Input /Output Devices Questions and Answers

Answer: A

The key's answer is the Comparator.

A digital comparator compares an input value with a reference value held in digital form and reports whether the input is equal to, greater than or less than it. Its whole function depends on that digital reference.

Tracking hardware and a stylus are input devices that report positions; they do not work by comparison with a reference value. Since a comparator does, 'None of the above' is wrong.

Answer: B

Correct answer: Keyboard

The keyboard is the input device present on virtually every computer and used for nearly all text and command entry. A mouse is almost as common but points rather than enters data; a modem is a communication device and a monitor is an output device.

Answer: D

Correct answer: Hardware

Hardware is the collective term for the physical parts of a computer, which includes every input and output device. Software is the set of programs, and a monitor is one output device rather than the class.

Answer: A

Correct answer: Input

Data supplied to a program from outside is its input; what the program sends back is its output. Throughput is a measure of how much work a system completes, and a report is one form output may take.

Answer: D

Correct answer: Keyboard

Text and numbers are typed, and the keyboard is the device for typing. A scanner captures an image of a page rather than its characters, and printers and plotters are output devices.

Answer: C

Correct answer: Scanner

A scanner reads a document and sends the image into the computer, so it is an input device. Plotters, printers and monitors all present results to the user and are therefore outputs.

Answer: B

Correct answer: Output

An output device is the one that carries information from the computer to the person - the monitor, the printer, the speakers. Input devices carry information the other way.

Answer: A

Correct answer: Input

An input device is the one through which information is put into the machine - keyboard, mouse, scanner, microphone. Output devices deliver results in the opposite direction.

Answer: D

Correct answer: Interpreter

An interpreter is a program that executes source code line by line, so it is software. Scanners, printers and monitors are all physical devices and therefore hardware.

Answer: D

Correct answer: View or print data

Output devices present results: the monitor displays them and the printer puts them on paper. Entering, storing and scanning are the work of input and storage devices.