SSC Delhi Forest Guard 2020 Mock Test General Knowledge Science Technology and Inventions

ઈલેક્ટ્રોનની શોધ કોણે કરી?

1
જે જે થોમસન
2
જેમ્સ ચેડવિક
3
ઇ. રધરફોર્ડ
4
ગોલ્ડસ્ટેઇન
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