Sample Questions

1. The lobes of a Double-Lobed radio galaxy are roughly _____ in diameter.
• 60 parsecs
• 600 parsecs
• 6000 parsecs
• 60,000 parsecs
• 600,000 parsecs
2. The difference between Seyfert Type I and II galaxies is:
• the strength of their emission lines
• their distance from the Earth
• whether they are viewed from the top or the side
• the size of the black hole at the center
• the strength of their absorption lines
3. One main difference between BL Lac objects and Seyfert galaxies is
• BL Lac objects always emit more intense radiation than Seyferts
• We can see the accretion disk in BL Lac objects (it is obscured in Seyferts)
• BL Lac objects are known to have smaller central black holes than Seyferts
• BL Lac objects never have jets (Seyferts almost always do)
• BL Lac objects are associated with elliptical galaxies (and Seyferts with spirals)
4. Quasars are important because:
• their light tells us about the very early universe
• they are the only active galaxies intense enough to be observed directly
• they are the only active galaxies powered by massive black holes
• they are distributed uniformly accross the sky
• they were discovered relatively recently
5. Which of the following is best explained by the "Outside-In" theory?
   • Most star formation takes place in the spiral arms.
   • There is a bar at the center of our galaxy.
   • Population I stars have higher metal content than Population II stars.
   • The Sun is a Population I star.
   • The Milky Way is a Spiral Galaxy.

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