Misconceptions about PE

Q. There is an object of mass 'm' at a height 'h' from the ground. When you say that the potential energy is 'mgh', which of the following is true

1. The potential energy at ground level is taken as zero
2. Potential energy at infinity is taken as zero
3. Potential energy is stored in the object
4. 'mgh' is the potential energy of earth-body system

Q.

_________ of a two particle system depends only on the seperation between the two particles.

1. Kinetic Energy

2. Total Mechanical Energy

3. Potential Energy

4. Total Energy

Q. If a body of mass m is raised to a height 2h above the earth’s surface, the gain in potential energy is

1. zero
2. mgh/2
3. mgh
4. 2mgh