So, for an IR test, the examiner may look at your flight plan, and ask you why the Alternate block is blank -- and have you justify that answer based on the regs and the weather. Or, if there is an airport there, ask you why you needed to put it there, and how you know it qualifies as a legal alternate today, which requires reference to weather, regs, NOTAMs, and the Terminal Procedures book. This is very different from the old days where an examiner would simply ask you "What's the required weather at your destination to not file an alternate? Can you use this approach as an alternate? What are the standard alternate minimums? Are the alternate minimums at this airport nonstandard?" and makes you think and analyze, not just parrot.