81.  Consider the matrix representing a set of planar (2D) geometric transformations in homogeneous coordinates. Which of the following statements about the matrix M is True? 
a.  M represents first, a scaling of vector (2,1) followed by translation of vector (1,1) 
b.  M represents first, a translation of vector (1,1) followed by scaling of vector (2,1) 
c.  M represents first, a scaling of vector (3,1) followed by shearing of parameters (1,1) 
d.  M represents first, a shearing of parameters (1,1) followed by scaling of vector (3,1) 
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Answer: (b).M represents first, a translation of vector (1,1) followed by scaling of vector (2,1)

82.  Which of the following is not a component of Memory tube display? 
a.  Flooding gun 
b.  Collector 
c.  Ground 
d.  Liquid Crystal 
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Answer: (d).Liquid Crystal

83.  Which of the following is not true in case of Oblique Projections? 
a.  Parallel projection rays are not perpendicular to the viewing plane. 
b.  Parallel lines in space appear parallel on the final projected image. 
c.  Used exclusively for pictorial purposes rather than formal working drawings. 
d.  Projectors are always perpendicular to the plane of projection. 
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Answer: (d).Projectors are always perpendicular to the plane of projection.

84.  With respect to CRT, the horizontal retrace is defined as : 
a.  The path an electron beam takes when returning to the left side of the CRT. 
b.  The path an electron beam takes when returning to the right side of the CRT. 
c.  The technique of turning the electron beam off while retracing. 
d.  The technique of turning the electron beam on/off while retracing. 
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Answer: (a).The path an electron beam takes when returning to the left side of the CRT.

85.  Find the equation of the circle x^2+y^2=1 in terms of x'y' coordinates, assuming that the xy coordinate system results from a scaling of 3 units in the x' direction and 4 units in the y' direction. 
a.  3(x')^2 + 4(y')^2 = 1 
b.  (x'/3)^2 + (y'/4)^2 = 1 
c.  (3x')^2 + (4y')^2 = 1 
d.  1/3(x')^2 + 1/4(y')^2 = 1 
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Answer: (b).(x'/3)^2 + (y'/4)^2 = 1

86.  Find the normalization transformation that maps a window whose lower left corner is at (1, 1) and upper right corner is at (3, 5) onto a viewport that is the entire normalized device screen. 
a.  1 
b.  2 
c.  3 
d.  4 
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Answer: (a).1
