Welcome to “Naijaclass Academy” For Waec May/June 2014 Computer Studies Expo

 

Date: Wednesday, 8th May, 2024
Computer Studies (Essay & Objectives) 9:30 am – 11:30 am

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COMPUTER STUDIES
1-10: DBCCCBBDBA
11-20: ADBDDBCDAA
21-30: DCBADBDBBD
31-40: BDABACDBDB
41-50: BBCAACCDCB

 

 

WAEC COMPUTER STUDIES

NUMBER ONE

(1a)
(i) Sign in: Sign in is the process of logging into a system or service using a username and password or other credentials to access personalized content or features. By signing in, users can access their accounts, settings, preferences, and other information that is specific to them.

(ii) Search engine: A search engine is a web-based tool or software program that allows users to search for information on the internet. Users can enter keywords or queries into the search engine, which then retrieves relevant results from its index of websites and web pages.

(1bi)
(i) Figure 1: Random File Access Method
(ii) Figure 2: Sequential File Access Method

(1bii)
(i) FIGURE 1:
ADVANTAGES:
(PICK ONE ONLY)
(i) Fast access to any record
(ii) Direct access to data
(iii) Efficient for reading and writing large amounts of data
(iv) Suitable for large databases
(v) Support for random access and sequential access operations

DISADVANTAGES:
(PICK ONE ONLY)
(i) Inefficient for large data sets
(ii) Prone to data corruption
(iii) Limited portability between systems
(iv) Difficulty in managing complex data structures
(v) Limited built-in search capabilities

(ii) FIGURE 2
ADVANTAGES:
(PICK ONE ONLY)
(i) Simple to implement
(ii) Cost-effective
(iii) Suitable for large amounts of data
(iv) Easy to maintain
(v) Can be read sequentially

DISADVANTAGES:
(PICK ONE ONLY)
(i) Slow access speed
(ii) Inefficient for frequent random access
(iii) Limited concurrent access
(iv) Difficulty in updating and inserting data
(v) Susceptible to data corruption
============================================

(2ai)
(PICK ANY ONE)

(i)Data cable is a type of cable used to transfer data between devices, such as computers, smartphones, printers, and other peripherals.

(ii)Data cable is a physical medium used to establish a connection between electronic devices for the purpose of transmitting data signals.

(2aii)
(PICK ANY TWO)

(i)USB (Universal Serial Bus) cable
(ii)HDMI (High-Definition Multimedia Interface) cable
(iii)Ethernet cable
(iv)VGA (Video Graphics Array) cable
(v)DisplayPort cable
(vi)Thunderbolt cable
(vii)SATA (Serial ATA) cable

(2aiii)
Bus speed affects data transfer within a computer system. A faster bus speed means data moves quickly between components, enhancing overall system performance, while a slower bus speed leads to delays and reduced performance.

(2bi)
Register: Register refers to a small, high-speed storage area within the CPU (Central Processing Unit) of a computer. registers play a crucial role in storing and manipulating data.

(2bii)
Address: Address refers to a unique identifier assigned to a specific memory location within a computer’s memory hierarchy.
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(3a)
(i) File: A file is a collection of data or information that is stored on a computer under a specific name. Files can contain text, images, programs, or any other type of data that can be saved and accessed by the computer’s operating system.

(ii) Record: A record is a unit of data within a file or database that contains information related to a single entity or item. It consists of a collection of fields representing specific attributes or characteristics of that entity.

(iii) Field: A field is a specific piece of data within a record or database that represents a single attribute or property of the entity being stored. Fields organize data into discrete categories for easy storage, retrieval, and manipulation within a database or file structure.

(3bi)
(PICK THREE ONLY)
(i) Student ID
(ii) Date of Birth
(iii) Contact Number
(iv) Email Address
(v) Parent/Guardian Name
(vi) Grade/Class Level

(3bii)
(i) Access the student’s record in the computer system
(ii) Locate the field you want to edit
(iii) Make the necessary changes to the field
(iv) Save the changes
(v) Review the modified record for accuracy

(3biii)
(PICK TWO ONLY)
(i) Microsoft Access
(ii) MySQL
(iii) Oracle Database
(iv) PostgreSQL
(v) SQLite
(vi) Microsoft SQL Server
==================================

(4ai)
A logic truth table shows all possible combinations of inputs and their corresponding outputs, illustrating the logical relationships between them.

(4aii)
(i) AND gate
(ii) OR gate

(4aiii)

| X | Y | Z = X AND Y | Z = X OR Y|
|—–|—–|————-|———–|
| 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 1 |
| 1 | 0 | 0 | 1 |
| 1 | 1 | 1 | 1 |

(4b)
A comparator is a logic device used to compare two binary numbers or signals. It typically has two input terminals for the numbers to be compared and outputs a logical indication of their relationship, such as equality, greater than, or less than. The output is determined based on the comparison of corresponding bits of the input numbers. In essence, it examines whether one input is greater than, less than, or equal to the other. Comparators are widely used in digital circuits, such as in arithmetic and logic units (ALUs), in microprocessors, and in data processing applications. They play a crucial role in tasks such as sorting, decision-making, and controlling the flow of data in electronic systems.
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(5a)
(TABULAR FORM)
(PICK ANY TWO)

-COMPUTER-
(i) A computer is a physical device that can execute instructions and perform various tasks
(ii) computer consists of hardware components such as processors, memory, and storage devices
(iii) A computer can execute a wide range of programs and applications
(iv) A computer can directly execute machine-level instructions

-INTERPRETER-
(i) interpreter is a software program that translates and executes high-level programming language instructions.
(ii) interpreter is a software component that runs on a computer.
(iii) interpreter is specifically designed to execute programs written in a particular programming language.
(iv) An interpreter must translate the high-level programming language instructions into machine-level instructions before they can be executed.

(5bi)
(PICK ANY ONE)
(i) Easier to read and understand, making the code more maintainable and less error-prone.
(ii) Abstraction from low-level hardware details, allowing the programmer to focus on the problem-solving logic.
(iii) Portability, as high-level language code can be executed on different computer architectures with the help of compilers or interpreters.

(5bii)
(PICK ANY ONE)
(i) Closer to the hardware, allowing for more control and optimization of system resources.
(ii) Faster execution time, as low-level instructions are directly executed by the computer’s processor.
(iii) Better understanding of the underlying computer architecture and how it operates.

(5c)
(PICK ANY TWO)
(i) Efficiency: The program should be designed to use system resources (CPU, memory, storage) effectively and minimize computational overhead.
(ii) Reliability: The program should be able to handle unexpected inputs or errors gracefully, without crashing or producing incorrect results.
(iii) Maintainability: The program’s code should be organized, well-documented, and easy to understand and modify by other programmers.
(iv) Modularity: The program should be divided into smaller, reusable components or modules that can be easily tested and integrated.