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COMPUTER STUDIES REVISION KITS FORM 1 2022 TERM 2 PAPER 1 MODEL17092022008

17/9/2022

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computer_studies_revision_kits_form_1_2022_term_2_paper_1_model17092022008.pdf
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STATE TWO TYPES OF COMPUTER OUTPUT DEVICES

24/1/2022

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  • LEVEL: FORM 1
  • TOPIC: COMPUTER SYSTEMS
  • ​SUB-TOPIC: OUTPUT DEVICES


EXPECTED RESPONSE

  1. HARDCOPY OUTPUT DEVICES such as

    1. printer
    2. plotter
    3. com
  2. SOFTCOPY OUTPUT DEVICES such as

    1. monitor
    2. speakers
    3. light emitting diode
    4. projector

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​A computer diskette in drive A has folders for MEMOS for an administrator. Each of these folders is labelled according to the relevant months.

17/11/2021

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​A computer diskette in drive A has folders for MEMOS for an administrator. Each of these folders is labelled according to the relevant months. The secretary created the folders for each month’s memo for each of access. Study the table below 

A computer diskette in drive A has folders for MEMOS for an administrator. Each of these folders is labelled according to the relevant months. The secretary created the folders for each month’s memo for each of access. Study the table below
A computer diskette in drive A has folders for MEMOS for an administrator. Each of these folders is labelled according to the relevant months. The secretary created the folders for each month’s memo for each of access. Study the table below

(a) Assuming that the secondary was working from the diskette, draw the corresponding tree structure (6mks)   

Assuming that the secondary was working from the diskette, draw the corresponding tree structure

(b) (i) The secretary wanted to create a folder to store a memo in Fraud folder. State the path for that     folder. (2mks)

​ A:/MEMO2/Fraud

(ii) Suggest how the secretary can ensure that the work in that diskette is not spoilt. (1mk)

  • do not drop the diskette down
  • don’t put heavy objects on top 
  • don’t put near magnets
  • don’t remove from drive when still being read / written

​(iii) The content of the file is not viewed by any other person apart from her. (1mk)

​use of password

(c) (i) List any two devices under the control of the operating system. (2mks)

  • I/O 
  • CPU
  • memory
  • secondary storage
  • communication & ports

​(ii) Explain how each one of these devices are controlled by the OS - Operating System

Input/output devices and ports
In most cases, the operating system controls all data input and information output tasks. Because most input/output devices are slower than the processor, the operating system has to control the flow of data from the time of input to the time the user receives it as information. It ensures that the right data reaches the processor at the right time. The operating system also defines the various input/output ports found on the computer e.g. printer port.
​The processor
The processor is a scarce resource. It executes tasks called processes. At any one time several tasks may require processing hence creating competition. The operating system arranges the tasks according to priority and has the ability to stop a particular task to allow the processor to service another one.


​Main memory(RAM)
At any one given time so many tasks may require the memory so that they can be accessed and processed by the computer.However,because memory is also a scarce resource,the operating system determines which task will remain in memory awaiting for execution and which one will be sent back to secondary storage to wait.

Because the operating system is large and very important, it is usually installed on the hard disk but must be loaded to RAM during the booting process. Not all the operating system can fit in RAM so a small special part that contains the most necessary commands and procedures called the kernel is the one that is loaded.
Secondary storage devices
The operating system manages the storage and retrieval of data on secondary storage devices. It also utilizes the free space on hard disks to enhance the performance of the computer by temporarily holding tasks on it that were in RAM ready for processing but have to wait for sometime.
Communication devices and ports
Communication in this case refers to how the various devices and programs in and out of the computer system send and receive messages from one another and from the processor. The operating system controls the overall communication process between various tasks and computers. External communication can be achieved by connecting an external device to a communication port using a communication medium like cables or even wireless communication.



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​List four factors to be considered when purchasing an operating system

15/11/2021

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​List four factors to be considered when purchasing an operating system. (2mks)

  1. hardware configuration
  2. basic design of the computer e.g. IBM, APPLE
  3. applications intended for the computer
  4. user friendliness or HCI
  5. End User Licence Agreement (EULA) and other documentations
  6. Initial cost
  7. Maintenance cost
  8. Expandability/upgradeability 



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How does an operating system manage computer memory?

15/11/2021

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How does an operating system manage computer memory (2mks)

  1. organize the main memory into blocks of sizes called partitions
  2. assigns main memory storage partitions to data and instruction
  3. access to data is given using addressing the partition



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List three uses of DVDs

13/11/2021

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List three uses of DVDs. (3mks)

  1. entertainment – e.g. music, movie
  2. distribution  of software
  3. archival storage

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Define portability as used in software selection

13/11/2021

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Define portability as used in software selection. (1mk)

​Portability refers to whether a program can be copied or installed in more than one computer

​List four ways of acquiring software in an organization. (2mks)

  1. in-house developed programs
  2. venue at the-shelf software purchase through a vendor
  3. open source



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​State the function of the following keys on the computer keyboard

12/11/2021

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​State the function of the following keys on the computer key board (2mks)

​(a) Insert

Used to switch between the two typeover modes i.e.
  1. insert mode and;
  2. typeover mode

​(b) Delete

​Delete characters from the cursor position from left to right
​State the function of the following keys on the computer keyboard

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​State two practices to be observed in order to ensure the safety of the computer user

12/11/2021

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​State two practices to be observed in order to ensure the safety of the computer user. (2mks)

  1. Computer room should be well lit to avoid eye strain
  2. Avoid over bright wall paints that reflect too mush light causing eye strain
  3. Adjust brightness of the computer monitor until the eyes feel comfortable before using the computer
  4. Use/fit the monitor with radiation filter screens
  5. Avoid using flickering monitor
  6. Seat for the user must be comfortable and have a straight backrest that allows someone to sit upright
  7. Take frequent breaks while working with a computer

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​Differentiate between a line printer and a page printer as used in computers

3/3/2021

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​Differentiate between a line printer and a page printer as used in computers. (2 marks)

​A line printer is an impact printer that prints one entire line of text at a time
while a page printer is a non impact printer that prints a Whole page at a timer
​Differentiate between a line printer and a page printer as used in computers

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A school has been advised to employ a database administrator. State three responsibilities of this personnel in the school.

15/1/2021

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A school has been advised to employ a database administrator. State three responsibilities of this personnel in the school.

​(b) Explain two ways in which computers can be used in the transport industry. 
(c) Mary was advised to partition a hard disk for her computer. Explain two reasons that may have necessitated this. 
(d) Explain a reason for conducting each of the following studies in systems development:
(i) Schedule feasibility; 
(ii) Technical feasibility. 
RESPONSES
a) Possible responsibilities of a database admin in a school
  •  Carrying out school database backups.
  •  Recovering of lost school data incase of system failure.
  •  Ensuring the security and integrity of the school system.
  •  Adding new users to the school system and managing the user’s accounts.
  •  Designing and developing database application for the school.
  •  Updating or maintaining database for the school.
b) Ways in which computers can be used in a transport industry.
  •  Use of GPS to track vehicles, flights etc.
  •  Bookings to different destinations can be done through the use of computers ( online booking).
  •  The computers can also be used to reduce the speed of vehicles and bring sanity in the industry.
  •  Managing human resource involved in the industry.
c) Reasons for partitioning hard disk
  •  For security purposes, incase one partition fails the second partition remains functional.
  •  If she requires backup copies to be stored in the same hard disk.
  •  If she intends to install more than one operating system.
d) (I Schedule feasibility
  •  To determine if the proposed solution can be developed within the required time.
(ii) Technical feasibility
  •  To determine if the system can be supported by the available technology.
​(b) Explain two ways in which computers can be used in the transport industry. (c) Mary was advised to partition a hard disk for her computer. Explain two reasons that may have necessitated this. (d) Explain a reason for conducting each of the following studies in systems development: (i) Schedule feasibility; (ii) Technical feasibility.

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State two ways through which a computer user can minimise Repetitive Strain Injuries (RSI) associated with the use of a computer.

15/1/2021

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State two ways through which a computer user can minimise Repetitive Strain Injuries (RSI) associated with the use of a computer.

  1.  Taking regular break intervals when using a computer.
  2.  Use an ergonomic keyboard to avoid stress.
  3.  Support wrist with wrist rest pad when using a mouse.
  4.  Use of standard furniture/proper sitting posture.
State two ways through which a computer user can minimise Repetitive Strain Injuries (RSI) associated with the use of a computer.

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A computer technician has observed a lot of dust on computers in the computer laboratory.

14/1/2021

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A computer technician has observed a lot of dust on computers in the computer laboratory.

State three precautions that need to be put in place to avoid this.

  1.  Fit ventilating I air conditioning system to allow free circulation of air.
  2.  Fit curtains on the windows / add a curtain net to reduce dust entry into the laboratory.
  3.  Regularly use of a blower or vacuum cleaner/mob to blow dust from the computer parts.
  4.  Avoid entering the laboratory with materials that may have dust such as shoes.
A computer technician has observed a lot of dust on computers in the computer laboratory.

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Describe each of the following computer cables: Parallel cable and Serial cable;

14/1/2021

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Describe each of the following computer cables: Parallel cable and Serial cable;

Description of computer cables
a) Parallel cable
  • It is a communication cable which has high speed of transmission and transmits several bits at the same time.
b) Serial cable
  • It is a communication cable which has low speed of transmission and bits follow one another in sequence or are transmitted one at a time.
Describe each of the following computer cables: Parallel cable and Serial cable;

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The management of an organisation intends to purchase a printer. State three factors that they should consider during the purchase

14/1/2021

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The management of an organisation intends to purchase a printer. State three factors that they should consider during the purchase

Factors to consider when purchasing a printer
  1.  Volume of work to be printed.
  2.  Maintenance cost below e.g. consumables like toners should be affordable.
  3.  Speed of printing.
  4.  Type of work to be printed; type of paper, paper size/user needs /range of capability.
  5.  Type of printout whether colour is required or not.
  6.  Compatibility with the existing hardware
  7.  Initial cost
  8.  availability of in the market
  9.  Portability / physical size
The management of an organisation intends to purchase a printer. State three factors that they should consider during the purchase

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State three characteristics of mainframe computers.

14/1/2021

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State three characteristics of mainframe computers.

Characteristics of mainframe
  •  They have bigger memory capacity.
  •  Have high processing power.
  •  It supports multiprocessing.
  •  Supports large number of users at the same time/ Supports several peripheral devices.
  •  Runs so many applications at the same time.
State three characteristics of mainframe computers.

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State three features of fifth generation computers.

14/1/2021

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State three features of fifth generation computers.

Features of fifth generation computers
  •  Use of expert system .
  •  Support the use of natural language
  •  Support distributed computing
  •  Support artificial intelligence and voice recognition.
  •  Support parallel processing
  •  Small in size? portable
  •  Superior hardware and software
  •  consume less power
State three features of fifth generation computers.

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Explain three ways in which an operating system provides data security in a computer system

14/1/2021

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Explain three ways in which an operating system provides data security in a computer system

Access control:
  •  Deals with the problem of verifying /authenticating the identity of a user before permitting access to the request resource (e.g. use of passwords, user account);
Encryption
  •  Transforming data into an unreadable format so that they are safely transmitted;
Firewalls
  •  Filters out unwanted data and programs/criminals/hackers/malicoius persons;
Log files
  •  A means by which transactions in a computer system can be recorded thereby detering potential infiltrators;
  • Alerts
  •  Alerting a user when he/she is about to delete a file/folder.
(b)State two instances where observation is not a viable method of gathering data during system analysis stage. 
  •  When the analyst wants to collect confidential information,
  •  When there is a large group of people involved in the system,
  •  Where the people you want to gather information from are vastly dispersed
(c) (i) State the role of each of the following data communication devices:
I. repeater 
  •  A device used to re-construct data signal during data transmission to its original strength/amplify/boost/regenerate.
II. router. 
  •  It is a device used to facilitate movement of data or packets between two or more LANS of different configuration (expansion of networks).
  •  Delivers a packet/data directly to destination computers.
  •  Interconnects different networks/provides network services.
(ii) The figure below shows a network based on the bus topology.
(b)State two instances where observation is not a viable method of gathering data during system analysis stage. When the analyst wants to collect confidential information, When there is a large group of people involved in the system, Where the people you want to gather information from are vastly dispersed (c) (i) State the role of each of the following data communication devices: I. repeater A device used to re-construct data signal during data transmission to its original strength/amplify/boost/regenerate. II. router. It is a device used to facilitate movement of data or packets between two or more LANS of different configuration (expansion of networks). Delivers a packet/data directly to destination computers. Interconnects different networks/provides network services. (ii) The figure below shows a network based on the bus topology.
I. Identify the component labelled P.
  •  The component P is the terminator.
II. State the function of the component labelled P.
  •  Terminator in a backbone is used to prevent data signal from bouncing back/absorb signals.

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Figure 2 shows a block diagram of a computer system and its peripheral devices. Use it and answer the questions that follow.

14/1/2021

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Explain two health issues that could arise from the use of unsuitable computer desk.

No.19.(a) Figure 2 shows a block diagram of a computer system and its peripheral devices. Use it and answer the questions that follow. (i)Name two devices that may be used for storing data for a long duration. 2GB HDD 32 MB Rom (ii) Name three peripheral devices that are used for input. Mouse Scanner CD drive (iii)Name two other devices that a Computer Aided Design (CAD) user might wish to add to the set up above in order to perform his tasks effectively. Digitizer Keyboard USB port 19 (b) A customer wishes to purchase a computer system. The customer can buy word processor, spreadsheet, database, and a drawing package separately or as an integrated package. State three reasons why the customer would prefer an integrated package to separate packages The software provides easy movement of data among the separate applications, A common group of commands is used for all the applications in the software package, Provides easy switching between functions without having to go back to the operating system and ability to share data between functions.
(i)Name two devices that may be used for storing data for a long duration.
  •  2GB HDD
  •  32 MB Rom
(ii) Name three peripheral devices that are used for input.
  •  Mouse
  •  Scanner
  •  CD drive
(iii)Name two other devices that a Computer Aided Design (CAD) user might wish to add to the set up above in order to perform his tasks effectively. 
  •  Digitizer
  •  Keyboard
  •  USB port
(b) A customer wishes to purchase a computer system. The customer can buy word processor, spreadsheet, database, and a drawing package separately or as an integrated package. State three reasons why the customer would prefer an integrated package to separate packages
  •  The software provides easy movement of data among the separate applications,
  •  A common group of commands is used for all the applications in the software package,
  •  Provides easy switching between functions without having to go back to the operating system and ability to share data between functions.

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The C directory of a computer has folders named Form 1, Form 2,Form 3 and Form 4. Each class has students' folders named according to their admission number. The students created their own folder for subjects they are studying based on the table shown be

12/1/2021

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The C directory of a computer has folders named Form 1, Form 2,Form 3 and Form 4. Each class has students' folders named according to their admission number. The students created their own folder for subjects they are studying based on the table shown below:
Picture
(a) A form four student intends to create a folder named proj to store project documents.
State the path for the project folder. 
  •  C:\FORM4\STUDNO\ADB\PROJECT
(b) Suggest how the student can ensure that:
(i) work is not lost in case the hard disk fails; 
  •  Keep backup copies of the project on offline secondary storage media.
(ii) the project is not copied by other students. 
  •  Use passwords for opening and modifying the project

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Headache, back and neck pain may result from the use of computers.

12/1/2021

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Headache, back and neck pain may result from the use of computers.

State how each of them can be minimised. 
Headache
  •  Use of filters/antiglare.
  •  Proper lighting.
  •  Regular break.
Back & Neck Pain
  •  Proper/correct furniture for the computer.
  •  Correct position of the screen.
  •  Correct sitting posture.
  •  Taking a break.
Headache, back and neck pain may result from the use of computers.

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State the functions of each of the following keys on the computer keyboard:

12/1/2021

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State the functions of each of the following keys on the computer keyboard:

(a) backspace;
  •  moves the display cursor one position backwards, deletes the character at that position, and shifts back the text after that position by one position
(b)insert (ins)
  •  When insert is selected, keys add characters to the screen at the cursor (insertion point) without deleting those already there. When typeover is selected the new characters type over the old, deleting them as they go
State the functions of each of the following keys on the computer keyboard:

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​State the hardware technological differences between the second generation and the third generation computers

11/1/2021

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​State the hardware technological differences between the second generation and the third generation computers. (2 marks)

Second Generation Computers

  1. Low memory
  2. Less powerful processing speed
  3. Used transistors to process

Third generation computers

  1. Larger memory
  2. More powerful processing speed
  3. Used integrated circuits to process
honeywell 200
the honeywell 200 was an example of 2nd generation computer

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​State two ways of ensuring proper ventilation in a computer room

11/1/2021

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​State two ways of ensuring proper ventilation in a computer room. (2 marks)

  1. Opening windows while the computer laboratory is in use
  2. Avoid overcrowding of learners and computers
  3. Sufficient installation points should be installed in the room
  4. The room should have large & enough windows & doors
  5. Installing an air-conditioning system.
  6. Installing cooling fans.
​State two ways of ensuring proper ventilation in a computer room

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Identify the appropriate computer output device suitable for each of the following tasks:

10/1/2021

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State the meaning of the term disk defragmentation as used in computers.

(a) generating receipts where carbon copies are required; 
(b)an architectural drawing where precision is required; 
(c) producing document output for a visually impaired person.
​(a)Carbon copies - impact printers e.g. dot matrix.
(b)Architectural design - plotter
(c)Visual impairment - speakers/brailles
Identify the appropriate computer output device suitable for each of the following tasks:

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