I actually just finished my orientation this week for my new job on a general medical floor, so I can tell you what you can most likely expect!
The specifics vary by state and by institution, but you will probably be given some form of nursing/patient scenarios to respond to. I had some in a packet to complete, and some where I had to watch a video of brief vignettes of patients, then stop the tape and write down what I thought the diagnosis would be, significant signs/symptoms, and nursing interventions along with rationales. For example, one patient is presented as a post-op woman who will go home tomorrow but she is very reluctant to get out of bed and do her ADLs. As she goes to get back into bed, she looks down at her calf and sees that it is very red, swollen, and tender. Obviously she has a DVT, so you write that down and then write what you would do (call the doc, put her on bedrest, anticipate orders for a heparin drip, etc.).
Once you've finished this packet, it will be graded by one of the nurses and this will be used to tailor your training to your needs. (For example, I missed one on pulmonary embolism, so I had a remedial video/quiz on the computer to do). My orientation also consisted of a rather lengthy skills assessment in which I had to do a catheterization, IV starts/piggybacks, NG tubes, etc. (all on dummies, of course). From there and based on what skills you feel comfortable with and what you think you need help on, the nurse will record what skills your preceptor should go over with you. At the end of orientation, all of this information will be sent to your boss and your preceptor to help personalize your training.
I hope this answers your question. Don't worry about any of it -- it's ALL designed simply to help you get the kind of training you need!