Yes....S4 Q115. Final key answer is wrong. Correct answer is -30J (option 3) Formula for work done in isothermal expansion is -P.dv. As per key answer it is given wrongly as +30J.(option 2).

Yes... S4 Q169, both Answers 1 and 4 are correct. Question does not specify whether it is a solid or hollow cylindrical conductor.

According to the experts, questions number 8 and 13 from Chemistry and 81 from Physics section are doubtful. But it will only be clear once the official answer key is out. And as far as biology is concerned, there were no wrong questions, there might be a discrepancy in answers though.