Computer studies analysis of questions and answers

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

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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.

(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)

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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 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:

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

To locate a particular word or character or text
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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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

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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

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.

Expected response

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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

Magnetic Ink character Recognition (MICR) (2 mks)
Optical Mark Read (OMR) (2mks)

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

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

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

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)

Problem definition
Feasibility study/ Requirement Analysis
System design
Programming / Program coding
Testing and debugging
System implementation
Operation and maintenance

Program development life cycle

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State three advantages of computer networking

24/12/2020

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Advantages of computer networking

Reasons why computer networks are important:

Networking enables computers to share resources like hard disks, memory, CD drives, files, printers, among others.
Networks enable more efficient, cost effective, flexible and customized remote communication instantly over long distances.
Computer networks enable distributed processing ability, that is, combining of their processing power to share tasks.
Networks reduce the cost of hardware and software purchase because these resources can be shared in a network instead of buying individual copies for each computer.
Networks provide more reliability. If one computer fails, another one in the network can be used to access files and other resources held in centralized servers.
Stored risk and mutual support.

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Suggest how computers may in future be made more users friendly for persons that are blind and without hands

24/12/2020

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Suggest how computers may in future be made more users friendly for persons that are:

Blind

Voice - to - Text

Computers that respond to touch and sound (voice)/Braille keyboard

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Define the term array as used in computer programming

24/12/2020

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Define the term array as used in computer programming (2mks)

An array is a structure, which holds many variables, all of the same data type.

The array consists of so may element, each element of the array capable of storing one piece of data (variable)

An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

What are the applications of array?

Used in mathematical problems like matrices etc.
They are used in the implementation of other data structures like linked lists etc.
Database records are usually implemented as arrays.
Used in lookup tables by computer.

Simple syntax to create an array in C programming

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Write the abbreviations BCD, ASCII AND EBCDIC in full

24/12/2020

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Write the following abbreviations in full. (3mks)

BCD
ASCII
EBCDIC

Write the abbreviations BCD, ASCII AND EBCDIC in full

IBM 595 MINI COMPUTER

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

(a) What are computer viruses?

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

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

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

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

​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:

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

Use of the search/find and replace feature

Quick Response

Detailed Response

List of file organization methods in a computer

Creating

Differences between system software and application software

System Software

​Magnetic Ink character Recognition (MICR)

Scanner

Definition

Technology

Uses

Step 1: Start spelling and grammar tool

Differentiate between primary memory and secondary memory

Clear differences between primary memory and secondary memory

Primary Memory

Secondary Memory

1. Capacity

2. Storage mechanism

3. Speed of storage/access/retrieval of information

4. Storage terms

5. Examples

6. Uses

State two methods of minimizing dust in a computer laboratory

Steps in program development cycle in their logical sequence

Advantages of computer networking

Blind

​Define the term array as used in computer programming (2mks)

Categories

Archives

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

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

What is meant by data communication in a computer network?

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:

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

Magnetic Ink character Recognition (MICR)

Define the term array as used in computer programming (2mks)