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Astronomy Chapter Eleven

19 Questions
Astronomy Quizzes & Trivia
Questions and Answers
  • 1. 
    Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?
    • A. 

      Location where they are formed

    • B. 

      Time they are formed

    • C. 

      Luminosity they are formed with

    • D. 

      Mass they are formed with

    • E. 

      Color they are formed with

  • 2. 
    What are the standard units for luminosity?
    • A. 

      Watts

    • B. 

      Joules

    • C. 

      Newtons

    • D. 

      Kilograms

    • E. 

      Watts per second

  • 3. 
    A star's luminosity is the
    • A. 

      Apparent brightness of the star in our sky.

    • B. 

      Surface temperature of the star.

    • C. 

      Lifetime of the star.

    • D. 

      Total amount of light that the star will radiate over its entire lifetime.

    • E. 

      Total amount of light that the star radiates each second.

  • 4. 
    If the distance between us and a star is doubled, with everything else remaining the same,the luminosity
    • A. 

      Is decreased by a factor of four, and the apparent brightness is decreased by a factor of four.

    • B. 

      Is decreased by a factor of two, and the apparent brightness is decreased by a factor of two.

    • C. 

      Remains the same, but the apparent brightness is decreased by a factor of two.

    • D. 

      Remains the same, but the apparent brightness is decreased by a factor of four.

    • E. 

      Is decreased by a factor of four, but the apparent brightness remains the same.

  • 5. 
    Which of the following correctly states the luminosity-distance formula?
    • A. 

      Luminosity = apparent brightness / 4π x (distance)^2

    • B. 

      Apparent brightness = luminosity / 4π x (distance)^2

    • C. 

      Apparent brightness = luminosity x 4π x (distance)^2

    • D. 

      Distance = luminosity / 4π x (apparent brightness)^2

  • 6. 
    Suppose you measure the parallax angle for a particular star to be 0.1 arcsecond. Thedistance to this star is
    • A. 

      10 light-years.

    • B. 

      10 parsecs.

    • C. 

      0.1 light-year.

    • D. 

      0.1 parsec.

    • E. 

      Impossible to determine.

  • 7. 
    The spectral sequence sorts stars according to
    • A. 

      Mass.

    • B. 

      Surface temperature.

    • C. 

      Luminosity.

    • D. 

      Core temperature.

    • E. 

      Radius.

  • 8. 
    The spectral sequence in order of decreasing temperature is
    • A. 

      OFBAGKM.

    • B. 

      OBAGFKM.

    • C. 

      OBAFGKM.

    • D. 

      ABFGKMO.

    • E. 

      BAGFKMO.

  • 9. 
    Which of the following terms is given to a pair of stars that appear to change positions in the sky, indicating that they are orbiting one another?
    • A. 

      Visual binary

    • B. 

      Eclipsing binary

    • C. 

      Spectroscopic binary

    • D. 

      Double star

    • E. 

      None of the above

  • 10. 
    Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
    • A. 

      Surface temperature on the horizontal axis and luminosity on the vertical axis

    • B. 

      Mass on the horizontal axis and luminosity on the vertical axis

    • C. 

      Surface temperature on the horizontal axis and radius on the vertical axis

    • D. 

      Mass on the horizontal axis and stellar age on the vertical axis

    • E. 

      Interior temperature on the horizontal axis and mass on the vertical axis

  • 11. 
    On a Hertzsprung-Russell diagram, where would we find stars that are cool and dim?
    • A. 

      Upper right

    • B. 

      Lower right

    • C. 

      Upper left

    • D. 

      Lower left

  • 12. 
    On a Hertzsprung-Russell diagram, where would we find stars that are cool and luminous?
    • A. 

      Upper right

    • B. 

      Lower right

    • C. 

      Upper left

    • D. 

      Lower left

  • 13. 
    On a Hertzsprung-Russell diagram, where would we find stars that have the largest radii?
    • A. 

      Upper right

    • B. 

      Lower right

    • C. 

      Upper left

    • D. 

      Lower left

  • 14. 
    On a Hertzsprung-Russell diagram, where would we find red giant stars?
    • A. 

      Upper right

    • B. 

      Lower right

    • C. 

      Upper left

    • D. 

      Lower left

  • 15. 
    On a Hertzsprung-Russell diagram, where would we find white dwarfs?
    • A. 

      Upper right

    • B. 

      Lower right

    • C. 

      Upper left

    • D. 

      Lower left

  • 16. 
    Which of the following luminosity classes refers to stars on the main sequence?
    • A. 

      I

    • B. 

      II

    • C. 

      III

    • D. 

      IV

    • E. 

      V

  • 17. 
    Which of the following is true about low-mass stars compared to high-mass stars?
    • A. 

      Low-mass stars are cooler and less luminous than high-mass stars.

    • B. 

      Low-mass stars are hotter and more luminous than high-mass stars.

    • C. 

      Low-mass stars are cooler but more luminous than high-mass stars.

    • D. 

      Low-mass stars are hotter but less luminous than high-mass stars.

    • E. 

      Low-mass stars have the same temperature and luminosity as high-mass stars.

  • 18. 
    Which of the following statements about an open cluster is true?
    • A. 

      All stars in the cluster are approximately the same color.

    • B. 

      All stars in the cluster are approximately the same age.

    • C. 

      All stars in the cluster have approximately the same mass.

    • D. 

      All stars in the cluster will evolve similarly.

    • E. 

      There is an approximately equal number of all types of stars in the cluster.

  • 19. 
    Cluster ages can be determined from
    • A. 

      Main sequence fitting.

    • B. 

      Main sequence turnoff.

    • C. 

      Pulsating variable stars.

    • D. 

      Spectroscopic binaries.

    • E. 

      Cluster ages can be determined from A) main sequence fitting. B) main sequence turnoff. C) pulsating variable stars. D) spectroscopic binaries. E) visual binaries.