Make a Web Application using Power Cell command(I have taken application backup using "Save site as template" )

1) Create Web Application

New-SPWebApplication -name "ApplicationName" -HostHeader "spserver" -URL "http://spserver:9009" -ApplicationPool "Test" -ApplicationPoolAccount "spserver\Administrator" -DatabaseName "ApplicationName " -DatabaseServer "spserver\sharepoint"

2) Create Site Collection

new-SPSite -url "http://spserver:9009" -OwnerAlias Administrator -Name "ApplicationName" -ErrorVariable err  -ErrorAction SilentlyContinue

3) Add Solution

Add-SPUserSolution -LiteralPath "C:\Application.wsp" -Site "http://spserver:9009"

4) Activate Solution

Install-SPUserSolution –Identity  Application .wsp -Site "http://spserver:9009"