Astronomy Exam 2 Part 3

10 Questions | Total Attempts: 108

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Astronomy Quizzes & Trivia

Astronomy exam part 3. Taken from astron. 100 exam 2.


Questions and Answers
  • 1. 
    21. Compared to a cool red main sequence star, a hot blue main sequence star has  
    • A. 

      A. more fuel and a longer life.

    • B. 

      B. more fuel and a shorter life.

    • C. 

      C. less fuel and a shorter life.

    • D. 

      D. less fuel and a longer life.

    • E. 

      E. You can’t say from the given information.

  • 2. 
    For a star with the sun’s mass, we expect that after all the hydrogen in the core is fused, the star will next become
    • A. 

      a nova

    • B. 

      A white dwarf

    • C. 

      A red giant

    • D. 

      A supergiant

    • E. 

      A supernova

  • 3. 
    Which spectral class star on the main sequence has the largest mass?
    • A. 

      M star

    • B. 

      O star

    • C. 

      A star

    • D. 

      G star

    • E. 

      F star

  • 4. 
    An observer far outside our galaxy would best describe our galaxy and the Sun’s position in it as a
    • A. 

      A. disk of stars with our Solar System near the edge.

    • B. 

      B. disk of stars centered on our Solar System.

    • C. 

      C. disk of stars with a bulge containing our Solar System.

    • D. 

      D. sphere of stars centered on our Solar System.

    • E. 

      E. sphere of stars with our Solar System near the edge.

  • 5. 
     For which of the following objects does Hubble’s Law work?
    • A. 

      A. Clouds in the Milky Way

    • B. 

      B. Distant galaxies

    • C. 

      C. Local group galaxies

    • D. 

      D. Nearby stars

    • E. 

      E. All of the above

  • 6. 
    . The Universe is said to be closed if
    • A. 

      A. the density of the Universe is less than the critical density.

    • B. 

      B. the Universe has a center and an edge.

    • C. 

      C. gravity is strong enough to stop the expansion in a finite time.

    • D. 

      D. the Hubble Constant is less than 50 km/s/Mpc.

    • E. 

      E. holiday shopping hours are restricted.

  • 7. 
    Which of the following is a characteristic of the halo component of the Milky Way?
    • A. 

      A. circular stellar orbits

    • B. 

      B. high metal abundance

    • C. 

      C. young stars

    • D. 

      D. randomly inclined stellar orbits

    • E. 

      E. active star formation regions

  • 8. 
    Most of the mass of a galaxy is
    • A. 

      A. contained in the massive O and B stars in the galaxy.

    • B. 

      B. contained in the H I regions of the galaxy.

    • C. 

      C. contained in the H II regions of the galaxy.

    • D. 

      D. contained in the dark matter of the galaxy.

    • E. 

      E. contained in the disk of the galaxy

  • 9. 
    Where is the center of the universe
    • A. 

      A. There is no center.

    • B. 

      B. the Earth

    • C. 

      C. the Sun

    • D. 

      D. the Milky Way

    • E. 

      E. the Big Bang

  • 10. 
    Younger stars have more heavy elements because
    • A. 

      A. old stars destroy heavy elements as they age.

    • B. 

      B. the heavy elements were made in previous generations of stars.

    • C. 

      C. young stars burn their nuclear fuels faster.

    • D. 

      D. heavy elements haven’t had time to settle to the core of these younger stars.

    • E. 

      E. all of the above.

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