Hi Sachin,
To answer your query on Payroll please note tha following points:
a. Payroll is nothing but the salaries / breakups of the same of the employees in the organisation
b. Payroll will consist of (normally) the Employee Code / no. Name / Date of joining / No. of days worked (30 or 31 depending on the month) + Basic Salary + allowances (depending on thhe no. of components ) =Gross Salary
c. From the Gross salary there will be deuctions ranging from the statutory deductions like PF / ESI where applicable/ Profession Tax / Income Tax where applicable / Loan taken by employee(this is internal)= NET SALARY
This is what payroll is all about in simple language. In fact a senior member in this site Mr.Rajat Joshi has answered this in a more elaborate way to another person who had the same query as you . just click on the forum Talk to Seniors & you will find the answer that you are looking for.Since I am not based in the country there might be certain deduction slabs which you might need to know also , but I hope this information helps you out on your Interview. All the very best to you & God Bless
Regards,
Sadashiv Rao