For the EASA PPL(A)-exam I got the following question:
An increased density altitude has the following effect:
- Increased take-off speed and decreased acceleration
- Decreased take-off speed and decreased acceleration
- Increased take-off speed and increased acceleration
- None of the above
As this question is ambiguous, I asked the examiner which speed was meant: indicated airspeed IAS or true airspeed TAS. She confirmed that the question was about indicated airspeed IAS.
In that case I would say "4. None of the above". However, during debriefing a fiery discussion amongst the students arose and we didn't reach an agreement about the question. So I'm checking here... [EDIT: btw, I passed the exam :-) ] [EDIT: after the discussion the examiner counted both 1. and 4. as correct! If we're talking about IAS it should definitely be 4. in my opinion; if we're talking about TAS it should be 1. in my opinion. Just checking with you guys.]