These are questions of the either-you-know-it-or-you-don’t variety.
They test your understanding of the basic concepts of physics.
No equations or calculations are necessary for these questions.
They’re simply a matter of knowing your stuff.
These questions expect you to recall, and make use of,
one physical relationship, formula, or equation.
This might involve plugging numbers into a kinematic
equation of motion, or it might involve recalling the equation
E = hf and solving for E or f. These questions test to see if you
know important formulas and how to apply them.
These questions expect you to bring together two or
more different relationships, formulas, or equations.
This could involve bringing together two formulas from
the same subject—for instance, a problem in linear momentum
that requires you to calculate the momentum of an object before
a collision so that you can calculate its velocity after
the collision—or it may bring together formulas from two
different subjects—for instance, a problem that involves
an electric point charge moving in circular motion in a magnetic
field. These questions test not only your knowledge of physical
relationships, but also your ability to integrate more than one in
a complex problem.
You’re probably thinking that the recall questions are the easiest,
and the multiple-concept problems are the hardest. This isn’t necessarily true.
Most people have an easier time bringing together two simple principles of
mechanics than recalling the significance of the Rutherford experiment.
You’ll find all three types of questions throughout the test, and at
different levels of difficulty. Ultimately, every question tests the
very same thing: whether you’ve grasped the basic principles of physics.