What are the fundamental forces in nature ?

Define force . What are the basic forces in nature ?

Which of the following represents fundamental forces of nature ?

Match the following fundamental forces of nature with their relative strength. {:(,"List-I",,"List-II"),((A),"Strong nuclear force",(i),10^(-2)),((B),"Weak nuclear force",(ii),1),((C),"Elextromagnetic force",(iii),10^(-39)),((D),"Gravitational force",(iv),10^(-13)):} The correct match is

Match the two colums : Column - I indicates a situation & Column - II indicates the fundamental forces in physics {:("Column - I","Column -II"),("A) Force between two protons","P) Gravitational force"),("B) force between two neutrons","Q) electromagnetic force"),("C) force between pen and finger","R) Strong nuclear force"),("D) Tension force in string ","S) Weak nuclear force"):}

Fundamental unit of nature is

What are fundamental quantities ? State their units in SI.