O level north west regional mock gce 2022 computer science 2
O level north west regional mock gce 2022 computer science 2
1 • (a) Briefly explain the following:
i) Ergonomics
ii) Repetitive Strain injury
iii) Computer Vision Syndrome
iv) Green Computing
v) Encryption
(b) Consider the Boolean equation: P=AB +A .B
i) Deduce the digital circuit from the Boolean equation above
ii) Copy and Complete the corresponding truth table below
2. (a) Distinguish between the following;
i) Parallel and serial transmission
ii) Synchronous and asynchronous transmission
iii) Half duplex and Full duplex transmission
b) You are requested by the Principal of your school to make recommendations for the types and specifications of
computers for the school laboratory. Name three characteristics of the system unit you will recommend and for
each
, say how each of the characteristics is important to the proper functioning of the computers.
c) State and briefly explain activities that take place within the four stages involved in the machine instruction cycle.
3. a) i) Establish the octal equivalent for 1101111 1012.’ (3 Marks)
ii) In the ASCII coding system, the decimal representation of the number 63 is 00111111. Deduce the ASCII
representation of the decimal number 66.
iii) Evaluate 1100112- HOI 2 + 100112
b) In a software development project a team identify various activity to be carried out as indicated in the table
