You are coming along with your answers, but the source you used has a number of incorrect answers. So I'll go through each one and let you know if you got it right or not and give you hints on what to look for.
1. Because GPS can cover the entire Globe, outside of Radar range; nor does the shape of the earth interfere with the signal. (versus old systems like Oboe, which had a certain range due to earth's curve.
Your answer is right, but missing the key ingredient that makes GPS work. Hint: It is a very specific kind of effect in the radio signal that allows the GPS satellite to calculate the correct signal to be sent back to earth.
2. Four are required unless you are in a boat or land vehicle, boats and cars generally not going above ground level very often.
Yes and no. It doesn't make any difference if you are standing still or are moving or are in a vehicle or on the water or in the air. Hint: The reason the four must be visible is called what?
3. 11,000 nm.
This answer is incorrect. You need to check another source like Wikipedia or GPS.gov. You also forgot to answer the second part of the question. Hint: On earth the speed of a given satellite appears to what? What is that kind of orbit called? What is the difference between a person looking at the satellite from earth and the satellite looking at the Sun?
4. 31. Also, If they aren't owned by the United States it wouldn't be GPS--It would be Galileo (Europe) or Compass (China or Russia)
Excellent. You nailed this one, and correctly noted that there are other global positioning satellites operated by other international space agencies.
5. About 500 watts.
Unfortunately, this one is also wrong. Hint: the actual wattage is much smaller. Why can such a small amount of power work over so great a distance?
6. What is the power in Watts for a ground-based device such as a GPS watch, a tracker, etc., needed to broadcast a signal to a GPS satellite?
Very good! You got this one right. All of our GPS devices are no more than a computerized radio tuned to receive the GPS radio signal and make the calculations the device is designed to provide.
Bonus Question: The Orion Arm of the Milky Way
Nailed it and for a visual, here's a conceptual drawing of the Milky Way with the Orion Arm and our Sun identified:
