CSEC Information Technology Paper 2 January 2020 - Free CXC Past Paper with Answers

Describe the function of EACH of the following hardware components of a computer system.

Random access memory

Secondary storage

Read-only memory

In the box provided below, draw a diagram showing the main functions of a computer system.

Convert the binary number $1010101_2$ to its decimal equivalent. (Show all steps in the calculation.)

Convert the decimal number $758_{10}$ to its hexadecimal equivalent. (Show all steps in the calculation.)

Compute the two’s complement of $12_{10}$ using eight bits. (Show all steps in the calculation.)

The ASCII code for S is $01010011_2$. Calculate the equivalent for W. (Show all steps in the calculation.)

Complete the table to show the storage medium and method of data access for EACH device.

Moni Pro Data Centre is currently conducting an upgrade of its facility and the IDE interface type and is trying to decide whether to implement the SATA or the SCSI interface technology.

State TWO characteristics of the IDE interface used by Moni Pro Data Centre.

Name the interface type that Moni Pro should select for its upgrade and state ONE reason for your choice.

Multiprogramming and multiprocessing

Real-time processing and batch processing

Software interface and hardware interface

System program and application program

Simplex data transmission and half-duplex data transmission

Write the following units of storage in ascending order.

Gigabyte Kilobyte Terabyte Megabyte

Rock Satellite Systems feed photographs and videos to a server station. Identify the storage unit listed in (a) (i) which would be MOST suitable for storing this data.

Complete the following table by stating ONE way in which EACH of the following devices is used in an application.

Identify TWO features from EACH of the following formatting types found in the document.

Document formatting

Character formatting

Differentiate between the TWO types of documents necessary for a word processor to generate multiple letters for invited participants.

The Em Fortress Power Service, a subsidiary of the Em Rock Group of Companies, runs an evening school for its workers who wish to pursue further studies in their areas of interest within the company. Consider the following spreadsheet created by the administrator to facilitate the tracking of employees who have indicated an interest in this initiative for 2020.

The data presented in the spreadsheet is limited to the area A1:E14.

State the term used to describe the difference between the largest numerical value and the smallest numerical value between A1:E14.

Name the area under the heading "First Name".

Name the feature used to align "Em Fortress Evening Division" across the top of the sheet.

Write a formula which could be placed in Cell D15 to calculate the total number of subjects the company will need to pay for.

Previous patterns have indicated that the number of subjects Em Fortress pays for increases by five per cent each year. Write a formula to calculate the number of subjects the company will need to pay for in 2020.

SECTION III PROBLEM-SOLVING AND PROGRAMMING – 45 marks

Answer ALL questions.

Ricardo's father owns a bus company. As a programmer, Ricardo is creating a program to calculate the revenue generated by the company. Consider the following segment of a pseudocode, created by Ricardo.

START Set total $\leftarrow 0$ Set revenue $\leftarrow 0$ Set fare $\leftarrow 3.30$ Write "Enter number of passenger:" Read passenger WHILE passenger $< > 0$ DO Set total $\leftarrow$ total + 1 Set revenue $\leftarrow$ passenger * fare Write "The total revenue is:", total Write "Enter number of passengers to continue or 0 to end the program" Read passenger ENDWHILE STOP

List the FOUR variables in the pseudocode above.

Identify the type of error that is located in the pseudocode.

In the space below, draw a flowchart to illustrate the algorithm on page 18 with the correct symbols. (Correct the error identified in (a) (ii)).

Ricardo's completed program is required to have a one-dimensional array that will store each passenger's name as shown below.

State the index location for Susan Smith.

State the size of the array.

Write Pascal code for EACH of the following statements.

Declaring the array with the appropriate name

Printing all the names stored in the array

Initializing the array within a WHILE STATEMENT

the statement to test the condition at the bottom of the loop

the comment statement

the purpose of the code

ONE relational operator used in the code

the terminating value.

Rewrite the fragment of code using the listed control structure for EACH of the following loops.

FOR

WHILE

REPEAT UNTIL

Write the arithmetic statement in the code.