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Advice
Giggle. And, tell the interviewer there are probably a lot of reasons. You may mention that a round manhole cover allows people to work a little bit more quickly because they do not need to line up a shape to put the cover back on; since it's round, it will fit no matter how it is set back into place. A round manhole cover also will not fall through the hole. From a safety perspective, a shape with corners could be a hazard as people could cut/poke themselves on it. The round shape also makes the object easy to roll which means less chance for injury because people do not need to carry the object.
Answer examples
"Design aesthetics of course! (Just kidding!) A round manhole cover cannot fall through its circular openings, whereas a square cover can, if rotated. Circular covers also do not need to be rotated or aligned to close them up. Round covers are also easy to move or roll around."

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User-Submitted Answers

1.
Because shape of cover prevents from falling inside.
2.
Round had no edges, it will not hurt the man who entering the hole.
3.
Because humans don't fit down star-shaped holes as easily.
4.
To make it easier to lift. It can be rolled away from the opening instead of needing to be fully lifted off.
5.
A round manhole cover can not fall through its round opening.
6.
Because it makes it easier to lifted in case of cleaning.
7.
Circular covers don't need to be rotated or precisely aligned when placing them on the opening. A round manhole cover is easily moved and rolled.
8.
Because the hole is round.
9.
I think it denotes life is a circle.
10.
So it would match the street, people can see it.
11.
A circle is the most energy efficient shape, that is why wheels are round and why bubbles are naturally round.
12.
So it cannot fall through the hole which it covers.
13.
To prevent people from falling into it.
14.
I always thought they were square.
15.
So you can not open or fall through.
16.
So it does not fall into the hole.
17.
First, the manhole cover is designed to be round. Secondly, technically, the round manholes are more safer and convenient to remove and to return due to having no corners.
18.
For usability. Easy to fit, easy to handle, one person can roll and it can`t fall into the hole.
19.
Because if it is in other shapes it can be pushed inside when placed diagonally.
20.
So they can drive over it to get to Safeway.
21.
Because people are round.
22.
I am not sure but I can find that answer for you.
23.
A round cover will not fall through the manhole.
24.
It can be easyily accessed, while comaped to squaer and other as they no need to allign precise.
25.
I have never really considered that question, I would say to fit the type of round hole or piping it has to go on.
26.
Because it's safe that way.