A hollow copper pipe is 22 cm long and its external diameter is 28 cm. If the thickness of the pipe is 3 cm and iron weighs 8.5 g/cm³ , then the weight of the pipe is closest to:

A solid metallic cylinder of base radius 3 cm. and height 5 cm. is melted to form cones, each of height 1 cm. and base radius 1 mm. The number of cones is -

The total surface area of a hemisphere is 166.32 sq cm, find its radius? 

The volume of a solid right circular cone is 600 π cm³, and the diameter of its base is 30 cm. The total surface area (in cm²) of the cone is:

The area of the base of a right circular cone is 400π and its height is 15 cm. The curved surface of the cone ( in cm²) is:

The curved surface area of a cylindrical pillar is $$ {264 m^{2}}$$ and its volume is $$ {924 m^{3}}$$. Find the ratio of its diameter to its height.

The diagonal of a square is 14 cm. What will be the length of the diagonal of the square whose area is double of the area of first square?

The total Surface area of a solid hemisphere is 1039.5 cm². The volume ( in cm³) of the hemisphere is: (Take π=22/7)