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Q&A-KCSE Computer Studies Paper 1

Computer programs require translation to execute. (a) Compilers and interpreters translate high-level programming languages into machine code. Describe the main differences between a compiler and an interpreter.

  • A compiler translates the whole program in one go whereas An interpreter translates each line of code (often an intermediate code) at run time
  • A compiler produces an executable file that will run on the target hardware machine without the compiler being installed  A run time interpreter will be required at run time
  • Compilers tend to be large complex programs Interpreters are smaller simpler programs
  • Interpreted programs can be amended and run without translating whole program Compiled programs have to be re-compiled after a change
  • Compilers compile programs that will usually only run on the target platform (hardware/operating system)  Interpreters will interpret same program (or intermediate code) on different (some virtual) platforms
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Explain one benefit to a user if the program is distributed as free software

  • The user can access the source code  so, they can tailor the software to their needs and they can fix any bugs in it
  • the source code could be studied for educational purposes
  • The user can redistribute the software/program  but this must be done under the same terms as the original software
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Maranda Mock CRE Paper 2 2024 

c) Six ways in which Christians can assist the physically challenged members of the society (6mks)

Establishing special institutions for them

Donating equipment, which assists them in their movement.

Giving them vocational training

Assisting them in their daily chores

Accepting them as human beings like themselves

Helping them to develop their talents e.g. games, music, drama etc.

Identifying their abilities and giving them employment.

Encouraging relatives to live with them.

Giving them financial assistance to start income generating projects 


 

a) The parable of the shrewd manager in Luke 16:1-33. (7mks)

There was a rich man who had a steward. He received charges that the steward was wasting his goods.

He called him what he was hearing about him. He told him to turn in account of his stewardship for he could no longer be steward.

The steward asked himself what he would do since his master was taking the stewardship away from him.

He was not strong enough to dig and was ashamed to beg.

He decided what to do so that people may receive him into their house when he is out of the stewardship

He was to summon his masters’ debtors one by one. He went to the first one and asked him how much he owned his master. The debtor said a hundred measures of oil, which he was told to write fifty.

He asked another how much he owned his master. He said a hundred measures of wheat he was told to write eighty

The master commended the dishonest steward for his shrewdness for the sons of his world are shrewder in dealing with their own generation that the ones light.


 

Seven causes of conflict between Jesus and the Jewish leader in Jerusalem. (7mks)

They questioned the authority Jesus was using to teach Lk 20:1-8.

Jesus accused them of persecuting and rejecting Gods servants in the parable of tenants. Lk 20:9-18.

They had conflict on the issue of whether to pay taxes to cease or not. Lk 20:19-26

The question on resurrection by the Sadducees on Levites marriage. Lk 20:27-39

He claimed to be the messiah and said that even David called Him Lord in the book of Psalms Lk 20:4-44

Jesus openly condemned the hypocrisy of the Jewish leader Lk 20:45-47

Jesus prophesied the destruction of temple of Jerusalem

He condemned the offerings of the rich Jewish leaders, which were meant to show off, but praised the widows’ offerings, which was made out of self-sacrifice Lk 21:1.


 

Six ways in which parents can resolve misunderstanding with their children. (6mks)

Allowing dialogue

Listening to their views

Presenting them with the correct, picture of the situation

Setting a good example to them

Giving them appropriate time for leisure activities

Seeking help from church leaders

Guiding them on how to choose friends

Advising them on the right moral values

Praying for and with them to bring about understanding 

Committing the children to God’s will

Discussing the problem with their friends and relatives


 

a) Seven reasons why Jesus sent the Holy Spirit to the disciples after his ascension. (7mks)

The holy spirit would comfort the disciples

He was to counsel the disciples

He would guide the disciples on what is right / God’s righteousness

He was to convict people of their sins

He was to show disciples on what is right

He was to reveal the future / enable the disciples to prophet’s / God’s will

He would glorify Jesus through the work of the disciples

He would enable the disciples to witness Christ throughout the world

He would replace the physical presence of Jesus 

He would empower the disciples to be able to speak with courage

b)How the unity of believers is expressed in the body of Christ? (8mks)

St Paul describes the believers as the body of Christ 

Christ is the head of the church

The believers form parts of the body

The body has different organs, in the same way the church has different members

They all need to work together for the well-being of the church 

Every part of the body is needed to make it whole/ all parts interdependent / one part cannot be without the other

The different church members are given different spiritual gifts by the holy spirit to carry out God’s work 

Believers are united through baptism in the Holy Spirit.


 

c)The church in Kenya help to bring about the unity in the country. (6mks)

Assisting the government is developing a curriculum schools that teaches about patriotism

Advocating for peaceful co-existence among Kenyans

Fighting corruption, discrimination, tribalism, nepotism and all forms of favourism

Acting as a voice of reason among the ruling political class demanding their unity as a government

Assisting the less fortunate in the society thus fighting disparity

Condemning and reporting to the relevant authorized groups that bring disharmony in the society

Developing joint rallies, prayers and reconciliatory meetings together.

Forgiving one another to avoid disunity

Obeying church rules/ leaders

Chastity is a virtue


 

a) Attitude of Christian towards human sexuality. (7mks)

Sex is sacred

Man and woman are for companionship

Both man and woman are equal before God

It is for procreation

Man and woman are complementary 

Man and woman were created in the image of God

They became one in marriage

Human beings have the ability to control sexual desire

All forms of irresponsible sex are condemned 

Chastity is a virtue

b)Six ways in which sex is abused in Kenya today. (6mks)

Sex before marriage / fornication/ pre-marital sex

Sex outside marriage / adultery

Prostitution

Bestiality

Homosexuality/ lesbianism/ sodomy/oral sex

Pornographic literature/mass media using of technological devices in sex

Incest

Masturbation

Rape /defilement of minors

c)Why are minors sexually abused in Kenya today? (7mks)

Permissiveness

Lack of self-control

Influence of the mass media

Mental illness / stress/ drug and substance influence

Erosion of the African culture moral value

False religious / devil worship /strange cults

To avenge for oneself

Breakdown of religious values

Irresponsible parenthood

Indecent dressing

Leniency of the law

Idleness

Poverty / unemployment

6 a) Six practices in the African Society that promoted law, order and justice? (6mks)

Cultural taboos/dos and don’ts in the society

Kinship ties had rules which governed their relationships

Oaths – swearing while making agreements.

Rites of passage e.g. during initiation, the youth were taught laws/secrets of society.

Practice of rituals in the society promoted good relationships between the living/living dead.

Communal life i.e. “I am because we are, and since we are therefore Iamb.”

Inheritance of property was done fairly which brought justice /order.

Worship of God/veneration of ancestors created orderliness

b). Seven reasons for the need of law, order and justice in the society. (7mks)

In order to safeguard peoples personal rights.

To ensure security and protection of the people and their property.

To promote peace and harmony

To attract both local and foreign investment in the country

To promote peaceful relationship between countries.

To safeguard freedom of the citizens

To control and check the powers of those in authority

To enable the gov’t to implement its taxation policies effectively and to use the money

collected for the good of the community

To enable Christians worship God in peace and freely spread the good news.


 

c) Explain the factors which hinder effective maintenance of law and order in the (7 marks)

Increase in the rate of crime especially in urban areas

Political instability e.g. Post election violence

Greed for power and wealth

Political selfishness leading to dictatorship and despotism

High rate of unemployment leading to idleness / crime

Corruption especially by custodians of the law e.g. police.

Hypocrisy i.e. leaders misleading the society

High level of poverty forcing others into crime



 

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Describe how the CPU and main memory work together.

Data and instructions are fetched from main memory, from addresses requested by the CPU on the address bus. (Data and instructions are sent) using the data bus. (Data and instructions are then) decoded and executed in the CPU.
Results of operations are sent back to the memory on the data bus

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What is audit trail?

A record showing who has accessed a computer system and what operations he or she has performed during a given period of time

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Using an example, explain a difference between a primary key and a foreign key in a relational database.

A primary key is a table field that uniquely identifies each record and ensures that duplicate entries are not allowed

A foreign key is primary key of a parent table placed in a child table to ensure that any record added to a child table is related to the one in parent table.


A foreign key is a field (or a set of fields) in one table that refers to the primary key of another table. It is used to establish and enforce a link between the data in the two tables, ensuring referential integrity.

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Explain the difference between how the IMAP (Internet message access protocol) and SMTP (simple mail transfer protocol) protocols are used

IMAP

  • Retrieves/accesses/downloads (a copy of an) e-mail
  • Allows synchronisation/management of account

SMTP:

  • Sends/forwards/transmits e-mai
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What is a source code as used in computer programming?

  • It is a program written in a high level langauage
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Describe the principles of operation of  laser printers and describe how they are applied in real-life scenarios

  • A laser printer makes use of powdered ink and static electricity to print
  • Unlike inkjet printers which print line-by-line, laser printers print the whole page in one go

Steps

  • The data from the  file to be printed is sent to a printer driver
  • The printer driver checks that the data is in an understandable format
  • The printer driver checks if the printer is able to carry out the print job
  • The data is sent to the printer and is stored in a printer buffer
  • A printing drum in the printer is given a positve charge. A laser beam removes the positive charge in some areas. This leaves negatively charged areas which matches the characters/images to be printed
  •  
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Explain the term proofreading as used in word processing (2mks) [kcse 2017 Paper 1]

  • It is the use of proofing tools like spelling and grammar checkers and autocorrects to check whether a document has typographical or grammatical errors
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Compare the use of a compiler with the use of an interpreter to translate code

Both translate source code written in high level programming languages into machine code.
Compiler: Produces a single executable file that is portable between machines
Interpreter: Source code needs a special environment to run
Compiler: Needs to be compiled for a particular architecture
Interpreter: Can run on any architecture that has the translator/interpreter
Complier: Entire source code file is translated at once
Interpreter: Code is translated line by line
Compiler: Provides error report at the end of the compilation
Interpreter: Errors more obvious in the sequence
Compiler: The program source code is not available (so helps protect IP)
Interpreter: Source code is available
Compiler: Only has to be translated once (affecting the speed of execution)
Interpreter: Has to be translated each time, therefore (affecting the speed of execution)
Compiler: Requires two files to be maintained (one for execution and for editing purposes)
Interpreter: Requires only one file to be maintained
 

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Give two uses of spreadsheets in a government office concerned with carrying out national census
Tallying population size Establishing demographic trends Drawing pie charts to show population share by gender Doing census budgets

What precautions would you take in a computer room in case a user complains of backache after long periods of using the computer?

  1. Ergonomic Chair: Ensure that each user has an ergonomic chair that provides proper lumbar support. The chair should be adjustable in terms of height and backrest angle.

  2. Adjustable Desk: Provide adjustable desks or workstations that can accommodate different user heights and allow for proper positioning of the keyboard, mouse, and monitor.

  3. Monitor Placement: Ensure that the computer monitors are positioned at eye level or slightly below to prevent users from straining their necks and shoulders. Consider using monitor stands or adjustable monitor arms for better positioning.

  4. Keyboard and Mouse: Encourage the use of ergonomic keyboards and mice that are designed to minimize strain on the wrists and hands. Provide wrist rests if needed.

  5. Proper Lighting: Ensure that the computer room is well-lit, with appropriate lighting levels to reduce eye strain. Avoid glare on the computer screens by using adjustable blinds or curtains.

  6. Regular Breaks: Encourage users to take regular breaks from prolonged computer use. Suggest the 20-20-20 rule: Every 20 minutes, look away from the screen at an object 20 feet away for at least 20 seconds.

  7. Stretching Exercises: Promote stretching exercises for the neck, shoulders, and back to help alleviate muscle tension and improve blood circulation. Display posters or provide resources on desk stretches and exercises.

  8. Correct Posture: Educate users about proper sitting posture, emphasizing the importance of maintaining a neutral spine position. Provide visual aids or ergonomic training materials to demonstrate the correct posture.

  9. Desk Organization: Encourage users to keep their workstations organized to minimize the need for reaching or straining. This includes keeping frequently used items within easy reach and arranging cables to prevent trip hazards.

  10. Individual Assessments: If the backache issue persists, consider offering individual ergonomic assessments for users. A specialist can evaluate the user's workstation setup and suggest personalized recommendations.

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What is a computer system ?

A computer system refers to computer components that collectively function as a single unit to achieve the desired goal. It can also be defined as a collection of hardware, software, and liveware that work together to receive, process, and manage data

Describe two effects on society of an increase in the use of the Internet for e-commerce.

  • loss of jobs as some traditional shops/banks close
  • lower profits for companies that do not get involved with e-commerce
  • decline of leisure shopping as goods are bought on-line
  • city centres becoming deserted as shops/banks close down
  • gap between rich and poor widening as richer get savings from
  • shopping on-line
  • more people choosing to interact with computers rather than people
  • increase in small businesses
  • less pollution/travelling
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Ochieng manages a network for an organisation.
(a) Two computers are assigned the same IP address.
Explain why Ochieng must change the IP address of one of the computers.

  • Devices must have a unique IP address because otherwise, a switch would not know which of the two was the correct device to send packets to

(b) Identify the network topology that requires a server.

  • Star topology

Ochieng manages a network for an organisation.
(a) Two computers are assigned the same IP address.
Explain why Ochieng must change the IP address of one of the computers.

  • Devices must have a unique IP address because otherwise, a switch would not know which of the two was the correct device to send packets to

(b) Identify the network topology that requires a server.

  • Star topology
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Viruses, pharming and phishing are all examples of potential Internet security issues.
Explain what is meant by each of these three terms.

Virus

  • - program/software that replicates/copies itself
  • – can delete or alter files/data stored on a computer
  •  – can make the computer “crash”/run slow

Pharming -

  • malicious code/software installed on a user’s hard drive/actual webserver
  •  – this code redirects user to a fake website (without their knowledge)
  •  – to obtain personal/financial information/data

Phishing

  • - legitimate-looking emails sent to a user
  • – as soon as the recipient opens/clicks on the link in the email/attachment …
  • – … the user is directed to a fake website (without their knowledge)
  • – To obtain personal/financial information/data
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List two areas where infrared waves are used in data communication.

TV remote, wireless mouse , wireless keyboard, used by robots to gauge distance and avoid obstacles,

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State three functions of  a network  operating system

  • Allows creation and management of user accounts
  • Helps in troubleshooting of the network
  • controls access to network resources
  • Provides communication services
  • configures network resources
  •  

 

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Explain two computer hardware features that may be considered when selecting a laptop computer to be used in developing a KCSE computer studies project (4mks)

Multimedia Capability - A laptop with strong multimedia capabilities is essential for a computer studies project submitted on CD-RW. This ensures that the laptop can efficiently handle multimedia content, providing a seamless experience in creating and presenting project materials.

Processor Speed - Opting for a laptop with a high processor speed is crucial. This feature enables the smooth execution of multiple applications simultaneously, enhancing overall project efficiency and reducing processing delays.

Hard Disk Capacity - Consider a laptop with ample hard disk capacity, as the Microsoft Office suite used in computer projects requires significant space for the installation and storage of project files. A spacious hard drive ensures that there is sufficient room for data and applications.

Main Memory Capacity - Given that students often work with multiple programs concurrently during a project, it's important to choose a laptop with an adequate main memory size. A smaller main memory may result in performance issues, hindering the seamless operation of various software applications during project development.