Computer Science

MICR stands for Magnetic Ink Character Recognition, a technology used primarily in banking to read characters printed with magnetic ink, enabling automated processing of checks and other documents.

A computer mouse moves by being physically moved across a surface, whereas a trackball remains stationary and the user rotates the ball to move the cursor. Therefore, the trackball is stationary during use.

Fingerprint readers are biometric devices commonly used in security systems and criminal investigations to identify individuals based on their unique fingerprint patterns. Other options like robots, sound cards, and barcode readers are not typically used for identification in these contexts.

OMR stands for Optical Mark Reader, a device used to detect marks made on paper, commonly used in multiple-choice exams and surveys.

Arrow keys on a keyboard are commonly referred to as navigation keys because they are used to move the cursor or selection in different directions on the screen.

To hear and play music on a computer, both a sound card and speakers are required. The sound card processes audio signals, while speakers output the sound. A microphone is used for input, not playback.

An electronic copy of data viewed on a computer's display is called a soft copy, as it exists in digital form and is not physically printed. A hard copy refers to a physical printout, while gold copy and premium copy are not standard terms in this context.

Output devices are hardware components used to display or present data from a computer to the user, such as monitors and printers. Therefore, the correct answer is 'Output devices'.

Ctrl, Shift, and Alt keys on a keyboard are commonly known as modifier keys because they modify the function of other keys when pressed together. The term 'adjustment keys' is not standard, but since 'modifier keys' is not among the options, the closest correct term is 'Adjustment keys' (option A). The other options are incorrect or invalid.

Virtualization is the process of creating a virtual version of a device or resource, such as a server, storage device, or network, allowing multiple virtual systems to run on a single physical system. This matches option B exactly.