1/21/20

Previous year question for Computer Science and Engineering semester 6 Computer Graphics year 2019

Computer Graphics Question
Sub Code: - 1618604

2019(Even)
Time : 3Hrs
Semester  VI(New)
Computer Graphics
Full Marks : 70
Pass marks : 28

Group A

Choose the most suitable answer from the following options: -   (1*20=20)

(i) How many types of video compressions?

(a) 2
(b) 3
(c) 4
(d) 5

(ii) Which image file are lossy format?

(a) GIF
(b) MPEG
(c) JPEG
(d) PNG

(iii) How many steps process for creating a 3D animation?

(a) 1
(b) 2
(c) 3
(d)4

(iv) JPEG stands for:

(a)Joint Photo Experts Gross
(b) Joint Photographic Experts Gross
(c) Joint Photographic Experts Group
(d)  Joint Photographic Expression Group

(v) Which compression provides some loss of quality?

(a) Loss less
(b) Lossy
(c) Cel based
(d) Object Based

(vi) in Brasenham’s circle generation algorithm, if (x,y) is the current Pixel position then y value of the next pixel position is:

(a) Y or Y + 1
(b) Y alone
(c) Y + 1 or Y - 1
(d) y or y - 1

(vii) Bresenham’s Algorithm seeks to select the optimum raster locations that represent a:

(a) Straight line
(b) Circle line
(c) Polygon
(d) None of these

(viii) The DDA algorithm is a faster method for calculating pixel positions that direct use of line equation using y =mx + c because

(a) It eliminates floating point addition
(b) It eliminates floating point multiplication
(c) It eliminates rounding operation
(d) None of these

(ix) _____________ acts as anode in CRT

(a) The Phosphorous coating
(b) The glass panel
(c) The deflectors
(d) None of these

(x) Slope of the line joining the points (1,2) and (3,4) is:

(a) 0
(b) 1
(c) 2
(d) 3

(xi) Which device is used to grasp a virtual object?

(a) Space ball
(b) Data glove
(c) Digitizer
(d) Touch panels

(xii) The maximum number of dots that can be displayed without overlap on CRT is referred to as:

(a) Refresh rate
(b) Interlacing
(c) Screen resolution
(d) None of these

(xiii) In circle drawing algorithm we use-

(a) 4- Symmetry
(b) 2- Symmetry
(c) 8- Symmetry
(d) None of these

(xiv) Clipping algorithms are

(a) Two or three dimensional
(b) Two dimensional
(c) Three dimensional
(d) None of these

(xv) When projection lines are perpendicular to the view plane then such type of projection is called:

(a) Parallel
(b) Perspective
(c) Orthographic
(d) Oblique

(xvi) The viewing transformation is formed by-

(a) Translation
(b) Translation and Scaling
(c) Translation, scaling and reflection
(d) Translation, scaling and rotation

(xvii) Minimum memory required for frame buffer when resolution is 800 x 600 and bit/pixel is 8?

(a) 512 Kb
(b) 1 Mb
(c) 2 Mb
(d) 256 Kb

(xviii) Which is not image file format?

(a) bmp
(b) jpg
(c) tiff
(d) Both (a) and (b)

(xix) How many matrices are required to rotate an object about points (x,y)?

(a) 2
(b) 3
(c)4
(d) 5

(xx) If direction of rotation is Z-axis, then direction of position of positive rotation is:

(a) y to x
(b) z to x
(c) x to y
(d) y to z

Group:-"B"

Answer all Five Questions: -                         (5*4=20)

2. Define pixel and resolution.
OR
Give the matrix representation for 2D scaling.

3. State any two graphics functions with its syntax.
OR
List any four areas of applications of computer graphics.

4. Define convex and concave polygon.
OR
State equations of line in slope intercepts from.

5. Write a ‘C’ program to draw following shapes with given points.
1. Line (20, 20, 60, 60)
OR
Write DDA line drawing algorithm.

6. State the concept of Interpolation.
OR
Define Window and viewport.

Group:- "C"

Answer all Five Questions: -                         (5*6=30)

7. Explain the procedure to generate Bezier curve.
OR
Explain graphics pipeline in detail.

8. Translate the polygon with co-ordinate A (2,5), B (7,10), and c(10,2) by 3 units in x-direction and 4 units in y-direction.
OR
Derive the expression for decision parameter used in Bresenham’s circle algorithm.

9.  Define the following terms: -
2.     Frame buffer
OR
Explain with a neat diagram, how video display works.

10.  What do you mean by animation? What are different kinds of animation techniques used in graphic system?
OR
What is open GL? What are the features of Graphics Library?

11. Explain following character generation methods with example.
1.      Stroke method
2.     Starburst method
OR
Write algorithm to clip line using cohen Sutherland line clipping algorithm.

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