Which of the following is a fundamental unit?
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A.
Kilogram (kg)
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B.
Pascal (Pa)
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C.
Joule (J)
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D.
Newton (N)
Correct Answer:
A. Kilogram (kg)
Explanation:
A fundamental unit is a basic physical unit that is not defined in terms of other units and forms the foundation of a measurement system. In the International System of Units (SI), there are seven such base units, including the kilogram (kg) for mass. Other options like the Pascal (Pa) for pressure, the Joule (J) for energy, and the Newton (N) for force are classified as derived units because they are established through mathematical combinations of the base units. For example, a Newton is defined using kilograms, meters, and seconds. Therefore, the kilogram is the only fundamental unit among the provided choices.
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