Question

what were the five causes of russian revolution in 1917

Answer 1

There were a number of reasons, none of these decisive without the others:

Poorest and numerous peasantry class
Several wars lost by the Russian army and Navy
German intelligence funding Russian rebels
Extremely motley composition of the Empire ranging from the Bukhara Khandom to Polish Republic or Finland hardly attached to each other by anything more than the official languegelanguage
Fierce anti-Semitism as official policy. Remember, the Rotschilds or other bankers of Jewish decent never lended a single penny to the Tsars.
Political reforms that were at least 40 years late to be successful.
All of these factors played a role.