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ANALYSIS OF KCSE COMPUTER STUDIES TOPICAL QUESTIONS & REVISION KITS

This site is a creation of all possible KCSE computer studies questions and answers
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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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Distinguish between a microwave transmission and a radio transmission.

15/1/2021

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Distinguish between a microwave transmission and a radio transmission.

​(b) Figure 1 shows a computer, network topology. Use it to answer the questions that follow.
​(b) Figure 1 shows a computer, network topology. Use it to answer the questions that follow.
(i)Identify the type of topology.
(ii) State the function of each of the parts labelled A and B. 
(c) A computer laboratory experiences power supply problems. Describe three power related problems that should be addressed.
RESPONSES
(i)Identify the type of topology. (ii) State the function of each of the parts labelled A and B. (c) A computer laboratory experiences power supply problems. Describe three power related problems that should be addressed.
b) (i) Bus topology
(ii) A - The Bus cable
  • It is a core section of the bus topology network which has all the nodes connected to it and data pass through it.
B — Terminator
  • It destroys data that does not reach its destination so that it doesn’t cause echo back.
c) Problems related to power that should be addressed
  •  Blackout: This is unexpected discontinuation of power supply in the laboratory.
  •  Power sage: Sudden drop of voltage levels that lasts less than a second.
  •  Transients! surge: High voltage flowing.
  •  Brownout: Partial blackout where there’s low voltage flow.
  •  Short circuit: live wires touching each other’s
  •  Loose connection, which may cause tripping or total power failure

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Describe three arithmetic errors that may occur during computerised data processing.

15/1/2021

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Describe three arithmetic errors that may occur during computerised data processing.

​(b) Arnold a programmer intends to create a user input interface screen for a system. State three factors that he should consider. 
(c)With the aid of an example in each case describe the following types of maintenance.
(i) adaptive; 
(ii) perfective; 
(iii) corrective. 
RESPONSES
a) Arithmetic errors
 Truncation error
  • Results due, to shortening or leaving out part of a number or a word.
  •  Rounding off error
  • Arising by approximating a number by replacing it with a number that has fewer significant digits or one with zeros for its ending digits.
 Overflow error
  • Occurs when the results of a computation is larger than the allocated memory space. 
 Underflow error
  • Type of error occurs when the output is low small to be represented in the chosen format.
b) User interface design considerations
  •  Should be user friendly.
  •  Colour, fonts and layout should be appealing to the user.
  •  Consider a consistent layout in the entire system.
  •  Should prompt user clearly.
  •  Should capture the same number of items of date as indicated in the manual data capture form.
(c)Types of maintenance
(i) Adaptive
  • Type of maintenance that is done to make the system to adopt the changing technology e.g. changing the system because to new ois
(ii) Perfective
  • Type of maintenance done to make the system better in its operation e.g. adding a module in a system.
(iii) Corrective
  • Type of maintenance done to correct an error in the system e.g.wrong results during addition.
a) Arithmetic errors Truncation error Results due, to shortening or leaving out part of a number or a word. Rounding off error Arising by approximating a number by replacing it with a number that has fewer significant digits or one with zeros for its ending digits. Overflow error Occurs when the results of a computation is larger than the allocated memory space. Underflow error Type of error occurs when the output is low small to be represented in the chosen format. b) User interface design considerations Should be user friendly. Colour, fonts and layout should be appealing to the user. Consider a consistent layout in the entire system. Should prompt user clearly. Should capture the same number of items of date as indicated in the manual data capture form. (c)Types of maintenance (i) Adaptive Type of maintenance that is done to make the system to adopt the changing technology e.g. changing the system because to new ois (ii) Perfective Type of maintenance done to make the system better in its operation e.g. adding a module in a system. (iii) Corrective Type of maintenance done to correct an error in the system e.g.wrong results during addition.

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State two qualities of a good pseudocode.

15/1/2021

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State two qualities of a good pseudocode.

  • should be short and clean precise
  •  should have start and end clearly shown.
  •  Statements should be clearly defined.
  •  should depict the logical flow of solving the problem.
  •  should not be ambiguous.
  •  it should be indented /neat / legibility

(b) With the aid of flowchart diagrams, describe each of the following programme control structures:
(i) sequence 
(ii) selection 

(i)Sequence
  • Program statements are executed one after the other in the order in which they appear.
(b) With the aid of flowchart diagrams, describe each of the following programme control structures: (i) sequence (ii) selection
(ii) Selection
(b) With the aid of flowchart diagrams, describe each of the following programme control structures: (i) sequence (ii) selection

​(c) Draw a programme flowchart that would accept three numbers and find their sum. If the sum is greater than 200. It adds 30 to the sum, otherwise subtracts 20 from the sum. The programme should then display the results. 

​(c) Draw a programme flowchart that would accept three numbers and find their sum. If the sum is greater than 200. It adds 30 to the sum, otherwise subtracts 20 from the sum. The programme should then display the results.

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

13/1/2021

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

  • It could lead to back problems if the desk is of an unrealistic height.
  •  If it does not provide good positioning of the monitor, it could result in eye strain.
  •  Wrist problems will arise if the keyboard and mouse seating positions are bad.
  •  Injury as a result of falling computer components due to weak computer desks/ small size.
(b i)Describe two ways in which a positive number and a negative number can be represented in a computer 
  •  In binary one bit usually the most significant or leading bit is used to indicate either positive or negative,and store the unsigned binary representation of the magnitude in the remaining bits.
  •  Signed magnitude.
  •  Using the twos complement.
  •  Using the ones complement.
(ii) A particular computer stores numbers in a single 8-bit word.
Determine how the number 0.3125 base 10 would be represented. 
No.18.(a) Explain two health issues that could arise from the use of unsuitable computer desk. It could lead to back problems if the desk is of an unrealistic height. If it does not provide good positioning of the monitor, it could result in eye strain

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With the aid of a diagram, describe the Hierarchical Database Model.

13/1/2021

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With the aid of a diagram, describe the Hierarchical Database Model.

With the aid of a diagram, describe the Hierarchical Database Model.
Data items are arranged in a tree like format.
  •  Access is through a single path and all from one single item called the root component
(b) List three factors that should be considered when developing a database application and give reasons why each should be considered.
Factors
  •  Complexity of data/user needs/user friendliness
  •  Security and integrity
  •  Complexity of DBMS
  •  Volume of data/size
  •  Software compatibility with existing DBMS
  •  Cost of the data base
Reasons
  •  Complexity of data - Complex data requires complex DBMS.
  •  Security and integrity - Data which is intended to be secured in terms of access, can be handled by complex DBMS which provides for such requirements.
  •  Complexity of DBMS - Complex DBMS do require complex skills, hence more training. It is therefore costly to run/use such system.
  •  Volume of data - Voluminous data require to be ran on stable application.
  • They also take up extra computer system resources.
  •  Software compatibility - enables pre-existing databases to be exported to the new one.
(c) (i) Name three types of validation checks during data entry in data processing.
  •  Field type/data type
  •  Field size
  •  Format
  •  Reasonableness
  •  Range constraint
  •  Presence check
(ii) Differentiate between primary key and index key as used in databases. 
  •  Any index key is a database feature used to speed up search and sort operations in a table; whereas
  •  A primary key is a field that enforces uniqueness in a table so that one record is not entered twice or a primary key is a field that uniquely identifies each record.

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Figure 1 shows a flowchart. Use it to answer the questions that follow.

13/1/2021

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Figure 1 shows a flowchart. Use it to answer the questions that follow.

Figure 1 shows a flowchart. Use it to answer the questions that follow.
(a) Interpret the flowchart. 
(b) Write a pseudo code for the flowchart. 

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Explain two ways in which the use of internet could make reporting of corruption easier

10/1/2021

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Explain two ways in which the use of internet could make reporting of corruption easier

(b) Explain two circumstances under which the use of wireless communication would be preferred in data communication. 
(c) Figure 2 is an extract of a spreadsheet showing what the students had targeted to score and the actual score in a computer remedial class.
(b) Explain two circumstances under which the use of wireless communication would be preferred in data communication. (c) Figure 2 is an extract of a spreadsheet showing what the students had targeted to score and the actual score in a computer remedial class.
A performance factor is obtained by subtracting the target score from the actual score and dividing the difference by the target score.
Write a formula that uses cell references only that would be entered in cell:
(i) D2 to compute the performance factor. 
(ii) E2 to display the statement ‘more remedials’ if the performance factor is less than zero, ‘exempted’ if the factor is greater than zero and ‘optional remedials’ if otherwise. 
(iii) D8 to display the best performance factor. ​​
RESPONSES
(a) Ways ¡n which internet makes reporting of corruption easier.
  •  Interactiveness: the internet based technology enables real-time dialogue hence instantaneous reporting of cases;
  •  Outreach: the technology allows the coverage of wide areas/can be reported from anywhere;
  •  Social mobilisation: It is easy to use technology to create a network with people or organisations with similar concerns;
  •  Anonymity: With use of the technology, it has become easy to report corruption cases without being known;
  •  Security: The message sent reaches the destination with less risk of being intruded.
(b) Circumstances when wireless is preferred
  •  When the targetted recipients are many and diverse e.g. different  platforms, devices, geographical locations.
  •  When the sender or receiver is mobile and it in practical to use wired media.
  •  When there is no space or it is inconvenient to lay cables e.g in a congested town.
  •  When the distance of travel is very big e.g extraterestial communication.
A performance factor is obtained by subtracting the target score from the actual score and dividing the difference by the target score. Write a formula that uses cell references only that would be entered in cell: (i) D2 to compute the performance factor. (ii) E2 to display the statement ‘more remedials’ if the performance factor is less than zero, ‘exempted’ if the factor is greater than zero and ‘optional remedials’ if otherwise. (iii) D8 to display the best performance factor. ​​
  • Use of the 1F function
  • First selection & output
  • Second selection & output
  • Last selection & output
(iii) = Max (D2:D7)

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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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State three functions of networking operating systems other than providing network security.

10/1/2021

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State three functions of networking operating systems other than providing network security.

​(b) Explain three ways in which an operating system provides data security in a computer system. 
(c) Explain three circumstances under which observation method may be preferred during data collection. 
(a) Functions of network operating systems
  •  Provide access to network resources;
  •  Supporting network services like protocols;
  •  Support communication;
  •  Respond to requests from applications;
(b) Ways in which an operating system provides data security
  •  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/malicious persons;
  •  Log files - A means by which transactions in a computer system can be recorded thereby deterring potential infiltrators;
  •  Alerts - Alerting a user when he/she is about to delete a file/folder.
(c)Preference of observation during data collection
  •  When the subjects that are being observed need not be made aware of the fact;
  •  When there is need to directly see what subjects do rather than rely on what they tell you;
  •  When there is need to collect data without interfering with the working of the subjects;
  •  When nature of data can only be collected via observation e.g. traffic flow;
  •  When collecting data in situation that subjects may be unwilling to give information.
​(b) Explain three ways in which an operating system provides data security in a computer system. (c) Explain three circumstances under which observation method may be preferred during data collection.

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In the BCD number coding scheme, letter A is represented by 110001 and letter B by 110010. Determine how the word CAB is coded in BCD.

10/1/2021

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In the BCD number coding scheme, letter A is represented by 110001 and letter B by 110010. Determine how the word CAB is coded in BCD.

​(ii) Convert the decimal number 11.125 to its binary number system equivalent. 
(iii) Perform the binary arithmetic: 111.01 + 1011.111 — 101.011 and convert the answer to decimal notation. 
(b) Explain the importance of each of the following in word processing:
(i) tab stops; 
(ii) section breaks. 
(c) State three documents that are used during mail merging in word processing.
ANSWERS
​(ii) Convert the decimal number 11.125 to its binary number system equivalent. (iii) Perform the binary arithmetic: 111.01 + 1011.111 -- 101.011 and convert the answer to decimal notation. (b) Explain the importance of each of the following in word processing: (i) tab stops; (ii) section breaks. (c) State three documents that are used during mail merging in word processing.
​(ii) Convert the decimal number 11.125 to its binary number system equivalent. (iii) Perform the binary arithmetic: 111.01 + 1011.111 -- 101.011 and convert the answer to decimal notation. (b) Explain the importance of each of the following in word processing: (i) tab stops; (ii) section breaks. (c) State three documents that are used during mail merging in word processing.
​(ii) Convert the decimal number 11.125 to its binary number system equivalent. (iii) Perform the binary arithmetic: 111.01 + 1011.111 -- 101.011 and convert the answer to decimal notation. (b) Explain the importance of each of the following in word processing: (i) tab stops; (ii) section breaks. (c) State three documents that are used during mail merging in word processing.
(b) Importance of tab stops and section break
  • (i) Tab stop: when tab stops are set, they allow aligning of text into columns;
  • (ii) Section breaks: Allows splitting of a document into different sections so that different formatting styles can be applied to the different sections.
(c) Documents used during mail merge
  •  Main document - primary/secondary/data source
  •  The address list - the intended recipients of the document.
  •  The merged document - final document ready for printing or sending.

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List four web programming languages.

10/1/2021

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List four web programming languages.

  •  HTML - Hyptertext Mark-up Language
  •  Java script
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State four ways in which a programmer can make program code easy to fol1ow 

 Using modules or short blocks of program/functions/procedures;
 Making internal documentation / comments;
 Using meaningful variable names and user words in the program;
 Using indent to represent nested statement:
 Using blank lines to separate blocks of code statement;
 Test formatting of reserved words e.g. bolding

​Draw a program flowchart to represent the following pseudocode. 

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Describe the octal number system.

7/1/2021

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Describe the octal number system.

(a) Describe the octal number system.

(b) Convert each of the following to the number system indicated:

(i) 111.1012 to decimal;

(ii) 14.687510 to binary.

(c) Convert the number -17 10 into 8-bit:

(i) signed magnitude representation;

(ii) two’s complement.

(d) Perform the arithmetic operation

110.112 + 11.0112

RESPONSES
(a) Characteristics of octal number system.
  •  each symbol is represented by 3 bits.
  •  The number is made of 8 symbols 0. 1. 2,…….. 7;
  •  Maximum value of a single digit is 7 (one less than the value of the base);
  •  This number system uses base 8.
(b) Convert each of the following to the number system indicated: (i) 111.1012 to decimal; (ii) 14.687510 to binary. (c) Convert the number -17 10 into 8-bit: (i) signed magnitude representation; (ii) two’s complement. (d) Perform the arithmetic operation 110.112 + 11.0112
(b) Convert each of the following to the number system indicated: (i) 111.1012 to decimal; (ii) 14.687510 to binary. (c) Convert the number -17 10 into 8-bit: (i) signed magnitude representation; (ii) two’s complement. (d) Perform the arithmetic operation 110.112 + 11.0112
(b) Convert each of the following to the number system indicated: (i) 111.1012 to decimal; (ii) 14.687510 to binary. (c) Convert the number -17 10 into 8-bit: (i) signed magnitude representation; (ii) two’s complement. (d) Perform the arithmetic operation 110.112 + 11.0112

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