Multiple choice

Which of the following is the lightest of all the quarks?

  1. The up quark

  2. The down quark

  3. The bottom quark

  4. The top quark
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A Correct answer
Explanation

The up quark or u quark (from its symbol, u) is the lightest of all quarks, a type of elementary particle, and a major constituent of matter. It, along with the down quark, forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei.

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