Subject: Computer

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 e quals 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.

Explanation
FIFO (First In, First Out) means that the oldest inventory items are sold or used first .
It is commonly used in inventory management to prevent obsolescence and spoilage, especially in perishable goods.

Explanation
RAM is volatile and primary memory. ROM is non-volatile and permanent storage.

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
An output device is any piece of computer hardware that converts information or data into a human-perceptible form or, historically, It can be text, graphics, tactile, audio, or video. Examples of Input Devices 1.         Keyboard. 2.         Mouse. 3.         Touchpad. 4.         Scanner. 5.         Digital Camera. 6.         Microphone. 7.         Joystick. 8.         Graphic Tablet. &** Output  Device. Printer monitor projector