Agamma ray primarily consists of pure energy and no mass.
a. true
b. false

A gamma ray primarily consists of pure energy and no mass is true. In fact it consists of high energy photons and massless. They have no charge and when exposed to any kind of material, it just passes through as if nothing is blocking it.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete