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SECTION A (40 marks)
Answer all questions in this section in the spaces provided.
1.(a) Headache, back and neck pain may result from use of computers. Explain two ways in which back and neck pain can be minimized. (2mks)
(b) State how computer have been made more users friendly for persons that are:
16. a) State two qualities of a good pseudocode. (2 marks)
b) With the aid of flowchart diagrams, describe each of the following programme control structures:
17. A) (i) What is a Blog in relation to internet services (2marks)
It is an internet site where a person can regularly post personal information, music, movies and diaries and socially interact with people connected to the same.
(ii) Explain the impact of the internet in the information security (2 marks)
Private and confidential information is constantly at risk from hackers, crackers and fraudsters who carryout their trade on the internet.
(b) Kunta would like to send photos to Kinte via e-mail. Outline the steps Kunta would follow to send the photos as file attachments (3marks)
Any other appropriate procedure is allowed. One mark based any of the bolded keywords in logical order.
(c) Differentiate between the following in relation to data security and control (4 marks)
18. ( a) (i) State two reasons for data representation in a computer (2 Marks)
(ii) Define the following words as used in data representation in a computer (4 Marks)
(iii) (a) Convert 3410 to its binary equivalent. (2 Marks)
(b) Convert 10010112 into decimal number system equivalent (2 marks)
iv. (a) Briefly explain how data is represented in a computer (3 marks)
3 marks for any relevant explanation
(ii) With the aid of a well labelled diagram, distinguish between analogue and digital signals (2 marks)
19) (i) With the aid of a diagram, describe seven stages in system development life cycle (SDLC) in their logical sequence (7 marks)
(ii) (a) What is a closed system?(1mark)
This is a system that receives input but does not necessarily give the output.
The borders of a closed system are not clearly defined
(iii) State four roles played by an information system. (4 marks)
20) (a) (i) State any four factors you would consider before installing an operating system. (4 marks)
(ii) (1) State two reasons that causes computers to hang (2 marks)
(2) State solutions to the causes you listed 19. (ii) (1) above (2 marks)
(c) In relation to operating system, differentiate between Kernel and Shell. (2 marks)
A kernel is the central part of an operating system. It manages the operations of the computer and the hardware, most notably memory and CPU time.
A shell is a computer program which exposes an operating system's services to a human user or other program.
(d) State any two characteristics of a computer file. (2 marks)
(e) Mobile Operating System (OS) is software that allows Smart phones, Tablet PCs and other devices to run applications and programs. List any THREE examples of Mobile Operating Systems (3 marks)
Applications Areas Of Ict
Career Opportunities In Ict
Classification Of Computers
Data Representation In A Computer
Data Security And Controls
Definition And Development Of Algorithm
Elementary Programming Principles
Form 3 Mock Exams
Hands On Skills
Impact Of Ict On Society
Internet And Email
Introduction To Networking And Data Communication
Intro To Computers
Stages Of System Development
The Computer Laboratory