Computing Intermediate - Marking Scheme – May 2010
A1 a.
b.
c.
A2 a.
b.
A3 a.
b.
A4 a.
b.
c.
A5 a.
b.
c.
Barcode reader to identify products.
1 mark for device and 1 mark for justification.
Printer to issue customer receipts.
1 mark for device and 1 mark for justification.
Memory disc to save images or data.
1 mark for device and 1 mark for justification.
Similarity – both are storage units, random access to data, volatile.
1 mark for one similarity.
Difference – Dynamic: continuously refreshed.
Static: faster, more expensive
1 mark for difference.
i. Two from: Address, Data, Control
1 mark each for any two
ii.Two from: Address bus – addresses to memory, Data bus – data/instructions,
Control bus – control signals (R/W etc)
1 mark each for any two.
Assembling, linking, loading.
1 mark each.
Assembling: Translate each command into machine code.
Linking: Inserting any pre-translated code.
Loading: Passing code over to CU to execute the code.
1 mark each.
A loop structure is a code sub-section that requires repetition.
1 mark.
While - Pre-tested (may not be executed at all)
Repeat - Post-tested (must be executed at least once)
For – predetermined number of repetitions
Nested For; and Nested loops.
1 mark each for any three.
Two program snippets in Java on any two of above.
1 mark each.
Yes.
1 mark
Adaptive, Corrective and Perfective.
1 mark each.
Outline of any two of the above.
1 mark each
1
A6
a.
b.
c.
A7
a.
b.
c.
A8
a.
b.
Improved data consistency and portability, control over redundancy, greater
security.
1 mark each for any two.
To reduce duplicate data.
1 mark
i. Object-Oriented, Hierarchical, Network models.
1 mark for any one
ii. Relational is the linking of two or more files together; while O-O’s are those
that accept objects.
1 mark each.
Three relevant fields from Students and Books tables.
1½ marks for 3 fields in each table.
Relevant primary key in each table with justification.
1 mark for key and 1 mark for justification.
Transactions or Loans – table to identify student with book borrowed.
1 mark
E+Ā+Ō
2 marks for correct literals; 1 mark for correct ‘Ors’; 1 mark for correct ‘Nots’.
Vide truth table below.
1 mark for each correct last two columns.
A
0
0
1
1
A9
(A + E)
1
0
0
0
(Ā.Ē)
1
0
0
0
a. i. Computer control of a machine through automatic response to the feedback
signals from sensors.
1 mark.
ii. 1 mark for a relevant situation. 1mark for brief explanation.
b. i. File access restriction or other relevant reason.
1 mark
ii. Using alphanumeric, change frequently or other relevant answers.
1 mark each for any two.
A10 a.
b.
c.
B1
E
0
1
0
1
a.
Metropolitan Area Network, Wide Area Network.
1mark for both
Geographical area and other relevant answer.
1 mark each for any two.
One relevant situation for each of the 3 types of network.
1 mark each.
i. E-Learning is a term that encompasses all forms of Technology-Enhanced
Learning (TEL) or very specific types of TEL such as online or Web-based
learning.
2 marks
ii. Web-based tuition and other relevant example.
2 marks
2
b.
c.
B2
a.
b.
c.
i. E-learning is considered a complementary form to face-to-face (F2F) learning
which by far the most effective style and most traditional.
2 marks each for two differences
ii. E-learning proceeds at the pace of the student.
F2F is personalised with a human touch.
1 mark each
iii. E-learning requires students to have a computer.
F2F can be done anywhere and depends solely on the student.
1 mark each
i. Relevant explanation of Virtual Learning Environment
2 marks
ii. WebCT, Blackboard, Moodle or other relevant answers.
1 mark each for any three.
iii. Three from Podcasts, Presentations, Tutorials, Videos, Course notes.
1 mark each for any three.
i.
Allows different computers from different suppliers, located anywhere to
communicate with each other.
1 mark
ii. Application layer, Transport layer, Network layer and Data Link layer.
1 mark each
• Application layer: Provides application access to the communication
environment;
• Transport layer: divides the data passed to it from the application layer
into packets for the network layer to send;
• Network layer: the IP provides source and destination addressing,
sequencing and routing in the TCP/IP suite;
• Data Link layer: handles the physical details of interfacing with the cable.
1 mark each
iii. Allows messages to travel from one part of a network to another. A relevant
example.
1 mark for explanation. 1mark for example.
iv. First part - Network address. Second part - Host address.
1 mark each
v. 32 or 128 for IPv6.
1 mark
i. Domain Name System.
1 mark
ii. To assign a host name to every device on the Internet corresponding to the
IP address.
2 marks
Circuit – a dedicated physical path exists between sending and receiving
computers
Message – a permanent path is set up between two node computers which may
be used for short-duration messages
Packet – a message switching network in which messages are split up into
packets ready for transmission
1 mark each
3