5. The cone with vertex ( 0,0,0 ) and the base circle y = 2,    is  _________.

6. The section of a right circular cone by any plane perpendicular to its axis is a  _______.

plane
circle
conic
straight line

7. The  equation of a cone  which passes through the axis  is _______.

f yz + g zx + h xy=0.

f yz + g zx + h xy=1.         

8.If hen the equation   represents a  _______.

pair of planes
cylinder
cone
sphere

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