Strain is defined as change in dimension over original dimension. Now we know dimension has the units of L thus this means it has no dimensional formula and has no units.

Strain= Change in dimension/Original dimension
Thus
Dimensional Formula of Strain= (M⁰L¹T⁰)/(M⁰L¹T⁰)

Dimensional Formula of Strain= M⁰L⁰T⁰

Now we know dimension has the units of L thus same units cancel each other leaving numeric value only. So Strain has no SI unit.

Force Constant is defined as force per unit displacement. The formula is

Force Constant= Force/Displacement
Dimensional Formula of Force = M¹L¹T^-2
Dimensional Formula of Displacement = M⁰L¹T⁰

So Dimensional Formula of Force Constant = M¹L⁰T^-2
SI unit of Force Constant is Nm^-1

Surface Tension is defined as force per unit length. The formula is

Surface Tension= Force/Length
Dimensional Formula of Force = M¹L¹T^-2
Divide it by Length L¹

So Dimensional Formula of Surface Tension = M¹L⁰T^-2
SI unit of Surface Tension is Nm^-1

Power is defined as work done per unit time. Its formula is

Power= Work/Time
Dimensional Formula of Work= M¹L²T^-2 Divide it by Time T¹

So Dimensional Formula of Power= M¹L²T^-3
SI unit of Power is Watt represented by W

Work is defined as force multiplied by displacement .Mathematically its formula is

Work= Force x Displacement

Now, we have already derived the dimensional formula for force and displacement. So
Dimensional Formula of Force= M¹L¹T^-2
Dimensional Formula of Displacement = M⁰L¹T⁰

Thus
Dimensional Formula of Work= (M¹L¹T^-2) x M⁰L¹T⁰

Dimensional Formula of Work= M¹L²T^-2
SI units of Work is Joule represented by J

It should be noted that energy of all types ( Surface Tension, Kinetic, Potential etc) have the same dimensional formula as that of Work. Moreover the Moment of Force represented by N-m also have same Dimensional formula