Question

Which of these is not a type of quark pair?

Up-Down
Strange-Charm
Left-Right
Top-Bottom

Answer 1

One type of Matter Particle is called Quarks.

These are particles which have an unusual property of having a fractional charge.

There are six quarks or 3 pairs of quarks, as most physicist like to say, namely top-bottom, strange-charm, up-down, so the left-right option in the question is not a quark pair.