Ans: Bank account details are required as per Table 17 of FORM GST REG-01, account may be saving account too.
Ans: yes it is required. For detail please refer to section 22-24 of CGST Act, 2017.
Ans: Yes, As per definition of Supply under section 7 of CGST Act, 2017, Supply include disposal.Also look at the definition of “agent” which includes an auctioneer.
Ans: ITC for tax paid under GTA service can be availed. No, registration for GTA is not required if it is only supplying reverse charges supplies.
Ans: No. registration is not required. Pls refer section 23 (a) of CGST Act , 2017
Based on Tweets replied by Official Handle of CBEC