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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
Picture

A firm intends to purchase new software. List three items that should accompany the software

26/12/2020

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(a) A firm intends to purchase new software. List three items that should accompany the software (3mks)

  • Installation guide
  • Service/ maintenance contract
  • A reference Manual (Documentation)
  • A license
  • A user guide
  • Training
Picture

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What are computer viruses?

26/12/2020

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(a) What are computer viruses?

​A computer program designed specifically to damage other programs or cause irregular behaviour. 
Picture

(b)
​(i) State two ways through which computer viruses may be controlled (2mks)

  • Using an up to date antivirus
  • Brute management policies & procedures e.g. restricting the movement of diskettes and flash/memory sticks .
  • Effective management of computer networks and internet by limiting suspected unsafe sites.

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Andrew, Jane, David and Zablon had tea, sausages and bananas for breakfast ...

26/12/2020

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​Andrew, Jane, David and Zablon had tea, sausages and bananas for breakfast. They took one sausage, two sausages, three sausages and one sausage respectively. In addition, they took a cup of tea and two bananas. Tea, sausages and bananas cost Kshs 10, 15 and 5 respectively.
​By naming columns A, B, C … and rows 1, 2, 3 …………….

​(a) Construct a worksheet showing the above information (7mks)

spreadsheet's worksheet

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What is meant by data communication in a computer network?

26/12/2020

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​What is meant by data communication in a computer network?   

Movement of computer information from one point to another by means of electrical or optional transmission system.  Such systems are often referred to as data communication networks.
coaxial cable
coaxial cables

State what is meant by each of the following transmission media and give one advantage and one disadvantage for each.


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A program for reading student’s name and scores obtained in two subjects

26/12/2020

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​A program is required for reading in a student’s name and scores obtained in two subjects. The output of the program will consist of the student’s name, the two scores, the average of the two scores and comment.  The comment is based on the average as follows:

Picture
​Write a program to solve the problem using a high level language (15 mks)

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What is the use of the search and replace feature in a word-processor

26/12/2020

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​What is the use of the search/find and replace feature in a word-processor?

​What is the use of the search/find and replace future in a word-processor?
Find and Replace is a feature in word processors that aid users to find words or phrases in a document and replacing them with other words/phrases

Use of the search/find and replace feature

  1. To locate a particular word or character or text
  2. To locate and replace the occurrence of a particular word/text or character with another

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List three file organization methods in a computer.

26/12/2020

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computer files organization methods

Quick Response

  • Serial (heap)
  • Sequential
  • Random
  • Indexed Sequential

Detailed Response


List of file organization methods in a computer

File organization refers to the way data is stored in a file. File organization is very important because it determines the method of access, efficiency, flexibility and storage devices to be used. There are four methods of organizing files on a storage media namely: Sequential, random, serial and indexed- sequential

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Explain any three of the terms: Creating, editing, printing and saving as used in word- processing.

26/12/2020

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Explain any three of the terms: Creating, editing, printing and saving as used in word- processing. ​

Creating

Creating means ​starting a new document
Creating a word document
Creating a word document

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Distinguish between system software and application software.

26/12/2020

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Differences between system software and application software

System Software

Unix OS is an example of system software
Unix OS is an example of system software
​System software refers to a set of instructions/codes/programs/applications designed to control hardware resources of a computer, performance, communications and manufacturer’s settings.

They also act as an interface between the user of application software and hardware resources. Examples include:
  • firmware,
  • utility software,
  • networking software and
  • operating systems.

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In the following flowchart, what will be the value of the sum when printed?Show how you arrive at your answer.

26/12/2020

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​In the following flowchart, what will be the value of the sum when printed?
Show how you arrive at your answer.
In the following flowchart, what will be the value of the sum when printed? Show how you arrive at your answer.
Expected response
Picture

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State with examples the meaning of MICR and OMR scanners

25/12/2020

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​State what is meant by each of the following and give an example of where each is used
  1. Magnetic Ink character Recognition (MICR) (2 mks)
  2. Optical Mark Read (OMR) (2mks)

​Magnetic Ink character Recognition (MICR)

Magnetic Ink character Recognition (MICR)
Magnetic Ink character Recognition (MICR)

Scanner

Magnetic Ink character Recognition (MICR)


Definition

MICR is a magnetic character recognition technology used mainly by the banking industry to streamline the processing and clearance of cheques and other documents. MICR scanner is used to detect special marks on a piece of papers and interpret it using a special piece of software. MICR are mainly used in banks to eliminate fraud.


Technology

Each check is printed with a series of characters on the bottom of the document.
These characters are printed with a special type of ink that has additional magnetic resonance characteristics allowing it to absorb and emit a magnetic signal.  As the check enters the scan path, the magnetic ink passes over a magnet in the scanner to “charge” the ink before it passes over the MICR read head.  

The MICR read head is a device built into the scanner designed to read the magnetic signal emitted by the MICR ink characters on the check.

Each character produces a unique waveform which is read and translated by the MICR read head.  

Challenges to accurately reading the MICR characters include the speed at which the characters pass by the MICR read head, the consistency of the ink on the document, the quality of the ink on the document, the MICR algorithm used to interpret the signals, and the quality of the MICR read head.


Uses

They are used in banks in processing and clearance of cheques and other documents such as invoices, rebate coupons, financial forms etc.


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List the steps that you would use to correct wrongly spelt words in a document using the spell-checking feature.

25/12/2020

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​Checking all the spelling and grammar in a file at the same time is useful when you want to proof your text. You can check for possible mistakes and then confirm each correction.

Step 1: Start spelling and grammar tool

​Start the spell checker e.g.press f7 or click on the spelling and grammar tool
procedure for starting spelling and grammar tool
Review >> Spelling and grammar - this will trigger a dialog box

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Differentiate between primary memory and secondary memory

25/12/2020

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Differentiate between primary memory and secondary memory

Primary memory holds data and instructions currently in use.  Also stores immediate results from processing waiting transfer to the output devices.

Primary memory is volatile, i.e. contents held are lost on power loss.
Random Access Memory - RAM
Random Access Memory
Secondary memory or backing storage refers to the storage of programs and data files, not currently being operated on. 

​Secondary memory is non-volatile or permanent, i.e. Contents held are not lost on power loss.

Clear differences between primary memory and secondary memory

Primary memory versus Secondary memory

Primary Memory

Secondary Memory

1. Capacity

Low storage capacity

High storage capacity

2. Storage mechanism

Volatile (loses content when power is switched off)

Non-Volatile (does not lose content when power is switched off)

3. Speed of storage/access/retrieval of information

Fast

Slow

4. Storage terms

Store data temporary unless it is a special type of ROM

Store data permanently

5. Examples

RAM and ROM

Optical Disks such as DVDs, Magnetic Disks such as HardDisk, Solid state disks such as Flash disk and Memory stick

6. Uses

Handles data currently needed by the computer

Stores data that is needed for future reference or data being transfered from one machine to another.



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State two methods of minimizing dust in a computer laboratory

25/12/2020

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State two methods of minimizing dust in a computer laboratory

  1. Regular cleaning and mopping
  2. Computer laboratory should be built while doors facing away from wind direction.
  3. Ensure proper ventilation in the computer laboratory
  4. Dry cleaning methods should be observed.
  5. Air blowing 
  6. Use a carpeted/tiled floor (gathers dust slowly and does not raise dust)
  7. Users to remove muddy shoes or clean them to ensures that no dust is carried to the room.
State two methods of minimizing dust in a computer laboratory
Students learning in the Computer Laboratory

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Name six steps in program development cycle in their logical sequence

24/12/2020

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Steps in program development cycle in their logical sequence

​Name six steps in program development cycle in their logical sequence. (3mks)
  1. Problem definition
  2. Feasibility study/ Requirement Analysis
  3. System design
  4. Programming / Program coding
  5. Testing and debugging
  6. System implementation
  7. Operation and maintenance
program development life cycle
Program development life cycle

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