Q. What is known as a watertight enclosure made up of sheet pile walls, usually temporary, built around a working area for the purpose of excluding water during construction?

A
cofferdam
B
bulkhead
C
penstock
D
box caisson
Solution:

A cofferdam is a reasonably watertight enclosure, usually temporary, built around a working area in the midst of water for the purpose of excluding water from that enclosed area during construction.
A bulkhead is an upright wall within the hull of a ship or within the fuselage of an aeroplane. Other kinds of partition elements within a ship are decks and deckheads.

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