Computer studies analysis of questions and answers

Formula is a mathematical expression that creates a relationship between cells to return a new value like = B1+b2+c3
Functions are inbuilt formula that the user can quickly use instead of having to create a new each time a calculation has to be carried out like =sum(c2:c7)

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John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

30/4/2022

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John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

Scan removable storage devices before use.
Scan email attachments for virus before opening them.
Browse smart.
Install antivirus and update regularly.

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Describe the term portability as used in the following context.

30/4/2022

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Describe the term portability as used in the following context.

Hardware

In hardware portability is the ease of carrying a hardware component or computer from one place to another with ease

Software

In software portability is the ease of copying or installing a program from one computer to another

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Mention three factors to consider when choosing an ISP for internet connectivity.

30/4/2022

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Mention three factors to consider when choosing an ISP for internet connectivity.

Cost
Speed
Reliability of the ISP
Type of connection
Availability
Agility and flexibility

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Describe four ways in which ICT can be used to improve health care provision

30/4/2022

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DESCRIBE FOUR WAYS IN WHICH ICT CAN BE USED TO IMPROVE HEALTH CARE PROVISION

Telemedicine platform for sending reminders to the patients.
Passing information from one place to another using WhatsApp’s, internet, email etc.
For control life support machines like ICU using computer-based systems
Performing research through the internet to check on the best practices.
Use of electronic displays to perform advertisement hence create aware to the patients.
Computer based systems support MRI, CITI scan and Ultrasounds.
Laser surgery

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Peter used a compact disk recordable to save his work. ½ of the disk was used to store video files while ¼ of the remainder was to save audio file. Note that CD-recordable is 700MB. Calculate the remaining space in bytes.

30/4/2022

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PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

Video =0.5 x 700= 350 …………………… ½ mark
Audio = 0.125 x 700=87.5 ………………… ½ mark
Total = 437.7 …………………… 1mark
Remaining spaces (700-437.5) = 262.5MB ………… 1mark

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Program Control Structures

30/4/2022

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Program Control Structures

program control structures are blocks of statements that determine how statements are to be executed, in structured programming languages, there are three control structures namely; sequence, selection and iteration (looping)

Sequence

In this structure, the computer reads instructions from a program file starting from the first top line and proceeding downwards one -by -one to the end. This is called sequential programming execution i.e.

Selection

In selection control, execution of statements depends on a condition which is either a true or false
There are four types of selection controls. Namely:

IF.....THEN
IF.....THEN.....ELSE
NESTED IF
CASE SECTION

IF....THEN
The IF....THEN selection is used if only one option is available. All other options are ignored
Format:
IF <condition> THEN
Statements;
ENDIF

IF....THEN....ELSE
This type of selection is suitable where there are two available options
General Format
IF <condition> THEN
Statements;
ELSE
Statements;
EndIF

Nested IF Selection
This type of selection is used where two or more options have to be considered to make a selection.
General Format
IF <condition> THEN
statements
ELSE
IF <condition> THEN
statements
ELSE
IF<condition> THEN
Statements
ELSE
Statements
ENDIF
ENDIF
ENDIF

CASE Construct
This is an alternative to the Nested IF especially where there are several options to choose from. Its preferred because it reduces the many lines of code. However, the boolean expression for the case selection can only be expressed using integers and alphabetic characters only. The General format should be
CASE integer OF or
CASE Char OF
Example:
Case x of
label 1: statement 1
label 2: statement 2
label 3: statement 3
.
.
.
label n: statement n-1
Else
statement
Endcase

Iteration (looping)

Iteration is also referred to as looping or repetition. Its designed to execute the same block of code again and again until a certain condition is fulfilled.
The three main looping controls are:-

The WHILE Loop
The REPEAT....UNTIL Loop
The FOR Loop

The WHILE Loop
The "WHILE" loop is used if a condition has to be met before the statements within the loop are executed.
General Format
WHILE condition DO
statement
ENDWHILE

The REPEAT....UNTIL loop
The REPEAT....UNTIL loop allows the statements within it to be executed at least once since the condition is tested at the end of the loop.
General Format
REPEAT
statements
UNTIL <condition>

The FOR Loop
The FOR loop is used in circumstances where the execution of the chosen statements has to be repeated a predetermined number of times.
General Format
//pseudocode for 'FOR" loop that counts from the lower limit
FOR loop variable = lower limit to upper limit DO
statements
ENDFOR

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COMPUTER STUDIES QUESTIONS AND ANSWERS MOD30042022001

30/4/2022

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COMPUTER STUDIES QUESTIONS AND ANSWERS

Section A: 40 Marks

Question Paper

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

The 2nd generation use transistor in its logic circuit while the 3rd generation used integrated circuit

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

Having large windows
Having windows and vent area opened
Using air conditioning equipment
Providing spacious seating arrangement

3 (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. @ 2

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

Caps lock, Insert, Num Lock and Scroll lock.

4. State three factors to consider when selecting an operating system to install in a computer. (3 marks)

The hardware configuration of a computer such as processor speed, amount of memory and hard disk space available
The type of computer in terms of size and make
User friendliness of the operating
Number of users it can support
Number of processors and hardware it can support
Reliability and security provided by the OS.

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

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​COMPUTER STUDIES PAPER 1 REVISION KIT 2022 TERM 2 MODEL17092022002

​​Musato high school wanted to setup a network connectivity to be used in school. Mention three internet connectivity requirement that the school must have to get the connection.

​Using relevant examples distinguish between a formula and function.

​John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

​​Describe the term portability as used in the following context.

​Mention three factors to consider when choosing an ISP for internet connectivity.

​DESCRIBE FOUR WAYS IN WHICH ICT CAN BE USED TO IMPROVE HEALTH CARE PROVISION

​PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

Program Control Structures

​Sequence

​Selection

​Iteration (looping)

​​Section A: 40 Marks

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

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

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

COMPUTER STUDIES PAPER 1 REVISION KIT 2022 TERM 2 MODEL17092022002

Musato high school wanted to setup a network connectivity to be used in school. Mention three internet connectivity requirement that the school must have to get the connection.

Using relevant examples distinguish between a formula and function.

John is a first-year student at JKUAT. He is expected to login his student portal to access online assignments. Mention three ways in which he would prevent virus from infecting his computer.

Describe the term portability as used in the following context.

Mention three factors to consider when choosing an ISP for internet connectivity.

DESCRIBE FOUR WAYS IN WHICH ICT CAN BE USED TO IMPROVE HEALTH CARE PROVISION

PETER USED A COMPACT DISK RECORDABLE TO SAVE HIS WORK. ½ OF THE DISK WAS USED TO STORE VIDEO FILES WHILE ¼ OF THE REMAINDER WAS TO SAVE AUDIO FILE. NOTE THAT CD-RECORDABLE IS 700MB. CALCULATE THE REMAINING SPACE IN BYTES.

Sequence

Selection

Iteration (looping)

Section A: 40 Marks

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