Discovery of Electron, Proton and Neutron — Prelims Questions

Which of the following statements about cathode rays is INCORRECT?

The charge-to-mass ratio ($e/m$) of canal rays is maximum for which of the following gases?

Which experiment led to the discovery of the neutron?

An electron has a charge of $1.602 \times 10^{-19},\text{C}$ and a mass of $9.109 \times 10^{-31},\text{kg}$. What is its charge-to-mass ratio ($e/m$)?

Which of the following subatomic particles has a mass approximately equal to that of a proton but carries no charge?

Which of the following observations from J.J. Thomson's cathode ray experiment was crucial in concluding that electrons are fundamental constituents of all atoms?