Jane has noticed the following problems with her computer (2mks)
State three possible causes of these problems and how they can be solved (3mks)
There could be several possible causes for the issues Jane is experiencing with her computer keyboard, including:
1. Software Issues
- Cause: Outdated or corrupt system files, drivers, or operating system.
- Solution:
- Ensure the operating system and drivers are up-to-date.
- Run a system file checker to repair any corrupted system files (e.g., on Windows, run "sfc /scannow" from the Command Prompt).
- Consider reinstalling the operating system if issues persist.
2. Hardware Issues:
- Cause: Physical damage or malfunction in the keyboard hardware.
- Solution:
- Check for physical damage or debris under the keys and clean the keyboard if necessary.
- If cleaning doesn't help, consider replacing the keyboard with a new one.
3. Resource Overload:
- Cause: The computer may be running too many background processes or lacking sufficient hardware resources.
- Solution:
- Close unnecessary background applications and processes to free up system resources.
- Consider upgrading the computer's RAM, CPU, or storage if it's outdated and unable to handle current software demands.
- Use task manager or activity monitor to identify and terminate resource-intensive processes.
4. Malware or Viruses:
- Cause: Malicious software can slow down a computer, cause hanging, and delay startup.
- Solution:
- Perform a full system scan using reputable antivirus or anti-malware software to remove any threats.
- Ensure that the operating system's security patches are up-to-date.
5. Disk Fragmentation:
- Cause: Fragmented files can slow down the loading of applications and overall system performance.
- Solution:
- Run a disk defragmentation tool (e.g., Windows' built-in tool) to optimize file storage on the hard drive.
- Consider upgrading to a solid-state drive (SSD) for faster application loading times.
6. Insufficient Storage:
- Cause: If the hard drive is nearly full, it can cause slow performance.
- Solution:
- Free up space by deleting unnecessary files and programs.
- Consider upgrading to a larger capacity hard drive or SSD if storage space remains an issue.
7. Background Processes and Startup Items:
- Cause: Too many unnecessary programs running in the background or starting up with the computer.
- Solution:
- Disable or remove unnecessary startup items and background processes to improve startup time.
- Use the Task Manager or System Preferences (on macOS) to manage startup items.
It's important to diagnose the specific cause of the issues Jane is facing by troubleshooting each potential problem one by one. In some cases, a combination of these solutions may be necessary to fully resolve the problems with her computer keyboard.
State the reasons for system review and maintenance
Explain, using examples where appropriate, the meaning of these computer terms
(a) byte ..................................................................................................................................
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(b) compiler ............................................................................................................................
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(c) handshaking .....................................................................................................................
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(d) technical documentation ..................................................................................................
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(e) simulation .........................................................................................................................
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(a) byte
(b) compiler program
(c) handshaking
(d) technical documentation
(e) simulation
Differentiate between modulation and demodulation as used in data communication
Modulation refers to the process of converting a digital signal to analog signal at the transmission end while demodulation is to converting analog signal to digital signal at the receiving end
Explain a situation when each of the following Desktop Publishing programs features may be used when creating a document
(i) Crop - used when handling a graphic and there is a need to remove some of the portions in the graphic
(ii)Transparency - used when there is a need to make background of a graphic visible
With the aid of an example, explain the term multilevel list as used in word processing
1. Chapter 1
1.1. Introduction
1.1.1.Definition of terms
Confidential information about the students is to be stored on the computer system. Explain the measures that can be taken to ensure that such information remains confidential.
- Passwords
- Hierarchy
- Only allow some staff to access student files
- Only some machines able to access
- Physical location of these machines
- Physical lock on machines
- Encrypted data in files
- Firewall if connected to the Internet
Internet and E-mail Questions
Define the term internet 1mk
Explain the term web page 1mk
Explain the following internet address http://www.google.co.us in reference to the structure of a URL 3mks
What is the world wide web 1mk
Define the term browser 1mk
Explain the meaning of the word hyperlink 1mk
What is a search engine? 1mk
Explain the meaning of the term internet service provider 1mk
Identify three elements apart from a computer that is required for one to be connected to the internet 3mk
Define the term modem 1mk
What is a protocol? Write the following in full: TCP/IP, HTML, HTTP and FTP 5mks
What would you do if a website refused to load on the browser within the first attempt? 1mk
State three internet services 3mks
Define the term internet telephony 1mk
State three benefits of the internet in our society
State the functions of the following protocols
POP -Stands for post office protocol
SMTP- Simple Mail Transfer Protocol
FTP - Stands for the file transfer protocol
State the functions of the following protocols
POP -Stands for post office protocol
SMTP- Simple Mail Transfer Protocol
FTP - Stands for the file transfer protoc
Describe two health risks associated with the increased use of computers.
What is the difference between a logical file and a physical file?
For your item named in (a) describe two different tasks that the microprocessor performs.
Explain one drawback to a user if the program is distributed as freeware
The user is not allowed to access the source code so, they cannot tailor the software to their needs and they cannot fix any bugs in it
The software is still covered by copyright
The user must get the owner’s permission to do anything beyond using it
A company has a website that is stored on a web server.
(a) The website data is broken down into packets to be transmitted to a user.
Describe the structure of a data packet.
Describe how the database can be recovered from a system failure
Satellite services are used to provide broadband internet connectivity to regional and remote areas of Kenya. State one advantage and one disadvantage of using satellites for this purpose.
Advantages
Disadvantages
Describe the query criteria given below
(a) Like "*kenya*"
(b) Like "*ina"
(c) Like U*
(d) Not Like U*
(e) >= "Mexico"
(f) Like "[A-D]*"
(g) "USA" Or "UK"
Differentiate between active matrix and passive matrix LCDs
Give one difference between a compiled program and interpreted program
A virus is a specific category of malware. Describe three other different categories of malware.
Trojan (horse); a program which misleads the user into thinking it is another
piece of software which, when run, executes another program;
Spyware; a program which records data such as usernames and passwords on
a host system and forwards the information to a third party;
Adware; code embedded or attached to program files which will persistently
show adverts (that attempt to generate revenue);
Worm; code which will run autonomously and replicates itself on a host system;
Ransomware; a program that encrypts a user’s data to make it unreadable until
they pay for the key;
Remote Access Tool (RAT); allows access to control and monitor a computer
from a remote network location;
Rootkit; malware that has managed to gain ‘root’ admin privileges;
Bots/Zombies; a program installed on a computer that performs a job for the
remote owner of the bot/zombie such as sending spam or sending web requests
to perform a DOS or attack a computer system;
Scareware; malware that tells you something is wrong with your system in an
attempt to get you to make a purchase;
Keylogger; a program that monitors/records a user’s keystrokes in order to steal
passwords/confidential details