66.
The height of a closed cylinder of given volume and the minimum surface area is :

67.
Water is poured into an empty cylindrical tank at a constant rate for 5 minutes. After the water has been poured into the tank. the depth of the water is 7 feet. The radius of the tank is 100 feet. Which of the following is the best approximation for the rate at which the water was poured into the tank ?

68.
The curved surface of a right circular cone of height 15 cm and base diameter 16 cm is :

69.
A right circular cone and a right circular cylinder have equal base and equal height. If the radius of the base and the height are in the ratio 5 : 12, then the ratio of the total surface area of the cylinder to that of the cone is :

70.
The curved surface area of a sphere is 5544 sq.cm. Its volume is :

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