Hi Aspirant !

If address is too long then you can use address line 2 to fill it up. Generally, in address line 1 street address is filled. Address line 2 is for the apartment number (or any other designation not literally part of the physical address) If the apartment  number is short, and the address is short, it can be done in one line only.

For example: in line 1 you can fill your area such as Bidholi, Dehradun, 248xyz

In line 2 you can fill your house number : H.No. 23xyz , second floor , near xyz etc.

For more information, visit here:

How to fill KVPY 2021 Application Form - Dates, Documents, Fees, etc. (careers360.com)

Hope I answered your query, Thankyou!