Will I get a notification when BITS PILANI recieve my application form, which I send through post? ?

As far as I can recall they shoe it on the website what the present status of your application is, do check.(Received/Processed..etc) Besides if you have sent it via Speed Post you can find out what your mail’s present location is and when it was received. It takes one day for your mail to reach Pilani from Jaipur. I sent it from Kolkata it took one and a half day to Jaipur and then it one more day to Pilani. Follow the link : BITS pilani application form