BMAT QUESTION from 2013 physics

Could you explain this question and answer?

This realm is including in IMAT?

When we close the switch the resistance located in the R area will be deleted so R will be decreased.
As one of the resistances is deleted , the total I will be increased. So Q and P are increased.



Are P,Q,R the meter of checking voltage?

Why does R voltage become decreased after closing switch?