Please give me any standard with regards to shower or floor drain slope test.

1/4 inch per foot is the standard.

In doing this several times, I realized there needs to be a tool to use in order to get your slope correct regardless of shape or size. I was unhappy with the current options, so I came up with a cheap and simple solution - EZ-Slope float strips. It is cheap, simple, reproducible and consistent.
Check it out - http://www.ezslope.net
Joe

Hi Joe and welcome to The Plumbing Page at AskMeHelpDesk.com
Great idea! I added it to my data base. Great help for Do It Yourselfers. Thanks, Tom