Computer Graphics MCQ Quiz - Objective Question with Answer for Computer Graphics - Download Free PDF

Inkjet printer:

• Inkjet printers each feature a print head containing thousands of tiny holes.
• These tiny openings drop microscopic droplets of ink onto the paper in the printer at a speed.
• Inkjet machines use a liquid ink produced either by either a coloured dye or a liquid that contains solid pigments in suspension.
• As the print head moves horizontally in the machine, the paper passes through perpendicular to it.
• As the page passes through, the individual holes in the print head are activated (usually by heat electrical current depending on the manufacturer) and a small drop of ink is pushed out onto the page. 
• This process if performed at high speed with thousands of droplets that form together to recreate the digital text or image that is being transferred onto the media.
• To the naked eye, the overall image looks to be solid because the dots are so tiny.

Important Points Daisy wheel printer

• It is an impact printing technology invented in 1970 by Dr. Andrew Gabor at Diablo Data Systems.
• It uses interchangeable pre-formed type elements, each with typically 96 glyphs, to generate high-quality output comparable to premium typewriters such as the IBM Selectric, but two to three times faster.

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Laser Printer

• ​It is a type of printer that uses a laser and electrical charge model instead of the traditional printing of ink onto paper.
• The image is created as an array of very fine dots.
• The use of a laser in this way allows the creation of very fine, detailed images.

Drum Printer

• A Drum Printer is a high-speed printer capable of printing an entire line of text at once.
• These types of printers are too fast to be measured in words or characters per minute and instead are measured in lines per minute.
• This is an old-line printer technology that used formed character images around a cylindrical drum as its printing mechanism.

The correct answer is Barcode Reader.

Key Points

• Barcode Reader:
  • This is an example of an input device used to read information contained in barcodes.

Additional Information

• Speaker:
  • This is an example of an output device.
  • It produces sound through a vibrating transducer called a driver.
•  DLP Projector:
  • It stands for Digital Light Processing Projector.
  • This is an example of an output device.
• Bubblejet Printer:
  • A Bubblejet printer is an example of an output device that is used to print information on paper.

Emissive Display

• The emissive displays are devices that convert electrical energy into light.
• Examples are Plasma Panel, thin film electroluminescent display and LED (Light Emitting Diodes).

Non-Emissive Display 

• The Non-Emissive displays use optical effects to convert sunlight or light from some other source into graphics patterns.
• Examples are LCD (Liquid Crystal Device).

Hence, the correct answer is option 2.

To convert from CMY (Cyan, Magenta, Yellow) to RGB (Red, Green, Blue), we can use the following formulas:

• R = 1 - C
• G = 1 - M
• B = 1 - Y

where C, M, and Y are the values in the CMY colour space, and R, G, and B are the corresponding values in the RGB colour space.

Given the CMY coordinates (0.25, 0.65, 0), we can calculate the corresponding RGB values as follows:

• R = 1 - C = 1 - 0.25 = 0.75
• G = 1 - M = 1 - 0.65 = 0.35
• B = 1 - Y = 1 - 0 = 1

Therefore, the RGB coordinates of the colour at (0.25, 0.65, 0) in CMY space are (0.75, 0.35, 1).

To determine the 4-bit area code for the endpoints of the line PQ, we can use the Cohen-Sutherland line clipping algorithm, which divides the 2D plane into nine regions and assigns a 4-bit binary code to each point based on its position relative to the rectangular window.

The 4-bit code is determined as follows -

• Bit 1: Set to 1 if the y-coordinate of the point is above the window, 0 otherwise.
• Bit 2: Set to 1 if the y-coordinate of the point is below the window, 0 otherwise.
• Bit 3: Set to 1 if the x-coordinate of the point is to the right of the window, 0 otherwise.
• Bit 4: Set to 1 if the x-coordinate of the point is to the left of the window, 0 otherwise.
• The 4-bit area code for a point inside the window is 0000.

Using this method, we can calculate the 4-bit area code for each endpoint of the line PQ:

• Endpoint P: (-4, 2)
  • Bit 1: 0 (below the window)
  • Bit 2: 0 (above the window)
  • Bit 3: 0 (left of the window)
  • Bit 4: 1 (outside window to the left)
  • 4-bit area code: 0001
     
• Endpoint Q: (-1, 8)
  • Bit 1: 1 (above the window)
  • Bit 2: 0 (below the window)
  • Bit 3: 0 (left of the window)
  • Bit 4: 0 (inside window)
  • 4-bit area code: 1000

Therefore, the 4-bit area code for the endpoint P is 0001 and the 4-bit area code for the endpoint Q is 1000.

The correct answer is ODT.

Key Points

• A bitmap basically describes a type of image. 
• Pixels all the basic sources of information.
• BMP, GIF, JPEG, EXIF, PNG, and TIFF are bitmap file formats.
• Bitmap format commonly used raster graphic format for saving image files. 
• Raster graphics are independent of display devices which means a bitmap image file can be viewed without any graphics adaptor. 
• The file can store a 2D digital image in both monochrome and colour format.

The correct answer is option 2.

Concept:

A single BUS structure is used to connect the I/O devices. One common bus is utilized to communicate between peripherals and the CPU in a single bus configuration. It has drawbacks owing to the usage of a single common bus.​

• All units are connected to a single bus, so it provides the sole means of interconnection. A single bus structure has the advantages of simplicity and low cost.
• Because only two units may participate in data transmission at the same time, single bus structures have the drawback of the restricted speed.
• This necessitates the use of an arbitration mechanism, as well as the forced waiting of units.
• An example is a communication between the processor and printer.

Hence the correct answer is Single BUS structure.

Additional Information

•  MULTIBUS II is an open system bus architecture for designing general-purpose 8-, 16-, and 32-bit microcomputer systems.

The correct answer is Laser Printers and Inkjet Printers.

Key Points

• Non-Impact Printers:
  • These printers do not allow direct contact between ribbon and paper. Use laser, electrophotographic, electrostatic, chemical, or inkjet technology.
  • Examples: Laser Printers, Inkjet Printers, Thermal printers, Bubblejet Printers.

Additional Information

•  Impact Printers:
  • These printers allow direct contact between ribbon and paper.
  • In these printers, printing is done by character dye.
  • Examples: Dot Matrix Printers, Daisy Wheel Printers, Drum Printers.

The Correct Answer is Joystick.

 Key Points

• Joy Stick is a  pointing device used to move an object on a screen in any direction.
• It employs a vertical rod mounted on a base with one or two buttons.
• Joysticks are often used to control video games, and usually have one or more push-buttons whose state can also be read by the computer.

 Additional Information

• Optical Mark Reading (OMR)
  • Optical Mark Reading (OMR) is a method of entering data into a computer system.
  • Optical Mark Readers reads pencil or pen marks made in pre-defined positions on paper forms as responses to questions or tick list prompts.
• Visual Display Unit
  • Visual Display Unit is a device for displaying input signals as characters on a screen.
  • The monitor is an example of VDU.
• MIDI (Musical Instrument Digital Interface) controller
  • It is a way to connect devices that make and control sounds — such as synthesizers, samplers, and computers — so that they can communicate with each other.

Explanation:

• Some commonly used Input/Output devices are listed in the table below. 

Input device:

• An input device is a piece of hardware used to provide data to a computer used for interaction and control. It allows the input of raw data to the computer for processing.​
• Some of the input devices are
  • ​Keyboard: Keyboard is one of the primary input devices used to input data and commands. It has function keys, control keys, arrow keys, a keypad, and the keyboard itself with the letters, numbers, and commands.
  • Mouse: It is an input device used to control the cursor and coordinates. It can be wired or wireless.
  • Microphone: It is an input device that allows users to input audio into their computers.
  • Scanner: It is an input device that reads an image and converts it into a digital file. A scanner is connected to a computer through a USB.
  • Touchscreen: It is an input device that allows users to interact with a computer using their fingers. It is used widely in laptop monitors, smartphones, tablets, cash registers, and information kiosks.  
  • Plotter: The plotter is the computer's output device that could print graphics as well as accommodate full-size engineering and architectural drawings. Using multiple colored pens, plotters were also able to print in color long before inkjet printers became an alternative.

The correct answer is Red, Green, Blue.

• Red, green, and blue are the primary colours of light—they can be combined in different proportions to make all other colors.
• There are two colour models:
  • Light Color Primaries (Red, Green, Blue).
  • Pigment Color Primaries (Cyan, Magenta, Yellow).

Important Points

• Primary colours make all other colours:
  • Red + Green = Yellow.
  • Green + Blue = Cyan.
  • Blue + Red = Magenta.
• There are three Secondary Colors (S'): Orange, Green, Violet.
• There are six Tertiary Colors (Ts): Red-Orange, Yellow-Orange, Yellow-Green, Blue-Green, Blue-Violet, Red-Violet.
  • Tertiary is formed by mixing a primary with a secondary.

Additional Information

• In terms of wavelengths, visible light ranges from about 400 nm to 700 nm.
• light with a wavelength of about 400 nm is seen as violet, and light with a wavelength of about 700 nm is seen as red.

Key Points

• The inner surfaces of human eyes contain photoreceptors—specialized cells that are sensitive to light and relay messages to the brain.
  • There are two types of photoreceptors: cones (which are sensitive to colour) and rods (which are more sensitive to intensity).
  • Humans are able to see an object when light from the object and enters their eyes and strikes these photoreceptors.

The correct answer is Both 1 and 2.

Key Points

• Multimedia is the use of a computer to present and combine text, graphics, audio, and video with links and tools that allow the user to navigate, interact, create and communicate.
• Multimedia is broadly divided into linear and non-linear multimedia.

Additional Information

• Linear Multimedia
  • The end-user cannot control the content of the application.
  • A linear multimedia application lacks all the features with the help of which, a user can interact with the application such as the ability to choose different options, click on icons, control the flow of the media, or change the pace at which the media is displayed.
  • It works very well for providing information to a large group of people such as at training sessions, seminars, workplace meetings, etc.
• Non-Linear Multimedia
  • The end-user is allowed the navigational control to rove through multimedia content at his own desire.
  • The user can control the access of the application.
  • Non-linear offers user interactivity to control the movement of data. For example computer games, websites, self-paced computer-based training packages, etc.

Key Points

 The process of converting a vector graphic to a bitmap is also known as rasterizing.

When you export a file to a bitmap file format, such as TIFF, JPEG, CPT, or PSD, the same bitmap conversion options are available.

Hence the correct answer is rasterization.

Additional Information

• Quantization, involved in image processing, is a lossy compression technique achieved by compressing a range of values to a single quantum value. When the number of discrete symbols in a given stream is reduced, the stream becomes more compressible.
• pixelization is the deterioration of a low-resolution image caused by a lack of enough pixels to render an image smoothly.
• The sampling rate determines the spatial resolution of the digitized image, while the quantization level determines the number of grey levels in the digitized image.

The correct answer is option 1.

Key Points

 Horizontal retracing is also known as vertical retracing. The beam returns to the left of the screen at the end of each scan line to show the next scan line.

∴ Hence the correct answer is The path an electron beam takes when returning to the left side of the CRT.

To find the height of the image, we need to use the aspect ratio and the width of the image.
The aspect ratio is defined as the ratio of the width to the height of the image.

In this case, the aspect ratio is 3:2, which means that for every 3 units of width, the image has 2 units of height. To find the height of the image, we can set up a proportion:
=> \(\frac{\text{width}}{\text{height}} = \frac{3}{2}\) 

Substituting the given values, we get:
=> \(\frac{\text{4 inch}}{\text{height}} = \frac{3}{2}\)

To solve for the height, we can cross-multiply:
=> 4 inch x 2 = height x 3

Simplifying this expression gives us:
=> 8 inch = height x 3

Dividing both sides by 3 gives us:
=> height = \(\frac{8}{3} \text{inch}\)

So the height of the image is approximately \(\frac{8}{3} \text{inch}\) when the width is 4 inches and the aspect ratio is 3:2.