Hey sulakshna,

No, you will not be interrogated like viva in practical exam types. They will ask you to present the necessary documents for the admission and selection of colleges. JoSAA counselling is organized after the announcement of the result of JEE Advanced and JEE Main (AIR). JoSAA stands for Joint Seat Allocation Authority which is a counselling authority and it is set up by the MHRD (Ministry of Human Resources Development). JoSAA conducts and manages all the counselling related activities for admissions in IITs, ISM, NITs, IIITs.

• Start of Registration and Choice Filling June 16, 2019 (10 AM)
• Commencement of Choice Filling for AAT 2019 June 21, 2019
• Display of Mock Seat Allocation-1 based on the choices filled-in by candidates as on June 21, 2019 (5 PM)- June 22, 2019 (10 AM)
• Display of Mock Seat Allocation-2 based on the choices filled-in by candidates as on June 23, 2019 (5 PM) June 24, 2019 (10 AM)
• End of JoSAA 2019 Registration and Choice Filling June 25, 2019 (5 PM)
• Reconciliation of data, seat allocation, verification and validation June 26, 2019
• Seat allocation - Round 1 June 27, 2019 (10 AM)
• Round 1 - Document verification and acceptance of seat by reporting at Reporting Centres June 28 to July 2, 2019 (10 AM to 5 PM)
• Display of seats filled/availability status July 3, 2019 (10 AM)
• Seat allocation - Round 2 July 3, 2019 (5 PM)
• Round 2 - Document verification and acceptance/withdrawal of seat by reporting at Reporting Centres July 4 to 5, 2019 (10 AM to 5 PM)
• Display of seats filled/availability status July 6, 2019 (10 AM)
• Seat allocation - Round 3 July 6, 2019 (5 PM)
• Round 3 - Document verification and acceptance/withdrawal of seat by reporting at Reporting Centres July 7 to 8, 2019 (10 AM to 5 PM)
• Display of seats filled/availability status July 9, 2019 (10 AM)
• Seat allocation - Round 4 July 9, 2019 (5 PM)
• Round 4 - Document verification and acceptance/withdrawal of seat by reporting at Reporting Centres July 10 to 11, 2019 (10 AM to 5 PM)
• Display of seats filled/availability status July 12, 2019 (10 AM)
• Seat allocation - Round 5 July 12, 2019 (5 PM)
• Round 5 - Document verification and acceptance/withdrawal of seat by reporting at Reporting Centres July 13 to 14, 2019 (10 AM to 5 PM)
• Display of seats filled/availability status July 15, 2019 (10 AM)
• Seat allocation - Round 6 July 15, 2019 (5 PM)
• Round 6 - Document verification and acceptance/withdrawal of seat by reporting at Reporting Centres July 16 to 17, 2019 (10 AM to 5 PM)
• Display of seats filled/availability status July 19, 2019 (10 AM)
• Seat allocation - Round 7 July 19, 2019 (5 PM)
• Round 7 - Document verification and acceptance/withdrawal of seat by reporting at Reporting Centres. Last round for seat withdrawal at participating institutes July 19 to 23, 2019

for more info go to https://engineering.careers360.com/articles/josaa-counselling 

hope that helps

Hi Sulakshna

No dear, there would not be any 'interrogation' kind of thing. All the heads appointed will ask for the required documents, and verify whether the details provided by you are correct or not. There will be different people for each document verification. The people there are humble, you can consult them if you have any problem. The process will be of 10 minutes or so and will go out smoothly.

I hope this helps. Feel free to ask any other queries if you have.