Cathode Rays and Positive Rays

Which of the following is never true for cathode rays?

Protons are discovered by 

Among the following, the correct statement about cathode ray discharge tube is

 

Cathode rays are:

In Millikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is $-1.282\times {10}^{-18} \mathrm{C}$, calculate the number of electrons present on it.

Which of the following substances, shows the properties of phosphorescent?

The electrical discharge through the gases could be observed only at

The $\mathrm{e}/\mathrm{m}$ ratio is maximum for :-

The mass of cathode ray particle is:

The increasing order for the values of ${\mathrm{em}}^{-1}$ (charge/mass) is:

Cathode rays

The ratio of specific charge of an electron to that of a proton is

What are cathode rays?

Which of the following is an arrangement of increasing value of $\mathrm{e}/\mathrm{m}$ (with respect to magnitude only): 
 

The ratio of specific charge of an electron to that of a hydrogen ion is

What is the minimum real charge on any particle which can exist?

What is the increasing order for the values of $\frac{\mathrm{e}}{\mathrm{m}}$ (charge/mass)?

An oil drop has $6.4\times {10}^{-19}\mathrm{C}$ charge. The number of electrons in this oil drop are

The ratio of the $\left(\frac{\mathrm{e}}{\mathrm{m}}\right)$ (specific charge) values of a electron and an $\mathrm{\alpha }-$particle is

Which is not true with respect to cathode rays?