Instruction to candidates
0 Comments
​FACTORS THAT DETERMINE THE TYPE OF COMPUTER TO CHOOSE1) Type of processor (Central processing unit – CPU)
Microcomputers use microprocessors, which are manufactured on a single chip, as their CPU.
​In larger computers such as supercomputers, mainframe & minicomputers, the processing is carried out by a number of separate, high-speed components instead of a single processor. 2) Processing speed.3) Amount of Main memory (RAM).
All computers have some amount of RAM (Random Access memory), which is used to hold the instructions required to perform a task.
Larger computers have more RAM and therefore can handle large volumes of data & also support many and sophisticated programs which might require large memory sizes. 4) Storage capacity of the Hard disk.
The storage capacity is the amount of space that is available for storing the instructions required to manipulate data.
Larger computers have higher storage capacities than microcomputers. 5) Cost of the computer.
​The cost of computers is directly related to the size. Microcomputers are less costly compared to minicomputers, mainframes or Supercomputers.
6) Speed of Output devices.
​The speed of an output device is determined by the amount of information that can be printed in a specified amount of time.
The speed of microcomputer output device is less than that of the larger computers in that: For a microcomputer, the speed of its output device is measured by the number of characters printed per second (cps). For larger computers, their output devices are faster and their speeds are measured depending on the number of lines or pages printed per minute (lpm / ppm). 7) Number of users who can access the computer at the same time.
​Most microcomputers can support only 1, 2 or 3 users at the same time. However, they can be networked to share resources.
Larger computers can support hundreds of users at the same time. ADVANTAGES OF COMPUTERS
Computers have many advantages over other types of office and business equipment that are used for data processing functions. Some of the advantages are:
1) Computers process data faster:
The processing speed of a computer when measured against other devices like typewriters & calculators is far much higher.
2) Computers are more accurate & reliable:
Computers produce more accurate results as long as the correct instructions & data are entered. They also have the ability to handle numbers with many decimal places.
3) Computers are more efficient:
A computer requires less effort to process data as compared to human beings or other machines.
4) Computers can quickly and effectively store & retrieve large amounts of data.
computers have the capacity to hold, retrieve and process large volumes of data when compared to other devices and humans. their memory is also expandable and faster to retrieve.
5) They are very economical when saving information, for it can conserve a lot of space.
computers makes it cheaper to save information per area required to save same information as compared to manual systems such as file cabinets. A small chip can save lots and lots of information thus saving on the cost to acquire more space.
6) Computers occupy very little office space.
computers are not bulky. they can fit in a small office, a desk, lap or palm. This attribute makes it easier and convenient while working with them
7) Computers help to reduce paper work significantly.
computers don't require paper work to manipulate and display information. ​
8) Computers are flexible:
A computer can perform a variety of jobs as long as there is a well-defined procedure.
9) Computers are cheap:
They can be used to perform a number of organizational functions/ activities, which are meant for individual persons, hence reducing the number of employees & the costs.
10) Computers enhance security & confidentiality:
Data stored in a computer can be protected from unauthorized individuals.
11) Have made communication easier.
calls, e-mailing, e-conferencing, chats and others are as a result of computers. These resources have made communication easier and faster.
12) Computers produce better information:
Computer output is usually tidy and error-free (accurate).
13) Computers reduce the problems of data or information duplication:
data duplication are now things of the past. Computers have special software packages such as DBMS- Database Management Systems that ensures the integrity, validity and correctness of data.
14) Computers can operate in risky environments,
e.g. volcanic sites, dangerous chemical plants, where human life is threatened:
DISADVANTAGES OF USING COMPUTERS.1) Computers are very costly in terms of purchase & maintenance.
computers are expensive to acquire and maintain when compared to other processing devices
2) Computers can only be used areas where there is source of power.
This is because microcomputers such as laptops and palmtops have inbuilt batteries that power them in the absence of power. These batteries automatically charge when power is connected to the computer and act as a backup in its absence.
3) Requires skilled manpower to operate, i.e., one has to have some knowledge so as to operate a computer.
This is very true. An illiterate person may not be able to operate a computer this is because computers require special skill in order to use them and these skills can be acquired in computer schools and other areas where computers are taught.
4) The records are usually kept in a form that is not visible or human-readable.
​Computer process, store and transmit information in a language that humans cannot be able understand. Thanks to binary and assembly languages. The use of machine language to program computers makes programming complicated and expensive. Data in these forms are difficult to understand and manipulate.
5) A computer, like any other machine can break down.
Just like other tools and machines, Computers can breakdown, wear and tear. They can also be destroyed easily by dust, liquids, power surge and magnetic fields.
6) Information stored in computers can easily get lost due to power interruptions or machine breakdown.
The information stored in computers can easily be lost if there are no measures to protect it such as creation of backups, installing anti-malware programs and ensuring that only regulated power enters into the computer.
7) A computer doesn’t have its own intelligence, i.e., it cannot do any useful job on its own, but can only work as per the set of instructions issued.
Computer's intelligence is limited to the instructions its is issued with. It cannot create its own intelligence to work with; however modern computers with the help of artificial intelligence can be able to learn human -like features with lots of data at place and be able to adjust and create its own intelligence systems.
8) Installation of computers causes retraining or retrenchment of staff/ employees.
Computer cause job loses, job displacement and replacement at work places this is because to do some jobs that humans can do or can't do, and they do better than humans and can't complain, they don't require salaries neither do they pay taxes. Employers prefer computers to humans in order to maximize profits.
9) The computer technology is changing very fast such that the already bought computers could be made obsolete/ out dated in the next few years.
The technology used to manufacture and run computers, hardware and software resources respectively change with times and change very fast. This calls for replacement of machines in order to enhance efficiency.
These changes leads to extra costs, training and adaptability that leads to temporary instability in work places. In addition, this rapid change in the computer technology makes computers & related facilities to become outdated very fast, hence posing a risk of capital loss. 10) Computers have led to increase in insecurity such as computer crimes especially in Banks, terrorism, social sites etc.
The computer criminals steal large amounts of funds belonging to various companies by transferring them out of their company accounts illegally. In addition, they destroy vital data used in running the companies or siphon information from firms for sale.
Use of computers to share and source information can also be a disaster especially for people who can use that information to destroy the world. Information such as 'how to acquire guns', 'how to make bombs' 'how to kill or commit suicide are not worthwhile sharing. But this information is now readily available in computers. Understanding RISC AS A TYPE OF PROCESSOR
​RISC is a type of processor which simply means
R - Reduced I - instruction S - Set C – Computer
When computers process, they require a microprocessor for the task, this microprocessor also requires instructions in order to operate.
The instructions are written in a language that only the computer can understand, basically in the form of binary and assembly languages coded in schemes such as ASCII – American Standard Code for Information Interchange and EBCDIC – Extended Binary Coded Decimal Interchange Code. 
Processor Architecture
The idea was to make microprocessor changes that were more independent of coding schemes since instructions require more equipment.
The more the instructions the slow the processing speed simply because more instructions require additional circuitry and transistors which makes the whole process complicated, difficult to setup, additional power consumption, rising of heat during processing and additional circuitry means more path links (buses).
In 1974 John Cocke of IBM Research in Yorktown, New York, originated the RISC concept by proving that about 20% of the instructions in a computer did 80% of the work. The term itself (RISC) is credited to David Patterson, a teacher at the University of California in Berkeley. The concept was used in Sun Microsystems' SPARC microprocessors and led to the founding of what is now MIPS Technologies (MIPS - millions of instructions per second), part of Silicon Graphics. A number of current microchips now use the RISC concept.
The first computer to benefit from this discovery was IBM's PC/XT in 1980. Later, IBM's RISC System/6000, made use of the idea.
Discovery of RISC led to a more thoughtful architecture of microprocessors such as how well an instruction can be mapped to the clock speed of the microprocessor this led to the improvement of microprocessor manufacture and design. ​Advantages of RISC
CategoriesJoin our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL All OUTPUT DEVICES
Output devices are those devices that play the following roles:
​EXAMPLES OF OUTPUT DEVICES
CategoriesJoin our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL All ​EXAMPLES OF COMPUTER INPUT DEVICESINTRODUCTION
Computer input devices are those devices that perform the following functions with a computer:
EXAMPLES OF INPUT DEVICES
CategoriesJoin our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL All DIFFERENCES BETWEEN DIGITAL AND ANALOGUE DATA AND COMPUTERS
CategoriesJoin our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL All DIFFERENCES BETWEEN MICRO-COMPUTERS AND MAINFRAME COMPUTERS
CategoriesJoin our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL All THE TYPES AND FUNCTIONS OF MEMORY DATA REGISTERS (MDR)INSTRUCTION REGISTER
​Instruction Register Instructions register (IR) is used to store the instruction currently being executed or decoded.
ACCUMULATOR
Accumulator or An accumulator is a register for short -term . intermediate storage of arithmetic and logic data in a computer’s CPU (central processing unit).
STORAGE REGISTER
Storage Register Holds a piece of data that is on its way to and from the CPU and the main memory.
ADDRESS REGISTER
The Memory Address Register (MAR) is a CPU register that either stores the memory address from which data will be fetched to the CPU or the address to which data will be sent and stored.
CategoriesJoin our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL All DIFFERENCES BETWEEN HARD COPY AND SOFT COPY OUTPUT DEVICESOutput from the computer can normally be in several forms. Give the difference between the following methods.(2Marks)
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
#
|
SOFTCOPY
|
HARDCOPY
|
|
1
|
it is intangible
|
it is tangible
|
|
2
|
it is flexible in editing
|
cannot be easily edited
|
|
3
|
​does not require stationery
|
requires stationery
|
|
4
|
they are cheap to produce
|
they are expensive to produce
|
|
5
|
easily transmissible
|
​difficult to distribute
|
|
6
|
requires electrical signals to use
|
after printing does not require electrical signals
|
|
7
|
has no mass
|
has mass
|
Categories
Join our Whatsapp Notifications and Newsletterstouch here COURTESY OF ATIKA SCHOOL
All
1998
1998 KCSE
1999
APPLICATIONS AREAS OF ICT
Career Opportunities In ICT
COMPUTER SYSTEMS
DATABASE
DATA PROCESSING
DATA SECURITY AND CONTROLS
ELEMENTARY PROGRAMMING PRINCIPLES
FIELD
FILE
FORM 1
FORM 2
FORM 3
FORM 4
IMPACT OF I.C.T ON SOCIETY
INTRODUCTION TO COMPUTERS
INTRODUCTION TO NETWORKING AND DATA COMMUNICATION
KCSE 2018
KCSE QUESTIONS 1998
KCSE QUESTIONS 2007
MIND BLOWING Q & A
MOCKS
Operating System
OPERATING SYSTEMS
OUTPUT DEVICES
PROGRAM DESIGN
RECORD
REVISION KITS
SPREADSHEET
SPREADSHEETS
STORAGE DEVICES
SYSTEM DESIGN
THE COMPUTER LABORATORY
WORD PROCESSORS
​FREE KCSE PAST PAPERS 2018: COMPUTER STUDIES FORM 1 QUESTIONS AND ANSWERS
This category comprises of KCSE 2018 computer studies questions and answers for form that featured in that year.
Question 1
Topic: Introduction to computers (Classification of Computers)
State two reasons for the increased use of laptop computers in government offices. (2 marks)
- They are small and fit in a small storage space.
- They are light weight hence can be carried to areas where their services are required.
- The monitor, system unit, keyboard units are attached together hence making its use to be convenient.
- Rechargeable / backup battery.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the two correct answers regardless of the arrangement scored 2 marks.
Question 2
Computer network technicians prefer to use command-line based operating system when configuring networks. State three reasons for the preference. (3 marks)
Topic: The Operating System (HCI - Human Computer Interface)
- ​They do not take up a lot of memory hence boot faster than the GUI OS.
- They have direct access or most hardware devices.
- They are cheaper to acquire as some can be downloaded free of charge.
- They can run on lower —bit hardware systems such as 32-bit computers.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the three correct answers regardless of the arrangement scored 3 marks.
Question 3
State three measures that should be put in place in a computer laboratory to safeguard users’ health. (3 marks)
Topic: Introduction to Computers (The Computer Laboratory)
- All power cables must be insulated and hidden from users.
- The furniture used must be of standard computer furniture.
- The room should be lit with adequate lighting.
- The room must be ventilated.
- Computer monitor should be fitted with antiglare to filter excess light rays emanating from the monitor.
- Avoid slippery floors/cemented floors.
- Controlling dust.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the three correct answers regardless of the arrangement scored 3 marks.
Question 4
State three ways in which barcode readers may be used in schools. (3 marks)
Topic: The Computer System (Hardware/Input Devices)
- To take inventory of items in the school.
- To keep track of employee login log out.
- Used to transact business in the library.
- Used to keep track of movement of goods.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the three correct answers regardless of the arrangement scored 3 marks.
Question 5
State three advantage of flat panel monitors over cathode ray tube monitors as used in computers. (3 marks)
Topic: The Computer System (Hardware/Output Devices)
- They are compact and light weight;
- They consume less power;
- They do not suffer from geometrical distortions;
- They do not cause eye fatigue.
- They support many advanced technologies;
- They can be made in almost any size and shape;
- They support higher resolution.
- Low heat radiation.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the three correct answers regardless of the arrangement scored 3 marks.
Question 6
State three possible reasons for the extinction of daisy wheel printers in the market. (3 marks)
Topic: The Computer System (Hardware/Output Devices)
- ​They supported one font size and font face;
- They were monochrome printers;
- They produced noise while printing;
- They were very slow;
- Did not print graphics.
- Had poor print quality.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the three correct answers regardless of the arrangement scored 3 marks.
Question 7
State three ways in which an operating system secures a computer system. (3 mark)
Topic: The Operating System (Functions of the Operating System)
- Access controls: Authentication of users in order to access files;
- Performing regular patches of updates;
- Creating secure accounts with required privileges;
- Scrutinizing all incoming and outgoing packets of data through a firewall;
- Encryption of data, during the transmission stage;
- Password / biometric analysis;
- Log files to detect any breach.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the three correct answers regardless of the arrangement scored 3 marks.
Question 8
A law firm prefers to use hard copy output over soft copy output when handling documents for legal matters. State two reasons for this preference. (2 marks)
Topic: The Computer System (Hardware/Output Devices)
- ​They are acceptable as exhibit in cases of litigation.
- Can be used without a computer.
- They are difficult to change without leaving any trace.
- They can be used without power.
- They can be used without the experience of computer usage.
Marking Tips:
- Any of these or correct answer had 1 mark each.
- Any of the two correct answers regardless of the arrangement scored 2 marks.
Question 11
Distinguish between real-time operating system and distributed operating system. (3 marks)
Topic: The Operating System (Types of the Operating System) also check relevance in form 3 under Data processing (electronic data processing modes)
- Real-time OS reads information from input devices and must respond within a short duration of time to ensure correct performance.
- Distributed OS distributes computation among several physical processors which do not share memory or clock.
Marking Tips:
- Three marks for clear differences between real-time and distributed OS
Analysis of form 1 questions in kcse 2018 computer studies paper 1
Weight of form 1 marks vs total marks in KCSE 2018 computer studies paper 1
- 25 marks were carried from form 1 representing 25% of all paper 1 marks
How marks were distributed across all form 1 topics
There are only three topics in form 1. Namely:
- Introduction to Computers - 5 marks
- The Computer System - 11 marks
- The Operating System - 9 marks
Advice to Users
Put more emphasis on those topics that carried bulky marks especially I/O devices under the computer system topic.
INTRODUCTION TO COMPUTERS: MIND BLOWING QUESTIONS AND ANSWERS
As you study computer studies, under introduction to computers topic, definition and parts of a computer sub-topic, seek to answer the following questions.
- What is a computer?
- Define the terms:
- data
- information
- Differentiate between data and information.
- Explain why a phrase such as '1980' is data and not classified as information.
- Draw a well labelled diagram to illustrate information processing cycle.
- State the three functions of a computer.
- What is the major purpose of a computer?
- State advantages and disadvantages of computers.
- State six computer features that makes them smarter than humans.
- State five similarities between computers and humans.
- State five differences between humans and computers.
- Describe the four major parts of a computer.
- Why is a computer described as:
- electronic device;
- processing device
- programmable
- Why is a computer chassis also referred to as the system Unit?
- State the importance of a monitor in computer operations and why it is referred to as the video display unit (VDU).
- What is a computer program?
- What are peripheral devices?
- List any six peripheral devices.
- Differentiate between the CPU and the System Unit.
- List six components housed inside the computer chassis.
- Using a well illustrated diagram, explain how a computer operates.
- Why do we study computer studies?
- State the difference between a desktop system unit and a tower system unit.
-
- Other than a desktop and a laptop, state any other six devices that can be described as a computer.
- What features/characteristics made you classify those devices (above) as computers.
- Other than a desktop and a laptop, state any other six devices that can be described as a computer.
- Write the following acronyms in full and describe what they are:
- VDU
- ICT
- PC
- CPU
- µP
JUNE 2019, FORM 1 COMPUTER STUDIES MIND BLOWING QUESTIONS AND ANSWERS
​1. Write the following acronyms in full
- OBR -
Optical Barcode Reader - OCR -
Optical Character Recognition - OMR -
Optical Mark Recognition - MICR -
Magnetic Ink Character Recognition - MRI -
Magnetic Resonance Imaging
​2. State advantages of the keyboard over a mouse
- Keyboard can input text data, a mouse cannot.
- A keyboard can operate a computer without a mouse but a mouse cannot fully operate the computer without a keyboard.
- A keyboard can work on a multiple operating system such as command line interface, while a mouse only works on graphical user interface and menu driven interface.
- A keyboard has more operating and input features as compared to a mouse these features include function keys, special PC operation keys, data movement and editing keys and alphanumeric and numeric keypad keys. These features almost does everything to accomplish a task with a computer. While a mouse can only input instructions/commands.
3. Which input devices is recommended for use by blind people.
- Braille keyboard
- Voice input
- Smart gloves (turning sign language to text)
​4. Distinguish between magnetic and optical scanners
​Magnetic scanners capture data using magnetic technology, while optical scanners capture data using a directed beam of light.
5. State two advantages of using a light pen over other input devices
- With a light pen, digital signatures are possible.
- It is easier to make drawings with light pen than other input devices.
​6. State 3 factors to consider when purchasing/selecting input devices.
- ​What the device is intended for
what are you intending to use this device for? - Bulkiness of the device / portability / stationery
this is how big or small the machine is and if it can be carried from one place to another for use or not - Amount of work to be handled
bulky work needs faster machines - Type of input data
it can be text, voice, instruction, sign language etc. - Initial Cost
the cost of buying the input device - Maintenance cost
this is the cost at which the buyer incur after the machine malfunction - Warranty / documentation
agreement between the buyer and seller on terms of after sale service and prove of purchase - User-friendliness
the interaction with users should be easy and friendly - User ability / disability
there are users with disability such as blind,crippled or dumb - Quality of input device
e.g. water proof, coating materials that can guarantee durability, power consumption etc. - The speed at which the input device captures data
this is the frequency at which it captures over a given duration of time. Input devices such as scanners are faster than keyboard and more accurate. - Hardware / software compatibility
ability for its software to work with other available software packages - Upgradability
capability of being improved in functionality by the addition or replacement of components or software. - Interface / connectivity
The type of interface used for connectivity should be available for your computer hardware. In most cases, USB and HDMI interface is used. - Versatility
This is the ability of a machine to adapt to other functions other than input data. The functions may include printing and photocopying.
DEFINE THE FOLLOWING TERMS; 1)FILE; 2) RECORD; 3) FIELD
A file, record and a field are database terms used especially when dealing with tables.
What is a file
A file is a collection of records, database files organize the data into records and fields.
Further definition of a file;
- ​A file is an object on a computer that stores data, information, settings, or commands used with a computer program.
- A file can be defined as a collection of related records that give a complete set of information about a certain item or entity.
- A file is the common storage unit in a computer, and all programs and data are "written" into a file and "read" from a file.
- A file is a container in a computer system for storing information.
What is a record?
DATABASE TABLE
A record is a collection of related fields that represent a single entity
What is a field?
A field is a character or a logical combination of characters that represent a single data item.
Related resources;
GIVE TWO TYPES OF STORAGE DEVICES USED IN A COMPUTER GIVING AN EXAMPLE OF EACH.
INTRODUCTION;
There are various categories under which storage devices can be classified;
- The duration they store information;
- Mobility and;
- How they function.
HARD DISK DRIVE
a) CLASSIFICATION OF STORAGE DEVICES BASED ON THE DURATION OF TIME THEY STORE INFORMATION.
Storage devices in this category can either be;
- Secondary storage devices
- Primary storage devices
1. secondary storage devices
|
2. primary storage devices
|
b) classification of storage devices based on mobility.
Storage devices can also be categorized according to mobility. I.e.
- Fixed storage devices and;
- Portable storage devices
1. fixed storage devices
2. portable storage devices
|
c) classification of storage device on how they function.
Storage devices functions in different ways depending on the technology used to manufacture each one of them. They include;
- ​Solid state storage device
- Magnetic storage device
- optical storage devices
1. solid state storage devices
2. optical storage devices
3. magnetic storage devices
|
More questions on;
Categories
All
1998
1998 KCSE
1999
2020
APPLICATIONS AREAS OF ICT
Career Opportunities In ICT
CLASSIFICATION OF COMPUTERS
COMPUTER SYSTEMS
DATABASE
DATA PROCESSING
DATA SECURITY AND CONTROLS
ELEMENTARY PROGRAMMING PRINCIPLES
FIELD
FILE
FORM 1
FORM 2
FORM 3
FORM 4
IMPACT OF I.C.T ON SOCIETY
INPUT DEVICES
INTRODUCTION TO COMPUTERS
INTRODUCTION TO NETWORKING AND DATA COMMUNICATION
KCSE 2018
KCSE QUESTIONS 1998
KCSE QUESTIONS 2007
MID-TERM EXAMS
MIND BLOWING Q & A
MOCKS
Operating System
OPERATING SYSTEMS
OUTPUT DEVICES
PROCESSING DEVICES
PROCESSORS
PROGRAM DESIGN
RECORD
REGISTERS
REVISION KITS
SPREADSHEET
SPREADSHEETS
STORAGE DEVICES
SYSTEM DESIGN
TERM 1
THE COMPUTER LABORATORY
WORD PROCESSORS
Archives
February 2020
January 2020
October 2019
August 2019
July 2019
May 2019
April 2019
March 2019
November 2018
August 2018
July 2018
December 2017
November 2017
October 2017
July 2017
May 2017
August 2016
June 2016
January 2016
December 2015
November 2015
RSS Feed