Computer studies analysis of questions and answers

Describe the term portability as used in the following context.

30/4/2022

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Describe the term portability as used in the following context.

Hardware

In hardware portability is the ease of carrying a hardware component or computer from one place to another with ease

Software

In software portability is the ease of copying or installing a program from one computer to another

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Peter used a compact disk recordable to save his work. ½ of the disk was used to store video files while ¼ of the remainder was to save audio file. Note that CD-recordable is 700MB. Calculate the remaining space in bytes.

30/4/2022

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PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

Video =0.5 x 700= 350 …………………… ½ mark
Audio = 0.125 x 700=87.5 ………………… ½ mark
Total = 437.7 …………………… 1mark
Remaining spaces (700-437.5) = 262.5MB ………… 1mark

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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

HARDCOPY OUTPUT DEVICES such as
1. printer
2. plotter
3. com
SOFTCOPY OUTPUT DEVICES such as
1. monitor
2. speakers
3. light emitting diode
4. projector

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List three uses of DVDs

13/11/2021

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List three uses of DVDs. (3mks)

entertainment – e.g. music, movie
distribution of software
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)

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

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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

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Explain two problems associated with the computer hard disk.

15/1/2021

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Explain two problems associated with the computer hard disk.

Problems of computer hard disk

Excessive shock like dropping it on the hard surface may cause the platters to dislocate hence reading may be a problem
Contact with strong magnetic fields or static electricity may affect the device since data is saved magnetically.
If the case containing the platters is opened, dust may get into it causing disk crash,
Some viruses may create virtual tasks which will eventual cause the disk to be overwork hence causing it to crash
Sporadic power failure may cause the disk to crash.

Explain two problems associated with the computer hard disk.

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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

Volume of work to be printed.
Maintenance cost below e.g. consumables like toners should be affordable.
Speed of printing.
Type of work to be printed; type of paper, paper size/user needs /range of capability.
Type of printout whether colour is required or not.
Compatibility with the existing hardware
Initial cost
availability of in the market
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 the meaning of the term computer software.

14/1/2021

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State the meaning of the term computer software.

Computer software

It is a set of programs written in a computer language to direct a computer on how to perform a particular task or behave in a certain way.

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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

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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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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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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List two techniques of acquiring electronic images to be used in a desktop publishing program.

10/1/2021

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List two techniques of acquiring electronic images to be used in a desktop publishing program.

(ii) Describe two layout guides in a desktop publishing program (DTP) that assist a user to place an object in a preferred position.
(b) Explain three ways of ensuring that data submitted for processing is accurate.
(c)An engineering company requires a computer system to design roads and bridges.
Explain one suitable choice for:
(i) output device;
(ii) software.

RESPONSES

(a) (i) Ways of acquiring images in DTP:

Scanning;
Picture capture via camera;
downloading;
getting from secondary storage.

(ii) Layout guides

Ruler guides: a ruler on the edges of the page that guides a user to position objects and resize them;
Margin guides: used to define page margins so that the user will be prevented from placing objects in non-printable areas of the page;
Column guides: Vertical lines used to divide a page into two or more columns;
Row guides: Lines used to divide a publication page into two or more section to help structure the layout;
Snap points: Positions on the screen where the object is stuck on.

(b) Ways of ensuring accuracy of data during data processing

Data is stored in secondary storage in such a way that access to it is controlled.
Encrypting of data before it is transmitted to minimize chances of it being compromised during transmission.
Use of validation methods to ensure that data is correct at the point of input.
Use of direct data capture methods which eliminates human errors.
Use of verification methods.

(c) (i) Output device: A plotter because it prints large size drawings to high precision.
(ii) A CAD software because it facilitates in the design of engineering drawings.

(ii) Describe two layout guides in a desktop publishing program (DTP) that assist a user to place an object in a preferred position. (b) Explain three ways of ensuring that data submitted for processing is accurate. (c)An engineering company requires a computer system to design roads and bridges. Explain one suitable choice for: (i) output device; (ii) software.

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Describe the term portability as used in the following context.

Describe the term portability as used in the following context.

Peter used a compact disk recordable to save his work. ½ of the disk was used to store video files while ¼ of the remainder was to save audio file. Note that CD-recordable is 700MB. Calculate the remaining space in bytes.

PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

STATE TWO TYPES OF COMPUTER OUTPUT DEVICES

EXPECTED RESPONSE

HARDCOPY OUTPUT DEVICES such as

SOFTCOPY OUTPUT DEVICES such as

List three uses of DVDs

List three uses of DVDs. (3mks)

Define portability as used in software selection

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

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

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

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

Explain two problems associated with the computer hard disk.

Explain two problems associated with the computer hard disk.

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

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

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

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

State the meaning of the term computer software.

State the meaning of the term computer software.

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

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

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

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

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

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

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

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

List two techniques of acquiring electronic images to be used in a desktop publishing program.

List two techniques of acquiring electronic images to be used in a desktop publishing program.

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​​Describe the term portability as used in the following context.

​PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

EXPECTED RESPONSE

HARDCOPY OUTPUT DEVICES such as

SOFTCOPY OUTPUT DEVICES such as

List three uses of DVDs. (3mks)

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

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

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

Explain two problems associated with the computer hard disk.

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

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

State the meaning of the term computer software.

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

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

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

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

List two techniques of acquiring electronic images to be used in a desktop publishing program.

Categories

Archives

Describe the term portability as used in the following context.

PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

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

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