Input/Output — Set 7

Correct Answer: B. Light Pen

A light pen is a light-sensitive input device used to draw or point on a monitor screen. It was one of the first direct-input devices developed for computer systems. While now largely replaced by touchscreens, it was vital for early CAD applications.

Correct Answer: B. Plotter

A plotter is an output device that uses pens or inkjets to draw high-resolution vector graphics. They are essential for producing blueprints, maps, and circuit diagrams. Plotters can handle very large paper sizes that standard printers cannot.

Correct Answer: A. Magnetic Stripe Reader

Magnetic stripe readers are used to capture data stored in the magnetic band of cards. They are standard in ATMs and Point of Sale (POS) machines for financial transactions. Swiping the card allows the reader to quickly access account information.

Correct Answer: B. Speakers

Speakers are the primary output devices for audio information in a computer system. They use electromagnetic coils to move a cone, creating the sound waves we hear. Computers often include a small internal speaker for system beeps.

Correct Answer: B. Facial Recognition Camera

Facial recognition cameras use specialized sensors to map the unique geometry of a human face. This biometric input serves as a highly secure and convenient method for authentication. It is increasingly used for secure payments and device access.

Correct Answer: B. Tab

The Tab key is used to advance the cursor to the next preset stop in a document. It is the standard tool for creating consistent indentation in word processing. In web browsers, it is used to move focus between different form fields.

Correct Answer: A. Scanner

A scanner works like a digital photocopier that sends the final image to a computer. It is used to digitize photographs, text documents, and even small 3D objects. Modern all-in-one printers usually include a built-in scanner.

Correct Answer: B. Touch Screen

A touch screen allows the kiosk to display information while also accepting user selections through physical contact. This dual-purpose hardware simplifies the user interface and saves space. Touch screens are found in everything from ticketing machines to digital signs.

Correct Answer: B. PPM

PPM stands for Pages Per Minute and is the standard metric for printer speed. It helps consumers compare the efficiency of different models for high-volume tasks. Color printing usually has a lower PPM than black-and-white printing.

Correct Answer: B. Optical Mouse

An optical mouse uses an internal sensor and a light source to detect movement relative to a surface. This design prevents dirt from clogging the internal parts, unlike older ball-based mice. Most modern computer mice are optical or laser-based.