## Computer-Graphics

 Question 1
Consider the matrix

representing a set of planar (2D) geometric transformations in homogeneous coordinates. Which of the following statements about the matrix M is True ?

 A M represents first, a scaling of vector (2, 1) followed by translation of vector (1, 1) B M represents first, a translation of vector (1, 1) followed by scaling of vector (2, 1) C M represents first, a scaling of vector (3, 1) followed by shearing of parameters (−1, 1) D M represents first, a shearing of parameters (−1, 1) followed by scaling of vector (3, 1)
Computer-graphics       2D-Geometrical-Transformation       UGC-NET JUNE Paper-2
Question 1 Explanation:
Scale Matrix:
The scale matrix has all the same zeros as the identity matrix, but it doesn’t necessarily keep using the ones across the diagonal. You are trying to decide how to scale your coordinate, and you don’t want the default scale value to be 1. Here is the scale matrix:

Translation Matrix:
The translation matrix looks the same as the identity matrix, but the last column is a little different. The last column applies an amount of change for the x, y and z coordinates:
 Question 2
Memory mapped displays
 A are utilized for high resolution graphics such as maps B uses ordinary memory to store the display data in character form C stores the display data as individual bits D are associated with electromechanical teleprinters
Computer-Graphics       Display-System       Nielit Scientist-C 2016 march
Question 2 Explanation:
● Graphs can be displayed on a screen by writing character values into a special area of RAM within the video controller. ● Prior to cheap RAM that enabled bit-mapped displays, this character cell method was a popular technique for computer video displays.
 Question 3
While making bubbled lists, which of the following options are available?
 A Square,disc,tringle B Triangle,disc,circle C Triangle,square,circle D Disc,square,circle
Computer-Graphics       Shapes       KVS 22-12-2018 Part-B
Question 3 Explanation:
→ Disc: A filled circle
→ Circle : An unfilled circle
→ square : A filled square
 Question 4
MPEG involves both spatial compression and temporal compression. The spatial compression is similar to JPEG and temporal compression removes_____frames.
 A Voice B Spatial C Temporal D Redundant
Computer-Graphics       Motion-Pictures       KVS 22-12-2018 Part-B
Question 4 Explanation:
→ Joint Photographic Experts Group (JPEG) is a method to compress pictures and graphics.
→ The JPEG process involves blocking, the discrete cosine transform, quantization, and lossless compression.
→ Moving Pictures Experts Group (MPEG) is a method to compress video.
→ MPEG involves both spatial compression and temporal compression. The former is similar to JPEG, and the latter removes redundant frames.
 Question 5
In which of the following, the density of the core remains constant from the center to the edges?
 A Single mode fiber B Multimedia step-index fiber C Multimode graded index fiber D Single mode step index fiber
Computer-Graphics       Multimode-Step-Index       KVS 22-12-2018 Part-B
Question 5 Explanation:
Multimode Step-index: In multimode step-index fiber, the density of the core remains constant from the center to the edges. A beam of light moves through this constant density in a straight line until it reaches the interface of the core and the cladding
 Question 6
Which of the following is a special effect in motion pictures and animation that changes one image/picture into another through a seamless transition?
 A Modeling B Morphing C Animating D Wrapping
Computer-Graphics       Transformations       KVS 22-12-2018 Part-B
Question 6 Explanation:
→ Morphing is a special effect in motion pictures and animations that changes (or morphs) one image or shape into another through a seamless transition.
→ Morphing means stretching or as part of a fantasy or surreal sequence.
 Question 7
Even when the screen is completely dark while the film is in motion, commercial motion pictures use
 A 32 frames per second or 101 screen illuminations per second B 72 frames per second or 234 screen illuminations per second C 8 frames per second or 32 screen illuminations per second D 24 frames per second or 72 screen illuminations per second
Computer-Graphics       Motion-Pictures       KVS DEC-2013
Question 7 Explanation:
→ Motion picture, also called film or movie, series of still photographs on film, projected in rapid succession onto a screen by means of light.
→ When a motion picture film is projected on a screen at the rate of at least 16 illuminations per second but the commercial motion pictures uses 24 frames per second or 72 screen illuminations per second.
→ Film Technology standard is 24 frames per second, a three bladed shutter and some dreamy motion blur, all projected as shadow and light on the side of a wall.
 Question 8
The file size of a 640 by 480 pictures of 256 colours in a 8-bit resolution is
 A 300KB B 900KB C 128KB D 1024KB
Computer-Graphics       Pixel-Resolution       KVS DEC-2013
Question 8 Explanation:
●Give picture size with 640 by 480 resolution with 256 colors per pixel.
●This implies 640 * 480 = 307,200 pixels. Recall that 256 values requires 8 bits of computer storage.
●Hence (307,200 pixels) * (8 bits per pixel) = 2,457,600 bits of storage.
●A common method for selling computer storage is in 8 bit groupings called bytes.
●Hence the picture would require (2,457,600 bits) / (8 bits per byte) = 307,200 bytes of computer storage.
 Question 9
The process of producing bitmapped images from a view of 3-D models in a 3-D scene is called
 A Rendering B Looping C Cross dissolving D Imaging
Computer-Graphics       3D       KVS DEC-2013
Question 9 Explanation:
Rendering or image synthesis is the automatic process of generating a photorealistic or non-photorealistic image from a 2D or 3D model (or models in what collectively could be called a scene file) by means of computer programs.
 Question 10
Which of the following is interactive?
 A A radio broadcast B A talk show on TV C A newspaper D A computer game
Computer-Graphics       I/O-Devices       KVS DEC-2013
Question 10 Explanation:
Options A,B and C are not interactive , it will provide only information to the people. Where as Computer game in which computer user should interact with the computer in order to play the game
 Question 11
Anti aliasing is important to improve readability of text. It deals with the
 A Elimination of "jaggies" B Spacing between two individual characters C Underlining letters D Spacing of a group of characters
Computer-Graphics       Anti-Aliasing       KVS DEC-2017
Question 11 Explanation:
● Antialiasing removes jagged edges by adding subtle color changes around the lines, tricking the human eye into thinking that the lines are not jagged.
● The slight changes in color around the edges of an image help the line blend around curves, giving the impression that the line is true.
● These color changes are made on a very small scale that the human eye cannot detect under normal circumstances. In order to be able to see that an image has been antialiased, it would have to be magnified.
 Question 12
What is the bitrate for transmitting uncompressed 800x600 pixel color frame with 8 bits/pixel at 40 frames/Second?
 A 1536 Mbps B 2.4 Mbps C 15.36 Mbps D 153.6 Mbps
Computer-Graphics       Bit-Rate       KVS DEC-2017
Question 12 Explanation:
Step-1: Given data, Uncompressed pixel = 800*600
Step-2: Each of 8 bit = 800*600 *8
Step-3: Bit rate for transmitting = 800*600 *8 *40 =153600000 bits
Step-4: Here, they are given in Mbps. 153600000 bits =153.6Mbps
 Question 13
The easiest method in flash to draw a heptagon, is to use the___
 A Polystar tool with the "Polygon" style B Polygon Tool C Lasso Tool with the "create star" option D Polystar Tool with the "star" style
Computer-Graphics       Tools       KVS DEC-2017
Question 13 Explanation:
There are 3 tools for drawing geometric shapes
1. Rectangle(Rectangle tool)
2. Oval(Oval tool)
3. Polygon(Polystar tool)
Note: We are not using Option A,C and D for drawing heptagon.
 Question 14
___ is a special effect in motion pictures and animations that changes one image or sharp into another through a seamless transition
 A Tweening B Inverse kinematics C Morphing D Tweaking
Computer-Graphics       Transformations       KVS DEC-2017
Question 14 Explanation:
Morphing is a special effect in motion pictures and animations that changes (or morphs) one image or shape into another through a seamless transition. morphing means stretching or as part of a fantasy or surreal sequence. Traditionally such a depiction would be achieved through cross-fading techniques on film.
 Question 15
Given that a 22 inch monitor with an aspect ratio of 16:9 has a monitor of 1920x1080, what is the width of the monitor?
 A 22 inches B 8:53 inches C 10:79 inches D 19:17 inches
Computer-Graphics       Aspect-Ratio       KVS DEC-2017
Question 15 Explanation:

Step-1: To check the ratio [width/height= 1920 /1080 ]
Step-2: Ratio: 16/9.
Step-3: Using Pythagoras theorem (9x)​ 2​ +(16x)​ 2​ =(22)​ 2
x=19.17 inch
 Question 16
Consider the following statements:
a) 3D Studio Max includes a number of high-level professional tools for character animation, game development, and visual effect production.
b) MAYA is a complete modeling package developed by Microsoft
c) RenderMan is a rendering package developed by Pixar
Which of the above statements are true?
 A Only a and b B Only a and c C Only b and c D a,b and c
Computer-Graphics       3D       KVS 30-12-2018 Part B
Question 16 Explanation:
MAYA 3D animation software offers a comprehensive creative feature set for 3D computer animation, modeling, simulation, rendering, and compositing on a highly extensible production platform. Maya has next-generation display technology, accelerated modeling workflows, and tools for handling complex data.
 Question 17
The ____ file format allows storing an animation sequence
 A PNG B GIF C JPG D PDF
Computer-Graphics       Motion-Pictures       KVS 30-12-2018 Part B
Question 17 Explanation:
→PDF means portable document format.
→Portable Network Graphics is a raster-graphics file-format that supports lossless data compression.
→JPG/JPEG: Joint Photographic Experts Group. JPEG is usually known as JPG. It stands for Joint Photographic Expert Group, a joint working group of International Standardization Organization (ISO) and International Electrotechnical Commission (IEC). It is a standard method of compressing graphic images.
→A GIF is a computer file that is used on the internet for sending images, especially moving images. GIF is an abbreviation for 'Graphic Interchange Format'.
 Question 18
​If the frame buffer has 10-bits per pixel and 8-bits are allocated for each of the R,G and B components then what would be the size of the color lookup table(LUT)
 A (2​ 10​ +2​ 11​ ) bytes B (2​ 10​ +2​ 8​ ) bytes C (2​ 10​ + 2​ 24​ ) bytes D (2​ 8​ + 2​ 9​ ) bytes
Computer-Graphics       LUT       UGC NET CS 2018-DEC Paper-2
Question 18 Explanation:
10-bits per pixel it means we will have 2​ 10 ​ entries in color lookup table.
8-bits are allocated for each of the R,G and B components, means each entry in color lookup table is of 24-bits( 8-bits for each of the R, G and B component).
24-bits = 3 Bytes
So the size of lookup table is = Number of entries * size of each entry
So the size of lookup table is = (2​ 10​ * 3) Bytes
the size of lookup table is = 3072 Bytes = (2​ 10​ + 2​ 11​ ) Bytes
 Question 19
Which homogeneous 2D matrix transforms the figure (a) on the left side to the figure (b) on the right ?
 A B C D
Computer-Graphics       2-D-Geometrical-Transforms-and-Viewing       UGC NET CS 2018-DEC Paper-2
Question 19 Explanation:
The homogeneous coordinates of the cartesian point (x,y) is (x,y,1) and the transformation Matrix is a 3x3 Matrix.
The image in figure ​ a ​ is translated(by 1 unit in x axis), scaled( 2 units in y axis) and rotated(90 degrees counterclockwise) to figure in b.
 Question 20
​In 3D Graphics, which of the following statements about perspective and parallel projection is/are true?
P:​ In a perspective projection, the farthest an object is from the center of projection, the smaller it appears.
Q: ​ Parallel projection is equivalent to a perspective projection where the viewer is standing infinitely far away
R: ​ Perspective projections do not preserve straight lines.
 A P and R only B P,Q and R C Q and R only D P and Q only
Computer-Graphics       3D-Geomentry       UGC NET CS 2018-DEC Paper-2
Question 20 Explanation:
Perspective Projection​ :
Perspective projection is representing or drawing objects which resemble the real thing.
Perspective projection preserves the straight line.
In perspective projection, objects that are far away appear smaller, and objects that are near appear bigger.
Parallel lines do not remain parallel
Distance and angles are not preserved.
Parallel Projection :
In this projection drawing objects looks less realistic.
In this projection parallel lines remains parallel.
Angles are not preserved in this projection.
It is good for exact measurements.
 Question 21
​In 3D Graphics, which of the following statement/s is/are true ?
P: Back-face culling is an example of an image-precision visible-surface determination.
Q: Z-Buffer is a 16-bit, 32-bit, or 64-bit field associated with each pixel in a frame buffer that can be used to determine the visible surface at each pixel.
 A P only B Q only C Neither P nor Q D P and Q
Computer-Graphics       3D-Gepmetry       UGC NET CS 2018-DEC Paper-2
Question 21 Explanation:
Back Face Culling:
→ Back-face culling (an object space algorithm) works on 'solid' objects which you are looking at from the outside. That is, the polygons of the surface of the object completely enclose the object.
→ Back-face culling is not an example of an image-precision visible-surface determination.
→ Back-face culling can very quickly remove unnecessary polygons. Unfortunately there are often times when back-face culling can not be used. For example if you wish to make an open-topped box - the inside and the outside of the box both need to be visible, so either two sets of polygons must be generated, one set facing out and another facing in, or back-face culling must be turned off to draw that object.
1. Back faces: faces of opaque object which are “pointing away” from viewer
2. Back face culling – remove back faces (supported by OpenGL)
→ TRUE: Z-Buffer is a 16-bit, 32-bit, or 64-bit field associated with each pixel in a frame buffer that can be used to determine the visible surface at each pixel.
 Question 22
The LED’s for their display require
 A A voltage of 1.2v and a current of 20 mA B A voltage of 20v and a current of 1.2 A C A voltage of 1.2v and current of 100 mA D A voltage of 10v and a current of 120 mA
Computer-Graphics       LED       NIELIT Technical Assistant_2016_march
 Question 23
Two equal voltages os same frequency applied to the X and Y plates of a CRD, produces a circle on the screen. The phase difference between the two voltages is
 A 30o B 90o C 180o D 0o
Computer-Graphics       CRD       NIELIT Technical Assistant_2016_march
There are 23 questions to complete.