Computer Graphics Questions (GateOverflow)
1. A Steiner patch is
ISRO200874
1.Biquadratic Bezeir patch
2.Bicubic patch
3.Circular patch only
4.Bilinear Bezier patch
2. Which of the following is/are side effects of scan conversion ?
a. Aliasing
b. Unequal intensity of diagonal lines
UGCNETJan2017III-17
c. Overstriking in photographic applications
d. Local or Global aliasing
(1) a and b (2) a, b and c (3) a, c and d (4) a, b, c and d
3. Using the phong reflectance model, the strength of the specular
highlight is determined by the angle between
A.the view vector and the normal vector
UGCNETJune-2019II-30
B.the light vector and the normal vector
C.the light vector and the reflected vector
D.the reflected vector and the view vector
4. In perspective projection, if a line segment joining a point which lies in
front of the viewer to a point in back of the viewer is projected to a
broken line of infinte extent. This is known as ____
1.View confusion
UGCNETJune2016III-16
2.Vanishing point
3.Topological distortion
4.Perspective foreshortening
5. Match the following :
a.Glass
i. Contains liquid crystal and serves as a
bonding surface for a conductive coating.
b. Conductive coating
ii. Acts as a conductor so that a voltage can
be applied across the liquid crystal.
c. Liquid crystal
iii. A substance which will polarize light
when a voltage is applied to it.
1
UGCNETJan2017III-15
Computer Graphics Questions (GateOverflow)
d. Polarized film
iv. A transparent sheet that polarizes light.
Codes :
a b c d
(1) i ii iii iv
(2) i iii ii iv
(3) iv iii ii i
(4) iv ii i iii
6. 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
UGC NET
July 2018 Q
9
(scan - converts) each Polygon on to the screen starting with the most
nearest polygon.
S2: Backface Culling refers to eliminating geometry with backfacing
normals.
1.S1 only
2.S2 only
3.Both S1 and S2
4.Neither S1 nor S2
7. Let us consider that the original point is (x,y) and new transformed
point is (x’,y’). Further Shx and Shy are shearing factors in x and y
directions. If we perform the y direction shear relative to x=sref then the
transformed point is given by
UGCNETJune2016III-17
1.x′=x+Shx.(y−yref);y′=y
2.x′=x;y′=y.Shx
3.x′=x;y′=Shy(x−xref)+y
4.x′=Shy.y;y′=y.(x−xref)
8. A point P(5,1) is rotated by 90o about a pivot point (2,2). What is the
coordinate of new transformed point P'?
2
UGCNET-
Computer Graphics Questions (GateOverflow)
1.(3,5)
June2016III-14
2.(5,3)
3.(2,4)
4.(1,5)
9. In the context of 3D computer graphics, which of the following
statements is/are true?
P : Orthographic transformations keep parallel lines parallel.
UGCNETJune-2019II-29
Q : Orthographic transformations are affine transformations.
Select the correct answer from the options given below:
A.Both P and Q
B.Neither P nor Q
C.Only P
D.Only Q
10 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?
A.450 kilobytes
UGCNETJune-2019II-27
B.500 kilobytes
C.350 kilobytes
D.400 kilobytes
11 Consider the following statements regarding 2D transforms in
. computer graphics:
S1:[100−1] is a 2×2 matrix that reflects (mirrors) only 2D point
about the X-axis.
S2: A 2×2 matrix which mirrors any 2D point about the X-axis, is a
rotation matrix.
What can you say about the statements S1 and S2?
A.Both S1 and S2 are true
B.Only S1 is true
C.Only S2 is true
D.Both S1 and S2 are false
3
UGCNETJune2019-II28
Computer Graphics Questions (GateOverflow)
12 Which of the following graphics devices are known as active graphics
. devices?
1.Alphanumeric devices
UGCNETSep2013III-59
2.Thumb wheels
3.Digitizers
4.Joystics
1.I and II
2.III and IV
3.I, II and III
4.I, II, III and IV
13 A diametric projection is said to be trimetric projection when
.
1.two of the three foreshortening factors are equal and third is
arbitrary
UGCNETSep2013III-60
2.all of the three foreshortening factors are equal
3.all of the three foreshortening factors are arbitrary
Which of the above is true?
1.I and II
2.II and III
3.I only
4.III only
14 In Cyrus-Beck algorithm for line clipping the value of t parameter is
. computed by the relation:
(Here P1 and P2 are the two end points of the line, f is a point on the
boundary, n1 is inner normal).
1.(P1−fi).ni(P2−P1).ni
2.(fi−P1).ni(P2−P1).ni
3.(P2−fi).ni(P1−P2).ni
4.(fi−P2).ni(P1−P2).ni
4
UGCNETDec2014
-III-17
Computer Graphics Questions (GateOverflow)
15 Consider the Breshenham’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 _______.
UGCNETAUG2016
-III-15
1.xi+1=xi+1yi+1=yidi+1=di+2dy
2.xi+1=xiyi+1=yi+1di+1=di+2dx
3.xi+1=xiyi+1=yi+1di+1=di+2(dx–dy)
4.xi+1=xi+1yi+1=yi+1di+1=di+2(dy–dx)
16
.
UGCNETJuly2018-II10
17 Find the transformation matrix that converts a square with diagonal
. vertices (0,3) and (-3,6) into a unit square at the origin??
2D
Transforma
tions
18 A graphic display system has a frame buffer that is 640 pixels high ans 1
. bit of color depth. If the access time for each pixel on the average is 200 UGCNETnanoseconds, then the refresh rate of this frame buffer is approximately:
1.16 frames per second
July-2018II-8
2.19 frames per second
3.21 frames per second
4.23 frames per second
19 Below are the few steps given for scan-converting a circle using
. Bresenham’s Algorithm. Which of the given steps is not correct ?
(1) Compute d=3–2r (where r is radius)
(2) Stop if x>y
(3) If d<0, then d=4x+6 and x=x+1
(4) If d≥0, then d=4∗(x–y)+10,x=x+1 and y=y+1
5
UGCNETJan2017III-16
Computer Graphics Questions (GateOverflow)
20 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.
(1) [(0, 0), (1, 1), (2, 1), (3, 2)]
UGCNETJan2017III-18
(2) [(0, 0), (1, 1.5), (2, 2), (3, 3)]
(3) [(0, 0), (1, 1), (2, 2.5), (3, 3)]
(4) [(0, 0), (1, 2), (2, 2), (3, 2)]
21 Which of the following statements is/are True regarding the solution of
. the visibility problem in 3D graphics?
UGCNETS1: The painter's algorithm sorts polygons by depth and then paints
(scan - converts) each Polygon on to the screen starting with the most
nearest polygon
July-2018II-9
S2: Backface Culling refers to eliminating geometry with backfacing
normals
1.S1 only
2.S2 only
3.Both S1 and S2
4.Neither S1 nor S2
22 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+Δx.u
y=y1+Δy.u
Where Δx=x2–x1,Δy=y2–y1, and u is the parameter
with 0≤u≤1. A line AB with end points 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 :
1.(0,23)
2.(16,56)
3.(0,13)
4.(0,1)
6
UGCNETAUG2016III-18
Computer Graphics Questions (GateOverflow)
23 The three aspects of Quantization, programmers generally concerned
. with are:
A. Coding error, Sampling rate and Amplification
UGCNETNov2017-iii18
B. Sampling rate, Coding error and Conditioning
C. Sampling rate, Aperture time and Coding error
D. Aperture time, Coding error and Strobing
24 With respect to CRT, the horizontal retrace is defined as:
.
UGCNETA. The path an electron beam takes when returning to the left side of the Nov2017-iiiCRT.
15
B. The path an electron beam takes when returning to the right side of
the CRT.
C. The technique of turning, the electron beam off while retracing.
D. The technique of turning, the electron beam on/ off while retracing.
25 Which of the following is not true in case of Oblique Projections?
.
A. Parallel projection rays are not perpendicular to the viewing plane.
B. Parallel lines in space appear parallel on the final projected image.
UGCNETNov2017-iii14
C. Used exclusively for pictorial purposes rather than formal working
drawings.
D. Projectors are always perpendicular to the plane of projection.
26 Which of the following is not a component of Memory tube display?
.
A. Flooding gun
B. Collector
C. Ground
D. Liquid Crystal
7
UGCNETNov2017-iii13
Computer Graphics Questions (GateOverflow)
27 Which of the following color models are defined with three primary
. colors ?
1.RGB and HSV color models
UGCNETJune2014III-05
2.CMY and HSV color models
3.HSV and HLS color models
4.RGB and CMY color models
28 Given below are certain output primitives and their associated
. attributes. Match each primitive with its corresponding attributes:
List-I
List-II
a. Line
i. Type, Size, Color
b. Fill Area
ii. Color, Size, Font
c. Text
iii. Style, Color, Pattern
d. Marker
iv. Type, Width, Color
UGCNETJune2014III-03
a-i; b-ii; c-iii; d-iv
a-ii; b-i; c-iii; d-iv
a-iv; b-iii; c-ii; d-i
a-iii; b-i; c-iv; d-ii
29 Line caps are used for adjusting the shape of the line ends to give them a
. better appearance. Various kinds of line caps used are
UGCNET-
June2014III-02
1.Butt cap and sharp cap
2.Butt cap and round cap
3.Butt cap, sharp cap and round cap
4.Butt cap, round cap and projecting square cap
30 Perform window to viewport transformation for the point (20,15).
. Assume that (Xwmin ,Ywmin) is (0,0) ; (Xwmax ,Ywmax) is (100,100) ; ISRO2018(Xvmin ,Yvmin) is (5,5) ; (Xvmax ,Yvmax) is (20,20) . The value of x and
y in the viewport is
x=4,y=4
x=3,y=3
8
39
Computer Graphics Questions (GateOverflow)
x=8,y=7.25
x=3,y=4
31 How much memory is required to implement z-buffer algorithm for a
. 512 x 512 x 24 bit-plane image?
1.768 KB
ISRO201434
2.1 MB
3.1.5 MB
4.2 MB
32 Which of the following is true about z-buffer algorithm?
.
1.It is a depth sort algorithm
ISRO2011-7
2.No limitation on total number of objects
3.Comparisons of objects is done
4.z-buffer is initialized to background colour at start of algorithm
33 A segment is any object described by GKS commands and data that start
. with CREATE SEGMENT and Terminates with CLOSE SEGMENT
UGCNETcommand. What functions can be performed on these segments ?
Jan2017III-14
(1) Translation and Rotation
(2) Panning and Zooming
(3) Scaling and Shearing
(4) Translation, Rotation, Panning and Zooming
34 n perspective projection (from 3D to 2D), objects behind the centre of
. projection are projected upside down and backward onto the viewplane. This is known as _____.
1.Topological distortion
2.Vanishing point
3.View confusion
4.Perspective foreshortening
9
UGCNETAUG2016III-17
Computer Graphics Questions (GateOverflow)
35 MPEG involves both spatial compression and temporal compression.
. The spatial compression is similar to JPEG and temporal compression
removes _____ frames.
1.Temporal
UGCNETSep2013III-55
2.Voice
3.Spatial
4.Redundant
36
.
UGCNETAUG2016III-14
37 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) ?
UGCNETAUG2016III-13
1.150
2.151
3.160
4.161
38
.
UGCNETDec2012III-71
10