The chromosphere of the Sun

The chromosphere of the Sun
 
  a. is hotter than the photosphere.
  b. appears yellow-white in color during total solar eclipse.
  c. is the visible surface of the Sun.
  d. produces an absorption spectrum.
  e. all of the others.

Question 2

When Mars is located directly behind Earth with respect to the Sun in its orbit, it is
 
  a. at the midpoint in the sky between east and west at sunset.
  b. at the midpoint in the sky between east and west at midnight.
  c. at the midpoint in the sky between east and west at sunrise.
  d. at the midpoint in the sky between east and west at noon.
  e. not visible in the night sky.

Question 3

The corona and chromosphere of the Sun are believed to be heated by
 
  a. shock waves rising from below the photosphere.
  b. the solar wind.
  c. sunspots.
  d. magnetic carpets.
  e. differential rotation.

Question 4

Which of the following objects cannot transit (i.e., pass in front of) the Sun as seen from Jupiter?
 
  a. Mars
  b. Earth
  c. Saturn
  d. Mercury
  e. Venus