30 circular plates, each of rdius 14 cm and thickness 3 cm are placed in one above the another to form a cylindrical solid. Find
volume of the cylinder so formed.

30 circular plates, each of rdius 14 cm and thickness 3 cm are placed in one above the another to form a cylindrical solid. Find the total surface area.

50 circular plates each of radius 7 cm and 1 thickness 1/2 cm are placed one above another to form a solid right circular cylinder. Find the total surface area and volume of the cylinder so formed.

A rectangular sheet of paper of dimensions 30 cmxx16 cm can be transformed into an open ended cylinder in two ways. Find the ratio of volumes of two cylinders thus formed.

The base radius and height of a right circular solid cone are 2 cm and 8 cm respectively. It is melted and recast into spheres of diameter 2 cm each. Find the number of spheres so formed.

Three cubes each with 2 cm edge are placed side by side to form a cuboid. Sketch an oblique or isometric sketch of this cuboid

A rectangular sheet of paper 30cmx×18cm can be transformed into the curved surface of a right circular cylinder in two ways namely, either by rolling the paper along its length or by rolling it along its breadth. Find the ratio of the volumes of the two cylinders, thus formed.

An object is placed 30 cm in front of a plano-convex lens with its spherical surface of radius of curvature 20 cm. If the refractive index of the material of the lens is 1.5, find the position and nature of the image formed.

A solid consisting of a right circular cone of height 120 cm and radius 60 cm standing on a hemisphere of radius 60 cm is placed uprightina right circular cylinder full of water such that it touches the bottom..Find the volume of water left in the cylinder, if the radius of the cylinder is 60 cm and its height is 180 cm

A right circular with sides 6cm, 8cm and10 cm is revolved about the side 8 cm. find the volume and the curved surface area of the solid so formed.

The internal and external diameters of a hollow hemispherical shell are 6 cm and 10 cm respectively.It is melted and recast into a solid cone of base diameter 14 cm. Find the height of the cone so formed