A unitless quantity
(a) never has a non-zero dimension,
(b) always has a non-zero dimension,
(c) may have a non-zero dimension,
(d) does not exist.
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Q2
A dimensionless quantity
(a) never has a unit,
(b) always has a unit,
(c) may have a unit,
(d) does not exist.
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Q3
Can a quantity have dimensions but still has no units?
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Q4
Q. Give An Example Of: A. a physical quantity which has a unit but no dimensions. B. a physical quantity which has neither unit nor dimensions. C. a constant which has a unit.