I have passed SQL fundamental-I (1Z0-051) exam and now I am preparing for oracle database Administration exam-I(1Z0-052), but I have few questions :
(1) Is knowledge of linux/solaris is must to pass this exam.
(2) Is their is any requirement of PL/SQL before starting for this exam study.
The best place to find the answers to your questions is in the exam topics. Review the exam topics for this exam Oracle Certification Program: Oracle Technology and Applications Certification to find out what is covered.
As Brandye says, you should use the exam topics to plan your study. The answer to your questions, however, is no to both. You can find links to Oracle documentation, articles, books and videos relevant to this exam here: