Dear All,
 
Can anyone please help me to resolve following issue?
 
On imperial drawing if I select any dimension and right click on it to change its precision value, I see precision values in decimal instead imperial value. I am using AutoCAD 2010.

It sounds as though UNITS is set to decimal if your precision values are showing up as decimal.

No my dear friend even if UNITS are set to imperial

Maybe you are using a different version of AutoCAD than I am.You have two choices when it comes to Templates.  They are Metric or Imperial.  If you choose to use an Imperial template then you have five length types when you invoke the UNITS command.  They are...-Architectural-Decimal-Engineering-Fractional-ScientificIt sounds like you are using a Metric template.

Check the primary units that are set in your dimension style. It is possible to have drawing units set to imperial and the dimension style untis set to decimal.