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Comp 121: Introduction To Computer Applications August 2009 Question Paper

Comp 121: Introduction To Computer Applications August 2009

Course:Bachelor Of Education Science

Institution: Kabarak University question papers

Exam Year:2009

INSTRUCTIONS:
Section A is compulsory and has 30 marks. Attempt any TWO questions from Section
B. Each question has 20 marks.
SECTION A
QUESTION 1 (30 MARKS)
a) Differentiate between the following terms:
(i) System software and Application software
(ii) RAM and ROM
(iii) Hardcopy and Softcopy
(iv) Hardware and Software
(v) WIMP and WYSIWYG (10 marks)
b) What is a firmware? (2 marks)
c) What is a web browser? Give two examples (3 marks)
d) What is SPAM? (1 mark)
e) What is VOIP and what is its main advantage? (2 marks)
f) Differentiate between multiprogramming and multiprocessing (2 marks)
g) Each window on the data entry screen has a scroll bar. What is a scroll bar used for?
(1 mark)
h) Both the floppy disk and the CD-RW may soon disappear. Briefly explain why this is
likely to happen. (1 mark)
i) What is an internet service provider? (ISP) (2 marks)
j) Briefly explain what backup means. Give two external storage devices that can be used
for backup. (2 marks)
k) What is the difference between a range check and a limit check? (2 marks)
l) What is a search engine? Give one example. (2 marks)
SECTION B
QUESTION 2 (20 MARKS)
a) You have been asked to compare software. Describe ONE advantage and ONE
disadvantage of:
i) Off the shelf software (2 marks)
ii) Bespoke software (2 marks)Page 3 of 4
b) i) Compute ADF16 – 4C516 in hexadecimal (2 marks)
ii) Perform the following arithmetics:
· 1110112 divide by 1012 (2 marks)
· 351.48 multiply by 42.38 (2 marks)
· 5.12510 decimal to hexadecimal (2 mark)
c) What negative number do these bits (1110001011100) represent in two’s compliment?
(2 marks)
d) i) Briefly describe the first four computer generation programming languages.
(4 marks)
ii) Differentiate between an interpreter and a compiler. (2 marks)
QUESTION 3 (20 MARKS)
a) Briefly describe any five health and safety hazards that are related to working
with computer. For each state what an employer must do to minimize this risk.
(5 marks)
b) With examples, explain the meaning of the following terms:
i) Simplex
ii) Duplex
iii) Half duplex (6 marks)
c) Give four differences between a LAN and WAN. (4 marks)
d) Give and explain five features of a good user-friendly software package.
(5 marks)
QUESTION 4 (20 MARKS)
a) Data may be corrupted by hackers, viruses or machine malfunction.
i) List two software methods of preventing unauthorized access to data.
(2 marks)
ii) Give two physical methods of preventing unauthorized access to data.
(2 mark)
iii) Briefly explain what is meant by a computer virus. (2 mark)
iv) Give four precautions that should be taken to avoid corruption of data by
viruses. (4 marks)
v) What should be done to avoid losing data when a machine malfunctions
(2 mark)
b) Data must be kept confidential for reasons of commercial confidentiality and
because of people’s natural right to privacy
i) In this context explain what is meant by safe disposal of waste. (2 marks)
ii) Explain what encryption is and how this technique can help keep data private.
(2 marks)
iii) Explain four functions of an operating system. (4 marks)Page 4 of 4
QUESTION 5 (20 MARKS)
a) What do you understand by the term electronic commerce? (2 marks)
b) Differentiate between Intranet and Extranet (2 marks)
c) An integrated package such as Microsoft Office contains several packages such as a
word processor, a spreadsheet and a database. Describe the purpose and different
facilities offered by the following packages:
i) Word Processor (2 marks)
ii) Spreadsheet (2 marks)
iii) Database (2 marks)
iv) PowerPoint (2 marks)
d) Clearly describe two disadvantages, other than cost, of an integrated package such
as that described in part c) of this question. (2 mark)
e) Give SIX benefits of internet. (6 marks)

Comp 121: Introduction To Computer Applications August 2009 Question Paper

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