Computer science WAEC past questions and answers

Computer science WAEC past questions and answers

Question: What is the purpose of an operating system?

A) Managing hardware resources

B) Running applications

C) Both A and B

D) None of the above

Answer: C) Both A and B

Question: Which data structure follows the Last In, First Out (LIFO) principle?

A) Queue

B) Stack

C) Linked List

D) Array

Answer: B) Stack

Question: What is the time complexity of the quicksort algorithm in the average case?

A) O(n)

B) O(n log n)

C) O(n^2)

D) O(log n)

Answer: B) O(n log n)

Question: Which programming paradigm promotes code reusability through the concept of classes and objects?

A) Procedural Programming

B) Object-Oriented Programming

C) Functional Programming

D) Logical Programming

Answer: B) Object-Oriented Programming

Question: What is the purpose of the HTTP protocol?

A) File transfer

B) Email communication

C) Web page communication

D) Database queries

Answer: C) Web page communication

Question: In the context of databases, what does SQL stand for?

A) Structured Query Language

B) Sequential Query Language

C) Simple Question Language

D) Systematic Query Language

Answer: A) Structured Query Language

Question: Which of the following is not a programming language?

A) Python

B) HTML

C) Java

D) SSL

Answer: B) HTML

Question: What does the acronym API stand for?

A) Application Programming Interface

B) Advanced Program Interaction

C) Automated Protocol Invocation

D) Application Process Integration

Answer: A) Application Programming Interface

Question: What is a binary search used for?

A) Sorting elements

B) Searching a sorted array

C) Hashing

D) Encrypting data

Answer: B) Searching a sorted array

Question: Which data structure is used to represent a hierarchical structure with a root value and subtrees of children?

A) Linked List

B) Tree

C) Graph

D) Stack

Answer: B) Tree

Question: What is the purpose of a firewall in a computer network?

A) Speed up internet connection

B) Block unauthorized access

C) Enhance computer performance

D) Encrypt data transmission

Answer: B) Block unauthorized access

Question: Which type of join in SQL returns all rows when there is a match in one of the tables?

A) INNER JOIN

B) LEFT JOIN

C) RIGHT JOIN

D) FULL OUTER JOIN

Answer: D) FULL OUTER JOIN

Question: What is the role of a compiler in programming?

A) Execute code line by line

B) Convert high-level code to machine code

C) Debug code errors

D) Manage memory allocation

Answer: B) Convert high-level code to machine code

Question: Which sorting algorithm has a worst-case time complexity of O(n^2)?

A) QuickSort

B) MergeSort

C) BubbleSort

D) InsertionSort

Answer: C) BubbleSort

Question: What does the acronym URL stand for?

A) Universal Resource Locator

B) Uniform Resource Locator

C) Unified Resource Locator

D) Universal Routing Locator

Answer: B) Uniform Resource Locator

Question: What is the purpose of the DNS (Domain Name System) in networking?

A) Encrypt data transmission

B) Convert IP addresses to domain names

C) Control internet speed

D) Establish secure connections

Answer: B) Convert IP addresses to domain names

Question: Which of the following is a dynamic programming language?

A) C++

B) Java

C) Python

D) C#

Answer: C) Python

Question: What is the primary purpose of a cache memory in a computer system?

A) Store temporary data

B) Increase main memory capacity

C) Speed up data access

D) Manage file storage

Answer: C) Speed up data access

Question: Which of the following is a non-relational database management system?

A) MySQL

B) Oracle

C) MongoDB

D) SQLite

Answer: C) MongoDB

Question: In networking, what does the acronym LAN stand for?

A) Local Access Network

B) Long Area Network

C) Large Area Network

D) Local Area Network

Answer: D) Local Area Network