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Introduction To Computer Applications Y1s1 Question Paper

Introduction To Computer Applications Y1s1

Course:Bachelor Of Commerce

Institution: Kabarak University question papers

Exam Year:2010

COURSE CODE: COMP 100/PCOMP011
COURSE TITLE: INTRODUCTION TO COMPUTER
APPLICATION
STREAM: Y1S1 & PRE - S1

INSTRUCTIONS:

Section A is compulsory
Attempt any TWO questions in section B

SECTION A: (COMPULSORY – 30 MARKS)

QUESTION 1.

A student stores all his/her assignments on a pen drive (USB Memory stick).

a) Give TWO reasons why pen drives have replaced floppy disks. (2 marks)

b) The teacher warned about computer viruses.
i) What is a computer virus? (1 marks)
ii) How are viruses spread from one computer to another? (2 marks)
iii) State THREE things that the student should do to reduce the risk of a
computer being infected by a computer virus. (3 marks)

c) Explain how the following types of computer differ:-
• Laptop. (1 marks)
• Mainframe. (1 marks)
• PC. (1 marks)
d) A student connects to the Internet using a telephone line.
i) What device is used to connect a computer to a telephone network?
(1 mark)
ii) What does this device do? (2 marks)

e) The following are the main types of validation checks:-
Presence, Field length, Format, Reasonableness, Character, Check Digits.
State which of the above checks are the most appropriate to identify the error in
EACH of the following circumstances:-

i) Gender entered as Y instead of M or F.
ii) Examination fee entered as £700 instead of £7.
iii) Surname omitted when setting up a new student record.
iv) Product code entered as ABC123 instead of 123ABC.
v) Works number entered as 12345 instead of 13245. (5 marks)

f) The Internet has changed the way people carry out many everyday activities. One
change is the use of Internet shopping.

i) State TWO advantages of shopping online for the customer. (2 marks)
ii) State TWO disadvantages of Internet shopping for the customer. (2 marks)
g) When sending credit card/debit card details to make a purchase, customers are usually
directed to a secure site. Explain what a secure site is. (2 marks)

h) Email is one tool for internet communication.
i) State TWO advantages of email compared to ordinary post. (2 marks)
ii) Give TWO disadvantages of email. (2 marks)

i) Data must be kept confidential for reasons of commercial confidentiality and because
of people’s natural right to privacy. In this context explain what is meant by
safe disposal of waste. (1 marks)

SECTION B: (ATTEMPT ANY TWO QUESTIONS. EACH QUESTION HAS
(20 MARKS)

QUESTION 2.

a) A firm stores records in a database. There are two tables in this database. One table
records details of all purchases. The other table stores customer personal information.

i) Why are codes used when entering data to a database? (2 marks)
ii) Customer-details records in the database are encrypted. What is encryption and
why are records encrypted? (4 marks)

b) Validation and verification are two different methods of controlling and detecting
errors. Describe how EACH of these is done.
i) Validation. (2 marks)
ii) Verification. (2 marks)

c) You have been asked to compare software. Describe TWO advantages and TWO
disadvantages of:
i) Off the shelf software (2 marks)
ii) Bespoke software (2 marks)
d) Suggest TWO software method of preventing access to the firm’s database by
unauthorised staff. (2 marks)

e) What is a backup? Why is it done regularly? Give two suitable storage devices used for
backup. (4 marks)

QUESTION 3.

The software supplied with a computer was an operation system and an integrated
package.
a) The integrated package has the following modules, word-processing,
spreadsheet, drawing, and database. Which of these modules would be used
for EACH of the following purposes:-

i) Writing letters to friends. (1 mark)
ii) Calculating the total cost of textbooks for a course. (1 mark)
iii) Keeping records about the customers of a business. (1 mark)
iv) Making a drawing of a design for a room. (1 mark)
v) Drawing a graph. (1 mark)

b) The modules of the integrated package will be compatible with each other.
Explain what “compatible” means in this context. (2 marks)

c) Explain five qualities of good information. (5 marks)

d) The operating system uses a Graphics User Interface (GUI). Explain what a GUI is and
why an inexperienced user might prefer a GUI to a command interface. (3 marks)

e) Give and explain five features of a good user-friendly software package.
(5 marks)
QUESTION 4.

a) Briefly describe any FOUR health and safety hazards that are related to working with
computer. For each state what an employer must do to minimize this risk.(8 marks)

b) i)The database required 600GB of disk space. Give the meaning of GB. (1 mark)
ii) How many 512MB Flash disks will be needed to backup this database?
(2 marks)
c) People using the free online packages are identified by their email address and also
need to enter a password.
i) Explain why a password is required. (2 marks)
ii) Give an example of how a group of students might find the online
collaboration facility useful. (2 marks)
d) Give the names of FIVE items of hardware that are needed in order to use an online
office package. (5 marks)

QUESTION 5.

a) What negative numbers do the following bits represent?
i) 11100101110.11012 (2C)
ii) 11000111.1012 (1C) (4 marks)
b) Define the following number systems:
i) Octal
ii) Hexadecimal (4 marks)

c) Perform the following conversions
i) 47326.10458 = X16
ii) 489623.742510 = X2
iii) 5105.62510 = X16 (6 marks)
d) Compute the following arithmetic
i) 4532.368 Multiplied by 231.248
ii) 10110111012 Multiplied by 11.012
iii) 45678 Divide by 238 (6 marks)

Introduction To Computer Applications Y1s1 Question Paper

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