PROJECTION OF SECTIONED SOLIDS AND
DEVELOPMENT OF SURFACES
BASICS OF SECTION OF SOLIDS
- 1.To understand some of the hidden
geometry of components an imaginary plane
is used to cut the object which is called
a) auxiliary plane
b) picture plane
c) section plane
d) additional plane
Answer: c
Explanation: To understand some of the hidden geometry of components an imaginary plane is used to cut the object which is called section plane or cutting plane. The new imaginary face generated on the object iscalled the section.
- 2.Which of the following is not the purpose
of using cutting (section) plane?
a) Interpretation of object
b) Visualizing of object
c) Cutting the objects
d) Invisible features
Answer: c
Explanation: Section plane or cutting plane
is an imaginary plane which is used to cut the
object to visualize the geometry which is
hidden inside the object and interpret it which
plays an important role in designing many
machine parts.
- 3.To find the true shape of the section, it
must be projected on a plane parallel to the
a) Profile plane
b) Vertical plane
c) Auxiliary plane
d) Section plane
Answer: d
Explanation: As we know true shape and
size is obtained only when an object is
projected on to the plane parallel to it.
Likewise, as section always be plane surface
to know its true shape it should be project
- 4.The type of line used to represent the
cutting plane in drawing is.
Answer: c
Explanation: Continuous thick line is used for visible out-lines, dashed lines are used for line showing permissible surface treatment, long-dashed dotted lines are used for indication of surfaces for which a special requirement applies.
line showing permissible surface treatment,
long-dashed dotted lines are used for
indication of surfaces for which a special
requirement applies.
- 5.A section plane is parallel to V.P the top
view gives which is
to xy line.
a) true shape, parallel
b) straight line, parallel
c) straight line, perpendicular
d) true shape, perpendicular
Answer: b
Explanation: The projection of section plane
on the plane to which it is perpendicular gives
a straight line which is parallel,
perpendicular, inclined as due to section if it
is parallel, perpendicular, inclined to
reference planes. - 6.The projection of a section plane, on the
plane to which it is perpendicular is a straight
line.
a) True
b) False
Answer: a
Explanation: The projection of a section
plane, on the plane to which it is
perpendicular is a straight line. The projection
of a section on the reference plane to which
the section plane is perpendicular will be a
straight line coinciding with the trace of the
section plane of it. - 7.The projection of section surface on the
other plane to which it is inclined is called
auxiliary section.
a) True
b) False
Answer: b
Explanation: No it is not auxiliary plane but
apparent section. This is obtained by
projecting on the other plane, the points at
which the trace of the section plane intersects
the edges of the solid and drawing lines
joining these points in proper sequence. - 8.The section plane is perpendicular to H.P
and inclined to V.P the front view of section if
section is a line. It xy line.
a) is perpendicular to
b) is parallel to
c) is inclined to V.P
d) crosses
Answer: b
Explanation: The projection of section plane
on the plane to which it is perpendicular gives
a straight line. It is given the section is line
and also from front view the section lies
parallel to xy reference line. - 9.The section plane is perpendicular to H.P
and inclined to V.P the top view of section if
section is a line. It xy line.
a) is perpendicular to
b) is parallel to
c) is inclined to V.P
d) crosses
Answer: c
Explanation: The projection of section plane
on the plane to which it is perpendicular gives
a straight line. Here it is given section plane is
inclined with V.P so top view gives a line
inclined to xy reference line. - 10.A section is perpendicular to both the
reference planes the true shape and size is
obtained by taking projection of section on to
plane.
a) horizontal
b) vertical
c) profile
d) auxiliary
Answer: c
Explanation: Given the section is perpendicular to both horizontal and vertical plane that is it is parallel to profile plane which is otherwise called as picture plane. Always remember the true shape and size will be trace if projections are drawn on to the plane parallel to section plane.
- 11.A section is parallel to horizontal plane
the true shape and size is obtained by taking
projection of section on to plane.
a) horizontal
b) vertical
c) profile
d) auxiliary
Answer: a
Explanation: Always remember the true
shape and size will be trace if projections are
drawn on to the plane parallel to section
plane. So here as the section is parallel to
horizontal plane the projection is to be taken
on horizontal plane. - 12.A section is parallel to vertical plane the
true shape and size is obtained by taking
projection of section on to plane.
a) horizontal
b) vertical
c) profile
d) auxiliary
Answer: b
Explanation: Always remember the true
shape and size will be trace if projections are
drawn on to the plane parallel to section
plane. So here as the section is parallel to a
vertical plane the projection is to be taken on
vertical plane.
SECTIONS OF PRISMS
- 1.A regular triangular prism is resting on H.P
and section plane is parallel to H.P and
cutting the prism the section would be a
a) triangle
b) rectangle
c) trapezium
d) parallelogram
Answer: b
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same cross-section along the length perpendicular to axis.
If the cutting plane parallel to axis we get
rectangle. - 2.A cube is rested on H.P on one of its base
such that base’s diagonal is perpendicular to
V.P and section plane is parallel to V.P the
section will be a
a) triangle
b) rectangle
c) trapezium
d) parallelogram
Answer: b
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same crosssection along the length perpendicular to axis.
If the cutting plane parallel to axis we get
rectangle. - 3.A cube is rested on H.P on one of its base
such that base’s diagonal is perpendicular to
V.P and section plane is making 45 degrees
with both H.P and V.P and section plane is
not intersecting more than 3 edges the section
will be a
a) triangle
b) rectangle
c) trapezium
d) parallelogram
Answer: a
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there will be same
cross-section along the length perpendicular
to axis. If the cutting plane is parallel to axis
we get rectangle if inclined to axis the section
depends on the position where it is cutting.
- 4.A cube is rested on H.P on one of its base
such that base’s diagonal is perpendicular to
V.P and section plane is making 45 degrees
with V.P and perpendicular to H.P the section
will be a
a) triangle
b) rectangle
c) trapezium
d) parallelogram
Answer: b
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same crosssection along the length perpendicular to axis.
If the cutting plane parallel to axis we get
rectangle. - 5.A cube is placed on H.P on its base and
vertical face is making 30 degrees with V.P,
section plane is perpendicular to V.P the
section will give a shape of a
a) triangle
b) rectangle
c) trapezium
d) parallelogram
Answer: c
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there will be same
cross-section along the length perpendicular
to axis. If the cutting plane is parallel to axis
we get rectangle if inclined to axis the section
depends on the position where it is cutting. - 6.A square prism has its base on H.P and its
faces equally inclined to V.P is cut at most
critical place by a plane which is
perpendicular to V.P and inclined 60 degrees
with H.P the section will have shape like a
a) irregular pentagon
b) rectangle
c) trapezium
d) parallelogram
Answer: a
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there will be same
cross-section along the length perpendicular
to axis. If the cutting plane is parallel to axis
we get rectangle if inclined to axis the section
depends on the position where it is cutting. - 7.A triangular prism resting on one of its
longest faces on H.P and axis of prism is
parallel to V.P, the section plane is
perpendicular to both V.P and H.P the section
will be a
a) triangle
b) rectangle
c) trapezium
d) parallelogram
Answer: a
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same crosssection along the length perpendicular to axis.
If the cutting plane parallel to axis we get a
rectangle. - 8.A pentagonal prism resting on one of its
longest faces on H.P and axis of prism is
parallel to V.P, the section plane is
perpendicular to both V.P and H.P the section
will be a
a) pentagon
b) irregular pentagon
c) rectangle
d) trapezium
Answer: a
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same cross-section along the length perpendicular to axis.
If the cutting plane parallel to axis we get a
rectangle. - 9.A pentagonal prism resting on one of its longest faces on H.P and axis of prism is parallel to V.P, the section plane is parallel to both V.P/ H.P the section will be a
a) pentagon
b) irregular pentagon
c) rectangle
d) trapezium
Answer: c
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same crosssection along the length perpendicular to axis.
If the cutting plane parallel to axis we get a
rectangle.
10.10.A hexagonal prism is resting on H.P on
one of its longest faces, axis is perpendicular
to V.P the section plane is parallel to V.P and
perpendicular to H.P. The section will be like a
a) hexagon
b) irregular hexagon
c) rectangle
d) trapezium
Answer: a
Explanation: Prisms are obtained by
extruding required shape up to some
appreciable length so there exist same crosssection along the length perpendicular to axis.
If the cutting plane parallel to axis we get a
rectangle.
SECTIONS OF PYRAMIDS
- 1.A square pyramid is placed on V.P with
square as base on V.P the cutting plane is
parallel to H.P and also parallel to one edge
of base, the section will be
a) triangle
b) rectangle
c) square
d) trapezium
Answer: d
Explanation: If a pyramid is cut by a plane
parallel to axis and also parallel to any edge
of base then the section formed will be
trapezium if the section plane not parallel to
edge of base then the section will be triangle. - 2.A square pyramid is placed on V.P with
square as base on V.P the cutting plane is
parallel to V.P, the section will be
a) triangle
b) rectangle
c) square
d) pentagon
Answer: c
Explanation: If a pyramid is cut by a plane
perpendicular to its axis section gives the
base shape or parallel to axis and also parallel
to any edge of base then the section formed
will be trapezium if the section plane not
parallel to edge of base then the section will
be triangle. - 3.A pentagon pyramid is placed on V.P with
square as base on V.P the cutting plane is
parallel to H.P and parallel to edge of base,
the section will be
a) triangle
b) rectangle
c) trapezium
d) pentagon
Answer: c
Explanation: If a pyramid is cut by a plane
parallel to axis and also parallel to any edge
of base then the section formed will be
trapezium if the section plane not parallel to
edge of base then the section will be triangle. - 4.A pentagon pyramid is placed on V.P with
square as base on V.P the cutting plane is
perpendicular to H.P and inclined to V.P and
the section is cutting the whole cross-section,
the section will be
a) triangle
b) trapezium
c) irregular square
d) irregular pentagon
Answer: d
Explanation: Given a regular pentagonal
pyramid it may of any size having any
distances in between them if a section plane
cutting the solid inclined to its base and
completely cutting the solid the section
formed will be irregular base shape. - 5.A pentagon pyramid is placed on V.P with
square as base on V.P the cutting plane is
perpendicular to H.P and inclined to V.P and
the section is cutting not more than 3 edges,
the section will be
a) triangle
b) trapezium
c) irregular square
d) irregular pentagon
Answer: a
Explanation: : If a pyramid is cut by a plane
perpendicular to its axis section gives the
base shape or parallel to axis and also parallel
to any edge of base then the section formed
will be trapezium if the section plane not
parallel to edge of base then the section will
be a triangle.
- 6.A square pyramid is placed on H.P on its
square base and section plane is perpendicular
to V.P and inclined to H.P cutting given solid
in such a way that the perpendicular distance
from the ends of section to axis is same. The
section will be
a) square
b) triangle
c) irregular pentagon
d) rhombus
Answer: d
Explanation: Given a square pyramid it may
of any size having any distances in between
them if a section plane cutting the solid
coincides with base edge and cutting pyramid
gives a irregular square and similar to other
based pyramids also. - 7.A square pyramid is placed on H.P on its
square base and section plane is perpendicular
to V.P and parallel to H.P and cutting the
solid. The section will be
a) square
b) triangle
c) irregular pentagon
d) rhombus
Answer: a
Explanation: If a pyramid is cut by a plane
perpendicular to its axis section gives the
base shape or parallel to axis and also parallel
to any edge of base then the section formed
will be trapezium if the section plane not
parallel to edge of base then the section will
be a triangle. - 8.A square pyramid is placed on H.P on its
square base and section plane is parallel to
V.P and not parallel to edge of base is cutting
the solid. The section will be
a) square
b) triangle
c) irregular pentagon
d) trapezium
Answer: b
Explanation: If a pyramid is cut by a plane
parallel to axis and also parallel to any edge
of base then the section formed will be
trapezium if the section plane not parallel to
edge of base then the section will be triangle. - 9.A regular pentagonal pyramid of base side
equal to 5 cm is resting on H.P on its
pentagon face and section plane is parallel to
axis and parallel to edge of base and plane is
2 cm away from axis. The section will be
a) triangle
b) trapezium
c) rectangle
d) pentagon
Answer: b
Explanation: If a pyramid is cut by a plane
parallel to axis and also parallel to any edge
of base then the section formed will be
trapezium if the section plane not parallel to
edge of base then the section will be triangle. - 10.A regular pentagonal pyramid of base side
equal to 5 cm is resting on H.P on its
pentagon face and section plane is
perpendicular to axis. The section will be
a) triangle
b) trapezium
c) rectangle
d) pentagon
Answer: d
Explanation: If a pyramid is cut by a plane
perpendicular to its axis section gives the
base shape or parallel to axis and also parallel
to any edge of base then the section formed
will be trapezium if the section plane not
parallel to edge of base then the section will
be triangle.
SECTIONS OF CYLINDERS
- 1.A cylinder is placed on H.P on its base and
section plane is parallel to V.P cutting the
solid the section gives
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: c
Explanation: Cylinder is formed by rotating
the rectangle about one of its sides which is
said to axis further. So if the cutting plane is
parallel to axis the section formed is rectangle
and if plane is perpendicular to axis it gives
circle. - 2.A cylinder is placed on H.P on its base and
section plane is parallel to H.P cutting the
solid the section gives
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: b
Explanation: Cylinder is formed by rotating
the rectangle about one of its sides which is
said to axis further. So if the cutting plane is
parallel to axis the section formed is rectangle
and if plane is perpendicular to axis it gives
circle. - 3.A cylinder is placed on H.P on its base and
section plane is inclined to V.P and
perpendicular to H.P cutting the solid the
section gives
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: c
Explanation: Cylinder is formed by rotating
the rectangle about one of its sides which is
said to axis further. So if the cutting plane is
parallel to axis the section formed is rectangle
and if plane is perpendicular to axis it gives
circle.
- 4.A cylinder is placed on H.P on its base and
section plane is inclined to H.P and
perpendicular to V.P cutting only less than
half of the generators of the solid the section
gives
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: a
Explanation: If a cylinder is been cut by
plane which is inclined to base or axis if it
cuts all the generator the section formed will
be ellipse and if the plane cuts less than half
of generators the section formed will be
parabola. - 5.A cylinder is placed on V.P on its base and
section plane is inclined to V.P and
perpendicular to H.P cutting all the generators
of the solid the section gives
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: d
Explanation: If a cylinder is been cut by
plane which is inclined to base or axis if it
cuts all the generator the section formed will
be ellipse and if the plane cuts less than half
of generators the section formed will be
parabola. - 6.A cylinder is placed on V.P on its base and
section plane is inclined to H.P and
perpendicular to V.P cutting the solid the
section gives
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: c
Explanation: Cylinder is formed by rotating
the rectangle about one of its sides which is
said to axis further. So if the cutting plane is
parallel to axis the section formed is rectangle
and if plane is perpendicular to axis it gives
circle. - 7.A cylinder is been cut by a plane parallel to
its base the section will be
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: b
Explanation: Cylinder is formed by rotating
the rectangle about one of its sides which is
said to axis further. So if the cutting plane is
parallel to axis the section formed is rectangle
and if plane is perpendicular to axis it gives
circle. - 8.A cylinder is been cut by a plane parallel to
axis the section will be
a) parabola
b) circle
c) rectangle
d) ellipse
Answer: c
Explanation: Cylinder is formed by rotating
the rectangle about one of its sides which is
said to axis further. So if the cutting plane is
parallel to axis the section formed is rectangle
and if plane is perpendicular to axis it gives
circle.
SECTIONS OF CONES
- 1.A regular cone is placed on V.P on its base
a section plane is parallel to H.P and section
plane is 2cm away from the axis the section will be
a) ellipse
b) hyperbola
c) circle
d) triangle
Answer: b
Explanation: If a cone made to cut by a plane
parallel to its axis and some distance away
from it the section formed is hyperbola. If the
section plane is perpendicular to axis the
section is circle. If section plane passes
through apex the section formed is a triangle.
- 2.A regular cone is placed such that axis is
perpendicular to H.P and the section plane is
inclined to axis and parallel to one of the
generator then the section will be
a) ellipse
b) hyperbola
c) parabola
d) triangle
Answer: c
Explanation: If a regular cone is been cut by
plane which is inclined to axis of cone and
cutting all generators then the section formed
will be ellipse and if section plane is inclined
with axis with angle less than half of the
angle between the slanting ends then section
formed is a parabola. - 3.A regular cone is placed such that axis is
parallel to both reference planes the section
plane perpendicular to both reference planes
and cuts the cone the section will be like
a) ellipse
b) hyperbola
c) circle
d) triangle
Answer: c
Explanation: If a cone made to cut by a plane
parallel to its axis and some distance away
from it the section formed is hyperbola. If the
section plane is perpendicular to axis the
section is circle. If section plane passes
through apex the section formed is a triangle. - 4.A regular cone is placed on H.P and
section plane is parallel to axis cutting the
cone at the middle then the section will be
a) ellipse
b) hyperbola
c) circle
d) triangle
Answer: d
Explanation: If a cone made to cut by a plane
parallel to its axis and some distance away
from it the section formed is hyperbola. If the
section plane is perpendicular to axis the
section is circle. If section plane passes
through apex the section formed is a triangle. - 5.A regular cone is been cut by a cutting
plane which passes through the apex of cone
and making some angle with axis less than
half of angle between the slanting ends the
section will be like
a) ellipse
b) hyperbola
c) circle
d) triangle
Answer: d
Explanation: If a cone made to cut by a plane
parallel to its axis and some distance away
from it the section formed is hyperbola. If the
section plane is perpendicular to axis the
section is circle. If section plane passes
through apex the section formed is a triangle
SECTIONS OF SPHERES
- 1.A sphere is placed on H.P and section
plane is parallel to H.P the section is circle
and if the section plane is parallel to V.P the
section is again circle.
a) True
b) False
Answer: a
Explanation: When a sphere is cut by a
plane, the true shape of the section is always a
circle. But here asked are views so it will be
lines or ellipse according to section plane
however the section plane will lay section
will be circle. - 2.If a sphere is made to cut by a plane which
is inclined to V.P when circle is on H.P the
section formed will be an ellipse.
a) True
b) False
b) ellipse, circle
c) line, ellipse
d) line, circle
Answer: d
Explanation: When a sphere is cut by a
plane, the true shape of the section is always a
circle. But here asked are views so it will be
lines or ellipse according to section plane
however the section plane will lay section
will be circle. - 3.A sphere is placed on V.P the section plane
perpendicular to H.P and inclined to V.P
cutting the sphere section formed and front
view will be
a) circle, line
b) circle, circle
c) ellipse, circle
d) circle, ellipse
Answer: d
Explanation: When a sphere is cut by a
plane, the true shape of the section is always a
circle. But here asked are views so it will be
lines or ellipse according to section plane
however the section plane will lay section
will be circle.
- 5.A hemi sphere is placed on H.P on its base
a section plane which is perpendicular to H.P
and inclined to V.P and cutting the
hemisphere the section will be
a) circle
b) ellipse
c) sector
d) segment
Answer: d
Explanation: Hemisphere is the half sphere.
When a hemisphere is made to cut by a plane
parallel to base the section formed will be
circle. If the plane is inclined to base the
section formed will be segment.
DEVELOPMENT OF SURFACES
- 1.Which method of development is
employed in case of prisms?
a) Parallel-line development
b) Approximation method
c) Triangulation development
d) Radial-line development
Answer: a
Explanation: Parallel-line method is
employed in case of prisms and cylinders in
which stretch out-line principle is used.
Radial-line development is used for pyramids
and cones in which the true length of the slant
edge or the generator is used as a radius. - 2.Which method of development is
employed in case of cones?
a) Parallel-line development
b) Approximation method
c) Triangulation development
d) Radial-line development
Answer: d
Explanation: Parallel-line method is
employed in case of prisms and cylinders in
which stretch out-line principle is used.
Radial-line development is used for pyramids
and cones in which the true length of the slant
edge or the generator is used as a radius. - 3.Which method of development is
employed in case of double curved objects?
a) Parallel-line development
b) Approximation method
c) Triangulation development
d) Radial-line development
Answer: b
Explanation: Approximation method is used
to develop objects of double curved or
warped surfaces as sphere, paraboloid,
ellipsoid, hyperboloid and helicoid.
Triangulation method is used for transition
pieces. This is simply a method of dividing a
surface into number of triangles and
transferring them into the development. - 4.4.Which method is used to develop transition
pieces?
a) Parallel-line development
b) Approximation method
c) Triangulation development
d) Radial-line development
Answer: c
Explanation: Approximation method is used
to develop objects of double curved or
warped surfaces as sphere, paraboloid,
ellipsoid, hyperboloid and helicoid.
Triangulation method is used for transition
pieces. This is simply a method of dividing a
surface into number of triangles and
transferring them into the development.
- 5.Which method of development is
employed in case of sphere, ellipsoid?
a) Parallel-line development
b) Approximation method
c) Triangulation development
d) Radial-line development
Answer: b
Explanation: Approximation method is used
to develop objects of double curved or
warped surfaces as sphere, paraboloid,
ellipsoid, hyperboloid and helicoid.
Triangulation method is used for transition
pieces. This is simply a method of dividing a
surface into number of triangles and
transferring them into the development. - 6.Developments of the lateral surface of a
prism consist of the same number of
in contact as the number of the
sides of base of the prism.
a) squares
b) rectangles
c) triangles
d) parallelograms
Answer: b
Explanation: Developments of the lateral
surface of a prism consist of the same number
of rectangles in contact as the number of the
sides of base of the prism. One side of the
rectangle is equal to the length of the axis and
the other side equal to the length of the side
of the base.
- 7.The development of lateral surface of a
pyramid consists of a number of equal
triangle in contact.
a) equilateral
b) isosceles
c) scalene
d) right angled
Answer: b
Explanation: The development of lateral
surface of a pyramid consists of a number of
equal isosceles triangles in contact. The base
and sides of each triangle are respectively
equal to the edge of the base and slant edge of
the pyramid.
INTERSECTION OF SURFACES
- 1.The surfaces of which intersect one another
in lines which are called line of intersection.
a) True
b) False
Answer: a
Explanation: In engineering practice, objects
constructed may have constituent parts, the
surfaces of which intersect one another in line
which are called line of intersection. A dome
fitted on a boiler is one such example. The
surface of the dome extends up to the line of
intersection only.
and between a plane surface and curved
surfaces is a
a) straight line, curve, curve
b) straight line, straight line, curve
c) straight line, curve, straight line
d) curve, curve, curve
3.Which method of development is - employed in case of double curved objects? The plane surfaces (faces of
prisms and pyramids) intersect in a straight
line. The line of intersection between two
curved surfaces (of cylinders and cones) or
between a plane surface and curved surfaces
is a curve. - 2.Drawing straight lines on both the surfaces
of solids and then pointing the points where
they intersect and drawing lines which forms
the line of intersection this process of finding
the line of intersection is termed as
method.
a) assumption
b) line
c) removing material
d) cutting- plane
Answer: b
Explanation: A number of lines are drawn on
the lateral surface of one of the solids and in
the region of the line of intersection. Points of
intersection of these lines with the surface of
the other solid are then located. These points
will obviously lie on the required line of
intersection. - 4.
a) assumption
b) line
c) removing material
d) cutting- plane
Answer: d
Explanation: The two solids are assumed to
be cut by a series of cutting planes. The
cutting planes may be vertical, edgewise or
oblique. The cutting planes are so selected as
to cut the surface of one of the solids in
straight lines and that of the other in straight
lines or circle.
- 5.The line of intersection formed is curve
while two solids are intersecting the solids
may be
a) cylinder, sphere
b) prism, prism
c) cuboid, cube
d) prism, pyramid
Answer: a
Explanation: If any of the solid in two of
intersecting solids is having curves surface
that is cylinder, cone, sphere etc the line of
intersection will give curve only but not
straight line for getting line of intersection
straight line both the solids should not have
curved surfaces.
