Question

The number of surfaces of a hollow cylindrical object is:

• A. $1$
• B. $2$
• C. $4$
• D. $3$

Answer 1

The correct option is C

$4$

Here, we need to count the number of surfaces of a hollow cylindrical object, and so for that we need to count the number of surfaces.

First, we will understand what is surface.

It is something which we can see and which we can touch. Even it is something which may not be hidden. Let's take an example of an empty glass of water/juice. As we can imagine, it has two surfaces one inner and another is the outer. Similarly, in this way, we can count the number of surfaces of any hollow cylindrical object too.

Thus, a hollow cylinder has a total of 4 surfaces:

a) inner curved surfaces

b) outer curved surfaces

c) the ring lies at the base of the cylinder and

d) the ring lies at the top of the cylinder

Lastly, a straw or a water tank and many more are the real life examples of the hollow cylinder.

Hence, a hollow cylindrical object has 4 surfaces.