Yeah, I've been flying 172's a lot lately too, ofcourse with experience nowhere near what many others on this forum have, but I would agree, a 30 degree bank is fine. Even if you were on crosswind by then and you had to do a 270 degree turn instead of a 180 so you didn't cut in too close, it's quite doable.
Honestly, I think your answer for their question seriously depends on the situation, on the land infront of you, on your skill level, busy or quiet airport, controlled or uncontrolled. Because if it's a busy airport yet uncontrolled
some people might still come in without a radio, and at 700 feet, you don't have time to switch to 121.5 (assuming everyone monitors that), unless you have it on standby, then its just a flick of a switch.
Good luck on getting through to the next round, if there is one.