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Give an example of (a) a physical quanti...

Give an example of (a) a physical quantiy which has a unit but no dimensions. (b) a physical quantity which has neither unit no dimensions. (c ) a constant which has a unit. (d) a constant which has no unit.

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(a) Solid angle/Planer angle
(b) Relative density/Efficiency
(c ) Universal gravitational constant/Planck.s costant
(d) Reynold.s number
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