(a) What is an operating system?

(b) Give three examples of operating system.

(c) State two differences between the floppy disk and compact disc.

(d) Write a Basic program to calculate the perimeter of a rectangle.

(a) Draw the AND gate and produce its truth table

(b) List two examples of an output device.

(c)(i) What is a computer virus.

(ii) Give two examples of computer virus.

(d) Convent 28C in hexadecimal to decimal number

(a) List two operations that can be performed on computer file.

(b) State three precautions to be taken in order to secure a computer file.

(c) State three advantages of computerized file over manual files.

(d)What is an antivirus?

Briefly explain the following terms: (a) website (b) protocols (c) webpage (d) e-commerce (e) e-mails.

(a) What is word processing?

(b) Give two example of word processors.

(c) State two uses of world wide web (www)

(d)(i) List two types of cables. (ii) What is the advantage of registered jacks 11 (RJ11) over other connectors?