Input/Output — Set 2
Computers · इनपुट/आउटपुट · Questions 11–20 of 70
A Light Pen is an example of which type of computer device?
Correct Answer: A. Input
A light pen is a pointing input device that allows users to select items or draw on a monitor. It is sensitive to the light emitted by the screen's phosphors. This technology was common with older CRT monitors but is rarely used with modern LCDs.
Which printer technology uses static electricity and toner powder to produce high-quality text?
Correct Answer: C. Laser
Laser printers work by reflecting a laser beam onto a drum to attract toner particles. They are known for their high speed and professional print quality. This technology is preferred for office environments with high volume printing needs.
Which input device is specifically used to read the price and product details in a retail store?
Correct Answer: C. Barcode Reader
A barcode reader is an optical scanner that interprets the black and white parallel lines on products. It translates these patterns into a numerical code that the computer understands. This device greatly improves the speed and accuracy of checkout processes.
What does the abbreviation 'VDU' stand for in computer terminology?
Correct Answer: A. Video Display Unit
VDU is a general term used for any device that displays images generated by a computer. This typically refers to the monitor or a projection screen. The quality of a VDU is determined by its resolution and refresh rate.
Which input device is commonly used for biometric authentication via fingerprints?
Correct Answer: D. Fingerprint Scanner
A fingerprint scanner captures an image of the ridges and valleys on a finger for security verification. It is a common input device used for unlocking smartphones and laptops. Biometrics provides a higher level of security compared to traditional passwords.
The resolution of a computer monitor is typically measured in which unit?
Correct Answer: A. Pixels
Resolution refers to the number of individual dots of color, known as pixels, that make up the image. A higher pixel count results in a sharper and clearer display. Common resolutions include Full HD (1920x1080) and 4K.
Which device is used to play the sound generated by a computer to multiple people in a room?
Correct Answer: C. Speakers
Speakers are output devices that convert electrical audio signals into audible sound waves. They allow multiple users to hear audio from the computer simultaneously. High-end speaker systems are used for professional home theaters.
A 'Trackball' is most similar in function to which other device?
Correct Answer: C. Mouse
A trackball is a pointing device where the ball is housed on top, and the user rotates it with their fingers. Unlike a mouse, the base of a trackball remains stationary on the desk. It is often preferred by users with limited desk space or ergonomics concerns.
Which input method is used to process bank checks by reading special ink characters?
Correct Answer: C. MICR
Magnetic Ink Character Recognition (MICR) reads characters printed in magnetic ink at the bottom of checks. This technology allows banks to process millions of checks quickly and securely. It is highly resistant to fraud and forgery.
What is the primary function of a Webcam?
Correct Answer: D. To input live video and images
A webcam is a digital camera that feeds or streams its image in real-time to or through a computer. It is an essential input device for video conferencing and online streaming. Most modern laptops come with a built-in webcam.