Surface areas and volumes

The formula to find surface area of a cuboid of length (l), breadth (b) and height (h) is:

• lb+bh+hl

• 2(lb+bh+hl)

• 2(lbh)

• lbh/2

The surface area of cuboid-shaped box having length=80 cm, breadth=40cm and height=20cm is:

• 11200 sq.cm

• 13000 sq.cm

• 13400 sq.cm

• 12000 sq.cm

If the radius of a cylinder is 4cm and height is 10cm, then total surface area of cylinder is:

• 440 sq.cm

• 352 sq.cm.

• 400 sq.cm

• 412 sq.cm

The curved surface area of a right circular cylinder of height 14 cm is 88 cm2. The diameter of the base is:

• 2cm

• 3cm

• 4cm

• 6cm

The surface area of a sphere of radius 14 cm is:

• 1386 sq.cm

• 1400 sq.cm

• 2464 sq.cm

• 2000 sq.cm

The length, breadth and height of a room are 12 m, 10 m, and 9m respectively. Find the area of four walls of room?

• 636 m²

• 516 m²

• 800 m²

• 456m²

Find the maximum length of the rod that can be kept in cuboidal box of sides 30cm, 20cm and 10cm.

• √1400

• 2√400

• 2√300

• None of these

Formula for curved surface area of cylinder

• $2\pi r^2h$

• $2\pi rh$

• $2\pi r^2h$

• $2\pi r$

slant height,  $l=$  

•  $r+h$  

•  $r^2+h^2$  

•  $\sqrt{r+h}$  

•  $\sqrt{r^2+h^2}$  

Formula for calculating total surface area of cone is

• $\pi r\left(l+r\right)$

• $2\pi\left(l+r\right)$

• $2\pi\left(h+r\right)$

• $\pi\left(l+r\right)h$