An example of a grad-school level question?
Most electrical wires are covered with plastic or rubber. The wires are covered with plastic or rubber because those materials

An example of a grad-school level question?
Which of the following best describes a mineral?

An example of a grad-school level question?
A student is given three identically sized blocks. Each block is made of a different material. What characteristic of the blocks should be examined to find out which block is made of metal?

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?