1) a physical quantity which has unit but no dimension
2) a physical quantity which has neither unit nor dimension
3) a constant which has a unit
4) a constant which has no unit
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Solution
(1) Angle in a plane is measured in radian ,though it has no dimensions
(2)Strain has neither units nor dimensions.
(3) Universal Gravitational constant (G) has a constant value : 6.67×10-11 Nm2kg-2
(4) Reynolds number is a constant which has no unit.