Question

We generally measure the depth of the sea in __________.
A)Feet
B)Fathoms
C)Metres
D)Nautical Miles

Answer 1

Hint :Depth is defined as the measurement of something from the surface or top to the bottom of something, i.e. how deep something goes down.

Complete answer :
Option B, ‘Fathoms’ is a unit of measurement used for measuring the depth of the water. One fathom is equal to six feet or 1.83 metres or 2 yards or 72 inches. The word has been derived from Old English 'farm’ or ‘faethm’ which means outstretched arms. So, it is the appropriate answer.

Additional information:-
Option A, ‘Feet’ is the plural of ‘foot’ which is a unit for measuring the length. In this, one foot is equal to 12 inches and one yard is equal to three feet. So, it is not used for measuring the depth and thus an incorrect answer.
Option C, ‘Metres’ is the defined as the base unit of length which can be converted to other units of the metric system. One meter is equal to 100 centimeters and 1000 meters is equal to one kilometer. Thus, it has no relevance to the question and an incorrect answer.
Option D, ‘Nautical Miles’ is defined as the unit of measurement which is used in air, marine and space navigation. One nautical mile is equal to 1.1508 statute miles. Thus, it is not the correct answer.

Thus, the correct answer is Option B, i.e. ‘Fathoms’.

Note :An instrument has also been designed to measure the depth of water and can make automatic permanent record of measurements which is known as Fathometer.