Hello Midasala subhash , No  if it increases then the reason is not lockdown. Now every year the cut off Trends changes - it increases or decreases. But the cut off of these nits or iiits doesn't depend on this lockdown or some curfews etc.

Cut off for these colleges mainly depend on the following factors :-

• The difficulty level of the examination.
• Total number of candidates that appeared in JEE Mains.
• The previous years cutoff Trends.
• Number of seats available in in NIT or IIIts.

Based on these factors the cutoff are increased or decreased, so this lock down doesn't affect the cutoff, but if the number of candidate decreases then there is chance that cutoff closing ranks will rise up a little.

Hope it will be helpful for you :)