Computer Graphics - Graphics Concepts

26:  
A circle, if scaled in only one dimension becomes a/an
A.

parabola

B.

 hyperbola

C.

 ellipse 

D.

remains a circle

 
 

Option: C

Explanation :

Let it be scaled in Y-axis with a factor k.
The equation of the circle x2 + y2 = a2, after scaling
becomes x2 + (ky)2 = a2. This can be written as x2/a2 + y2/(a/k)2 = 1. This is an ellipse.

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27:  
Choose the correct statement.
Given three non-collinear points,
 
A.
 it is always possible to draw a circle.passing through the three points.
B.
 it may or may not be-possible to draw a circie passing through the three points.
C.
 it is impossible to draw a circle passing through the three points
D.

none of the above

 
 

Option: A

Explanation :

The three given points form a triangle. This triangle will have a circum-circle that touches all the three points

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28:  
Aspect ratio is generally defined as the ratio of the
A.
vertical to horizontal points
B.
 horizontal to vertical points
C.
 vertical to (horizontal + vertical) points
D.

either (a) or (b), depending on the convention followed

 
 

Option: D

Explanation :

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29:  
The best hidden surface removal algorithm is
A.
painters 
B.
depth buffer
C.

area subdivision 

D.

depends on the application

 
 

Option: D

Explanation :

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30:  
Engineering drawing commonly applies
A.
oblique projection 
B.
orthographic projection
C.

 perspective projection 

D.

none of the above

 
 

Option: B

Explanation :

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