The lateral surface area of frustum of a right circular cone, if the area of its base is 16∏ cm² and the diameter of circular upper surface is 4 cm and slant height 6 cm, will be

A solid cylinder has the total surface area 231 sq. cm. If its curved surface area is 2/3 of the total surface area, then the volume of the cylinder is

A rectangular water tank is 80 m x 40 m. Water flows into it through a pipe of 40 sq.cm at the opening at a speed of 10 km/hr. The water level will rise in the tank in half an hour is

A hemispherical bowl of internal radius 9 cm, contains a liquid. This liquid is to filled into small cylindrical bottles of diameter 3 cm and height 4 cm. Then the number of bottles necessary to empty the bowl is

The amount of concrete required to build a concrete cylindrical pillar whose base has a perimeter 8.8 metre and curved surface area 17.6 sq. metre, is (Take n = 22/7)

Four circles of equal radii are described about the four corners of a square so that each touches two of the other cirlces. If each side of the square is 140 cm then area of the space enclosed between the circumference of the circle is (take n = 22/7)