Computer Graphics NTA UGC NET Question Analysis

Computer Graphics NTA UGC NET Question Analysis

Q1➡ | NET December 2022
Assertion A: A Raster scan device is a CRT graphic device and can use a television monitor for display.
Reason R: In Raster scan display the picture is composed of a series of dots. These dots are traced out as a series of horizontal lines. Television works in a similar fashion.
In the light of the above statements: choose the correct answer from the options given below
i ➥ Both A and R are true and R is the correct explanation of A
ii ➥ Both A and R are true but R is not the correct explanation of A
iii ➥ A is true but R is false
iv ➥ A is false but R is true
Best Explanation:
Answer: (i)
Explanation: Upload Soon
More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q2➡ | NET June 2022
This transformation is called:
(A)	Scaling
(B)	Shear
(C)	Homography 
(D)	Steganography 
This transformation is called
i ➥ Scaling
ii ➥ Shear
iii ➥ Homography
iv ➥ Steganography
Best Explanation:
Answer: (iii)
Explanation: Upload Soon
More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q3➡ | NET June 2022
Hidden surface removal problem with minimal 3 D pipeline can be solved with
i ➥ Painter’s algorithm
ii ➥ Window clipping algorithm
iii ➥ Brute force rasterization algorithm
iv ➥ Flood fill algorithm
Best Explanation:
Answer: (i)
Explanation: Upload Soon
More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q1➡ | NET June 2021
What is the transformation matrix M that transforms a square in the xy-plane defined by (1, 1)T, (-1,1)T,(-1,-1)T and (1,-1)T to a parallelogram whose corresponding vertices are (2, 1)T, (0,-1)T,(-2,-1)T and (0,-1)T?
i ➥
ii ➥
iii ➥
iv ➥

Show Answer With Best Explanation

Answer: I
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q2➡ | NET June 2021
Given below are two statements
Statement I:
The maximum number of sides that a triangle might have when clipped to a rectangular viewport is 6.
Statement II:
In 3D graphics, the perspective transformation is nonlinear in z.
In light of the above statements, choose the correct answer from the options given below Options:-
i ➥ Both Statement I and Statement II are false
ii ➥ Both Statement I and Statement II are true.
iii ➥ Statement I is false but Statement II is true.
iv ➥ Statement I is true but Statement II is false.

Show Answer With Best Explanation

Answer: III
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q3➡ | NET June 2021
Suppose you have eight ‘black and white’ images taken with a 1-megapixel camera and one ‘8-color’ image taken by an 8-megapixel camera.
How much hard disk space in total do you need to store these images on your computer?
i ➥ 1 GB
ii ➥ 3 GB
iii ➥ 3 MB
iv ➥ 4 MB

Show Answer With Best Explanation

Answer: IV
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q4➡ | NET June 2021
Suppose a Bezier curve P(t) is defined by the Following four control points in the xy-plane:
P0=(-2, 0); P1=(-2,4);P2=(2,4); and P3=(2,0). Then which of the following statement are correct ?
A. Bezier curve P(t) has degree 3.
B.
B. bezier curve P(t) may extend outside the convex full of its control points.
Choose the correct answer from the options below:
i ➥ A and B only
ii ➥ A and C only
iii ➥ A, B, and C
iv ➥ B and C only

Show Answer With Best Explanation

Answer: I
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q5➡ | NET June 2021
Which of the statements given below are correct?
The midpoint (or Bresenham) algorithm for rasterizing lines is optimized relative to DDA algorithm in that
A. it avoids round-off operations.
B. it is incremental.
C. it uses only integer arithmetic.
D. all straight lines can be displayed as straight (exact).
Choose the correct answer from the options given below:
i ➥ A and B only
ii ➥ A and C only
iii ➥ A, B, and C only
iv ➥ A, B, C, and D

Show Answer With Best Explanation

Answer: III
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q6➡ | NET November 2020
Given below are different properties of 3D projections from A.D. Identify the correct order on the basis of property true of
(i) a perspective projection only
(ii) an orthographic projection only
(iii) both orthographic and projective transformations and
(iv) neither orthographic nor projective transformation, respectively.

(A) Straight lines are mapped to straight lines.
(B) Distance and angles are (in general) preserved.
(C) Far away objects appear the same size as closer ones.
(D) Requires homogeneous coordinates in order for it to be encoded into linear transformation.
Choose the correct answer from the options given below:
i➥ D, C, B, A
ii➥ B, C, D, A
iii➥ D, C, A, B
iv➥ C, D, B, A

Show Answer With Best Explanation

Answer: III
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q7➡ | NET November 2020
i ➥ A-IV, B-II, C-III, D-I
ii ➥ A-IV, B-III, C-II, D-I
iii ➥ A-III, B-II, C-IV, D-I
iv ➥ A-II, B-IV, C-III, D-I

Show Answer With Best Explanation

Answer: IV
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q8➡ | NET November 2020
Given below are two statements:
Statement I: Bezier curves are curves that interpolate all of their control points
Statement II: A cubic bezier curve has four control points.
In the light of the above statements, choose the correct answer from the options given below
i ➥ Both statement I and Statement II are true
ii ➥ Both Statement I and Statement II are false
iii ➥ Statement I is correct but Statement II is false
iv ➥ Statement I is incorrect but Statement II is true

Show Answer With Best Explanation

Answer: IV
Explanation: Upload soon

More DiscussionExplanation On YouTubeTopic Help-Line

Q9➡ | NET November 2020
Concerning phong shading and gouraud shading in a 3D scene, which of the following statements are true?
(A) Gouraud shading requires more computation than phong shading
(B) Gouraud shading linearly interpolates the color of an interior pixel from the color at the vertices.
(C) Phong shading interpolates over the normal vectors specified at the vertices.
Choose the correct answer from the options given below:
i ➥ (A) and (B) only
ii ➥ (A) and (C) only
iii ➥ (B) and (C) only
iv ➥ (A), (B) and (C)

Show Answer With Best Explanation

Answer : III
Explanation:


Q10➡ | NET November 2020
The context of 3D Computer graphics, which of the following statements is/are correct?
A) Under perspective projection, each set of parallel lines in the object do not stay parallel in the image (except those that are parallel to the view plane to start with).
B) Applying a perspective transformation in the graphics pipeline to a vertex involves dividing by its ‘z’ coordinate.
C) Perspective transformation is a linear transformation.
Choose the correct answer from the options given below:
i ➥ (A) and (B) only
ii ➥ (A) and (C) only
iii ➥ (B) and (C) only
iv ➥ (A), (B) and (C)

Show Answer With Best Explanation

Answer : A
Explanation:


More Discussion Explanation On YouTubeNetwork Security Help-Line

Q11➡ | NET December 2019
If we want to resize a 1024 × 768 pixels image to one that is 640 pixels wide with the same aspect ratio, what would be the height of the resized image?
i ➥ 420 Pixels
ii ➥ 460 Pixels
iii ➥ 480 Pixels
iv ➥ 540 Pixels

Show Answer With Best Explanation

Answer: C
Explanation:
aspect ratio = width/ height
Aspect ration of 1024 × 768 pixels image = 1024/768
= 4/3
Aspect ration of modified pixels image = 640/height
aspect ratio of both the images are same
4/3 = 640/height
height = 640*3/4
= 480 pixels


Q12➡ | NET December 2019
Consider the following statement with respect to approaches to fill area on raster systems:
(P) To determine the overlap intervals for scan lines that cross the area.
(Q) To start from a given interior position and paint outward from this point until we encounter the specified boundary conditions.
Select the correct answer from the options given below:
i ➥ P only
ii ➥ Q only
iii ➥ Both P and Q
iv ➥ Neither P nor Q

Show Answer With Best Explanation

Answer: C
Explanation:


Q13➡ | NET December 2019
A rectangle is bounded by the lines x = 0; y=0, x = 5 and y = 3. The line segment joining (–1, 0) and (4, 5), if clipped against this window will connect the points _____.
i ➥ (0, 1) and (3, 3)
ii ➥ (0, 1) and (2, 3)
iii ➥ (0, 1) and (4, 5)
iv ➥ (0, 1) and (3, 5)

Show Answer With Best Explanation

Answer: B
Explanation:


Q14➡ | NET December 2019
Which of the following algorithms is not used for line clipping?
i ➥ Cohen-Sutherland algorithm
ii ➥ Southerland-Hodgeman algorithm
iii ➥ Liang-barsky algorithm
iv ➥ Nicholl-Lee-Nicholl algorithm

Show Answer With Best Explanation

ANswer -B


Q15➡ | NET June 2019
Using the phong reflectance model, the strength of the specular highlight is determined by the angle between
i ➥ The view vector and the normal vector
ii ➥ The light vector and the normal vector
iii ➥ The light vector and the reflected vector
iv ➥ the reflected vector and the view vector

Show Answer With Best Explanation

Answer: D
Explanation:


Q16➡ | NET June 2019
i ➥ Both S1 and S2 are true
ii ➥ Only S1 is true
iii ➥ Only S2 is true
iv ➥ Both S1 and S2 are false

Show Answer With Best Explanation

Answer: B
Explanation:


Q17➡ | NET June 2019
Consider a raster system with resolution 640 by 480. What size is frame buffer (in bytes) for this system to store 12 bits per pixel?
i ➥ 450 kilobytes
ii ➥ 500 Kilobytes
iii ➥ 350 kilobytes
iv ➥ 400 kilobytes

Show Answer With Best Explanation

Answer: A
Explanation:


Q18➡ | NET December 2018
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.
i ➥ P and R only
ii ➥ P,Q and R
iii ➥ Q and R only
iv ➥ P and Q only

Show Answer With Best Explanation

Answer: D
Explanation:


Q19➡ | NET December 2018
i ➥
ii ➥
iii ➥
iv ➥

Show Answer With Best Explanation

Answer: C
Explanation:


Q20➡ | NET December 2018
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.
i ➥ P only
ii ➥ Neither P nor Q
iii ➥ P and Q
iv ➥ Q only

Show Answer With Best Explanation

Answer: D
Explanation:


Q21➡ | NET June 2018
A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately :
i ➥ 16 frames per second
ii ➥ 19 frames per second
iii ➥ 21 frames per second
iv ➥ 23 frames per second

Show Answer With Best Explanation

Answer: A
Explanation: Upload Soon


Q22➡ | NET June 2018
Which of the following statements is/are True regarding the solution to the visibility problem in 3D graphics ?
S1 : The Painter’s algorithm sorts polygons by depth and then paints (scan – converts) each Polygon onto the screen starting with the most nearest polygon.
S2 : Backface Culling refers to eliminating geometry with back facing normals.
Code:
i ➥ S1 only
ii ➥ S2 only
iii ➥ Both S1 and S2
iv ➥ Neither S1 Nor S2

Show Answer With Best Explanation

Answer: B
Explanation: Upload Soon


Q23➡ | NET June 2018
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 ?
i ➥ M represents first, a scaling of vector (2, 1) followed by translation of vector (1, 1)
ii ➥ M represents first, a translation of vector (1, 1) followed by scaling of vector (2, 1)
iii ➥ M represents first, a scaling of vector (3, 1) followed by shearing of parameters (−1, 1)
iv ➥ M represents first, a shearing of parameters (−1, 1) followed by scaling of vector (3, 1)

Show Answer With Best Explanation

Answer: B
Explanation: Upload Soon


Q24➡ Net November 2017 Paper III
Which of the following is not a component of Memory tube display ?
i ➥ Flooding gun
ii ➥ Collector
iii ➥ Ground
iv ➥ Liquid Crystal

Show Answer With Best Explanation

Answer: D
Explanation: Upload Soon


Q25➡ Net November 2017 Paper III
Which of the following is not true in case of Oblique Projections?
i ➥ Parallel projection rays are not perpendicular to the viewing plane.
ii ➥ Parallel lines in space appear parallel on the final projected image.
iii ➥ Used exclusively for pictorial purposes rather than formal working drawings.
iv ➥ Projectors are always perpendicular to the plane of projection.

Show Answer With Best Explanation

Answer: D
Explanation: Upload Soon


Q26➡ Net November 2017 Paper III
With respect to CRT, the horizontal retrace is defined as:
i ➥ The path an electron beam takes when returning to the left side of the CRT.
ii ➥ The path an electron beam takes when returning to the right side of the CRT.
iii ➥ The technique of turning the electron beam off while retracing.
iv ➥ The technique of turning the electron beam on/off while retracing.

Show Answer With Best Explanation

Answer: A
Explanation: Upload Soon


Q27➡ Net November 2017 Paper III
Find the equation of the circle x2+y2=1 in terms of x’y’ coordinates, assuming that the xy coordinate system results from a scaling of 3 units in the x’ direction and 4 units in the y’ direction.
i ➥ 3(x’)2 + 4(y’)2 = 1
ii ➥ (x’/3)2 + (y’/4)2 = 1
iii ➥ (3x’)2 + 4(y’)2 = 1
iv ➥ 1/3(x’)2 + 1/4(y’)2 = 1

Show Answer With Best Explanation

Answer: B
Explanation: Upload Soon


Q28➡ Net November 2017 Paper III
Find the normalization transformation that maps a window whose lower left corner is at (1, 1) and upper right corner is at (3, 5) onto a viewport that is the entire normalized device screen.
i ➥
ii ➥
iii ➥
iv ➥

Show Answer With Best Explanation

Answer: A
Explanation: Upload Soon


Q29➡ | Net November 2017 Paper III
The three aspects of Quantization, programmers generally concerned with are:
i ➥ Coding error, Sampling rate and Amplification
ii ➥ Sampling rate, Coding error and Conditioning
iii ➥ Sampling rate, Aperture time and Coding error
iv ➥ Aperture time, Coding error and Strobing

Show Answer With Best Explanation

Answer: III
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q30➡ | Net January 2017 Paper III
Which of the following statement(s) is/are correct ?
i ➥ Persistence is the term used to describe the duration of phosphorescence.
ii ➥ The control electrode is used to turn the electron beam on and off.
iii ➥ The electron gun creates a source of electrons which are focused into a narrow beam directed at the face of CRT.
iv ➥ All of the above

Show Answer With Best Explanation

Answer: D
Explanation: Upload Soon


Q31➡ | Net January 2017 Paper III
A segment is any object described by GKS commands and data that start with CREATE SEGMENT and Terminates with CLOSE SEGMENT command. What functions can be performed on these segments ?
i ➥ Translation and Rotation
ii ➥ Panning and Zooming
iii ➥ Scaling and Shearing
iv ➥ Translation, Rotation, Panning and Zooming

Show Answer With Best Explanation

Answer: D
Explanation: Upload Soon


Q32➡ | Net January 2017 Paper III

Code:
i ➥ a-i, b-ii, c-iii, d-iv
ii ➥ a-i, b-iii, c-ii, d-iv
iii ➥ a-iv, b-iii, c-ii, d-i
iv ➥ a-iv, b-ii, c-i, d-iii

Show Answer With Best Explanation

Answer: A
Explanation: Upload Soon


Q33➡ | Net January 2017 Paper III
Below are the few steps given for scan-converting a
circle using Bresenham’s Algorithm. Which of the given
steps is not correct ?
i ➥ Compute d = 3 – 2r (where r is radius)
ii ➥ Stop if x > y
iii ➥ If d < 0, then d = 4x + 6 and x = x + 1
iv ➥ If d ≥, then d = 4 * (x – y) + 10, x = x + 1 and y = y + 1

Show Answer With Best Explanation

Answer: D
Explanation: Upload Soon


Q34➡ | Net January 2017 Paper III
Which of the following is/are side effects of scan
conversion ?
1. Aliasing
2. Unequal intensity of diagonal lines
3. Overstriking in photographic applications
4. Local or Global aliasing
i ➥ 1 and 2
ii ➥ 1,2 and 3
iii ➥ 1, 3 and iv
iv ➥ i , ii, iii, and iv

Show Answer With Best Explanation

Answer: D
Explanation: Upload Soon


Q35➡ | Net January 2017 Paper III
Consider a line AB with A=(0,0) and B=(8,4). Apply a
simple DDA algorithm and compute the first four plots
on this line.
i ➥ [(0, 0), (1, 1), (2, 1), (3, 2)]
ii ➥ [(0, 0), (1, 1.5), (2, 2), (3, 3)]
iii ➥ [(0, 0), (1, 1), (2. 2.5), (3, 3)]
iv ➥ [(0, 0), (1, 2), (2, 2), (3, 2)]

Show Answer With Best Explanation

Answer: A
Explanation: Upload Soon


Q36➡ | Net Auguest 2016 Paper III
Consider a raster grid having XY-axes in positive X-direction and positive upward Y-direction with Xmax = 10, Xmin = –5, Ymax = 11, and Ymin = 6. What is the address of memory pixel with location (5, 4) in raster grid assuming base address 1 (one) ?
i ➥ 150
ii ➥ 151
iii ➥ 160
iv ➥ 161

Show Answer With Best Explanation

Answer: IV
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q37➡ | Net Auguest 2016 Paper III
Consider a N-bit plane frame buffer with W-bit wide lookup table with W > N. How many intensity levels are available at a time ?
i ➥ 2N
ii ➥ 2W
iii ➥ 2N+W
iv ➥ 2N-1

Show Answer With Best Explanation

Answer: I
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q38➡ | Net Auguest 2016 Paper III
Consider the Bresenham’s line generation algorithm for a line with gradient greater than one, current point (xi, yi) and decision parameter, di. The next point to be plotted (xi+1, yi+1) and updated decision parameter, di+1, for di < 0 are given as _.
i ➥ xi+1 = xi +1
yi+1 = yi
di+1 = di+ 2 dy
ii ➥ xi+1 = xi
yi+1 = yi +1
di+1 = di+ 2 dx
iii ➥ xi+1 = xi
yi+1 = yi +1
di+1 = di+ 2(dx -dy)
iv ➥ xi+1 = xi +1
yi+1 = yi +1
di+1 = di+ 2(dy -dx)

Show Answer With Best Explanation

Answer: II
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q39➡ | Net Auguest 2016 Paper III
A point P(2, 5) is rotated about a pivot point (1, 2) by 60°. What is the new transformed point P’ ?
i ➥ (1, 4)
ii ➥ (–1, 4)
iii ➥ (1, – 4)
iv ➥ (– 4, 1)

Show Answer With Best Explanation

Answer: II
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q40➡ | Net Auguest 2016 Paper III
In perspective projection (from 3D to 2D), objects behind the centre of projection are projected upside down and backward onto the view-plane. This is known as _.
i ➥ Topological distortion
ii ➥ Vanishing point
iii ➥ View confusion
iv ➥ Perspective foreshortening

Show Answer With Best Explanation

Answer: III
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

Q41➡ | Net Auguest 2016 Paper III
The Liang-Barsky line clipping algorithm uses the parametric equation of a line from (x1, y1) to (x2, y2) along with its infinite extension which is given as :
x = x1 + ∆x.u
y = y1 + ∆y.u
Where ∆x = x2– x1, ∆y = y2– y1, and u is the parameter with 0 ≤ u ≤ 1. A line AB with endpoints A(–1, 7) and B(11, 1) is to be clipped against a rectangular window with xmin = 1, xmax = 9, ymin = 2, and ymax = 8.
The lower and upper bound values of the parameter u for the clipped line using Liang-Barsky algorithm is given as :
i ➥ (0, 2/3)
ii ➥ (1/6 , 5/6)
iii ➥ (0, 1/3)
iv ➥ (0, 1)

Show Answer With Best Explanation

Answer: II
Explanation: Upload Soon

More DiscussionExplanation On YouTubeLearn Topic WiseHelp-Line

error: Content is protected !!
Open chat
1
Hi,how Can We Help You ?