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  4. A particle having almost zero mass and exactly zero charge is

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Q. A particle having almost zero mass and exactly zero charge is

UPSEEUPSEE 2008Atoms

Solution:

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 $1837\, m_{e}$ mass
So, the required answer is neutrino