My opinion on your queries are as under:
how long can he evade summons like this , how to make sure he gets the summons?
Opinion: Its depend on your efforts, file an application under Order 5 rule 20 of CPC before Family court for publication of the summon in newspapers, after publications if he is not ready to appear before the court then the court will proceed him as ex-party and pass an order in your favour.
is it possible to prevent him from going abroad?
Opinion: Without any criminal case, nobody can restrain him to go abroad.
Is it not required for him to attend domestic violence case personally even once if he goes abroad.
Opinion: His advocate may handle the case, in case of his absence.
how to get justice in my case.
Opinion: Fight the case on merit, you will get justice with the help of the Lawyer.
if i file 498A then how many times will i have to go to police station?
Opinion: If there is any dowry demand then you may file the 498A case against him before police or court, it may be 10 times.
won't the police harass me too in the process?
Opinion: No police will not harass you but police need some evidence.
I have to care for my child & im finding it difficult to appear for so many cases.
my husband is a influential & rich person he earns 4 lacs/ month, he can easily bribe the police & turn them against me. Im scared of all this. What do you suggest in my scenario?
Opinion: fight the pending cases, it will be better for you at present situation.
Also how is 498A different from domestic violence as he can obtain a anticipatory bail for 498 A easily?
Opinion: In domestic violence, there is no police interference but in 498A case the FIR will be registered and he may get arrested if not get any anticipatory bail.
In matrimonial case the AB may be grant easily.