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

Key Points

• In order to transmit ideas, graphic design is a creative process that mixes art and technology.
• The art of computer graphics involves using a computer to create images. Computer graphics ultimately produce a picture, which could be an engineering design, business graph, or other visual media.

 Additional Information

• Animation refers to a style of filmmaking in which the images are rapidly displayed in succession to create the illusion of movement.
• Images refer to a visual representation of something, such as a picture or photograph.
• Graphics refers to the use of computer technology to create visual images, designs, and illustrations.
• The text refers to written or printed words, as opposed to images or graphics.

Explanation:

Aspect ratio of an image = width/height

Here we have given a image with size 1920x1080 pixels.

Width = 1920 pixels

Height = 1080 pixels

Aspect ratio = 1920 /1080= 16/9

Also, width changes to 1280 pixels while aspect ratio remain same.

So, \(\frac{16}{9} = \frac{{1280}}{{height}}\)

\({\rm{height}} = \frac{{1280\; \times \;9}}{16} = 720{\rm{\;pixels}}\)

Height of resized image will be 720 pixels.

Concept:

Manhattan distance is the distance between two points measured at right angle along both the x-axis and y- axis.

Formula:

It is calculated as: if there is a point P(x₁, y₁) and Q(x₂, y₂). Then Manhattan distance is |x₂- x₁| + |y₂ – y₁|.

Calculation:

C1 : {(1,1), (3,3), (5,5)}

C2 : {(0,3), (3,0), (1,0)}

C3 : {(4,4),(2,2)}

First point is (2,2).

We have to find the Manhattan distance for cluster C1 in 2^nd iteration:

For 2^nd iteration: points will be:

\(\left( {\frac{1}{3}\left( {1 + 3 + 5} \right)} \right),\left( {\frac{1}{3}\left( {1 + 3 + 5} \right)} \right) = \left( {3,\;3} \right)\)

The correct answer is A and C only

Key Points

• A) Correct. One key feature of the Catmull-Rom spline is that it passes through its control points, making it an interpolating spline, unlike Bezier curves, which generally do not pass through all their control points.
• B) Incorrect. The Catmull-Rom spline is used for interpolation between control points, not approximation. This means it constructs a curve that precisely passes through each control point.
• C) Correct. The Catmull-Rom spline is designed to smoothly interpolate between points, ensuring continuous curvature and avoiding sharp corners or kinks in the resulting curve.
• D) Incorrect. The computation of the Catmull-Rom spline does not typically require solving a system of linear equations. It is defined by a piecewise function that directly constructs spline segments between control points based on a set of simple equations.

The correct answer is A and D only

Key Points

• A) Correct. The Z-buffer algorithm is primarily used for resolving visibility problems in 3D rendering, ensuring that closer objects are rendered in front of more distant ones.
• B) Incorrect. The Z-buffer algorithm does not operate based on the painter's algorithm. While the painter's algorithm sorts and paints surfaces from back to front, the Z-buffer algorithm uses depth information stored for each pixel to manage visibility.
• C) Incorrect. The additional memory requirement for a Z-buffer is proportional to the number of pixels in the frame buffer, not the square root. Specifically, it requires memory to store depth values (usually as floating-point numbers) for each pixel.
• D) Correct. The Z-buffer algorithm maintains a depth value (Z-value) for the closest pixel encountered so far for each pixel in the frame buffer, which is used to resolve which objects should be visible and which should be obscured.

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.

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.