PreTeXt Sample Book: Abstract Algebra (SAMPLE ONLY)

<section xml:id="exercises-timed">
  <title>Exercises that are Timed</title>
  <p>
    This is a section that merely explains and holds an <tag>exercises</tag> division,
    which will be at the level of a <tag>subsection</tag>.
    There is a <attr>time-limit</attr> attribute on <tag>exercises</tag>,
    set to the value <c>10</c>,
    which implies (a) the collection of (two) exercises is a
    <q>timed exam</q>
    when hosted on Runestone,
    and (b) a student will have 10 minutes to complete the collection.
  </p>
  <p>
    Showing results, showing feedback,
    displaying a timer, and allowing pausing are all enabled by default.
    To disable any of these features,
    set the corresponding attributes on the <tag>exercises</tag> division,
    <attr>results</attr>, <attr>feedback</attr>,
    <attr>timer</attr>, <attr>pause</attr>,
    to the value <c>no</c>.
    As a test, we have turned off pausing.
    Don't panic!
  </p>
  <p>
    Of course, if you are not viewing this while online and hosted on a Runestone server,
    then these exercises will not look any different than in other places.
  </p>
  <p>
    (Since this is an unstructured division,
    the number of the <tag>exercises</tag> is not displayed when born.
    It does <em>have</em> a number,
    which is the same as the enclosing <tag>section</tag>.
    To wit: <xref ref="exercises-timed" /> versus <xref ref="timing-exercises" />.)
  </p>
  <exercises xml:id="timing-exercises" label="timed-exercises" time-limit="10" pause="no">
    <title>Timed Exercises</title>
    <introduction>
      <p>
        You have 10 minutes to do these exercises when hosted online on a Runestone server.
      </p>
    </introduction>
    <exercise label="vector-space-dimension-timed">
      <title>True/False</title>
      <idx>vector space</idx>
      <statement correct="no">
        <p>
          Every vector space has finite dimension.
        </p>
      </statement>
      <feedback>
        <p>
          The vector space of all polynomials with finite degree has a basis,
          <m>B = \{1,x,x^2,x^3,\dots\}</m>, which is infinte.
        </p>
      </feedback>
      <hint>
        <p>
          <m>P_n</m>, the vector space of polynomials with degree at most <m>n</m>,
          has dimension <m>n+1</m> by <xref ref="theorem-exponent-laws" />. [Cross-reference is just a demo,
          content is not relevant.] What happens if we relax the defintion and remove the parameter <m>n</m>?
        </p>
      </hint>
    </exercise>
    <exercise label="multiple-choice-not-randomized-timed">
      <title>Multiple-Choice, Not Randomized, One Answer</title>
      <idx>stop signs</idx>
      <statement>
        <p>
          What color is a stop sign?
        </p>
      </statement>





      <choices>
      <choice>
      <statement>
        <p>
          Green
        </p>
      </statement>
      <feedback>
        <p>
          Green means
          <q>go!</q>.
        </p>
      </feedback>
      </choice>
      <choice correct="yes">
      <statement>
        <p>
          Red
        </p>
      </statement>
      <feedback>
        <p>
          Red is universally used for prohibited activities or serious warnings.
        </p>
      </feedback>
      </choice>
      <choice>
      <statement>
        <p>
          White
        </p>
      </statement>
      <feedback>
        <p>
          White might be hard to see.
        </p>
      </feedback>
      </choice>
      </choices>
      <hint>
        <p>
          What did you see last time you went driving?
        </p>
      </hint>
      <hint>
        <p>
          Maybe go out for a drive?
        </p>
      </hint>
    </exercise>
  </exercises>
</section>