Differentiate between one’s complement and two’s complement in data representation.
(a) (i) Differentiate between one’s complement and two’s complement in data representation.
(ii) Explain the preference of binary number systems over decimal number systems in computers. (b) (i) Using one’s complement, subtract 1000112 from 0100102 (ii) Convert the number 21.0312510 to its binary equivalent. (c)Perform the following binary operations. 1101 + 11011 + 101 + 11111
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 A worker is unable to travel to the office but may still be able to do the office work through telecommuting.
(a) Explain why the worker may use each of the following:
(i) email; (ii) fax; (iii) digital camera; (iv) firewall. (b) The worker needs to make regular backups of documents sent to the office. State three reasons for this. (c) Explain two benefits that the employer will get by allowing this worker to do the office work through telecommuting.
RESPONSES
(a) E-mail: - used to send and receive electronic documents to/from the office.
Receive instructions from the supervisor or co-workers. Fax: - Used to send documents which are in non-electronic format Digital camera - Used to capture images in picture form/video conferencing. Firewall - Used to prevent intrusion to the home computer because telecommuting involves connection to the internet. (b) Communication systems may fail/communication channel may fail.
Figure 4 shows an advert placed in a newspaper. Use it to answer the questions that follow.6/1/2021 Figure 4 shows an advert placed in a newspaper. Use it to answer the questions that follow.
(a)(i) Define a laptop computer.
(ii) The screen is said to be 17 inches. Explain what this means. (b)State one advantage of having each of the following provided with a laptop. (i) modem (ii) USB (iii) free suite (c) State the software package in the free suite which is most suitable for each of the following: (i) computing budgets . (ii) creating documents (iii) designing of brochures (iv) records management (d) (i) State three advantages of using a computer to design an advert such as the one in Figure 4. (ii) State two benefits of having the advert uploaded on the internet.
RESPONSES
(a)Definition of a laptop computer
(a) (i) Is a portable computer small enough to be used on laps.(evidence of portability, mobility, small size) 17” screen (ii) Diagonal length of the screen. An indication of the size of the screen. (b)Advantages of the following: (i) modem
(c)Package suitability
Describe three types of validation checks as used in data processing.
(b) A company has opted to store its employees’ personal details in a computer system.
Describe two software methods that may be used to prevent unauthorized access to these details. (c) (i) Describe each of the following data processing modes: I. real-time; II. interactive. (ii) State an application area where real-time data processing mode is applied.
RESPONSES
(a) Validation checks
Figure 3 shows a flowchart. Use it to answer the questions that follow.
(i) Determine the output from the flowchart if:
I. X=5; II. X=7. (ii) Write a Pseudocode for the flowchart in figure 3. (iii) Modify the flowchart so that it can be used to get the sum of integers between 50 and 100. (b) List two programming language translators.
RESPONSES
Identify the appropriate output device for the production of each of the following:(a) receipts where carbon copies are required;
(b) an architectural drawing where precision is required;
(c) output where the user is visually impaired.
Describe compatibility as a factor to consider when purchasing a computer.
A computer is idle but the hard disk light is blinking, indicating some activity. State two possible causes of this.
Explain why a DTP application would be preferred to a word processing application when designing a publication.
The 21st century has had many forms of ICT technologies improving the various means of communication. However, these changes have brought many challenges.State three negative social impacts of these technologies.
Explain the importance of disk partitioning.
Importance of disk partitioning.
Differentiate between pull-down menu and pop-up menu as used in Graphical User Interface (GUI) operating systems.
Difference between pull-down and pop-up menus
An organisation intends to replace an existing system by carrying out the process in stages.6/1/2021 An organisation intends to replace an existing system by carrying out the process in stages.(a) Name this implementation strategy.
The implementation strategy is:
(b) Give two reasons why the organisation is opting to use the implementation strategy in (a) above.
Reasons for partial approach.
The topology below is formed by combining two types of topologies.
(a) Give one name for the combined topology in figure 2.
(b) Name the two topologies forming the combined topology in figure 2.
State three reasons why an organisation may opt to develop its own software in-house rather than buy off-the-shelf software.
A retailer uses a spreadsheet program to calculate profits. Figure 1 shows the spreadsheet.6/1/2021 A retailer uses a spreadsheet program to calculate profits. Figure 1 shows the spreadsheet.
(a) Which row contains labels only?
(b) Write the formula that has been entered in cell F2.
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