Explanation

The data dictionary is a part of a DBMS that stores metadata — details like table names, field names, data types, constraints, and relationships.

It helps the system manage and understand the structure of the database.

Explanation

A passive topology means that devices on the network simply listen for signals and do not actively amplify or forward the signal along the network.

The Bus topology is a classic example of this.

Where data is transmitted directly on the shared cable without any intermediary device actively boosting the signal

Explanation

 The ASCII 7-bit code is a character-encoding scheme that uses 7 bits to represent characters.

- The number of bits in ASCII 7-bit code is 7.

Explanation

DEO stands for Data Entry Operator, a person responsible for entering and managing data in computer systems.

This role is essential in offices, organizations, and administrative work for accurate record-keeping.

Explanation

Minimum zooming is 10% and Maximum zooming is allowed in 400%.

So, 500% is invalid zoom percentage in Excel.

Explanation

Most databases and spreadsheets (like Excel or Google Sheets) allow users to freely add or delete rows and columns.

This flexibility helps in updating or organizing data as per requirements.

Explanation

In Excel, formulas must begin with an equals sign (=).

Options A, B, and C are all valid formulas.

Option D (C1+15) is not a valid formula because it lacks the = sign.

Explanation

Printer is an output device because it produces a hard copy of digital data.

Mouse, Scanner, and Keyboard are all input devices used to send data to the computer.

Explanation

Shortwave radio operates in the high frequency (HF) band, typically between 3 MHz and 30 MHz.

The range 5.9 MHz to 26.1 MHz is commonly used for long-distance communication like international broadcasting.

Explanation

Fiber optics uses light to transmit data at high speeds through thin glass or plastic fibers.

It is mainly used in communication networks like internet, telephone, and cable TV.