B2.53-R3: COMPUTER GRAPHICS
1. There are TWO PARTS in this Module/Paper. PART ONE contains FOUR questions
and PART TWO contains FIVE questions.
2. PART ONE is to be answered in the TEAR-OFF ANSWER SHEET only, attached to
the question paper, as per the instructions contained therein. PART ONE is NOT to
be answered in the answer book.
3. Maximum time allotted for PART ONE is ONE HOUR. Answer book for PART TWO
will be supplied at the table when the answer sheet for PART ONE is returned.
However, candidates, who complete PART ONE earlier than one hour, can collect the
answer book for PART TWO immediately after handing over the answer sheet for
TOTAL TIME: 3 HOURS TOTAL MARKS: 100
(PART ONE 40; PART TWO 60)
(Answer all the questions)
1. Each question below gives a multiple choice of answers. Choose the most
appropriate one and enter in the tear-off answer sheet attached to the question
paper, following instructions therein. (1 x 10)
1.1 If a 1024 x 768 image is to be resized to one that is 640 pixels wide with the same
aspect ratio, what would be the height of resized image in pixels.
1.2 Which format is used to store digital audio in multimedia application?
1.3 Which method is also known as Painters algorithm?
A) Scan Line
1.4 For which type of display the beam-penetration method has not been used?
A) Calligraphic Display
B) Random-scan Display
C) Raster-scan Display
D) Stroke-Writing Display
1.5 A phosphor with low persistence is useful for
B) Image Processing
C) CAD method
B2.53-R3 Page 1 of 5 July, 2007
1.6 An orthographic projection is a
A) Perspective projection
B) Parallel projection
C) Projection on a curved surface
D) None of the above
1.7 Which of the following color model is useful for describing color output to hardcopy
device such as plotter?
A) RGB color model
B) YIQ color model
C) CMY color model
D) HSV color model
1.8 Which Line Clipping algorithm performs fewer comparison and division operations to clip
A) Nicholl-Lee-Nicholl line clipping algorithm
B) Cohen-Sutherland line clipping algorithm
C) Liang-Barsky line clipping algorithm
D) Cyrus-Beck line clipping algorithm
1.9 The graphics tablet belongs to which type of input device?
1.10 If the position of any one control point is altered the entire curve is affected. This
statement is true for
A) Natural Cubic Splines
B) Kocknek-Bartels Splines
D) Rational Splines
B2.53-R3 Page 2 of 5 July, 2007
2. Each statement below is either TRUE or FALSE. Choose the most appropriate one
and ENTER in the tear-off sheet attached to the question paper, following
instructions therein. (1 x 10)
2.1 Convex polygons are correctly clipped by the Weiler-Atherton polygon clipping algorithm,
but concave polygon may be clipped with extraneous lines.
2.2 The MIDI files are much more compact than digital audio files.
2.3 For Cubic Bezier curves, only four blending function can be obtained.
2.4 Space-partitioning representation describes a three-dimensional object as a set of
2.5 The maximum number of points that can be displayed without overlap on a CRT is
referred as the aspect ratio.
2.6 The multiplication of transformation matrices for two successive scaling operations is
2.7 Objects with curved boundaries are processed against rectangular clipping windows by
calculating intersections using the line equation.
2.8 Constants shading can produce good result for dull polyhedrons lit by light sources that
are relatively far away.
2.9 A commonly used image-space approach to detecting visible surface is the depth-buffer
method which compares surface depths at each pixel position on the projection plane.
2.10 Back face removal method is applicable for curved surface.
3. Match words and phrases in column X with the closest related meaning/
word(s)/phrase(s) in column Y. Enter your selection in the tear-off answer sheet
attached to the question paper, following instructions therein. (1 x 10)
3.1 Object-motion characteristics to be specified
as part of the object definition in
3.2 A common device for drawing, painting or
interactively selecting coordinates position on
B. An image file
3.3 A transformation that distorts the shape of an
object such that the transformed shape
appears as if the object were composed of
internal layer is
C. Refresh display file
3.4 To apply image-processing methods, we first
digitize a picture into
D. Line clipping
3.5 In random display, picture definition is stored
as a set of line drawing commands in an area
of memory referred to as the
E. Data glow
3.6 The midpoint subdivision algorithm is used for F. Parameterised System
3.7 Dragging in computer graphics can be
3.8 The creation and manipulation of a system
representation is termed as
H. Window transformation
3.9 The mapping of a part of a world-coordinate
scene to device coordinate is referred as
3.10 Super Sampling is also known as J. Key-Frame System
L. Viewing transformation
M. Pixel phasing
N. Post filtering
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