Surface Areas

For a cube having each edge 'a' units, lateral surface area is

For a cuboid of length 'l' breadth 'b' and height 'h' lateral surface area is

Total Surface Area of a Cylinder is

Surface area of cylinder = 2 x area of ______ + 1 x area of _______.

• circle; triangle

• rectangle; circle

• circle; rectangle

A rectangular sheet of paper 40 cm × 22 cm, is rolled to form a hollow cylinder of height 40 cm. The radius of the cylinder (in cm) is

• 7

• 3.5

• 5

If the lateral area of a cylinder of radius 13 cm and height 21 cm is to be covered with paper, then the area of the paper required is

• 1588 sq cm

• 3210 sq cm

• 2345 sq cm

• 1716 sq cm

The Curved surface area of a right circular cylinder is 4.4 sq.cm. The radius of the base is 0.7 cm. The height of the cylinder will be:

• 2 Cm

• 3 Cm

• 1 Cm

• 1.5 Cm

The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratio of the surface areas of the balloon in the two cases is

• 1:4

• 1:3

• 2:3

• 2:1

The total surface area of a cube is 96 cm². The volume of the cube is:

• 8 cm³ 

• 512 cm³

• 64 cm³

• 27 cm³

If the radius of a sphere is doubled, then what is the ratio of their surface area?

• 1 : 2

• 2 : 1

• 1 : 4

• 4 : 1