# Computer Graphics

• Last Updated : 07 May, 2018

 Question 1
What does a pixel mask mean?
 A string containing only 1's B string containing only 0's C string containing two 0's D string containing 1's and 0’s
ISRO CS 2014    Computer Graphics
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Question 1 Explanation:
Pixel counts for the span length and interspan spacing can be specified in a pixel mask, which is a string containing the digits 1 and 0 to indicate which positions to plot along the line path. The mask 1111000, for instance, could be used to display a dashed line with a dash length of four pixels and an interdash spacing of three pixels. So, option (D) is correct.
 Question 2
How much memory is required to implement z-buffer algorithm for a 512 x 512 x 24 bit-plane image?
 A 768 KB B 1 MB C 1.5 MB D 2 MB
ISRO CS 2014    Computer Graphics
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Question 2 Explanation:
Z-buffer, which is also known as the Depth-buffer method is one of the commonly used method for hidden surface detection. Z-buffer requires 2 type of buffers to be filled: Depth buffer and Frame buffer Space required by depth buffer = 512 x 512 x 24 = 6291456 bits. Space required by frame buffer = 512 x 512 x 24 = 6291456 bits. Total space required = 6291456 + 6291456 bits = 12582912 bits ≈ 1.5 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.
 A 1016 B 1006 C 610 D 616
ISRO CS 2014    Computer Graphics
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 Question 4
In graphics, the number of vanishing points depends on
 A the number of axes cut by the projection plane B the centre of projection C the number of axes which are parallel to the projection plane D the perspective projections of any set of parallel lines that are not parallel to the projection plane
ISRO CS 2013    Computer Graphics
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Question 4 Explanation:
A vanishing point is a point on the image plane of a perspective drawing where the two-dimensional perspective projections (or drawings) of mutually parallel lines in three-dimensional space appear to converge. So, (D) is the correct option.
 Question 5
Which of the following is true about z-buffer algorithm?
 A It is a depth sort algorithm B No limitation on total number of objects C . Comparisons of objects is done D z-buffer is initialized to background colour at start of algorithm
ISRO CS 2011    Computer Graphics
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Question 5 Explanation:
Option 1: False, as it is a depth buffer and not depth sort algorithm. Option 2: True, as the size of objects can be large. Option 3: False, as only the depth of object is compared and not the entire object. Option 4: False, no background colour is initiated even at the start of algorithm. Option (B) is correct.
 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?
 A 800 x 600 B 1024 x 768 C 1280 x 1024 D 1920 x 1440
ISRO CS 2011    Computer Graphics
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 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:
 A For x = 0, y = 0; x = 1, y = 3; x = 2, y = 6; x = 3, y = 9 B For x = 0, y = 1; x = 1, y = 3; x = 2, y = 4; x = 3, y = 9 C For x = 0, y = 2; x = 1, y = 3; x = 2, y = 6; x = 3, y = 9 D For x = 0, y = 0; x = 1, y = 3; x = 2, y = 4; x = 3, y = 6
UGC NET CS 2015 Dec – III    Computer Graphics
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 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 (a) only B (a) and (b) C (a), (b) and (c) D (a), (b), (c) and (d)
UGC NET CS 2015 Dec – III    Computer Graphics
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Question 8 Explanation:
Points(Co-ordinate) and lines are the basic building blocks of computer graphics. So, Option (B) is correct.
 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)?
 A 8 Mbps B 6.4 Mbps C 0.8 Mbps D 0.64 Mbps
ISRO CS 2011    Computer Graphics
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Question 9 Explanation:
Refer: GATE-IT-2004 | Question 11 Option (B) is correct.
 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:
 A x1 - x2 - 0.5 = 0 B - x1 + x2 - 0.5 = 0 C 0.5(x1 + x2) - 1.5 = 0 D x1 + x2 - 0.5 = 0
UGC NET CS 2015 Dec – III    Computer Graphics
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There are 23 questions to complete.
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