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PUNJAB TECHNICAL UNIVERSITY MCA - III (SEM 5) SEP 2010 : Computer Graphics

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Roll No. ...................... Total No. of Questions : 13] [Total No. of Pages : 02 Paper ID [A0521] (Please fill this Paper ID in OMR Sheet) MCA (501) (S05) (O) (LE) (Sem. - 5th) COMPUTER GRAPHICS Time : 03 Hours Maximum Marks : 75 Instruction to Candidates: 1) Section - A is Compulsory. 2) Attempt any Nine questions from Section - B. Q1) Section - A a) (15 2 = 30) What is meant by the resolution of an image? Find the resolution of a 2x2 inch image that has 512x512 pixels. b) What is an image s aspect ratio? Find the aspect ratio of an image with the dimensions, height-2 inch, width-3 inch. c) Explain the term frame buffer. d) Describe persistence and pitch of a color CRT. e) Show that R *R =R + where R and R are the rotation matrices with angle and respectively. f) Discuss about 8-way symmetry of a circle. g) Define world co-ordinate system and view co-ordinate system. h) Differentiate between translation and rotation. i) If we translate point p(2,3) by using translate vector (tx, ty), where tx = 3 and ty = 5, what will be the new position of point P? j) Give the difference between sealing and shearing. k) Define Orthographic and oblique parallel projections. l) What is meant by vanishing point? m) Write briefly about Rendering. n) Why are hidden-surface algorithms needed? o) Define depth buffer. B-7004 P.T.O. Section - B Q2) (9 5 = 45) Differentiate between the working principle of LCD and Plasma panel displays. Q3) Describe the basic components and method of operation of a cathode ray tube. Q4) Explain the Raster and Random scan system. Q5) Derive the Bresenham line drawing algorithm. Q6) Magnify a rectangle to twice of its size. The opposite vertices of the rectangle before magnification are (10, 10) and (20, 30). Magnification is to be performed about its centroid. Q7) What is the homogeneous co-ordinate representation/Explain with reference to its use in 2D graphics. Q8) Find the condition under which we have Ssxsy*R =R *Ssxsy Where Ssxsy and R are the Scaling and Rotation matrices respectively. Q9) Find the transformation Matrix ML which reflects an object about the line L (i.e L y=mx+c). Q10) Describe the procedure of mapping a point at position (Xw, Yw) in windows to a viewpoint co-ordinate (Xv, Yv) with same relative position. Q11) Find a transformation Matrix Mv which aligns a given vector V=aI+bJ+cK with the vector K along the positive z-axis. Q12) Differentiate between parallel projection and perspective projection. Q13) Draw a comparison between Gourand shading and Phong s shading. kbkb B-7004 2

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Additional Info : Mca - III (sem 5) September 2010 Question Paper - Computer Graphics
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