NAVAL SCIENCE 2 - 2ND SEM - EOC TEST

What is the portion of the ship called that lies above water from the waterline to the gunwales?

• buoyancy

• buoyant force

• center of gravity

• freeboard

Which identifies that area on a ship below the freeboard and above where water is displaced?

• a ship’s center of gravity

• a ship’s forecastle

• a ship’s quarterdeck

• a ship’s waterline

Which BEST describes why a 20,000 ton ship does NOT sink?

• The ship’s apparent weight alone determines whether or not it sinks

• The buoyant force from the body of water counteracts the weight of the ship, thereby preventing it from sinking

• The ship’s density and speed of motion are two factors that contribute to its seaworthiness and prevent it from sinking.

• The ship’s superstructure is positioned such that its center of gravity prevents it from sinking

What term is used to describe an object’s weight in air minus the buoyant force supporting it?

• apparent weight

• buoyant force

• density

• freeboard

What is the scientific term used to describe how much material is present per unit of volume?

• apparent weight

• density

• gravity

• waterline

When a ship is moving on the ocean, around which portion of the ship does it seem to move?

• ballast

• center of gravity

• center of weight

• waterline

What is the effect of adding excessive weight on the top of the mast of a ship?

• decreased ballasting

• decreased stability

• increased buoyancy

• increased stability

What component on a submarine is absolutely essential to allow it to submerge?

• ballast tanks

• bow planes

• propellers

• stern planes

Which factors MOST significantly affect ship stability?

• center of gravity and center of buoyancy

• ship height and ship width

• waterline and freeboard

• weight of the ship in air and weight of the ship in water

What law or principle is represented by the following statement: “An object immersed in a fluid feels an upward force equal to the weight of the fluid being displaced by the object”?

• Archimedes’ principle

• Bernoulli’s principle

• Einstein’s law of motion

• Einstein’s law of relativity