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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