Computer studies analysis of questions and answers

Name four toggle keys on a standard computer keyboard

31/12/2020

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Name four toggle keys on a standard computer keyboard

Toggle keys
Caps Lock .
Num Lock
Insert key/OVR
Scroll Lock

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Explain the following operating systems functions, Job scheduling and Interrupt handling

31/12/2020

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Explain the following operating systems functions, Job scheduling and Interrupt handling

a) Job scheduling -- where job/ tasks are assigned to the processor and main memory depending on their priority
b) Interrupt handling- halting of other processes taken by the processor so as to attend to remote enquiries or halting a processor for another task to be performed.

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Name four approaches that may be used to replace a computerized Information system

31/12/2020

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Name four approaches that may be used to replace a computerized Information system

Parallel
Pilot
Phase-in/phase out(phased stage)
Direct

(b) Which of the approaches named in (a) above is appropriate for critical systems? Explain

Parallel changeover
Reason: The system operations ai-e not interrupted prior to the changeover in terms of time and quality of production

Name four approaches that may be used to replace a computerized Information system

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Explain the following terms as used in desktop publishing, Embedded object and Auto flow

31/12/2020

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Explain the following terms as used in desktop publishing, Embedded object and Auto flow

a) Embedded object: a separate object/image/graphic/clip imported into the file permanently
b) Autoflow: Facility that allows text/cursor to flow automatically from one text box to the next when the first text is full.

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List two uses of computers in meteorology

31/12/2020

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List two uses of computers in meteorology

Vertical Divider

Uses of computers in meteorology
Data collection from the environment
Analysis of complex weather patterns
Weather forecasting

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A computer accessories vendor needs to order supplies. A spreadsheet is used to calculate the order part of which is shown below.

31/12/2020

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A computer accessories vendor needs to order supplies. A spreadsheet is used to calculate the order part of which is shown below.

(a)Write the formula that can be used in:
(i)D2
(ii)D5

(b)If a value added tax (VAT) of 16% was charged on each item and the number ordered was decreased by 10%, write a new formula that can be used in D2

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With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer

31/12/2020

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With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer

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Give a reason for each of the following

31/12/2020

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Give a reason for each of the following

(a)Changing a password regularly

To ensure that no one else / unauthorized person has access to the password/system

(b)Typing and re- typing a new password when changing it

To ensure certainty of the chosen password

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An operating system organizes files in directories as shown in the chart below.Study it and answer the questions that follow.

31/12/2020

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An operating system organizes files in directories as shown in the chart below.Study it and answer the questions that follow.

(a) (i) What is the name of this file structure?
(ii) One of the files in MISCELLANEOUS has a file name similar to one in CHEMISTRY in Form 1. Describe what happens if all the contents of CHEMISTRY are copied to MISCELLANEOUS.
(iii) What will happen if an attempt is made to delete FORM2 while File_10 in MATHEMATICS is open?
(iv) State four advantages of this structure.
(b) State four properties that an operating system displays about a file.
(c)A removable storage media unit connected to a single user microcomputer system is used for permanent storage of programs and data. State six file functions you would expect the operating system of the computer to provide to enable the user to maintain this storage media.
(d) State two tasks performed by the operating system in each of the following resources:
(i) memory;
(ii) input/output devices.

RESPONSES

(a) (i) Hierarchical Structure/Tree structure.
(ii) File 02 and 03 with be replicated in miscellaneous.

File 01 in chemistry will replace or remove file 01 in miscellaneous. Some systems may abort.

(iii) The process will be denied because the OS has file copied into the main memory.
(iv)

Easy to secure files by adding attributes.
Easy to access file/Loading of files.
Allows for grouping of similar of files.
Allows file of the same name to be stored in different folder.
Easy to add directories.

(b)File size.

Date modified.
File type.
File name.
Author.
Date created.
Time.

(c)Opening of files/Reading.

Closing of files.
Writing of files/saving/storing/print to file.
A copy commands.
Backup facility.
Delete commend/formatting.
Command to log to different part of the media.
Changing attributes.
Renaming.

(d) (i) Swapping of programs in and out of the memory.

Keep track of what part of the memory is in use.
Keep track of which process is in control of what part of memory.
Enforce a policy on how the programs can access it.
Creating of virtual memory.

(ii)It has control over their request and only grants one request access to avoid deadlocks.

Monitor and study the status of 10 and report any fault detected
Reports of error.
Controls movement of data/information in and out of the 1/O.
Allows addition of 1/O devices.

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The information below is maintained by the patron of wildlife club in a school. Study it and answer the questions that follow.

31/12/2020

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The information below is maintained by the patron of wildlife club in a school. Study it and answer the questions that follow.

(a) Describe the field values, records and file.
(b) State the most appropriate primary key for the list.
(c) State the most appropriate data type for the fields:
(i) admission number;
(ii) membership number.
(d) If a database was to be created for the list; Forms, Tables, Queries and Reports are likely to be used.
(i) State the purpose of each of these objects.
(ii) Which objects cannot be used to store the data in the list?
(e) (i) How many field values are in the list?
(ii) How many records are in the list?

EXPECTED RESPONSES

(a)The field values are the values assigned to the attributes, that is, actual names, classes.

The field value for each student constitutes a record.
The collection of all the student records is the file.

(b)Member Number.
(c) (i) Text/Number/character.
(ii) Text/Character/String/alphanumeric.
(i)

Table:-from storing the data.
Form:-data entry, editing & viewing the record.
Query:-extracting data based on some criteria.
Reports:-creating summaries for data outputs.

(ii)

Forms
Queries
Reports

(e) (i) 55
(ii) 11

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List three advantages and three disadvantages of wired communication over wireless communication.

31/12/2020

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List three advantages and three disadvantages of wired communication over wireless communication.

Advantages
Disadvantages
(b) Describe the following signals and state where each is applied in network communication:
(i) analog;
(ii) digital.
(c) Name the two types of coaxial cables,
(d) (i) Define the term network protocol.
(ii) List four internet protocols.

RESPONSES

(a) Advantages

Logic used is simple/easy to install or configure.
High speed of communication/transmission especially with optical fibre.
Not easy to tap/hack.
More secure.

Disadvantages

High cost of maintenance.
Susceptibility to vandalism
Susceptibility to EMI.
Right of way. Requirement.
Suffers high attenuation.
Hard to set up in difficult terrain.
Limited movement.

(b) (i) Analog: Continuously varying electromagnetic signal.
(ii) Digital: Pulses of electricity.
(c)

Thin coaxial/Thinnet.
Thick coaxial Thicknet.

(d) (i) Protocols are set of rules and procedures that govern communication between two different devices or people.
(ii)

TCP/IC
TCP
SMTP
FTP
IP
ATP
SPX
HTTP
Netbeui

List three advantages and three disadvantages of wired communication over wireless communication.

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Describe two ways ¡n which a computer can represent a positive number and a negative number.

31/12/2020

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Describe two ways in which a computer can represent a positive number and a negative number.

(b) A particular computer stores numbers in a single 8-bit word. How would it represent 0.3125₁₀ ?
(c) What is the decimal equivalent of the number 1.0111₂?
(d) Perform the decimal subtraction 14₁₀- 6₁₀ using
(i) regular binary;
(ii) one’s complement.

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.

Describe two ways ¡n which a computer can represent a positive number and a negative number.

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Study the flow chart below and answer the questions that follow.

31/12/2020

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Study the flow chart below and answer the questions that follow.

If DATA is the following sorted list of 13 elements, such that N 13:(where N is the number of elements in the list),1 1, 22, 30, 33, 40, 44, 55, 60, 66, 77,
80, 88, 99.
(a) Determine the output from the flowchart if ITEM is:
(1) 40
(ii) 99
(iii) 120
(iv) 5
(b) Explain the purpose of this flowchart.
(c) Write a pseudocode for the above flowchart.

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State two advantages of using robots in manufacturing of goods.

31/12/2020

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State two advantages of using robots in manufacturing of goods.

Work in hazardous environment.
Robots don't get tired.
The quality of work is consistent.
They are faster.
Less errors.
Cost effective in the long run.

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December 31st, 2020

31/12/2020

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Distinguish between the following pairs of terms

(i) Data verification and data validation
Data Validation

Consistency and integrity of data e.g. if input field is numeric then it must only receive numerals. Anything else is considered invalid

Data verification

Ensuring that data entered is the same as in the source documents

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A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.

31/12/2020

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(a) A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.

Advantages

Saves on programming effort and exposure on the part of the user (client)
The user gets a well- tried and tested program
Relatively quick implementation results from use of package

Disadvantages

Purchaser does not have full control over the packages as would have been if it was developed in house
Package is produced to meet general needs & may not be ideal for a particular customer

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Give three examples of network software

31/12/2020

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(a) Give three examples of network software

Server software
Client software
Network operating system like Linux, UNIX, Win 2000, and Win NT

fibre optic cable

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A computer specification has the following details

31/12/2020

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A computer specification has the following details:

Pentium II
1.44 MB floppy disk drive
20 GB hard disk
Full multimedia
17” SVGA monitor
Pre installed operating system
Pre- installed office suite

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Study the flowchart below and answer the questions that follow

31/12/2020

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Study the flowchart below and answer the questions that follow

(a) Write a high level language program for the above flowchart (7mks)

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Name two features of database package

31/12/2020

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Name two features of database package

Create, insert, update and delete facility
Query facility
Sorting facility
Authorization facility
Recovery control feature/ system
View mechanism

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Name two methods of paper orientation

31/12/2020

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(a) Name two methods of paper orientation (1mk)

Portrait
Landscape

(b) Name two keys used to delete text in a document (1mk)

Del
Backspace

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Distinguish between copying and moving text

31/12/2020

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Distinguish between copying and moving text

Copy
This function makes a copy of the selected text and places the copy in a new location leaving the original text in its original location
The cut function
(move) physically removes selected text from its original location & places it in a new location.

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What are the DOS commands used for the following?

31/12/2020

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What are the DOS commands used for the following?
(a) Changing directories – CD\
(b) Viewing directories – DIR
(c) Renaming directories – REN or RENAME
(d) Deleting a directory- RD\

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Give two reasons why optical disks are better storage media compared to floppy diskettes

31/12/2020

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Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

Enormous storage capacity compared to floppy diskettes
Faster access time and data transfer rates as compared to floppy diskettes
Data Recorded on optical disks is not damaged by stray magnetic fields and surface problems like fingerprints, dusts etc.

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What is an expert system

31/12/2020

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(a) What is an expert system (1mk)

A software consisting of knowledge and rules for using it gathered from human experts in a particular occupation e.g. medicine. An expert system has the capability to store the collection of knowledge & manipulate it in response to user inquiries

(b) State any two components of an expert system (2mks)

Natural language interface
A knowledge database (Where facts are stored)
An inference machine (software that solves problems and makes logical interference)
An explanation module (which explain its conclusion to the users)

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Atika School Provides Computer studies questions and answers for KCSE preparations and Computer Science for CBC.

Name four toggle keys on a standard computer keyboard

Explain the following operating systems functions, Job scheduling and Interrupt handling

Name four approaches that may be used to replace a computerized Information system

(b) Which of the approaches named in (a) above is appropriate for critical systems? Explain

Explain the following terms as used in desktop publishing, Embedded object and Auto flow

List two uses of computers in meteorology

A computer accessories vendor needs to order supplies. A spreadsheet is used to calculate the order part of which is shown below.

(a)Write the formula that can be used in: (i)D2 (ii)D5 ​

​(b)If a value added tax (VAT) of 16% was charged on each item and the number ordered was decreased by 10%, write a new formula that can be used in D2

With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer

Give a reason for each of the following

(a)Changing a password regularly

(b)Typing and re- typing a new password when changing it

An operating system organizes files in directories as shown in the chart below.Study it and answer the questions that follow.

The information below is maintained by the patron of wildlife club in a school. Study it and answer the questions that follow.

List three advantages and three disadvantages of wired communication over wireless communication.

Describe two ways in which a computer can represent a positive number and a negative number.

Study the flow chart below and answer the questions that follow.

State two advantages of using robots in manufacturing of goods.

​Distinguish between the following pairs of terms

​(a) A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.

​(a) Give three examples of network software

​A computer specification has the following details:

​(a) Write a high level language program for the above flowchart (7mks)

​Name two features of database package

​(a) Name two methods of paper orientation (1mk)

​(b) Name two keys used to delete text in a document (1mk)

​Distinguish between copying and moving text

​Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

​(a) What is an expert system (1mk)

​(b) State any two components of an expert system (2mks)

Categories

Archives

(a)Write the formula that can be used in:
(i)D2
(ii)D5

(b)If a value added tax (VAT) of 16% was charged on each item and the number ordered was decreased by 10%, write a new formula that can be used in D2

Distinguish between the following pairs of terms

(a) A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.

(a) Give three examples of network software

A computer specification has the following details:

(a) Write a high level language program for the above flowchart (7mks)

Name two features of database package

(a) Name two methods of paper orientation (1mk)

(b) Name two keys used to delete text in a document (1mk)

Distinguish between copying and moving text

Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

(a) What is an expert system (1mk)

(b) State any two components of an expert system (2mks)