Those are very useless questions, I wonder what kind of people this company is looking for !
1/ the list of neighbours (BA list) is transmitted on SACCH in dedicated mode, in the SI2 message.
2/ Each neighbour shall be measured at least every 5 seconds
3/ with DTX enabled, the rxqual is **measured** based on (mostly) the SACCH bursts which are transmitted every 120ms. But the RXQUAL is **computed** every 480ms, whatever the state of DTX.
Good luck for your job search 🙂