Physics Question Elementary/Fundamental Particles!!?

The electromagentic force (EM) operates between charged particles whatever the distance apart (as EM has an infinite range).

The strong force (S) operates on particles containting quarks but only if the particles are close enough (as S has a finite range)

The weak force (W) acts between all fermions (fermions are spin half particles; if you have not met the term, then just treat it as meaning all hadrons and leptons). The particles have to be close (as W has a finite range).

The gravitational force (G) is very weak but acts between all particles with mass whatever the distance apart. G has an infinite range.

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The question is very poor. It does not say how far the particles are apart. So we must assume it means all possible forces.

So on this basis the answers are:

a) Mainly EM. But also W and G

b) G and W.

c) Mainly EM. If the protons are very close, then also S and W. Also G.

d) Mainly EM. If the particles are very close, then also W. Also G.

I think this is right:

a) Electromagnetic, gravity.

b) Weak, gravity.

c) Electromagnetic, gravity.

d) Electromagnetic, gravity

Anything with mass interacts via gravity.

Anything with an electric charge will interact through the electromagnetic force.

Anything with a color charge (i.e., quarks and gluons) interact through the strong interaction. While a proton (and a neutron) is colorless, it doesn't interact via the strong interaction. However, the constituent quarks inside a proton and the gluons that bind them together, have a residual reaction when protons and neutrons are within a nucleus - the strong nuclear force.

Neutrinos are involved only in weak interactions, which involve changing flavors of quarks.