Delete the CustomList in sharepoint 2010 using powerShell

 Just Follow the below steps

  open Sharepoint 2010 Management Shell

Syntax:-

   Get-SPWeb "YourSiteCollectionUrl" |  Where-Object { $_.Lists.Delete([System.Guid]$_.Lists["Listname"].ID) }


Example:-

  here  YourSiteCollectionUrl= http://sfs03-pc:2222/sites/Ajax/  ListName="Test"

 Get-SPWeb "http://sfs03-pc:2222/sites/Ajax/"