option:
(i) Hacker
(ii) Cracker
(iii) Operator
(iv) Network Admin

Ans (i) Hacker

A Hacker is a person who breaks into the network of an organization
without any malicious intent.

(1 Mark for writing correct option)
(1 Mark for writing correct justification)

(d) Hi Speed Technologies Ltd is a Delhi based organization which is expanding its
office setup to Chandigarh. At Chandigarh office campus, they are planning to
have 3 different blocks for HR, Accounts and Logistics related work. Each block
has number of computers, which are required to be connected in a network for

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