As the ICAR AIEEA 2020 Exam(PG) has been conducted on 23rd September 2020 only, the answer key has not yet released. The NTA will release the answer key of ICAR AIEEA 2020 anytime soon for UG and PG programmes on the official website of NTA ICAR.
Official website - https://icar.nta.nic.in/WebInfo/Public/Home.aspx
Refer here for more info - https://university.careers360.com/articles/icar-aieea
Feel free to ask doubts in the Comment Section.
I hope this information helps you.