State one advantage and one disadvantage for customers of using the Internet for shopping.
Advantages
Disadvantages
Describe two health risks associated with the increased use of computers.
Distinguish between real-time and distributed operating systems (KCSE 2018)
What are the functions of the system clock in the CPU?
What are the likely causes of data and program loss in a computer (2 marks)
State five functions of network operating system
State two benefits of using computerised traffic control systems
A computer operates as a binary digital device. Explain why binary is used to represent computer data.
What situations are likely to call for the use of Direct Changed Over?
Explain how a magnetic hard disk drive (HDD) operates
Describe the following features of a graphical user interface:
(a) Pointer
(b) Desktop
(a) Pointer
(b) Desktop
State advantages and disadvantages of the following system implementation strategies
Phased:
Advantages:
Disadvantages:
Pilot:
Advantages:
Disadvantages:
Direct:
Advantages:
Disadvantages:
Parallel:
Advantages:
Give a reason why HMTL is not regarded as a programming language
State three functions of a network operating system
Explain why a developer, who is good at both low-level and high-level programming, would normally use high-level languages when writing programs.
Mikal has been employed as a computer trainer in an organisation. State three roles that she is likely to play in the organisation
What precaution would you take in a computer lab if humidity falls below normal for prolonged periods due to weather changes?
Use a humidifier: Using a humidifier can help maintain a consistent level of humidity in the computer lab, which can prevent the negative effects of low humidity.
Avoid dry air: Avoid creating a dry environment in the computer lab by opening windows or using fans to increase air circulation.
Regular maintenance: Ensure that all computer components are properly maintained and cleaned to prevent damage due to static electricity.
Backup data: Regularly backup all important data to avoid data loss in case of hardware failure caused by low humidity.
Monitor humidity levels: Use a hygrometer to monitor the humidity levels in the computer lab and take corrective measures if the levels fall below a safe range.
Use anti-static materials: Use anti-static mats or wristbands when handling computer components to prevent static electricity buildup.
Explain the function of the protect sheet feature in the spreadsheet program
Briefly describe the following
Multitasking - the capability of an operating system to enable users to run two or more programs at once on a single computer
Real time processing - data processing system in which the time interval required to process and respond to inputs is so small that the response itself is useful for controlling the physical activity of a process
Time-sharing processing - a processing mode in which the central processor serves two or more users with different processing requirements (tasks)
On-line processing - is that type of processing where the result of data processing transaction is available immediately
State what is meant by each of the following modes of data processing
(i) Batch processing.
(ii) Real-time processing.
(iii) Online processing.
(iv) Off-line processing.
(i) Jobs collected together for processing at a later time
(ii) Output produced quickly enough to affect the next input
(iii) User has direct contact with the processor
(iv) User cannot communicate directly with the processor