EXERCISES, LESSON 1
INSTRUCTIONS. The following exercises are to be answered by marking the lettered
response that best answers the question or best completes the incomplete statement.
After you have completed all the exercises, turn to "Solutions to Exercises" at the end of
the lesson and check your answers.
The pre-x-ray studies made in the 1600's by the English physician William
Gilbert involved an investigation of:
a. The distinct types of electricity, which he termed, vitreous and resinous.
b. The similarities and differences between magnetism and electricity.
c. The sulphur ball.
d. Atmospheric electricity and friction.
Otto Van Guericke's contribution to pre-x-ray discoveries was:
a. The discovery of electrons.
b. The coining of the term electricity, an anglicized version of the Greek word for
c. The discovery that so-called vitreous electricity repelled objects with the same
charge, while attracting those with the so-called resinous charge.
d. The invention of the first electrical machine, an air pump that could remove air
from a vessel or tube.
In 1733, the French scientist, Charles Francois Du Fay discovered that:
a. Barium platinocyanide crystals would phosphoresce when struck by energy.
c. Electrically charged vitreous particles were attracted to resinous particles.
d. Positive charges move through a wire toward the negative charge.