Data | MCQs

Explanation

A telephone line supports full-duplex transmission, meaning both parties can talk and listen simultaneously.

Unlike half-duplex (e.g., walkie-talkie).

Full-duplex allows two-way communication at the same time.

Explanation

Infrared communication supports data transfer rates typically ranging from 100 Kbps to 4 Mbps.

It is used in short-range, line-of-sight applications like remote controls and some wireless devices.

Explanation

Coaxial cables typically support data transmission speeds between 10 Mbps to 200 Mbps, used in cable TV and internet.

They are shielded and suitable for medium-speed data over longer distances than twisted-pair cables.

Explanation

In asynchronous transmission, data is sent one byte at a time with start and stop bits, and often a parity bit for error checking.

It's commonly used in serial communication, like keyboards and older modems.

Explanation

gets() can accept a full string including white space characters until a newline is encountered.

In contrast, getch() and getche() only accept a single character input.

Explanation

A primary key uniquely identifies each record (row) in a database table.

It ensures data integrity by preventing duplicate and null entries in the key column.

Explanation

A Database Administrator (DBA) is responsible for the design, implementation, maintenance, and repair of a database.

They ensure that the database operates efficiently, securely, and reliably.

Explanation

SQL is the specific language used to create tables, store, retrieve, and update data in a relational database.

It is designed for managing and manipulating structured data in relational databases.

Explanation

The hierarchical model organizes data in a tree-like structure, similar to an organizational chart, where each record has a single parent and can have multiple children.

It represents relationships between data in a parent-child hierarchy.

Explanation

Data acquisition refers to the process of collecting data, not a primary objective of a database.

The main objectives of a database include Data Independence, Data Integration, and Data Integrity, which focus on organizing, managing, and ensuring the accuracy of data.