Hi @Nihal_TN
Any shortfall due to physical delivery margin requirements will amount to a non-upfront margin shortfall and margin penalty will be charged accordingly.
You can check this thread where Nithin has explained the bifurcation between upfront and non-upfront margin shortfalls in detail.
T+1 day (It will be Monday in this case )
T+1 days here means the next working day, holidays and weekends will not count as cut off days.
In this case, you can bring the shortfall by Monday morning to avoid having the position squared off and a penalty levied.
Both scenarios are possible depending on the extent of the shortfall and days left for the contract expiry.
Yes. You can check more on calculation of margin penalty here