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CXC IT THEORY JUN 2004
SECTION I AND II
ANSWER ALL QUESTIONS
SECTION I
1. (a) Name the hardware component of a computer that performs
EACH
of the following functions:
(i) Directs internal operations within the CPU
(ii) Stores programs and data that are currently being used by
the CPU
(iii) Stores instructions that are used during the boot-up
process.
(3 marks)
(b) State TWO factors that affect the quality of the display on
the monitor. (2 marks)
Total 5 marks
2. (a) Choose ONE appropriate method of data entry for EACH of
the following
situations or applications:
(i) Production of CD-ROM based text from existing books
(ii) Marking multiple choice examination scripts
(iii) Entering sound into the computer (3 marks)
(b) Briefly describe how the following types of printers
generate hardcopy
output:
(i) Dot-matrix
(ii) Thermal
(iii) Ink-jet (3 marks)
Total 6 marks
3. List TWO advantages and TWO disadvantages of an integrated
software package
over a collection of separate applications packages running
under a common
operating environment. (4 marks)
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4. (a) State the binary and BCD representation for 187. (4
marks)
(b) Using eight-bit, twos complement binary numbers, compute
11-7.
(2 marks)
Total 4 marks
5. (a) What is the difference between a command-line interface
and a graphical- user interface?
(2 marks)
(b) State TWO advantages of installing more than one operating
systems on a stand-alone
microcomputer. (2 marks)
Total 4 marks
6. (a) List TWO advantages and TWO disadvantages of using a
network in place of stand-alone
computers. (4 marks)
(b) You have one diskette that you use to store files related to
the work you do for school.
Your club and home. Describe an efficient way to organize the
various files on your
diskette. (2 marks)
(c) You boot up your computer but nothing is displayed on the
monitor. List TWO things
you would do to troubleshoot the problem. (1 mark)
Total 7 marks
SECTION II
7. (a) A small company is interested in setting up and Internet
caf to allow users to make
cheap voice to voice, overseas, telephone calls over the
internet. Apart from computers
and Internet access:
(i) What peripheral device must be attached to EACH
computer?
(ii) What component must be present in the system unit of each
computer?
(iii) What financial transaction MUST the Internet caf make
before calls can be
provided to its customers? ( 3 marks)
(b) (i) What is a search engine?
(ii) Why is search engine useful when surfing the net? (2
marks)
Total 5 marks
8. (a) As part of a project to modernize the police force in a
country, computers
and related equipment have been installed in the Intelligence
Unit of the
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police force and all staff in the unit have been trained to use
computers.
State THREE uses of the computers in the Intelligence Unit.
(3 marks)
(b) State THREE different computer-related crimes and identify
TWO measures that shouldbe put in place to prevent them. (5
marks)
Total 8 marks
9. (a) (i) What is meant by the terms CAD and CAM?
(ii) Why are CAD and CAM usually integrated? (4 marks)
(b) Outline THREE typical functions which a network manager
would have
to undertake in order to maintain a LAN-based system. (3
marks)
Total 7 marks
10. (a) For information to be useful, it must be organized. List
TWO other
qualities that the information must have to make it useful. (2
marks)
(b) List THREE measures you would take to ensure that your
computer
system is protected from viruses. (3 marks)
(c) Briefly explain the differences between backing up and
archiving
data. (2 marks)
(d) The election office has a large amount of vital and
sensitive information.
Describe THREE steps that should be taken to protect the data
againstdeliberate theft or corruption.
(3 marks)
Total 10 marks
PROGRAMMING
ANSWER ALL QUESTIONS.
11. Write pseudocode to calculate the cost of importing a car.
First a tax of 2% of the original cost of
the car is added to the cost of the car to give a landing cost.
Then, if the car is 5 years or less a
transportation tax of 15% of the original cost of the car is
charged. If the car is older than 5 years,
the transportation tax is 20%. The final cost of importing the
car is calculated by adding thetransportation tax to the landing
cost.
Total 4 marks
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12. (a) Write a structured algorithm to perform the
following:
- Prompt the user to input two numbers and a character. A choice
of a character
A for Add, or S for subtract is to be used.
- According to the character input, printout the sum, or
difference of the two
numbers. (9 marks)
(b) Modify the algorithm so that it keeps repeating until zero
is entered for both numbers.
And a space for the character. Do not re-write code.
(5 marks)
Total 14 marks
13. (a) What levels of programming languages are represented
below:
(i) R1: 110011
(ii) R2: SELECT NAME FROM LIST
(iii) R3: MUL 6, 2 (5 marks)
(b) Give ONE advantage of using each of the following:
(i) an interpreter
(ii) a complier. (4 marks)
Total 7 marks
14. Consider the following pattern:
Example: A+B is equivalent to +AB
The pattern places the operator (+ in the example above) BEFORE
it operands (the A and B).
Correct the following equations if necessary:
(i) X/Y = / X / Y (1 mark)
(ii) A (B*C) = - A * BC (2 marks)
(iii) (A*A*A) = A*AA (2 marks)
Total 5 marks
