Question

Manhole covers are made circular:

• A. to strengthen cover
• B. to make the entry convenient
• C. for architectural reasons
• D. to prevent falling of the cover into the manhole

Hint:

Circular objects have uniform diameter, making them safest for covering circular openings like manholes.

Answer 1

The Correct Option is D

Step 1: Understanding manhole design.
Manholes provide access to underground sewer lines for inspection and maintenance. The cover design is crucial for safety and functionality.
Step 2: Reason for circular shape.
A circular cover cannot fall through its opening regardless of its orientation, unlike square or rectangular covers which can slip diagonally.
Step 3: Analyzing the options.
(A) Incorrect, strength is not the main reason.
(B) Incorrect, entry convenience is unrelated to shape.
(C) Incorrect, architectural aesthetics are not the priority.
(D) Correct, circular shape prevents accidental falling into the manhole.
Step 4: Conclusion.
Manhole covers are circular primarily to prevent falling of the cover into the manhole.