$(a)$ Why are anode rays called canal rays?
$(b)$ Mention two postulates of $J. J.$ Thomson's model.
$(c)$ Compare the properties of protons and electrons.

(N/A) The anode rays produced at the anode of the discharge tube are called canal rays because they pass through the holes (canals) of the cathode.
$(b)$ $(i)$ An atom consists of a positively charged sphere, and electrons are embedded in it.
$(ii)$ The negative and positive charges are equal in magnitude, making the atom electrically neutral.
$(c)$ Comparison of protons and electrons:

$S.No.$	Protons	Electrons
$(i)$	Positively charged.	Negatively charged.
$(ii)$	Mass is approximately $1 \, u$ (equal to $H$ atom).	Mass is negligible ($1/1840$ times that of a proton).