Computer studies analysis of questions and answers

State the functions of each of the following keys on the computer keyboard:

12/1/2021

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State the functions of each of the following keys on the computer keyboard:

(a) backspace;

moves the display cursor one position backwards, deletes the character at that position, and shifts back the text after that position by one position

(b)insert (ins)

When insert is selected, keys add characters to the screen at the cursor (insertion point) without deleting those already there. When typeover is selected the new characters type over the old, deleting them as they go

State the functions of each of the following keys on the computer keyboard:

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State three circumstances under which voice input would be preferred over other methods of data capture.

8/1/2021

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State three circumstances under which voice input would be preferred over other methods of data capture.

Circumstance for voice input

When the hands of the user are engaged;
When the user has physical disabilities;
When faster input is required;
When the user is not good in keying skills.

State three circumstances under which voice input would be preferred over other methods of data capture.

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State three benefits of using optical magnetic reader to register candidates for an examination.

8/1/2021

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State three benefits of using optical magnetic reader to register candidates for an examination.

Benefits of using OMR

Helps in minimizing human errors during data input/has high accuracy;
It hastens capturing of candidates data /is faster;
Cheaper, since it reduces the need for human intervention;
Can be used for bulk processing.

State three benefits of using optical magnetic reader to register candidates for an examination.

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List four devices that use scanning technology that would be used to capture data directly from the source.

7/1/2021

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List four devices that use scanning technology that would be used to capture data directly from the source.

Direct input methods

OBR
MICR
OCR;
OMR:
Image scanner;
Magnetic strip technology;
Image recognition/ face recognition/finger print.

List four devices that use scanning technology that would be used to capture data directly from the source.

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Explain three features of a graphical user interface as used in computers.

7/1/2021

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A) Explain three features of a graphical user interface as used in computers. (6 marks)

Windows — a rectangular area on the screen where the commonly use application run.
Icons — A picture or symbol which is used to represent a software application or hardware device.
Menus —a list of options from which the user can choose what that they require.
Pointer - a symbol such as arrow which moves around the screen as the user move the mouse.

B) State the function of each of the following computer keyboard keys:

(i) Caps Lock (1 mark)
(ii) Shift (1 mark)
(iii) Home (1 mark)

(i) Function of Caps lock
- It’s a toggle key when ON, the characters typed are in uppercase when OFF, the characters typed are in lower case.
(ii) Shift key
- Used to enable uppercase letter to be printed when alphanumeric keys are pressed.
- Used with other keys to modify behavior/function key.
(iii) Home key
- Used to take the cursor to the beginning of the line in a word processor.
- Evidence of movement of the cursor.

C) Using two complement notation, determine the value of the operation 25₁₀ — 29₁₀ (6 marks)

C) Using two complement notation, determine the value of the operation 25 -- 29 (6 marks)

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State four factors to consider when selecting an input device for use in a computer room.

7/1/2021

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State four factors to consider when selecting an input device for use in a computer room. (4 marks)

1. user needs

this is the urgency of use of the device in the computer room by users also whether it will satisfy the needs of the user.

2. Initial cost

the amount it can cost when buying/purchasing the devices

3. Maintenance cost

the amount that can be used to maintain the servicing of these devises should be considered

4. Mode of transmission

how will you transport them to the computer room should be considered

5. Amount of space it occupies

the size of the room to be used in setting the computer room and the devices should be considered if it adequate

6. Compatibility with available hardware

will the devices fit to other devices in the room already

7. User- Friendliness

whether the devices will be used to solve problems and easy to be used by users

State four factors to consider when selecting an input device for use in a computer room.

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Explain the term toggle key as used in computer keyboard.

7/1/2021

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(a) Explain the term toggle key as used in computer keyboard. (2 marks)

These are keys that alternate the input mode. When pressed ON they are intended to perform a task, when OFF, they perform different task.

(b) List examples of toggle keys on a computer keyboard. (2 marks)

Example of toggle keys:
Caps lock, Insert, Num Lock and Scroll lock.

Explain the term toggle key as used in computer keyboard.

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State three ways in which barcode readers may be used in schools

4/1/2021

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State three ways in which barcode readers may be used in schools. (3 marks)

Ways in which barcode readers can be used in a school.

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.

Barcode

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Name and explain the function of the keyboard keys represented by the following symbols

2/1/2021

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(a) Name and explain the function of the keyboard keys represented by the following symbols (2mks)

(i) Tab Key Used to remove text/ cursor to the right by a fixed or present number of spaces

(ii) Enter / carriage Return key Used to initiate command on the screen i.e. Pressed after each command.

(iii) Shift Key Used to change letter case. Also used in conjunction with other keys for various Commands.

(b) Simulation is one of the application areas of computers

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A school has brought a computer system. The hardware items include: 800 MHz processor, 640 MB of RAM, a sound card, speakers, a monitor, a keyboard, a 12 GB hard disk, a floppy disk drive, CDRW drive, a mouse, a modem, an inkjet printer and a joy

1/1/2021

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A school has brought a computer system. The hardware items include: 800 MHz processor, 640 MB of RAM, a sound card, speakers, a monitor, a keyboard, a 12 GB hard disk, a floppy disk drive, CDRW drive, a mouse, a modem, an inkjet printer and a joystick. The software supplied includes: an OS, a BASIC interpreter and the following packages: Spreadsheets, graphic, word processor, art database and games.

(a) List three input devices from the given specifications

Keyboard
Mouse
Joystick

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Computer systems are built from three types of physical components: processors, memories and I/O Devices.

31/12/2020

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(a) State two tasks of a processor (2mks)

To control the use of main memory to store data & instructions
To control sequence of operations
To give instructions to all parts of the computer system
To carry out processing

(b) State the functions of I/O devices

Input
Used to enter data into the computer in a form the computer can store & process e.g. keyboard, mouse.
Output
Used to display the results of processing e.g. printer, monitor

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Distinguish between the following: CRT and LCD, OCR and OMR.

30/12/2020

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Distinguish between the following:CRT and LCD, OCR and OMR.

(a) CRT :- A display unit built around the vacuum tube containing one or more electron guns whose electron beams rapidly sweep horizontally across the inside of the front surface of the tube which is coated with a material that glows when irradiated. WHILE
LCD : - A type of display that uses a liquid compound having a polar molecular structure. sandwiched between two transparent electrodes. When an electric field is applied, the molecules
align with the field forming a crystalline arrangement that polarizes the light passing through it. A polarized filter laminated over the electrodes locks polarized light. In this way, a grid of electrodes
can selectively tum on” a cell,, or a pixel, containing the liquid crystal material turning it dark.
(b) OCR :- Type of scanning technology that reads special pre-printed characters and converts then into computer usable form, while
OMR :-Scanning technology that reads pencil marks and converts them into computer usable form.

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Describe an input device.

30/12/2020

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Describe an input device.

(b) Other than scanning devices, name two other input devices.

(a) A device that takes raw data and converts it into computer processable form or hardware used to get data into a computer. (1 mark)

(b)

Keyboard
Mouse
Joystick
Pointing devices
Keying devices

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Explain the following input/ output terms as used in computer systems. Give an example for each

30/12/2020

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Explain the following input/ output terms as used in computer systems. Give an example for each (4mks)

(a) Read- get data from memory e.g. opening a file
(b) Write – put data into memory e.g. saving

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Describe the functions of the following computer hardware components: Mouse and Scanner

27/12/2020

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Describe the functions of the following computer hardware components:

computer mouse

Mouse

This is an input device that works in conjunction with a pointer on the screen. It is used for selecting and other input functions.

flatbed scanner

Scanner

This is an input device that captures text and images directly into the computer by the use of light, magnetism or electrical signals.

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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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What are peripheral devices?

22/12/2020

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what are peripheral devices?

Any device connected externally to the CPU
A peripheral device is an internal or external device that connects directly to a computer or other digital device but does not contribute to the computer's primary function, such as computing.
It helps end users access and use the functionalities of a computer.-Techopedia

Give two examples of peripheral devices

Mouse,
Monitor,
Keyboard,
printer

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EXAMPLES OF COMPUTER INPUT DEVICES

17/10/2019

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EXAMPLES OF COMPUTER INPUT DEVICES

INTRODUCTION

Computer input devices are those devices that perform the following functions with a computer:

enter data into the computer;
convert data from human readable form to computer readable form also called binary language;
act as a communication link between the computer user and the computer. A platform the user utilizes to communicate with the computer

EXAMPLES OF INPUT DEVICES

Examples of input devices

Without going further into categories, input devices are as follows:

keyboard;
mouse;
trackball;
joy stick
scanners;
digitizers;
digital camera
touch screen/pad
light pen
stylus
voice input/microphone
tablets;
remote controls;
gamepad;
whiteboard;
webcam
Punch card readers and;
disk drives

State the functions of each of the following keys on the computer keyboard:

State three circumstances under which voice input would be preferred over other methods of data capture.

State three benefits of using optical magnetic reader to register candidates for an examination.

List four devices that use scanning technology that would be used to capture data directly from the source.

​A) Explain three features of a graphical user interface as used in computers. (6 marks)

B) ​State the function of each of the following computer keyboard keys:

C) Using two complement notation, determine the value of the operation 2510 — 2910 (6 marks)

​State four factors to consider when selecting an input device for use in a computer room. (4 marks)

1. user needs

2. Initial cost

3. Maintenance cost

4. Mode of transmission

5. Amount of space it occupies

6. Compatibility with available hardware

7. User- Friendliness

​(a) Explain the term toggle key as used in computer keyboard. (2 marks)

(b) List examples of toggle keys on a computer keyboard. (2 marks)

​​State three ways in which barcode readers may be used in schools. (3 marks)

​(a) Name and explain the function of the keyboard keys represented by the following symbols (2mks)

(b) Simulation is one of the application areas of computers

​(a) List three input devices from the given specifications

​(a) State two tasks of a processor (2mks)

​(b) State the functions of I/O devices

Distinguish between the following:CRT and LCD, OCR and OMR.

Describe an input device.

​Explain the following input/ output terms as used in computer systems. Give an example for each (4mks)

Describe the functions of the following computer hardware components:

Mouse

Scanner

​Magnetic Ink character Recognition (MICR)

Scanner

Definition

Technology

Uses

what are peripheral devices?

​EXAMPLES OF COMPUTER INPUT DEVICES

INTRODUCTION

EXAMPLES OF INPUT DEVICES

Categories

Categories

Archives

A) Explain three features of a graphical user interface as used in computers. (6 marks)

B) State the function of each of the following computer keyboard keys:

C) Using two complement notation, determine the value of the operation 25₁₀ — 29₁₀ (6 marks)

State four factors to consider when selecting an input device for use in a computer room. (4 marks)

(a) Explain the term toggle key as used in computer keyboard. (2 marks)

State three ways in which barcode readers may be used in schools. (3 marks)

(a) Name and explain the function of the keyboard keys represented by the following symbols (2mks)

(a) List three input devices from the given specifications

(a) State two tasks of a processor (2mks)

(b) State the functions of I/O devices

Explain the following input/ output terms as used in computer systems. Give an example for each (4mks)

Magnetic Ink character Recognition (MICR)

EXAMPLES OF COMPUTER INPUT DEVICES