Answer: PDA

Explanation:

The correct answer is (d) PDA, which stands for Personal Digital Assistant. A PDA is a small, handheld computer that is designed to be portable and easy to use. It typically has a touch screen and can be used to access the internet, send and receive emails, keep a calendar, and perform other simple tasks. While some PDAs may have limited computing power compared to larger devices like desktop or notebook computers, they are designed to be highly portable and convenient for use on-the-go. Therefore, options (a), (b), (c) are incorrect.

Answer: Mainframe computer

Explanation:

Mainframe computer is not a microcomputer. Microcomputers are small, relatively inexpensive computers designed for personal or small business use, and include desktops, laptops, tablets, and handheld devices. Mainframe computers, on the other hand, are large, powerful computers used primarily by large organizations for data processing, transaction processing, and other mission-critical applications. Mainframes are typically much more expensive and specialized than microcomputers, and require specialized skills and knowledge to operate and maintain.

Answer: laptops

Explanation:

Computers that are portable and convenient for users who travel are known as laptops.

Answer: mainframe

Explanation:

The correct answer is (b) mainframe. A mainframe computer is a large and expensive computer system that is designed to process vast amounts of data and support hundreds or thousands of users simultaneously. Mainframe computers are typically used by large organizations and government agencies for critical applications such as transaction processing, financial transactions, and scientific research. They are known for their high levels of reliability, availability, and security. A server is a computer system that provides resources or services to other computers or devices on a network. A desktop computer is a personal computer designed for use on a desk or table, and a tablet is a portable, handheld device with a touch screen display. Therefore, options (a), (c), and (d) are incorrect.

Answer: Common Operating Machine Purposely Used for Technological and Educational Research

Explanation:

The full form of computer is "Common Operating Machine Purposely Used for Technological and Educational Research". However, it is worth noting that this term is rarely used in modern times, and the word "computer" is generally understood to refer to electronic devices used for processing data and performing a wide range of tasks.