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As we all know in case of multiple threads each thread maintains it’s separate stack and register state.
do they also maintain separate virtual memory state or it can be shared ?
I don’t think there should be any problem in sharing virtual memory state between processes.
EDIT :
If thread doesn’t maintain state then why not the third option of question 1 on the link ( http://www.geeksforgeeks.org/archives/19913 ) is not true ?
Each process has its own address space aka range of virtual addresses that the process can access. Each process can have multiple threads. So, yes all the threads in a process share the same address space. Note that this is the primary reason that variables can be shared across multiple threads of the same process without any special mechanism.
On the other hand one cannot share variables across two separate processes without using special mechanisms like Inter process communication because each process has its own address space.