AY 101-002                                                       Spring 2008
                                   QUIZ #8

Answer each of the following on a computer-gradeable answer sheet. Be
sure to fill in your name and student number (and blacken their circles as 
well). Write your seat number on a corner of the answer sheet.

1. A sunlike star becomes red giant
   a) while collapsing from interstellar gas and before starting fusion.
   B) WHEN ITS HAS EXHAUSTED THE HYDROGEN IN ITS CORE.
   c) when helium starts to fuse in its core.
   d) when it develops an iron core.

2. A star may form a planetary nebula
   a) at the end of its main-sequence lifetime.
   b) shortly before starting hydrogen fusion.
   c) at the start of its red-giant phase.
   D) AT THE END OF ITS RED-GIANT PHASE.

3. A white dwarf is roughly the size of
   a) the Moon.                         c) Jupiter.
   B) THE EARTH.                        d) the Sun.

4. Observations of the Crab Nebula gave the crucial connection between
   a) white dwarfs and supernova explosions.
   B) PULSARS AND SUPERNOVA EXPLOSIONS.
   c) gamma-ray bursts and white dwarfs.
   d) pulsars and white dwarfs.

5. One kind of supernova explosion is triggered by
   a) the violent winds of hot stars.
   b) the onset of helium fusion in a giant star.
   c) the helium flash in a red supergiant.
   D) THE PRODUCTION OF AN IRON-RICH CORE IN A MASSIVE STAR.

6. Interstellar dust can be detected by
   a) its emission at a radio wavelength of 21 centimeters.
   b) emission of visible light and absorption of infrared.
   C) ABSORPTION OF VISIBLE LIGHT AND EMISSION OF INFRARED.
   d) absorption of all wavelengths of radiation.

7. X-ray emission is a particularly good way to find black holes
   a) within only our Galaxy.
   b) when they are located far from other objects.
   C) WHEN THEY ARE SURROUNDED BY INFALLING MATERIAL.
   d) shortly after their formation.

8. The material most closely associated with the birth of stars is
   a) atomic hydrogen.                 c) supernova remnants.
   B) MOLECULAR CLOUDS.                d) ionized gas.

9. The longest-lasting stars are
   a) stars near one solar mass.      c) also the most massive.
   B) RED DWARFS.                     d) red giants.

10. A key advance of Einstein's General Relativity was that
   a) it could explain why the expansion of space is decelerating.
   b) Newton's laws apply to light as well as matter.
   c) measurements of time and space change depending on one's state of motion.
   D) GRAVITY RESULTS FROM A CURVATURE OF SPACE PRODUCED BY MASS.