Surface Area and Volume

1. Find the surface area of a chalk box whose length , breadth and height are 16cm , 8cm and 6cm .

• 544 sq cm

• 625 sq cm

• 728 sq cm

• 542 sq cm

A sphere , a cylinder and a cone are of the same radius and same height .Find the ratio of their curved surfaces.

• 3:4: $2\sqrt{2}$

• 4:4: $\sqrt{5}$

• 2:3:1

• 4:3:5

The diameter of a sphere is decreased by 25 percent . What is the decrease in curved surface area 

•  $\frac{7\pi^{ }r^2}{2}$  

•  $\frac{7\pi r^2}{3}$  

•  $\frac{7\pi r^2}{4}$  

•  $\frac{7\pi r^2}{6}$  

The area of the base of a right circular cylinder is 154 sq cm and its base is 15cm. Find the volume of the cylinder.

• 3450cubic cm

• 4250 cubic cm

• 1520 cubic cm

• 2310 cubic cm

The volume of a cylinder is  $448\pi$ cubic cm and height is 7cm. Find its lateral surface area.

• 352 sq cm 

• 452 sq cm 

• 572 sq cm 

• 784 sq cm