Understanding Graphics and Input Devices

What is a Cathode Ray Tube (CRT)?

• A Cathode Ray Tube (CRT) is a type of LED display.

• A Cathode Ray Tube (CRT) is a vacuum tube that displays images by directing electron beams onto a phosphorescent screen.

• A Cathode Ray Tube (CRT) is a solid-state device that emits light.

• A Cathode Ray Tube (CRT) uses liquid crystals to display images.

Describe how a Raster Scan Display works.

• A Raster Scan Display illuminates pixels in a systematic top-to-bottom and left-to-right pattern, refreshing the image multiple times per second.

• A Raster Scan Display only refreshes the image once per minute.

• A Raster Scan Display uses a circular pattern to illuminate pixels.

• A Raster Scan Display operates by illuminating pixels randomly across the screen.

What are the advantages of Plasma displays over LCDs?

• Plasma displays consume less power than LCDs.

• Plasma displays are lighter and more portable than LCDs.

• Advantages of Plasma displays over LCDs include better color accuracy, deeper blacks, wider viewing angles, faster response times, and more vibrant colors.

• LCDs have better color accuracy than Plasma displays.

Explain the basic functioning of a Liquid Crystal Display (LCD).

• LCDs use only solid crystals to display images.

• A Liquid Crystal Display (LCD) uses liquid crystals that align in response to electric currents to modulate light and create images.

• Liquid crystals are heated to create images in an LCD.

• LCDs rely on mechanical movement to change images.

What is the primary use of plotters in graphics?

• To convert raster images into vector formats.

• The primary use of plotters in graphics is to produce high-quality printed graphics and detailed drawings.

• To create 3D models for virtual reality applications.

• To enhance the color depth of digital images.

How does a printer differ from a plotter in terms of output?

• A printer outputs designs on fabric, while a plotter outputs text on paper.

• A printer only prints in black and white, while a plotter can print in color.

• A printer is used for 3D printing, while a plotter is used for text documents.

• A printer outputs text and images on paper, while a plotter outputs high-quality graphics and designs, often on larger media.

List two advantages of using a keyboard as an input device.

• Increased risk of repetitive strain injuries.

• 1. Efficient data entry. 2. Tactile feedback for accurate typing.

• Higher cost compared to other input devices.

• Limited compatibility with software.

What is the function of a trackball in computer navigation?

• To manage file storage on the computer.

• To connect to Wi-Fi networks.

• To increase the screen brightness.

• The function of a trackball in computer navigation is to control the cursor movement on the screen.

How does a light pen work as an input device?

• A light pen detects its position on a screen by emitting light and receiving signals from the display.

• A light pen functions by scanning the screen and printing the image directly onto paper.

• A light pen operates by generating sound waves to detect its position on the screen.

• A light pen works by using a stylus that connects to a computer via Bluetooth.

What is the purpose of a digitizing camera in graphics?

• To create 3D models from sketches.

• To store images in physical albums.

• To convert real-world images into digital format for graphic design.

• To enhance the quality of printed photographs.