Of course if you don’t have a car, there’s nothing technically stopping you from lying, but I’m not going to advocate that.
Anyway:
Open the Qantas Wellbeing app (you need a QFF account) and log in. You don’t need to be an insurance member.
Go to Insurance (app design has just changed so it may be under a different menu for you).
Choose Tyre pressure check.
Answer 4 questions on your tyre pressure.
50 points are yours!
edit: may be fewer points if you’re not a member.
For yet more ways to earn Qantas Points without flying, see our monthly update.