Computer studies analysis of questions and answers

They have battery that powers the devices hence can be used when where is no power.
They can be used anywhere because they are light.
They require less space.
Technology must be qualifìed.

State two advantages of using portable computers.

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State two circumstances under which warm booting of a computer may be necessary.

7/1/2021

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State two circumstances under which warm booting of a computer may be necessary.

Reasons for warm booting a computer

when computer hangs
when a program encounters an error
during the installation of new software for the installation to be complete
during the installation of hardware so that the drivers can be activated.

State two circumstances under which warm booting of a computer may be necessary.

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Differentiate between analogue data and digital data as used in computers.

7/1/2021

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Differentiate between analogue data and digital data as used in computers. (2 marks)

Analogue data Uses values that change continuously between to instances while Digital data are values that change from one value to the next in a step by step sequence.

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State three functions of Un-uninterruptible Power Supply (UPS)

7/1/2021

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State three functions of Un-uninterruptible Power Supply (UPS). (3 marks)

Functions of the UPS

It regulates power from an unstable power source to the required clean stable voltage.
It prevents power surges and brownouts that might destroy the computer.
It temporarily provides power to the computer in case of the main power failure. This allows the user to save his/her work and shutdown the computer using the correct procedure.
Alerts the user of any power loss (by beeping).

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Explain two health issues that could arise from the use of an unsuitable computer desk.

6/1/2021

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Explain two health issues that could arise from the use of an unsuitable computer desk.

Problems arising from use of unsuitable computer desk.
It could lead to back problems if the desk is of an unrealistic height.
If it does not provide good positioning of the monitor, it could result in eye strain.
Wrist problems will arise if the keyboard and mouse seating positions are bad.
Injury as a result of falling computer components due to weak computer desks/ small size.

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State two reasons for the increased use of laptop computers in government offices

4/1/2021

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State two reasons for the increased use of laptop computers in government offices. (2 marks)

Reasons for the preference for laptops.

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.

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State four characteristics which make computers better than human beings.

3/1/2021

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State four characteristics which make computers better than human beings.

Computers can be automated or programmed.
Computers are fast.
Computers are capable of performing repetitive tasks.
Computers can store a lot of information.
Computers are accurate.
Can do dangerous tasks.
Give quality output.
Diligence /don’t get tired/sick.

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State two reasons why it is necessary to use standard furniture in a computer laboratory.

3/1/2021

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State two reasons why it is necessary to use standard furniture in a computer laboratory.

Prevents people from straining. .
Table sizes allow all equipment to fit.
Optimization/utilization of room space.

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A computer teacher put a rule that diskettes should not be used in the computer laboratory

1/1/2021

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A computer teacher put a rule that diskettes should not be used in the computer laboratory

(a) Give a reason for the rule

Introduction of viruses and other bugs from the diskettes

(b) State two other alternatives that can be used to achieve the same objective

By disabling the diskette drive
Having up to date antivirus software that will defect and eradicate any virus in the diskette.

The computer laboratory

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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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Threats to the safety of computer systems take many forms such as: White- collar crime, natural, disasters, vandalism and carelessness.

31/12/2020

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Threats to the safety of computer systems take many forms such as: White- collar crime, natural, disasters, vandalism and carelessness.

Give one way as to how each of these forms of threats can be controlled

White Collar Crime
Enforce personnel security e.g.
- No one person should be wholly responsible as system administer
- Introduce computer audit trails
- No one person should be in one department for a long time. Purge employees
Natural Disasters
- Floods, computers rooms should not be installed in basements
- Lightening, Use UPS, surge protectors and the like (have backups that are well kept safely away from the computers site, have a contingency plan).
Vandalism
- Enforce personnel security e.g. restrict building access
- Secure computer systems to desks, reinforce doors, windows
- Introduce alarm system, CCTV systems
Carelessness
- Avoid food, drinks into the lab
- Have backups incase of unintended delete operations
- Have undelete utilities

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Describe each of the following types of computers: hybrid; and embedded.

31/12/2020

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Describe each of the following types of computers: hybrid; and embedded.

(a) Hybrid -computer is one that has both analogue and digital features.
(b) Embedded -computer is one that is within some other device such as domestic appliances, petrol pumps etc. A computer attached to another machine.

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What is a computer keyboard?

30/12/2020

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(a) (i) What is a computer keyboard? (1mk)

Input device with keys for keying in data in the form of characters

List four types of keys found on a computer keyboard. Give an example of each. (4mks)

Alphanumeric
Function
Numeric key pad
Special character
Cursor control

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List five precautions that can be taken to protect data stored in diskettes

30/12/2020

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(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

Avoid keeping in places of high temperatures
Avoid folding/ crushing/ dropping/ (any physical damage)
Avoid bringing close to magnet/ electrical fields
Keep in disk bank
Write protect
Keep away from dust
Do not remove while the disk drive is active
Install an up to date antivirus

diskettes

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List three differences between a microcomputer and a super computer

30/12/2020

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List three differences between a microcomputer and a super computer (3mks)

Microcomputers

Small in size
Low speed compared to Supercomputers
Intended for use at home or Offices
Low cost compared to supercomputers

Supercomputers

Huge in size
Fast processing capacity
Mainly used in scientific and application engineering application e.g. Like weather forecasting
Very expensive

supercomputer

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State four benefits of using a computer in a school library

29/12/2020

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State four benefits of using a computer in a school library

Record keeping made easier e.g. easy to track borrowers and books
Easy to search for library materials.
Books and other materials can be held electronically hence allowing multimedia usage.
Library materials can be electronically marked thus minimizing loses and theft.

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State the functions of the following keys on the computer keyboard; Backspace and Insert (ins)

29/12/2020

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State the functions of the following keys on the computer keyboard; Backspace and Insert (ins)

Backspace – to delete a character to the left of the cursor
Insert (ins) – when the key is depressed editing is in overtype mode. Any new text typed in the middle of a line is inserted between existing text while the existing text disappears/is deleted.

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Describe the computer booting process.

29/12/2020

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Describe the computer booting process.

The internal power supply turns on and initializes.
The BIOS performs the power-on self test (POST). If there are any fatal errors, the boot process stops
The BIOS the looks for other devices’ ROMS to see if any of them have BIOSEs. Normally, the IDE/Ata hard disk BIOs will be found and executed. If any other device BIOSes are found, they are executed as well
The BIOS begins the search for a drive to boot from
Having identified its target boot drive, the BIOS looks for boot information to start the operating system boot process

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State two ways in which a computer may be used in efficient running of a hospital

29/12/2020

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State two ways in which a computer may be used in efficient running of a hospital (2mks)

storing patient records
Monitoring patients e.g. babies in incubators, ICUs etc
Diagnosis, data from sensors attached to the patient can be fed into a computer e.g. in heart ailments, CAT and MRI scans
Medical training e.g. using simulations software to show how a body part works

ICU

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Explain how each of the following would affect the suitability of a room for use as a computer room. (2mks)

29/12/2020

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Explain how each of the following would affect the suitability of a room for use as a computer room. (2mks)

(a) Burglar proofed door

enhances the security system as it prevents Unauthorized users from entering

(b) Availability of taps and sinks in the room

Could be detrimental since water can cause damage to computer equipment

The computer laboratory

Why is it necessary to have a UPS in a computer laboratory?

27/12/2020

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Functions of the UPS

Uninterruptible Power Supply

To regulate/limits amount a voltage entering computer equipment.
To supply equipment with power temporarily while normal power is not available.
Alerts the user when main power is switched off.

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State three features of fifth generation computers.

Headache, back and neck pain may result from the use of computers.

​State the hardware technological differences between the second generation and the third generation computers. (2 marks)

Second Generation Computers

Third generation computers

​State two ways of ensuring proper ventilation in a computer room. (2 marks)

State two advantages of using portable computers.

State two circumstances under which warm booting of a computer may be necessary.

​Differentiate between analogue data and digital data as used in computers. (2 marks)

​State three functions of Un-uninterruptible Power Supply (UPS). (3 marks)

​​Functions of the UPS

Explain two health issues that could arise from the use of an unsuitable computer desk.

​State two reasons for the increased use of laptop computers in government offices. (2 marks)

State four characteristics which make computers better than human beings.

State two reasons why it is necessary to use standard furniture in a computer laboratory.

​A computer teacher put a rule that diskettes should not be used in the computer laboratory

Name four toggle keys on a standard computer keyboard

Threats to the safety of computer systems take many forms such as: White- collar crime, natural, disasters, vandalism and carelessness.

​Give one way as to how each of these forms of threats can be controlled

Describe each of the following types of computers: hybrid; and embedded.

​(a) (i) What is a computer keyboard? (1mk)

​List four types of keys found on a computer keyboard. Give an example of each. (4mks)

​(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

​List three differences between a microcomputer and a super computer (3mks)

​Microcomputers

​Supercomputers

State four benefits of using a computer in a school library

State the functions of the following keys on the computer keyboard; Backspace and Insert (ins)

Describe the computer booting process.

​State two ways in which a computer may be used in efficient running of a hospital (2mks)

​Explain how each of the following would affect the suitability of a room for use as a computer room. (2mks)

(a) Burglar proofed door

(b) Availability of taps and sinks in the room

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State the hardware technological differences between the second generation and the third generation computers. (2 marks)

State two ways of ensuring proper ventilation in a computer room. (2 marks)

Differentiate between analogue data and digital data as used in computers. (2 marks)

State three functions of Un-uninterruptible Power Supply (UPS). (3 marks)

Functions of the UPS

State two reasons for the increased use of laptop computers in government offices. (2 marks)

A computer teacher put a rule that diskettes should not be used in the computer laboratory

Give one way as to how each of these forms of threats can be controlled

(a) (i) What is a computer keyboard? (1mk)

List four types of keys found on a computer keyboard. Give an example of each. (4mks)

(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

List three differences between a microcomputer and a super computer (3mks)

Microcomputers

Supercomputers

State two ways in which a computer may be used in efficient running of a hospital (2mks)

Explain how each of the following would affect the suitability of a room for use as a computer room. (2mks)