Determine the output voltage with no load across the output

Question

Question 1:-

In each circuit of Figure 1, identify the series and parallel relationships of the resistors viewed from the source.

Question 2:
For each circuit in Figure 1, determine the total resistance presented to the source.

Question 3:
In Figure 2, determine the output voltage with no load across the output terminals. With a 100 k Ohm load connected from A to B, what is the output voltage?

Question 4:

The voltage divider in Figure 3 has a switched load. Determine the voltage at each tap (V1, V2 and V3) for each position of the switch.