Computer Graphics

Question 1

What does a pixel mask mean?

• string containing only 1\'s
• string containing only 0\'s
• string containing two 0\'s
• string containing 1\'s and 0’s

Question 2

How much memory is required to implement z-buffer algorithm for a 512 x 512 x 24 bit-plane image?

• 768 KB
• 1 MB
• 1.5 MB
• 2 MB

Question 3

A frame buffer array is addressed in row major order for a monitor with pixel locations starting from (0,0) and ending with (100,100). What is address of the pixel(6,10)? Assume one bit storage per pixel and starting pixel location is at 0.

• 1016
• 1006
• 610
• 616

Question 4

In graphics, the number of vanishing points depends on

• the number of axes cut by the projection plane
• the centre of projection
• the number of axes which are parallel to the projection plane
• the perspective projections of any set of parallel lines that are not parallel to the projection plane

Question 5

Which of the following is true about z-buffer algorithm?

• It is a depth sort algorithm
• No limitation on total number of objects
• . Comparisons of objects is done
• z-buffer is initialized to background colour at start of algorithm

Question 6

A system is having 8 M bytes of video memory for bit-mapped graphics with 64-bit colour. What is the maximum resolution it can support?

• 800 x 600
• 1024 x 768
• 1280 x 1024
• 1920 x 1440

Question 7

The end points of a given line are (0, 0) and (6, 18). Compute each value of y as x steps from 0 to 3, by using equation of straight line:

• For x = 0, y = 0; x = 1, y = 3; x = 2, y = 6; x = 3, y = 9
• For x = 0, y = 1; x = 1, y = 3; x = 2, y = 4; x = 3, y = 9
• For x = 0, y = 2; x = 1, y = 3; x = 2, y = 6; x = 3, y = 9
• For x = 0, y = 0; x = 1, y = 3; x = 2, y = 4; x = 3, y = 6

Question 8

Which of the following graphic primitives are considered as the basic building blocks of computer graphics ? (a)Points (b)Lines (c)Polylines (d)Polygons Codes :

• (a) only
• (a) and (b)
• (a), (b) and (c)
• (a), (b), (c) and (d)

Question 9

What is the bit rate of a video terminal unit with 80 characters/line, 8 bits/character and horizontal sweep time of 100 μs (including 20 μs of retrace time)?

• 8 Mbps
• 6.4 Mbps
• 0.8 Mbps
• 0.64 Mbps

Question 10

Consider the two class classification task that consists of the following points: Class C₁ : [21, 21], [21, 1], [1, 21] Class C₂ : [1, 1] The decision boundary between the two classes C₁ and C₂ using single perceptron is given by:

• x₁ - x₂ - 0.5 = 0
• - x₁ + x₂ - 0.5 = 0
• 0.5(x₁ + x₂) - 1.5 = 0
• x₁ + x₂ - 0.5 = 0