A square prism has square oppposite faces and either rectangular or square lateral faces. Hence, it is also known as either cuboid or cube.

Sphere doesn’t have any vertices and flat faces. The surface of the sphere is completely curved.

Answer: Option A. ->

Front view of the given figure is shown below.

The two bases of a prism are its two congruent opposite faces. Hence, a prism standing on its base will always have the same top and bottom views. In the following prism standing on its base,

the top view and the bottom view will be the same, which is the following:

Answer: Option A. ->

Front view

Answer: Option B. ->

This figure is not a convex polyhedron. A polyhedron is said to be convex if its surface (comprising its faces, edges and vertices) does not intersect itself and the line segment joining any two points of the polyhedron is contained in the interior or surface.

In the given figure of a cylinder, the portion that will be seen in the front view is colored in green. From the front, it will be seen as a rectangle.

A polyhedron is a three-dimensional solid figure in which each side is a flat surface. These flat surfaces are polygons and are joined at their edges. Since cylinder and cone are the solids that have curved surfaces, they are called non-polyhedrons. On the other hand, cube and prism are polyhedrons.

In the above figure, l is the slant height, h is the height and r is the radius. h and r are perpendicular to each other. So, h r and l forms a right angled triangle.
When we rotate the triangle about one of its perpendicular sides, then the shape obtained will be a cone as illustrated in the figure.