Class IX The volume of a sphere of radius r is obtained by multiplying its surface area by 1.333333333 r/3 4r/3 3r The cost of the paint is Rs. 36.50 per kg. If 1 kg of paint covers 16 square feet, then the cost to paint outside of a cube having 8 feet each side is Rs. 692 Rs. 768 Rs. 876 Rs. 972 A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then the volume of the iron used to make the tank is 0.06343 m³ 1.06343 m³ 1.06343 m³ 0.06686 m³ none of these If each edge of a cube is increased by 50% then the percentage increase in its surface area is 0.5 1 1.25 1.5 The edge of the cuboid are in the ratio 1 : 2 : 3 and its surface area is 88 cm2 . Then the volume of the cuboid is 24 cm³ 48 cm³ 64 cm³ 120 cm³ Do you really want to submit this quiz? Cancel Submit Quiz