User Interaction | MCQs

Explanation

Light pen is an optical input device.

A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display.

Explanation

An input device is a piece of equipment used to provide data and control signals to an information processing system.

An input device is used to enter data and instructions into a computer.

Examples include keyboards, mice, scanners, and microphones.

Explanation

• The operating system is also called the interface  between the user and the computer
• ..
• The Operating System is the Interface between the user and the computer.
• It is called the Interface because it converts the commands the user gives to a language that the computer can understand (machine language) and vice versa.
• Multiple operating systems are available such as Windows, Mac OS, and Linux.
• ..
• virus protection is not the function of the operating system
•  Real-time system operating system reads and reacts in actual time

Explanation

Keyboard is an input device.

Keyboard is similar to electric typewriter.

Keyboard uses serial port to connect with computer.

Keys on keyboard are of mainly three types:

Alphanumeric keys: letters and numbers 

Punctuation keys: comma, period, semicolon, etc.

Special keys: function keys, arrow keys, caps lock key, etc. 

Explanation

1.       Modeless

2.       Modal

3.       System modal