what is the pre flight check for oxygen bottles, first aid kit and physicians kit in an aircrat

I am going to answer this based on what *we* were supposed to do. The actual contents of the kit were controlled by those working on the ground (employees or outside contractors).

We only had to check both the First Aid & Medical Kit
1. that it was there &
2. that the seal was unbroken.

For passengers, we could open the First Aid kit at will but there was a procedure for the medical kit, which required a medical professional & the authority of the pilot.

The oxygen bottles too, we only had to check
1. That they were there & stowed correctly
2. that on the indicator, that the needle was in the green. This meant that the bottle was full & had the correct pressure.
3. We just needed to see that there was a mask (plus hose) for each bottle, & that was still in an untampered, sealed bag.

There is also a whole bunch of other stuff we had to check, including the heart defibulator, flashlights, etc. depending on the aircraft & the position where the F/A was seated.

hth!

It would depend on the country where the carrier is flagged/based out of.

Doing a search I found in India:

7. PERIODIC EXAMINATION OF THE KIT:

7.1 The stowage & the intact condition of the seal of the First Aid Kit(s) & Physician is Kit, as applicable, shall be ensured prior to every flight by a person designated by the organisation. The responsibility of the designated person with
regard to this check shall be included in the Operations Manual.

7.2 The contents of such Kits shall be examined & certified by Registered Medical Practitioners/ Medical Officers holding atleast MBBS degree once in six months in the case of transport type of aircraft engaged in cheduled/non-scheduled
operations as well as aerial work, & once a year in the case of other aircraft like training aircraft, private aircraft etc.

I hope this helps.