Pitot Static

Question 1

If just the pitot tube is open, the drain hole, and static port is blocked

Answer 1

Then the airspeed indicator drops to zero

Question 2

If pitot, drain hole, and static are blocked

Answer 2

Changes of airspeed will not be indicated (freezes)

Question 3

If the pitot and drain hole are blocked but static is open

Answer 3

Then airspeed will work as an altimeter

Question 4

If pitot is open, but the static is blocked

Answer 4

Then the airspeed will indicate slower if above and faster if below where the source became blocked