behaviour

Question
my 4 moth old lab dog is inactive during days in summer and very active during evening and night.

he go for a walk of 20-30 min in the eve and then play with us but after so much activity he started barking a lot and after dinner he become so active that he bark so high .

We are not able to find any answer to why he do that, he after night walk does not sleep soon and bark too much

When we leave him alone ,it become intolerable to us .

and when we try to calm down him he  bites us

Answer
You can download the book "After You Get Your Puppy" here and it's free.  There will be lots of good advice on how to deal with puppies his age: http://www.dogstardaily.com/storefront/after-you-get-your-puppy
As to the barking when he is left alone, the book you need is "I'll be Home Soon" by Patricia McConnell.  It will help you train him to be alone without fretting.  Unfortunately, the training for this is longer than what I can describe in a few short paragraphs.  Amazon should have the book and it's very inexpensive.  If you have any clicker trainers in your region of India, perhaps you could attend a puppy class.  
Most puppies do have a very active period around sunset, and that is normal behavior which will lessen as the pup gets older.  Here's an article about what to do when he is nipping you: http://petprofessionalguild.com/Resources/Documents/PPG-Puppy-Nipping-GuideUSA.p