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Choose correct answer:

(I) a dimensionless quantity
(a) never has a nonzero dimension
(b) always has a nonzero dimension
(c) may have a nonzero dimension.


(a) never have a nonzero dimension

The quantities which don't have dimensions are called dimensional quantities
Eg : Relative density
0 0 0
Never has a non-zero dimension means there are no dimensions for it.
0 0 0
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