All si base quantities can be physical quantities but not all physical quantities can be si base quantities right..? Ykwim

Yes, you're right. SI base quantities are a specific set of physical quantities that are defined by the International System of Units (SI) as the foundation for all other measurements. These include length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity.

However, there are many other physical quantities that are not SI base quantities but are derived from them. For example, velocity is a physical quantity but it is derived from the SI base quantities of length and time. Similarly, force is derived from mass, length, and time. So, while all SI base quantities are indeed physical quantities, not all physical quantities are SI base quantities.