Quantization of Charge — Prelims Questions

An object has a net charge of $-3.2 \times 10^{-18},\text{C}$. How many excess electrons does it possess? (Given: elementary charge $e = 1.6 \times 10^{-19},\text{C}$)

Which of the following charges is NOT possible for a free particle?

Which of the following statements is TRUE regarding the quantization of charge?

If a body has a charge of $+1,\text{C}$, approximately how many electrons has it lost?

A conductor has a charge of $-8.0 \times 10^{-10},\text{C}$. If it gains $2.0 \times 10^9$ electrons, what will be its new charge?

Which experiment provided the most direct evidence for the quantization of charge?