Mensuration Test

Result

Mensuration Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The curved surface area of a right circular cone with base radius 2 cm and slant height 4 cm is

A
12π cm²

B
π/8 cm²

C
8π cm²

D
π/12 cm²

Solution

Base radius (r) of the cone = 2 cm
Slant height (l) of the cone = 4 cm
Curved surface area of the cone = πrl
= π × 2 cm × 4 cm
= 8π cm²
Question 2
1 / -0

The base radius of a cone is 8 cm and the slant height is 12 cm. Its total surface area is _____.

A
160π cm²

B
96π cm²

C
140π cm²

D
192π cm²

Solution

Given, base radius (r) of cone = 8 cm
Slant height of cone = 12 cm

Then, total surface area = πr (r + l)
= π8 (8 + 12)

= π8 (20)
= 160π cm²
Question 3
1 / -0

If the radius of a hemisphere is 5 cm, its curved surface area is _____.

A
75π cm²

B
100π cm²

C
25π cm²

D
50π cm²

Solution

Given, radius of hemisphere = 5 cm
Curved surface area of hemisphere = 2πr²
= 2π × (5)²
= 2π × 25
= 50π cm²