Which term describes the backbone of a vessel?

Which term describes the backbone of a vessel?

• A. Mast
• B. Keel
• C. Hull
• D. Deck

Answer: (B)

The backbone of a vessel is the keel, the lengthwise structural member along the bottom that provides stiffness and alignment for the hull. It runs from bow to stern and acts as the main spine to which the frames (the ribs of the hull) are fastened. This keeps the hull true to shape, maintains structural integrity under load, and helps resist bending forces in waves. In some ships, the keel also serves as the ballast keel, adding weight low in the ship to improve stability. Mast is the vertical spar for sails, hull is the exterior shell forming the body of the ship, and deck is the upper horizontal platform. None of these serve as the ship’s central structural backbone.

The backbone of a vessel is the keel, the lengthwise structural member along the bottom that provides stiffness and alignment for the hull. It runs from bow to stern and acts as the main spine to which the frames (the ribs of the hull) are fastened. This keeps the hull true to shape, maintains structural integrity under load, and helps resist bending forces in waves. In some ships, the keel also serves as the ballast keel, adding weight low in the ship to improve stability.

Mast is the vertical spar for sails, hull is the exterior shell forming the body of the ship, and deck is the upper horizontal platform. None of these serve as the ship’s central structural backbone.