**111. A circle, if scaled in only one dimension becomes a/an**

A. parabola

B. hyperbola**C. ellipse**

D. remains a circle

**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.**

**112. 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 circle passing through the three points.

C. it is impossible to draw a circle passing through the three points

D. none of the above

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

**113. 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**

**114. The best hidden surface removal algorithm is**

A. painters

B. depth buffer

C. area subdivision**D. depends on the application**

**115. Engineering drawing commonly applies**

A. oblique projection**B. orthographic projection**

C. perspective projection

D. none of the above

**116. The basic elements of a picture in volume graphics is**

A. pixel

B. volsel**C. voxel**

D. none of the above

**117. The point at which a set of projected parallel lines appear to converge is called as a**

A. convergence point**B. vanishing point**

C. point of illusion

D. point of delusion

**118. In displaying a clipped picture, the efficient method is**

A. clipping against the window and then applying the window transformation

B. applying window transformation and then clipping against the viewport

C. both (a) and (b) have the same efficiency**D. efficiency depends on whether the window is an aligned rectangle or not.**

**119. A viewgraph is****A. an oversized slide designed for presentation on an overhead projector.**

B. designed and created by exposing film to the output of the graphics system.

C. a hardcopy chart

D. none of the above

**120. The best suited hidden surface algorithm to deal with non polygonal, non planar surface patches is**

A. painter’s algorithm

B. ray tracing**C. Z-Buffer algorithm**

D. scan-line algorithm