Dom, thanks for the comment. Some of the questions in that quiz seemed to be a little open-ended with no real correct answer. Something like this:
——
Which of the following does not belong with the others:
A. Apple
B. Horse
C. Cow
D. Rattlesnake
——

Radoslav, nice attempt at the questions. I have not spent quite enough time yet looking at the questions to answer as completely as you did.

2. OEM console, is it that java application used on 9i? Because I can’t find “event manager” in current OEM, but I’m not a DBA, so maybe I’m blind

3. I don’t know, I don’t use it..

4.
A – ok, crontab can be used for job scheduling, but dbms_job is in the database for ages (I only worked with >=8i versions of Oracle).
I would choose probably this.. You can schedule jobs using OEM, but are still using dbms_job or newer dbms_scheduler, and this is also possible without OEM..
B – similar to A, you can send emails without OEM using utl_smtp or utl_mail.
C – I don’t know what schema manager is, I’ve never use it..
D – “Using SQL*Plus to start and stop the database. This is because SQL*Plus cannot issue “startup” or “shutdown” commands”
What? In which version was it not possible?

sqlplus sys/******@maja as sysdba

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  235999648 bytes
Fixed Size                   450976 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
Database mounted.
Database opened.

5.
A-maybe ok
B- yes, we can display indexes
C-same as B
D-depends on what maintenance task is.. we could have some task on OS level..
I would choose A, D

6. this is very inaccurate question.. what if os_authent_prefix is not ops$, ops$user could be a valid user with db password auth.
A – what if server = client? and you can also have remote authentication enabled (remote_os_authent), so this is not accurate..
B – i don’t know, i’m only 27…
C – maybe yes, if remote_os_authent is enabled and it’s correctly setup
D – not true, 1. it can by set in spfile.. 2. is parameter can be null (in oracle empty string is null)
http://download.oracle.com/docs/cd/E11882_01/server.112/e17110/initparams172.htm#sthref501
in fact oracle strongly recommends it to set to null
http://download.oracle.com/docs/cd/E11882_01/network.112/e10746/asoauth.htm#i1006270
I would choose D.
7.
I not sure but I think all could be correct some with remote auth enabled and some with os_auth_prefix set to “”…

8. with remote_os_authent=false you disable remote OS auth (which is disabled by default), not os authent.
No answer is correct, I think

maybe i’ll add some others

I know the quiz to a certain extent mirrors the trends of the OCP exams themselves – but it all implies that if you master OEM, you master the database.