Perform the following binary arithmetic and give your answers in decimal notation:
(i)1010.101 + 11.011
(ii)1010.011 – 11.011 (b) Covert the following numbers into their binary equivalents (i)0.562510 (ii)0.312510 (c) Using four – bit twos compliment, perform the following arithmetic 1012- 1112 
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Study the following diagram and answer the questions that follow
From the diagram:
(i) Name two devices that are used for long term storage (ii) Name three peripherals shown on the diagram that are used for input (iii) Name two other devices that a computer Aided Design (CAD) user might wish to add to the set- up above (b)A customer wishes to purchase a computer system. The customer can buy a word processor, spreadsheet, database and a drawing package separately or as an integrated package. State three advantages why many computer users prefer integrated packages to separate packages. (c) (i) An anti- virus software installed in a computer is loaded into the main memory each time the computer is switched on Explain three ways in which computer virus are spread from one computer to another (ii) Give two reasons why an anti virus package should be updated regularly
RESPONSES
(a) (i)ROM
Hard disk 2GB HDD (ii)
To enable remove upcoming viruses/new viruses For maintenance purposes (patches) To upgrade/replace outdated antiviruses. The diagram below shows a layout of a computer network used by a law farm. A workstation and a printer are located in every consulting room
(i) Name the network topology depicted in the diagram
(ii) Name the device labeled D (iii) State four functions of the device labeled ‘server’ (iv) Give two advantages and one disadvantage of the above network design (v) If the firm intends to open extra offices in two different towns, name any three hardware devices that would be required (vi) State any two security problems that might arise by linking the offices in different towns (b) What is spyware?
RESPONSES
(a) (i)Star
(ii) Hub or Switch/Router (iii)File sharing
Advantages .
A lecturer keeps the following student details in a database: name, age, course
(a) write an expression you would use to compute the year of birth of a student using this year as the current year
(b) what query expressions would the lecturer use to list the students whose age is above 15 years and below 25 years? (c) Which expression would the lecturer use to generate? (i) The number of students in the database? (ii) The mean age of the students in the database? (d)Name and describe any two types of database models
RESPONSES
Study the flowchart below and answer the questions that follow
(a) What would the flowchart generate as output if the value of N at input was:
(i) 6? (ii)1? (b) Write a pseudocode that does the same thing as the flowchart above (c) Modify the flowchart so as to reject an input below and to avoid the looping when the input is 0
RESPONSES
Arrange the following job titles in the order of their seniority;Database administrator, ICT manager, systems analyst
Either
Give three ways in which horticultural farmers can benefit from the use of information and communication Technology (ICT)
ICT serves as a:
Name the two files commonly used in mail merge
(b) Name and explain the two types of drop caps
Name two types of buses found on the computer motherboard
(b) State the purpose of each of the types of buses named in (a) above
What is an internet Protocol (IP) address?
(ii) Why is an IP address necessary?
(b) What is the purpose of the following internet domains?
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A computer accessories vendor needs to order supplies. A spreadsheet is used to calculate the order part of which is shown below.
(a)Write the formula that can be used in:
(i)D2
(ii)D5
(b)If a value added tax (VAT) of 16% was charged on each item and the number ordered was decreased by 10%, write a new formula that can be used in D2
With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer
31/12/2020
With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer
Give a reason for each of the following
(a)Changing a password regularly
- To ensure that no one else / unauthorized person has access to the password/system
(b)Typing and re- typing a new password when changing it
- To ensure certainty of the chosen password
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