An example of a grad-school level question?
The surface gravity of Pluto is the weakest of the nine planets because Pluto

An example of a grad-school level question?
What is the complementary base of adenine in DNA?

An example of a grad-school level question?
A simple machine that helps move a flag up a flagpole is

An example of a grad-school level question?
In which example could a thermometer be used to show that heat energy is being transferred?