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Q.

Which of the following does not have a fundamental unit?


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a

Mass

b

Time 

c

Force

d

Electric current 

answer is C.

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Detailed Solution

Concept: Basic quantities are some basic quantities used to derive or explain other physical quantities. Basic size is measured in basic units.
Basic units are defined using easy-to-reproduce natural phenomena. Basic quantities cannot be defined as other physical quantities.  Force can be defined as the product of  mass and the rate of change of body displacement (length) per unit. Since force is not a basic quantity, there is no basic unit.
Hence, the correct option is 3) Force.
 
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