A. 
A perspective projection produces realistic views.

B.  A parallel projection gives realistic representation of 3D objects. 
C. 
A perspective projection preserves realistic dimensions.

D.  Both (b) & (c) 
Option: D Explanation : Click on Discuss to view users comments. 
A. 
C hides A and B, if viewed from V

B. 
C hides A but not B, if viewed from V

C. 
A hides B but not C, if viewed from V

D.  B hides A but not C, if viewed from V 
Option: D Explanation :
The equation of the line joining V and A is given by x = t + 3; y = t + 6; z = 4  t. Since Band C satisfy this, all the four points are collinear. We can find that t = 0 for A, t = 1 for B, t = 2 for V and t = 3 for C. From these values it is clear that these points lie in the order C, V, B, A. Hence the answer
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A.  130 
B.  165 
C.  150 
D.  170 
Option: C Explanation :
We have to find the temperature that is same in Mars and Jupiter. Put M = J in the equation
(M 100) x 225/150 = J 75 and solve to get 150
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A.  1 + x + y = 0 
B.   x  +  y  = 9 
C.  y=x^{3} 
D.  Both (a) & (b) 
Option: D Explanation :
lf the equation of the curve is unaltered, if x is replaced by y and y by x, then the curve will be symmetric about the line x = y.
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A. 
xincrement = 1 ; yincrement = 1

B. 
xincrement = 0.5; yincrement = 1

C.  xincrement = 1 ; yincrement = 0.5 
D.  none of the above 
Option: C Explanation :
x  increment = x2 x1 / max ((x2 x1), (y2  y1))
y  increment = y2 y1 / max ((x2 x1), (y2  yl))
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