Explanation: Weight is the downward force acting on an object due to gravity.
w= weight of an object
m= mass of object
g= gravity
As the person has a constant mass, the weight differs due to the value of gravity (g). The planet having highest gravity would make a person weigh the most.
As the value of gravity varies: Mercury (3.7)<Uranus(8.9)<Earth(9.8)<neptune(11.2), the weight of the person varies in the same order: Mercury<Uranus<Earth<neptune.
Control rods is unique to nuclear power plants as they are mainly used in nuclear reactors to stabilize the rate of fission of plutonium or uranium. They are usually composed of chemical elements such as cadmium, silver, boron, and indium.