Question

The quarks have fractional electronic charge e/3 and 2e/3. Then why is such a fractional electronic charge not reflected on the oil drops?

• A. Quarks cannot be gained or lost
• B. Only electrons can be gained or lost
• C. To lose quark, energy in MeV is required
• D. Single quark is unstable

Answer 1

Answer: (C), (D)

The correct options are
C To lose quark, energy in MeV is required
D Single quark is unstable

Electrons, neutrons and protons are found to be made up of quarks but, we have, not yet got any evidence of existence of single quarks.Quarks are always found in group such that there charge becomes integral multiple of $e$
and therefore, and to break electron into quark a very high energy is required which is in terms of $MeV$. therefore, option(C),(D)