Astronomy Chapter Eleven

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  • 1/19 Questions

    On a Hertzsprung-Russell diagram, where would we find white dwarfs?

    • Upper right
    • Lower right
    • Upper left
    • Lower left
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  • 2. 

    The spectral sequence in order of decreasing temperature is

    • OFBAGKM.

    • OBAGFKM.

    • OBAFGKM.

    • ABFGKMO.

    • BAGFKMO.

    Correct Answer
    A. OBAFGKM.
  • 3. 

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

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

    • Mass on the horizontal axis and luminosity on the vertical axis

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

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

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

    Correct Answer
    A. Surface temperature on the horizontal axis and luminosity on the vertical axis
  • 4. 

    What are the standard units for luminosity?

    • Watts

    • Joules

    • Newtons

    • Kilograms

    • Watts per second

    Correct Answer
    A. Watts
  • 5. 

    Which of the following correctly states the luminosity-distance formula?

    • Luminosity = apparent brightness / 4Ï€ x (distance)^2

    • Apparent brightness = luminosity / 4Ï€ x (distance)^2

    • Apparent brightness = luminosity x 4Ï€ x (distance)^2

    • Distance = luminosity / 4Ï€ x (apparent brightness)^2

    Correct Answer
    A. Apparent brightness = luminosity / 4Ï€ x (distance)^2
  • 6. 

    A star's luminosity is the

    • Apparent brightness of the star in our sky.

    • Surface temperature of the star.

    • Lifetime of the star.

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

    • Total amount of light that the star radiates each second.

    Correct Answer
    A. Total amount of light that the star radiates each second.
  • 7. 

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

    • Upper right

    • Lower right

    • Upper left

    • Lower left

    Correct Answer
    A. Lower right
  • 8. 

    Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?

    • Location where they are formed

    • Time they are formed

    • Luminosity they are formed with

    • Mass they are formed with

    • Color they are formed with

    Correct Answer
    A. Mass they are formed with
  • 9. 

    On a Hertzsprung-Russell diagram, where would we find red giant stars?

    • Upper right

    • Lower right

    • Upper left

    • Lower left

    Correct Answer
    A. Upper right
  • 10. 

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

    • 10 light-years.

    • 10 parsecs.

    • 0.1 light-year.

    • 0.1 parsec.

    • Impossible to determine.

    Correct Answer
    A. 10 parsecs.
  • 11. 

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

    • Upper right

    • Lower right

    • Upper left

    • Lower left

    Correct Answer
    A. Upper right
  • 12. 

    The spectral sequence sorts stars according to

    • Mass.

    • Surface temperature.

    • Luminosity.

    • Core temperature.

    • Radius.

    Correct Answer
    A. Surface temperature.
  • 13. 

    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?

    • Visual binary

    • Eclipsing binary

    • Spectroscopic binary

    • Double star

    • None of the above

    Correct Answer
    A. Visual binary
  • 14. 

    Which of the following luminosity classes refers to stars on the main sequence?

    • I

    • II

    • III

    • IV

    • V

    Correct Answer
    A. V
  • 15. 

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

    • Upper right

    • Lower right

    • Upper left

    • Lower left

    Correct Answer
    A. Upper right
  • 16. 

    Which of the following statements about an open cluster is true?

    • All stars in the cluster are approximately the same color.

    • All stars in the cluster are approximately the same age.

    • All stars in the cluster have approximately the same mass.

    • All stars in the cluster will evolve similarly.

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

    Correct Answer
    A. All stars in the cluster are approximately the same age.
  • 17. 

    Which of the following is true about low-mass stars compared to high-mass stars?

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

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

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

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

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

    Correct Answer
    A. Low-mass stars are cooler and less luminous than high-mass stars.
  • 18. 

    Cluster ages can be determined from

    • Main sequence fitting.

    • Main sequence turnoff.

    • Pulsating variable stars.

    • Spectroscopic binaries.

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

    Correct Answer
    A. Main sequence turnoff.
  • 19. 

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

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

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

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

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

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

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

Quiz Review Timeline (Updated): Mar 15, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 15, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 12, 2010
    Quiz Created by
    Moonshark13

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