Computer Science

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'.

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.

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.

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.

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

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.

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.

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.

Speakers are output devices because they convert electrical signals into sound, allowing users to hear audio from the computer. They do not take input from users, so they are not input devices.

The 'Print Screen' key on a keyboard is specifically used to capture the current screen display, making option D the correct answer.

A printer is an output device because it produces a physical copy of digital documents, whereas a keyboard and scanner are input devices. Therefore, the correct answer is Printer.

A barcode reader is an input device because it scans and inputs data (barcode information) into a computer system for processing.

MICR (Magnetic Ink Character Recognition) is the technology used by banks to read data on cheques because it allows for fast and accurate reading of the special magnetic ink characters printed on cheques. OCR and OMR are used for different purposes, and bar-code readers are not typically used for cheque processing.

A joystick functions similarly to a mouse as both are pointing input devices used to control the movement of a cursor or pointer on a screen. Unlike keyboards, cameras, or monitors, joysticks provide directional input akin to a mouse.

A daisy wheel printer uses a rotating wheel with characters on the petals (like a daisy) to strike an ink ribbon and print characters. This mechanical impact method is characteristic of daisy wheel printers, distinguishing them from non-impact printers and those that print graphics or color.

A headphone is an output device because it outputs sound from the computer to the user. It does not take input from the user, so it is not an input or input/output device.

A light pen is an input optical device that allows users to point to displayed objects on a screen by detecting light from the screen.

OCR stands for Optical Character Recognition, which is the technology used to convert different types of documents, such as scanned paper documents or images, into editable and searchable data.

A trackball is an input device used to control the cursor on a computer screen by rotating a ball with the fingers or palm. It is not a storage device, output device, or programming language.

Douglas Engelbart invented the first computer mouse in 1964 in the United States, making option A correct. The other options are notable figures in computing but not related to the invention of the mouse.

A computer program is written in a programming language that is understood by programmers and then translated into machine code that a computer can understand. Therefore, both statements A and B are valid.

The on/off power button is typically located on the side of many devices such as smartphones, tablets, and some laptops, making option C the most accurate choice.

Physical parts of a computer that can be seen and touched are called hardware, while software refers to programs and data that run on the hardware.

The transfer of data in a computer primarily involves physical components such as buses, cables, and ports that move data between devices. Software manages data but does not physically transfer it, so the correct answer is the physical part.

Computers outperform mechanical calculators primarily because of their versatility; they can perform a wide range of tasks beyond simple calculations, unlike mechanical calculators which are limited to arithmetic operations.