Interest under 234b&c

Hi,

Tax payable for individual for Ay 2011-12 is 10854.  TDS deducted by employer is 10854 which as follows.

On 30th Sept 2010       -  1000

On 30th Nov 2010 --        1500

On 31st Dec 2010 --        1500

On 31st jan 2011-             2000

On 28th Feb 2011 -           2000

On 31st March 2011 ----Rs.2854.

Department has issued intimation under section 143(1) demanding interest under section 234B & C of 1250.  Whether interest is applicable for this.