Which source below would be considered most reputable in an academic essay?

The law of Conservation of energy states that energy can never be:

Which of the following is not a naturally occurring magnet?

The study of stationary electric charges is known as:

What is the maximum number of electron shells possible in an atom?

The necleons are considered which of the following subatomic particles?

Which device converts mechanical energy into electrical energy?

All elements and compounds can be considered as:

Which in-text citation below is correct when citing the following internet source in your essay?  “Growth Mindset.” Mindset Scholars Network, 2015, http://mindsetscholarsnetwork.org/learning-mindsets/growth-mindset/.

The SI unit used to measure on radioactive decay event per second is called: