Answer for question 1: If we do coding in Descriptive,then the same can be reused in some other PC's.But if we do coding using Object respository,it runs in your respective PC but not in some other PC's.Because it expects object respository values in those PC's.So it is better to use Descriptive programming because of reusability.
Answer for question 3:I hope some useful benefits are there in using QTP10. They are
#Can save the test result in MS word and PDF format
#Can get the practical run time of the application
#Can reuse the existing codes
#Can handle multiple IE browser windows
#Better error handling mechanism
#Suitable to web applications
Answer for question 3:I hope some useful benefits are there in using QTP10. They are
#Can save the test result in MS word and PDF format
#Can get the practical run time of the application
#Can reuse the existing codes
#Can handle multiple IE browser windows
#Better error handling mechanism
#Suitable to web applications