Why Do I Have to Use a Number 2 Pencil?

The video explains the historical and technical reasons behind the use of #2 pencils in standardized tests. It covers the evolution of test scoring machines from electrical circuits to optical mark sensing devices, highlighting the role of graphite in pencils. The video also discusses how modern scoring machines have advanced, allowing for more flexibility in pencil usage, though it advises sticking to #2 pencils for important exams.

Why is a #2 pencil traditionally recommended for filling out test bubbles?

• It is the cheapest pencil available.

• It is the only pencil that can write on test paper.

• It is the most commonly available pencil.

• It is believed to be the best for machine readability.

Who invented the first automated test scoring machine?

• Alexander Graham Bell

• Nikola Tesla

• Reynold Johnson

• Thomas Edison

What property of graphite made it suitable for the first automated scoring machines?

• Its magnetic properties

• Its ability to change color

• Its ability to conduct electricity

• Its ability to dissolve in water

How did optical mark sensing machines detect answers?

• By detecting sound

• By detecting pressure

• By detecting light

• By detecting heat

Why are #2 pencils preferred for optical mark sensing machines?

• They are the lightest pencils available.

• They make marks that are dark enough to be detected but light enough to be erased.

• They are the most colorful pencils.

• They are the most expensive pencils.