mc0072
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Subject : Computer Graphics (MC0072)
Provided by www.programmer2programmer.net
PART A
Q.1 Consider the line from (0, 0) to (5,5).
Rasterizing the line with the Bresenham’s
algorithm yields error term =
A) -1/2
B) 1/2
C) 4/5
D) 1/5
Q.2 As the mouse is rolled around on a flat
surface, its movement is in ____ direction is
translated into rotation of the wheel
A) Orthogonal
B) Oblique
C) Parallel
D) None of these
Q.3 Representing a three dimensional object in
a two dimensional medium is called
A) Projection
B) Transformation
C) Translation
D) Rotation
Q.4 Process of determining which pixels will
provide the best approximation to the desired
line is properly known as _____
A) Scan conversion
B) rasterization
C) Interlacing
D) All of the above
Q.5 The glow off by the, phosphor during
exposure to the electron beam is known as
A) Persistence
B) Phosphorescence
C) Fluorescence
D) All of the above
Q.6 Disadvantage of edge fill algorithm is
A) Expense associated with sorting the various lists
B) Expense associated with maintaining
C) Algorithm is limited to input/output considerations
D) All of the above
Q.7 Bresenham’s circle algorithm uses ____ of a
circle to generate a circle
A) 2-way-symmetry
B) 8-way-symmetry
C) 4-way-symmetry
D) 6-way-symmetry
Q.8 In ordered, edge list algorithm, each pixel
in the display is visited ______
A) twice
B) only once
C) thrice
D) cannot be specified
Q.9 “The mouse cannot be used for tracing
paper―. This statement is
A) FALSE
B) TRUE
C) Partially true
D) Can’t predictable
Q.10 In Algorithm for identifying completely
visible and most invisible line the number of
regions use is
A) 8
B) 4
C) 9
D) 16
Q.11 A object-space algorithm for hidden surface
removal work concentrates on _____
A) geometrical relationships among the objects in the scene
B) Final image
C) Both A) and B)
D) Spatial relationship of final object
Q.12 Which of the following line is partially
visible?
A) Line ab with end point codes 0100 and 0100
B) Line bc with end point codes 1000 and 0010
C) Line Pq with endpoint codes 1001 and 1000
D) line xy with end point codes 0000 and 0010
Q.13 After identifying visible surfaces by a hidden
surface algorithm, is ______ is used to
compute the intensities and colors to display for
the surface
A) Shading model
B) Perspective Projection
C) Scaling
D) Mirror reflection
Q.14 If the slope of the line is zero, the line is
A) parallel to left and right edges
B) perpendicular to top and bottom edges
C) perpendicular to left and right edges
D) only top edges need to be checked for intersections
Q.15 _____ is the process of extracting a
portion of a database
A) Flipping
B) Clipping
C) Concatenation
D) Spooling
Q.16 ______ statement is false
A) Farther an object is from the center of projection, the smaller it appears
B) Projections of lines that are parallel to the view plane appear to meet at some
point on the view plane.
C) Objects behind the center of projection are projected upside down and backward
on to the view plane
D) A finite line segment joining a point which lies back of viewer point in back of
the viewer, is actually projected to a broken line of infinite extent
Q.17 When phosphor will no longer be
fluoroscent, it is said to be
A) dead
B) Burned
C) Inactive
D) all of the above
Q.18 The error term for a non zero intercept of
General Bresenham’s Algorithm is
A) 2dy-dx
B) 2dx-dy
C) 2dx+dy
D) 2dy+dx
Q.19 The error term of integer Bresenham’s
Algorithm is given as
A) 2edy
B) -2dex
C) 2edxdy
D) 2edx
Q.20 If 4 bit binary representation of ‘6’ is shifted
right 4time them it yields
A) 4
B) 12
C) 3
D) 16
Q.21 _____ algorithms are not limited to simple
polygons
A) Edge fill algorithm
B) Edge flag algorithm
C) Fence fill algorithm
D) all of the above
Q.22 Integer (-8.5) =
A) -8
B) -9
C) -10
D) None of these
Q.23 Find the slope of line from
P1 (-3/2, -1) to P2 (3/2, 2)
A) 2/3
B) 1/3
C) ½
D) 1
Q.24 For the line from Pl(-3/2, 1/6) to P2(1/2,
3/2), the slope is ______
A) 2/3
B) 3/2
C) 1/6
D) 1/3
Q.25 The equation of the infinite line through
P1(X1 Y1) and P2(X2, Y2) is Y =
A) m(x-x1)+y1
B) m(y-y1)+x1
C) m(x1-x)+y1
D) m(y1-y)+XL
Q.26 S-1sxsy =
A) Ssysx
B) S1/sx 1/sy
C) -Ssxsy
D) None of these
Q.27 1. If the refresh rate is greater than the
phosphor’s persistence, moving object will tend
to become
A) Blurred
B) Brightened
C) Flickered
D) None of these
Q.28 Refreshing of a CRT is done to avoid
A) Flickering
B) Interlacing
C) Blurring
D) None of the above
Q.29 A scaling constant indicates an expansion of
length
A) Equal to 1
B) greater than one
C) less than 1
D) less than 0
Q.30 The process of determining which pixel will
provided the best approximation to the desired
line is know as
A) Scan conversion
B) lipping
C) rasterization
D) None of these
Q.31 Choose the oblique projections from
below
A) General
B) Cavalier
C) Cabinet
D) All the above
Q.32 _____ algorithm can be used to handle on
cave polygons
A) Weiler algorithm
B) Atherton algorithm
C) Weiler and Atherton algorithm
D) None of the above
Q.33 Sutherland-Hodgman algorithm is used for
A) line drawing
B) Polygon clipping
C) Circle generating
D) None of these
Q.34 Disadvantage of using mouse is
A) Cannot be used for tracing data from paper
B) Very difficult to handprint characters recognition by the computer
C) Both A) and B)
D) None of the above
Q.35 In a conventional CRT the yoke is connected
to a ___
A) Sweep
B) Scan generator
C) Either A) or B)
D) None of these
Q.36 Select the feature of Midpoint subdivision
algorithm
A) Requires calculation of the intersection of the line with window page
B) Hardware implementation of the algorithm is slow
C) Software implementation of the algorithm is slow
D) None of the above
Q.37 In modified scan line co-ordinate system,
horizontal edges are ignored, because
A) Horizontal edges intersect a scan line
B) Horizontal edges are not formed
C) Horizontal edges are always formed
D) Horizontal edges cannot intersect a scan line
Q.38 The process of scaling changes ___of an
object
A) Sign
B) Dimension
C) Both A) and B)
D) None of these
PART B
Q.1 The glow given off by the, phosphor
during exposure to the electron beam is know
as _____ and the continuing glow given off
after the beam is removed is known as _____
A) Persistence, fluorescence
B) Phosphorescence, fluorescence
C) Fluorescence, phosphorescence
D) Persistence, phosphorescence
Q.2 Except at boundary edges, adjacent pixels
are likely to have the same characteristics, and
this property is referred as ______ and far a
raster scan graphics device adjacent pixels on a
scan line are likely to have the same
characteris
A) Scan line, Boundary
B) Boundary, Spatial
C) Spatial, Scan line
D) Scan line, Spatial
Q.3 In a CRT, at the end of each line the beam
must turned off and redirected back to the left
hand side of the CRT. The return sweep is
called _____ and shutting off of the electron
beam as it returns from the bottom of the
display at the
A) Retracing, Blanking
B) Blanldng, retracing
C) horizontal retrace blanking, vertical retrace blanking
D) vertical retrace blanking, horizontal retrace blanking
Q.4 Perspective drawing are characterized by
____ and _____
A) Vanishing Points, view confusion
B) View confusion, Perspective foreshortening
C) Perspective foreshortening, vanishing points
D) Topological distortion, view confusion
Q.5 Select true statements regarding Edge Flag
Algorithm
i) It is three step process
ii) The second step is to fill between bounding
pixels
iii) The first step is to outline the contour
A) i) and ii)
B) ii) and iii)
C) i) and iii)
D) i), ii) and iii)
Q.6 ____is the place where displays image is
stored as a matrix of intensity values and
_____ passes the contents of the frame buffer
to the monitor
A) Digital memory, Displays controller
B) Television monitor, Displays controller
C) Digital memory, Television monitor
D) None of the above
Q.7 Midpoint of the line having the end points (-
308, 632) and (820, -136) is
A) (247, 256)
B) (257,243)
C) (256, 248)
D) (0,0)
Q.8 Choose the ingredients of the shading
models
i) Properties of intensities
ii) Properties of the surface
iii) Properties of the illumination falling on it
A) i) and iii)
B) ii) and iii)
C) i) and ii)
D) i), ii) and iii)
Q.9 Consider the line from (0, 0) to (5, 5) then
applying Bresenham’s Algorithm yields dy =
______ and e = _______
A) 5, ½
B) -5, -½
C) 5, -½
D) -5, ½
Q.10 In Cohen Sutherland algorithm ___ bit is
set if the end point is to the right of the window
and ______ bit is set if the end point is below
the window
A) First, Third
B) Second, Third
C) First, Fourth
D) Fourth, Second
Q.11 _____ gives the correct definition of Edge
fill algorithm
A) For each scan line intersecting a polygon edge at (x complement all pixels whose
midpoints lie to the right of(x
B) For each scan line intersecting a polygon edge at (x complement all pixels whose
midpoints lie to the left of (xi.yi).
C) If the intersection is to the left of the fence, complement all pixels whose
midpoint lies to left or on the intersection of the scan line
D) If the intersection is to the right of the fence, complement all the pixels
Q.12 Match the following intersections with the
window edges
Set – A
i) y=m(XL-X1)+y1 mK±M
ii) y=X1+(y=X1+(1/m) (yB-y1) mK0
Set – B
1. Right
2. Top
3. Left
4. Bottom
A) i) -4, ii) -3
B) i) -3, ii) -4
C) i) -2, ii) -1
D) i) -4, ii) -1
Q.13 Choose the oblique projectors from below
i) General
ii) Auxiliary views
iii) Trimetric
iv) One principal vanishing point
v) Cabinet
A) i), iii) and iv)
B) i), iii) and v)
C) i), ii) and iv)
D) i) and v)
Q.14 Find the slop and mid point of the line
P1(-3/2, 1/6) to P2 (1/2, 3/2)
A) -2/3, (1/2, 5/3)
B) -3/2, (1/2, -5/3)
C) -1/2, (1/2 -5/3)
D) 2/3, (-1/2, 5/3)
Q.15 Which of the following specifies the process
of scan converting a circle using Bresenham’s
algorithm
A) If the eight-way symmetry of a circle is used to generate a circle, points will
have to be 90° to 450 angle
B) If the eight-way symmetry of a circle is used to generate a circle, moves will be
made only in the positive direction
C) If the eight-way symmetry of a circle is used to generate a circle, points will only
have to be generated through a 90° angle
D) If the weight-way symmetry of a circle is used to be generated a circle, points
will only have to be generated through a 450 angle and if points are generated
from 900 to 450 moves will be made only in the +x and —y directions
PART C
Q.1 Select the features applicable for seed fill
algorithms
a. Algorithm attempts to find and fill all pixels
interior to the region
b. If the region is interior-defined, then all the
pixels in the interior of the region boundary
have
A) a, b, c, d, e
B) c, d, e
C) b, d
D) a, c, d, e
Q.2 In two dimensional clipping, if any
coordinate of either end point is outside the
window, then the line is _____ . If both end
points are left, right above or below the
window, the line is _____. If both end points
are interior to the
A) Trivially invisible, not totally visible, totally visible
B) Not tolally visible, trivially invisible, visible
C) Totally visible, trivially invisible, not totally visible
D) Visible, Not totally visible, trivially invisible
Q.3 Match the following:-
Set – A
i) Used to create a clear picture
ii) Used to control the direction of the electron
beam
iii) Used to regulate the flow of electrons
Set – B
1. Deflection yoke
2. Electron gun
3. Focusing e
A) i)-2, ii)-3, iii)-4
B) i)-3, ii)-4, iii)-2
C) i)-2, ii)-4, iii)-1
D) i)-3, ii)-1, iii)-4
Q.4 Consider the DDA algorithm. Consider the
line from (0, 0) to (-8, -4) in the third quadrant
then value of length = _______, dx = ______
and dy = ______
A) -4, 1, -0.5
B) .4, 1, 0.5
C) -8, -1, 0.5
D) 8, -1, -0.5
Q.5 Bresenham’s line algorithm includes _____
features
a. Algorithm seeks to select the optimum raster
locations to represent a straight line
b. If the error term is negative, the line will
pass below the middle of the pixel
c. Algorit
A) a, b, c, d
B) a, d, e
C) only b and d
D) a, b, c, e
Q.6 Select true statements regarding edge fill
algorithm
i) This algorithm is most conveniently used with
frame buffer
ii) This algorithm is limited by input/output
considerations
iii) This algorithm allows the polygon edges to
be
A) ii), iii) and iv)
B) i), ii) and iii)
C) i) and ii)
D) All the above
Q.7 Which of the following statements are false
regarding polygon dipping algorithm?
a. It is based on the observation that it is
relatively easy to dip a polygon against a single
clipping edge
b. Algorithm operates vertices of the polygo
A) c, d, e
B) a, b
C) a, d, e
D) b, d, e
Q.8 Match the following:-
Set A
i) Projection plane parallel to principal planes
ii) Projection not perpendicular to projection
plane
iii) Projection plane not parallel to principal
plane
Set B
1. Orthographic
2. Axonometri
A) i)-3, ii)-4, iii)-2
B) i)-4, ii)-1, iii)-3
C) i)-3, ii)-4, iii)-1
D) i)-2, ii)-4, iii)-1
Q.9 Select the points true for two dimensions
graphics transformation
a. If the displacement of a object p(x, y) is
given by the vector V=t + t. , then new object
co-ordinates are x+t and y+ty
b. In a scaling transformation, only origin <b
A) a, b, c, d, e
B) a, b, c, d
C) c, e
D) b, d, e
Q.10 State True or False for raster-scan CRT
a. An electron gun consists of a heater and a
cathode
b. Control electrode is used to regulate the flow
of electrons
c. Focusing electrode is used to control the
direction of electron beam <b
A) a-T, b-T, c-F, d-F, e-F
B) a-I, b-F, c-T, d-T, e-F
C) a-F, b-I, c-F, d-F, e-T
D) a-I, b-F, c-F, d-I, e-T
Q.11 Consider the line (0, 0) to 5, 5)
Rasterizing the line with the Bresenham’s
algorithms
yields initial calculations dx = ______dy = ____
and e = ____
A) 5. 0 -0.5
B) 5, 5, 0.5
C) 5, 5 -0.5
D) -0, 5, 0.5
Q.12 ______ gives the correct representation of
simple incremental algorithm
A) position = start step = increment 1. If position end end then 2 if position
B) position = start step = increment 1. If position _ end end then 3 if position
C) position = start step = increment 1. If position_ end end then 2 if position
D) position = start step = increment 1. position=position_step go to 1 2. If
position_end end then 3 if position
Q.13 Match the following:
Set – A
i) The farther an object is from the center of
projection, the smaller it appears
ii) Object behind the center of projection are
projected upside down
iii) A finite line segment joining a point which <b
A) i)-3, ii)-4, iii)-2
B) i)-4, ii)-1, iii)-2
C) i)-2, ii)-3, iii)-4
D) i)-3, ii)-1, iii)-4
Q.14 Consider the edge flag algorithm
Contour outline:
for x+1/2>x intersection to the boundary value
Fill:
For each scan line intersecting the polygon
Inside = _______
for X = 0 (left) to X=Xmax(right)
if the pixel at x is set to t
A) True, false, set, reset
B) False, true, reset, set
C) False, True, set, reset
D) True, false, set, set
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