Updated Feb 22, 2021 | 08:45 IST RRB Answer Key 2020 for Ministerial & Isolated Categories has been released. Candidates can check the question paper, responses, and keys through the official link available at regional RRBs. RRB Answer Key 2020 for Ministerial & Isolated Category out | Photo Credit: Representative Image Railway Recruitment Board has released RRB Answer Key 2020 for Ministerial & Isolated Categories. The Board has activated the link for question paper, responses, and keys & raising objections on the regional websites of RRBs. The link will be activated for appeared candidates from February 22 to February 28, 2021. Candidates who want to raise objections can do it by February 28, 2021, till 6 pm. The prescribed fee for raising objections is Rs.50/- plus applicable Bank Service Charges per question. In case the objection raised is found to be correct, the Fee Paid against such valid objections shall be refunded to the candidate. The refund will be made to the account from where the candidate has made the online payment,