Question

Which among the following particles has almost zero mass and exactly zero charge?

• A. Positron
• B. Electron
• C. Neutron
• D. Neutrino

Answer 1

The correct option is D Neutrino

We know that the neutrino is the particle which has almost zero mass and exactly zero charge. Positron has the charge $+e$ and mass $m_e$ [equal to electron mass].
Electron is a particle which has $-e$ charge and $9.1\times {10}^{-31}kg$ mass.
Neutron is a particle which has zero charge and $1838m_e$ mass.
So, the required answer is neutrino.