Discovery of Sub-Atomic Particles

Which of the following is never true for cathode rays?

What are the observations and conclusions drawn by J. J. Thomson while conducting experiments with a discharge tube for studying the properties of cathode rays? 

Describe Millikan's oil drop experiment in brief. 

Energy of an electron increases with increase in distance from the nucleus. Comment on the change in kinetic energy and potential energy.

Why is high voltage and low pressure maintained in the discharge tube?

Why was a gas at low pressure taken by Thomson while conducting the experiment? 

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Loss of electron from hydrogen atom results in nucleus of $~1.5\times {10}^{–3} \mathrm{pm}$ size.

Reason R: Proton $\left({\mathrm{H}}^{+}\right)$ always exists in combined form.

In the light of the above statements, choose the most appropriate answer from the options given below:

Name the fundamental particle of an atom that has highest value for its $\mathrm{e}/\mathrm{m}$.

What is charge on $16$ amu of ${\mathrm{O}}^{2-}\left({}_8{}^{16}\mathrm{O}\right)$(charge on one electron $=-1.6\times {10}^{-19}\mathrm{C}$)

The study of cathode rays (i.e. electronic discharge through gasses) shows that

Find the e/m value of $\mathrm{\alpha }$−particle with respect to hydrogen atom.

The mass charge ratio for ${\mathrm{A}}^{+}$ ion is $1.97\times {10}^{-7} \mathrm{kg} {\mathrm{C}}^{-1}$. Calculate the mass of $\mathrm{A}$ atom?

Calculate the number of electrons constituting $1 \mathrm{C}$ of charge. Given that the charge on electron is $1.6\times {10}^{-19} \mathrm{C}$. 

Find the total negative or positive charge on a $2 \mathrm{g}$ silver coin. The atomic number and atomic mass of silver is $47$ and $107.9$ u respectively. Given Avogadro's number is $6.023\times {10}^{23}{ \mathrm{g}}^{-1}{ \mathrm{mol}}^{-1}$.

Two spheres A and B of gold (each of mass 1 kg.) are hung from two pans of a sensitive physical balance. If A is given 1 Faraday of positive charge and B is given 1 F of negative charge, then to balance the balance we have to put a weight of (1F = 96500 C)

A glass tumbler contains 1 billion amoeba and two sodium ions are there on the body of each amoeba. Find out the charge contained in the glass.

What is the charge on the sub-atomic particle 'proton'?

The name of the scientist who discovered neutron is - 

Mention any two properties of cathode rays.

What were the pressure and voltage conditions applied in the cathode ray tube experiment?