A rectangular block of wood having dimensions 3m*2m*1.75m has to be panted in all its faces.The layer of paint must be 0.1mm thick.Paint comes in cubical boxes having their edges equal to 10cm.The minimum number of boxes of paint to be purchased is

The last digit in the expansion of 17^256

The total surface area of a right circular cone of height 24cm with a hemisphere of radius 7cm upon its base is π

Water flows through cylindrical pipe of internal diameter 7cm at the rate of 5m/s.The time,in minutes,the pipe would take to fill an empty rectangular tank 4m*3m*3.1m is

The radius of a sphere is equal to radius of the base of a right circular cone,and the volume of sphere is double the volume of cone.The ratio of height of cone to radius of the base is

A sphere and a cube have the same surface area.The ratio of square of their volumes is π