An example of a grad-school level question?
A science class is taking a field trip to a forest to observe and study birds. Which tool would be most helpful for observing birds?

An example of a grad-school level question?
The axis of Earth is tilted at an angle of 23.5 from the vertical position. Which of the following is the main result of this tilt?

An example of a grad-school level question?
Which of the following statements best explains why stars appear to move across Earth's sky each night?

An example of a grad-school level question?
During science class, students combined 1 kg of iron filings with 1 kg of sand to create a mixture. Which of the following methods would be best for separating the iron filings from the sand?