Section – A (7 x 8 marks = 56 marks)

Question 1.The co-ordinates of only one eighth of the total pixels lying on circumference of a circle are computed. Why? The Bresenhem’s circle drawing algorithm can be adapted for computing the coordinates of other pixels, explain?

Solution Scheme: 
Circle is symmetric about its axis. So, if point (x,y) is on the circle, then we can trivially compute (450 segment) seven other points (y,x),(y,-x),(x,-y),(-x,-y),(-y,-x),(-y,x),(-x,y) using the symmetry.(2 marks)
Bresenhem’s circle drawing algorithm (6 marks)

Question 2.Cohen-Sutherland line clipping technique uses the concept of region codes (or outcodes) in order to clip lines. Suppose a rectangular clip window ABCD is defined such that the lower left hand corner is at A(1,2) and upper right hand corner is at C (9,8). Clip the following line segments using Cohen Sutherland technique
  Line 1 from P(-1,7) to Q(11,1)
  Line 2 from R(3,7) to S(3,10)
  Line 3 from U(2,3) to V(8,4).

Question
A composite transformation matrix can be made by determining the ________of matrix of the individual transformation

Select one:
Addition
Subtraction
Product 
None of these

The correct answer is: Product

Question 
The alteration in which an object is relocated in a minimum distance route from one point to another is called

Select one:
a.Rotation
b. Translation 
c. Scaling
d. Reflection

The correct answer is: Translation

Question 
Random scan monitors draw a picture one line at a time

Select one:
True 
False

The correct answer is 'True'.

Question 
Personal computer become powerful during the late

Select one:
a. 1950
b. 1970 In
c. 1960
d. 1989

The correct answer is: 1960

Question 
GKS stands for

Select one:
a. None
b. Graphics kernel system 
c. Graphics kernel stand
d. Generic kernel system

The correct answer is: Graphics kernel system

Question 
The equation of translation transformation will be

Select one:
A. X1=x+Tx,y1=y+Ty,z1=z+Tz 
B. X1=x.sx,y1=y.sy,z1=z.sz
C. Both of these
D. None

The correct answer is: X1=x+Tx,y1=y+Ty,z1=z+Tz

Question 
Raster images are more commonly called

Select one:
A. Pix map
B. both a & b
C. bitmap
D. none of these

The correct answer is: bitmap

Question 
Pixel can be arranged in a regular

Select one:
A. One dimensional grid
B. None of these
C. Two dimensional grid 
D. Three dimensional grid

The correct answer is: Two dimensional grid

Question 
Plasma device converts

Select one:
a. Electrical energy into light 
b. Light into electrical energy
c. None
d. Light into graphical energy

The correct answer is: Electrical energy into light

Question 
Raster scan monitors draw a picture one line at a time

Select one:
True
False 

The correct answer is 'False'.

Question 
CRT means

Select one:
A. Common ray tube
B. Cathode ray tube 
C. Caviler ray tube
D. None of the above

The correct answer is: Cathode ray tube

Question 
In bresenhan's algorithm error term is reset to ?

Select one:
a. 1
b. -1/2
c. 1/2
d. 0 

The correct answer is: 0

Question 
In Bresenham's algorithm, when producing a circle , it is easy to produce

Select one:
a. All octants
b. One octant first and other by successive reflection 
c. One octant first and other by successive rotation
d. One octant first and other by successive translation

The correct answer is: One octant first and other by successive reflection

Question 
The transformation in which the dimension of an object are transformed relative to a specified static point is termed

Select one:
a. Reflection
b. Rotation
c. Translation
d. Scaling 

The correct answer is: Scaling

Question 
Each screen point is referred to as .........................

Select one:
a.  Resolution
b. Dot Pitch
c. Persistence
d. Pixel 

The correct answer is: Pixel

Question 
Two consecutive translation transformation t1 and t2 are

Select one:
A. Additive 
B. Subtractive
C. Multiplicative
D. None of the above

The correct answer is: Additive

Question 
The transformation that disturbs the shape of an object are called

Select one:
a. Shear 
b. Rotation
c. Reflection
d. Scaling

The correct answer is: Shear

Question 
Reflection of a point about x-axis, followed by a counter-clockwise rotation of 900 , is equivalent to reflection about the line ?

Select one:
a. x = -y
b. y = - x
c. x = y 
d. x + y = 1

The correct answer is: x = y

Question 
Types of computer graphics are

Select one:
A. Vector and raster 
B. Scalar and raster
C. Vector and scalar
D. None

The correct answer is: Vector and raster

Question 
The transformation in which an object is moved from one point to another in circular pathway around a definite pivot point is called

Select one:
a. Reflection
b. Translation
c. Scaling
d. Rotation 

The correct answer is: Rotation

Question 
Why a circle drawn on the screen appears to be elliptical ?

Select one:
a. Screen has rectangular shape
b. Our eyes are not at the same level on screen
c. It is due to the aspect ratio of monitor 
d. CRT is completely spherical

The correct answer is: It is due to the aspect ratio of monitor

Question 
The equation for describing surface of 3D plane are

Select one:
a. Ax+ By+ Cz+ D= 1
b. Ax+ By+ Cz+ D= 0
c. Ax+ By+ D= 0
d. Ax+ By+ Cz+ D= 0 

The correct answer is:  Ax+ By+ Cz+ D= 0

Question 
Vector graphics is composed of

Select one:
A. Pixels
B. Paths 
C. Palette
D. None of these

The correct answer is: Paths

Question 
The equation of scaling transformation will be

Select one:
A. X1=x+Tx,y1=y+Ty,z1=z+Tz 
B. X1=x.sx,y1=y.sy,z1=z.sz
C. Both of these
D. None

The correct answer is: X1=x.sx,y1=y.sy,z1=z.sz

Question 
DVST means

Select one:
a. Display view store tube
b. None
c. Direct view storage tube 
d. Domain view storage tube

The correct answer is: Direct view storage tube

Question 
The amount of time the phosphor produce light or shine is controlled by chemical composition of the phosphor. This is known as

Select one:
a. Persistence 
b. Resistance
c. Generators
d. None of the these

The correct answer is: Persistence

Question 
The ISO standard for computer Graphics is ?

Select one:
A. Graphics Kernel System 
B. Graphics Standard System
C. Computer graphics standard
D. None of above.

The correct answer is: Graphics Kernel System

Question 
Plasma panel is an __ device

Select one:
a. Emissive 
b. Non-Emissive
c. Expensive
d. None

The correct answer is: Emissive

Question 
Which environ has been one of the most accepted means for computer graphics in business and graphics design studios

Select one:
a. quake
b. graphics
c. Macintosh 
d. multimedia

The correct answer is: Macintosh

Question 
Maximum digit or number of points that can be presented without overlay on a CRT

Select one:
a. Aspect Ratio
b. Pixel
c. Resolution 
d. Brightness

The correct answer is: Resolution

Question
Orthographic projection represents three dimensional objects in

Select one:
a. All of the above
b. Three dimension
c. One dimension
d. Two dimension 

The correct answer is: Two dimension

Question 
The finest hidden surface removal methods used for complex scenes with more than a few thousand faces is/are

Select one:
a. scan line algorithm 
b. depth sorting method
c. octree method
d. Both (c) & (d))

The correct answer is: Both (c) & (d))

Question 
The subcategories of orthographic projection are

Select one:
a. cavalier, cabinet, isometric
b. cavalier, cabinet
c. isometric, cavalier, trimetric
d. isometric, dimetric, trimetric 

The correct answer is: isometric, dimetric, trimetric

Question 
All of the following is true about solid models, except

Select one:
a. they are 'watertight'
b. they are typically manifold models
c. they are equivalent to surface models 
d. a CSG model is one type

The correct answer is: they are equivalent to surface models

Question 
___________ modeler defines the model with surfaces bounding a region.

Select one:
a. B-rep
b. Wireframe 
c. Primitive
d. CSG

The correct answer is: Wireframe

Question 
A ______________ sweep is dependent on the location of the axis/vector relative to the profile

Select one:
a. Path based
b. Revolved 
c. Linear
d. Blended

The correct answer is: Revolved

Question 
Which two methods of defining a work plane both define the work plane parallel to a planar face

Select one:
a. Angle and Orientation
b. Through and Offset 
c. Tangent and Through
d. Offset and Tangent

The correct answer is: Through and Offset

Question 
In orthographic projection, the projection lines are ______ to the projection plane.

Select one:
a. Parallel 
b. Any of the above
c. Inclined
d. Orthogonal

The correct answer is: Orthogonal

Question 
In the term ortho-graphic, ‘orthos’ means

Select one:
a. Drawing
b. Projection
c. Straight 
d. View

The correct answer is: Straight

Question 
Orthographic projection is also known as

Select one:
a. Multi view projection 
b. Two view projection
c. Single view projection
d. All

The correct answer is: Multi view projection

Question 
The orthographic parallel projection, projection lines are ____ to each other.

Select one:
a. Parallel 
b. Any of the above
c. Perpendicular
d. Inclined

The correct answer is: Parallel

Question 
The following is not a principal view.

Select one:
a. Auxiliary 
b. Top
c. Side
d. Bottom

The correct answer is: Auxiliary

Question 
A Depth Buffer algorithm is not an _______ hidden surface removal algorithm

Select one:
a. Both
b. Image space
c. None
d. object-space 

The correct answer is: Image space

Question 
In the Painter's Algorithm, objects are ordered back-to-front and then rendered in that order

Select one:
a. False
b. True

The correct answer is: True

Question 
All the following hidden surface algorithms employ image space approach except

Select one:
a. Depth buffer method
b. Back face removal 
c. Scan line method
d. Depth sort method


The correct answer is: Back face removal