In decimal terms, 1 MB equals about 1,000,000 bytes; in binary, it is 1,048,576 bytes.

A Personal Digital Assistant (PDA) was an early category of handheld computer, designed for personal organization and basic computing tasks. Over time, the functionality of PDAs, such as calendaring, contacts, and internet access, was integrated and significantly expanded into smartphones. Smartphones are now ubiquitous, powerful handheld computing devices that are much smaller and more portable than laptops, offering communication, internet browsing, applications, and much more. Servers and mainframes are large, powerful computers typically used in data centers for network services or extensive data processing, respectively. A desktop computer is a stationary device, much larger than a laptop, and not portable.

The correct answer is Bit. A bit (short for 'binary digit') is the most basic and fundamental unit of information in computing and digital communications. It can exist in one of two states, typically represented as 0 or 1. All other units of digital information, such as bytes (8 bits), kilobytes (1024 bytes), and megabytes (1024 kilobytes), are composed of multiple bits. Therefore, the bit is the foundational building block for all data stored and processed by computers.

Digital computers are by far the most prevalent type of computer in the world today. They process discrete data, typically represented as binary digits (0s and 1s). This fundamental approach allows for extraordinary precision, vast storage capacities, and the ability to execute complex algorithms and run diverse software, from the operating systems on our smartphones and personal computers to the sophisticated systems powering data centers and supercomputers. Analog computers, in contrast, represent data as continuously varying physical quantities like voltage or current. While historically significant for specific tasks, they are much less common today due to lower accuracy, difficulty in programming, and lack of flexibility compared to digital systems. Quantum computers are an emerging technology that leverages quantum-mechanical phenomena like superposition and entanglement. They hold immense promise for solving certain types of problems intractable for classical digital computers but are currently in early stages of development and not widely deployed. Hybrid computers combine aspects of both analog and digital computers, often using analog components for specific real-time calculations and digital components for control and general processing. They are used in specialized applications where their unique strengths are beneficial, but they do not represent the majority of computers in general use.

Computers are incredibly powerful tools for storing, processing, and communicating data. They excel at following algorithms and executing complex calculations at high speeds (Option A, B, and D describe core computer functionalities). However, even with the most sophisticated artificial intelligence (AI) and machine learning (ML) advancements, a computer fundamentally lacks genuine consciousness, self-awareness, or the ability to 'think' in the human sense of originating truly novel ideas or making judgments driven by independent will. They operate based on programmed instructions and statistical models derived from data, rather than intrinsic thought or understanding. While AI can simulate aspects of human thought, it doesn't possess autonomous consciousness or independent thought.

A Core Banking System (CBS) is a centralized back-end system that processes all transactions and maintains customer data across all branches of a bank. This allows customers to access their accounts and conduct transactions from any branch, ensuring consistency and real-time updates. CRM focuses on managing customer interactions, ATMs are self-service terminals, and internet banking platforms provide online access, but CBS is the underlying system that enables these functionalities through its centralized record-keeping.

A web-based application (or web app) is software that runs on a remote server and is accessed by users via a web browser over the internet. These applications do not require installation on the user's local device, though some may offer offline functionality. Google Docs perfectly fits this description as it is a word processor accessible through any web browser, stores documents online, and primarily functions with an internet connection. In contrast, Microsoft Word (when installed locally) is a desktop application, a mobile app that works offline is by definition not web-based, and a smartphone's built-in calculator is a native device application.

Computers have revolutionized modern communication by enabling unprecedented speed, reach, and versatility. Option A is incorrect because computers have made communication faster and more accessible. Option C is incorrect as computers support rich media like images, audio, and video, not just text. Option D is incorrect because, while initial infrastructure costs exist, digital communication has generally lowered the per-message or per-call cost for end-users, making it more affordable. Option B accurately describes the core impact: computers, coupled with the internet, provide platforms for instant, real-time, and often global communication via various digital channels, profoundly changing how individuals and organizations interact.

Hardware encompasses all the physical, electronic, and mechanical parts of a computer system that are visible or can be touched. This includes input devices (like keyboards, mice), output devices (like monitors, printers), storage devices (like hard drives, SSDs), and internal components (like the CPU, RAM, motherboard). Software, in contrast, is a set of instructions that tells the hardware what to do. Firmware is a specific type of software embedded in hardware devices, and middleware facilitates communication between different software applications.

A terminal is often used to access larger systems like mainframes or supercomputers for remote access.