I/O Devices: Monitor MCQs Quiz | Class 9
This is a multiple-choice quiz for Class IX Computer Applications (Code 165), Unit 1: Basics of Information Technology. It covers the topic of Monitors as an I/O Device, focusing on concepts like output devices, display technology, and the idea of resolution. Attempt all questions and submit your answers to see your score, then download the PDF answer sheet.
Understanding Monitors and Display Technology
A monitor is one of the most common and essential output devices for a computer. It displays information in pictorial or text form, allowing users to interact with the computer’s software and data. Also known as a Visual Display Unit (VDU), its primary job is to show the results of the computer’s processing.
Key Concepts of Display Technology
1. Pixels
The screen of a monitor is made up of thousands of tiny dots called pixels (short for “picture elements”). Each pixel can be illuminated to a different color. The combination of all these colored pixels forms the image you see on the screen. The more pixels a screen has, the more detailed the image can be.
2. Resolution
Resolution refers to the total number of pixels a monitor can display, expressed as a pair of numbers: width x height. For example, a resolution of 1920 x 1080 means the screen has 1920 pixels horizontally and 1080 pixels vertically. A higher resolution means more pixels are packed into the same screen area, resulting in a sharper, clearer, and more detailed image.
3. Types of Monitors
Over the years, monitor technology has evolved significantly. The main types you should know are:
- CRT (Cathode Ray Tube): These are older, bulky monitors that used an electron gun to shoot beams onto a phosphorescent screen. They were heavy, consumed a lot of power, and are now considered obsolete.
- LCD (Liquid Crystal Display): These are flat-panel displays that use liquid crystals, which can be made to either block light or allow it to pass through. They use a backlight (usually CCFLs – cold cathode fluorescent lamps) to illuminate the pixels. They are much thinner, lighter, and more energy-efficient than CRTs.
- LED (Light-Emitting Diode): An LED monitor is an advanced type of LCD monitor. Instead of using CCFLs for backlighting, it uses more efficient and smaller Light-Emitting Diodes. This results in better contrast, a thinner design, and lower power consumption compared to standard LCDs.
Comparison of Monitor Technologies
| Feature | CRT Monitor | LCD/LED Monitor |
|---|---|---|
| Size & Weight | Bulky and heavy | Slim and lightweight |
| Power Consumption | High | Low |
| Image Quality | Good, but can flicker | Sharp, stable image |
| Common Use | Obsolete | Standard for all modern computers |
Quick Revision Points
- A monitor is a primary output device, also called a VDU (Visual Display Unit).
- The smallest element on a screen is a pixel.
- Resolution (e.g., 1920×1080) determines the sharpness and clarity of the display.
- LCD and LED monitors are flat-panel displays that replaced bulky CRT monitors.
- LED monitors are a type of LCD that use LED backlighting for better performance and efficiency.
Extra Practice Questions
- The term VDU stands for __________.
- A screen resolution of 1024 x 768 means the screen has 1024 pixels __________ and 768 pixels __________.
- What is the main advantage of an LED monitor over a CCFL-backlit LCD monitor?
- Is a touchscreen monitor an input device, an output device, or both? Explain.
- The physical size of a monitor is measured in inches, taken __________ across the screen.
