For GETing an incremental feed, Kumar would need to put the Etag value in the "If-None-Match" header.
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I believe the intent is that you treat the ETag as an entity tag the internal representation of which is opaque. In other words, you should not rely on the numerical ordering of the integer representation of the ETag. Consequently, there is no reason to and you should not perform the query you seek to perform.
For GETing an incremental feed, Kumar would need to put the Etag value in the "If-None-Match" header.
This posting is provided "AS IS" with no warranties, and confers no rights.