A firm intends to purchase new software. List three items that should accompany the software26/12/2020 (a) A firm intends to purchase new software. List three items that should accompany the software (3mks)
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(a) What are computer viruses?
A computer program designed specifically to damage other programs or cause irregular behaviour.
(b)
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Primary Memory |
Secondary Memory |
|
1. Capacity |
Low storage capacity |
High storage capacity |
2. Storage mechanism |
Volatile (loses content when power is switched off) |
Non-Volatile (does not lose content when power is switched off) |
3. Speed of storage/access/retrieval of information |
Fast |
Slow |
4. Storage terms |
Store data temporary unless it is a special type of ROM |
Store data permanently |
5. Examples |
RAM and ROM |
Optical Disks such as DVDs, Magnetic Disks such as HardDisk, Solid state disks such as Flash disk and Memory stick |
6. Uses |
Handles data currently needed by the computer |
Stores data that is needed for future reference or data being transfered from one machine to another. |
State two methods of minimizing dust in a computer laboratory
- Regular cleaning and mopping
- Computer laboratory should be built while doors facing away from wind direction.
- Ensure proper ventilation in the computer laboratory
- Dry cleaning methods should be observed.
- Air blowing
- Use a carpeted/tiled floor (gathers dust slowly and does not raise dust)
- Users to remove muddy shoes or clean them to ensures that no dust is carried to the room.
Steps in program development cycle in their logical sequence
Name six steps in program development cycle in their logical sequence. (3mks)
- Problem definition
- Feasibility study/ Requirement Analysis
- System design
- Programming / Program coding
- Testing and debugging
- System implementation
- Operation and maintenance
Advantages of computer networking
Reasons why computer networks are important:
- Networking enables computers to share resources like hard disks, memory, CD drives, files, printers, among others.
- Networks enable more efficient, cost effective, flexible and customized remote communication instantly over long distances.
- Computer networks enable distributed processing ability, that is, combining of their processing power to share tasks.
- Networks reduce the cost of hardware and software purchase because these resources can be shared in a network instead of buying individual copies for each computer.
- Networks provide more reliability. If one computer fails, another one in the network can be used to access files and other resources held in centralized servers.
- Stored risk and mutual support.
Suggest how computers may in future be made more users friendly for persons that are:
Blind
Voice - to - Text
Computers that respond to touch and sound (voice)/Braille keyboard
Define the term array as used in computer programming (2mks)
An array is a structure, which holds many variables, all of the same data type.
The array consists of so may element, each element of the array capable of storing one piece of data (variable)
The array consists of so may element, each element of the array capable of storing one piece of data (variable)
An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.
What are the applications of array?
- Used in mathematical problems like matrices etc.
- They are used in the implementation of other data structures like linked lists etc.
- Database records are usually implemented as arrays.
- Used in lookup tables by computer.
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