An example of a grad-school level question?
An engineer measured the time it takes sound to travel through samples of different materials. All of the samples were identical in shape and size. The measurements were made using ultrasonic waves with a frequency of 5 megahertz. Which question was the engineer most likely trying to answer?

An example of a grad-school level question?
The structures found in a living cell can be compared to the parts of a factory that produces cars. Which part of the factory is most similar to the nucleus of a living cell?

An example of a grad-school level question?
Which of these is an important safety rule to follow when using an electrical device?

An example of a grad-school level question?
Which food is a fruit?