Physical DB Design and Adequate System?

What is meant by "physical database design fields are grouped, as they are stored physically and accessed by DBMS "

What is meant by "adequate system response time " ?
what is meant by "physical database design fields are grouped, as they are stored physically and accessed by DBMS "

This sentence means "in physical database design records are stored in groups, and we can access these records with the help of any Database Management System using Structured Query Language (SQL).

what is meant by "adequate system response time " ?
System Response time means, in how much time the result of the query is displayed on the screen.