Practice MCQs

Explanation: 2FA adds a second layer of security beyond a password, requiring something you know (password) plus something you have (phone code) or something you are (fingerprint).

Explanation: VPN (Virtual Private Network) creates an encrypted connection over a less secure network. It protects privacy by masking the user's IP address and encrypting internet traffic.

Explanation: Malware (malicious software) is any software intentionally designed to cause damage to a computer, server, or network. Types include viruses, worms, trojans, ransomware and spyware.

Explanation: A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predefined security rules, creating a barrier between trusted and untrusted networks.

Explanation: Phishing is a cybercrime where attackers send fraudulent emails/messages that appear to be from reputable sources to trick users into revealing passwords, credit card numbers, etc.

Explanation: Python is a high-level, interpreted programming language known for its readable syntax. It is widely used in data science, AI, web development and automation.

Explanation: SQL (Structured Query Language) is the standard language for managing relational databases. It is used to create, read, update and delete (CRUD) data in databases like MySQL, PostgreSQL and Oracle.

Explanation: A variable is a named storage location in memory that holds a value which can change during program execution. Variables have a name, data type and value.

Explanation: OOP (Object-Oriented Programming) is a paradigm based on "objects" containing data and methods. Key concepts: encapsulation, inheritance, polymorphism and abstraction. Examples: Java, C++, Python.

Explanation: An algorithm is a finite, well-defined sequence of steps or instructions designed to solve a specific problem or perform a computation. All programs are implementations of algorithms.