Astronomy Final Test 3

30 Questions | Total Attempts: 99

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Astronomy Quizzes & Trivia

Questions and Answers
  • 1. 
    The sun generates energy in its core by
    • A. 

      Fusing hydrogen into oxygen

    • B. 

      Fusing hydrogen into helium

    • C. 

      Fusing helium into hydrogen

    • D. 

      Fusing helium into carbon

    • E. 

      None of the above

  • 2. 
    We measure the luminosity of a star by measuring the star's
    • A. 

      Temperature and radius

    • B. 

      Mass and temperature

    • C. 

      Brightness and distance

    • D. 

      Age and temperature

    • E. 

      None of the above

  • 3. 
    Sunspots, flares, and prominences on the Sun are created by changes in the Sun's
    • A. 

      Fusion rate in the core

    • B. 

      Convection process near the surface

    • C. 

      Temperature distribution at the surface

    • D. 

      Magnetic field near the surface

    • E. 

      None of the above

  • 4. 
    What ends the red giant phase in the lifetime of a star like the Sun?
    • A. 

      The ignition of carbon in the star's core

    • B. 

      The helium flash

    • C. 

      The expulsion of the star's outer layers in a planetary nebula

    • D. 

      The formation of a white dwarf

    • E. 

      None of the above

  • 5. 
    What property of stars can only be measured if the star is part of a binary star system?
    • A. 

      Mass

    • B. 

      Luminoisity

    • C. 

      Temperature

    • D. 

      Radius

    • E. 

      All of the above

  • 6. 
    Which of the following object was NEVER on the main sequence at some point in the object's lifetime?
    • A. 

      White dwarf

    • B. 

      Brown dwarf

    • C. 

      Planetary nebula

    • D. 

      Red giant

    • E. 

      None of the above

  • 7. 
    What is the last material created by nuclear fusion in a star like the Sun?
    • A. 

      Helium

    • B. 

      Iron

    • C. 

      Carbon

    • D. 

      Neutrons

    • E. 

      None of the above

  • 8. 
    Which of the following statements is true for a red giant star?
    • A. 

      A star spends the majority of its lifetime in the red giant stage

    • B. 

      Red giants are cool stars yet still are quite luminous

    • C. 

      Red giants fuse hydrogen into helium in their cores

    • D. 

      Red giants are the largest stars that exist in the Universe

    • E. 

      None of the above

  • 9. 
    The Sun is an equilibrium state between what two competing forces?
    • A. 

      Fusion and fission

    • B. 

      Mass and energy

    • C. 

      Temperature and luminosity

    • D. 

      Fusion and electric repulsion

    • E. 

      Pressure and gravity

  • 10. 
    What is the temperature at the surface of the Sun?
    • A. 

      Fifteen thousand K

    • B. 

      Fifteen million K

    • C. 

      Sixty K

    • D. 

      Six thousand K

    • E. 

      None of the above

  • 11. 
    If two stars, a red super giant and a blue supergiant, have the same luminosity, then the blue star must be ____ than the red star
    • A. 

      Cooler

    • B. 

      Smaller

    • C. 

      More Massive

    • D. 

      Older

    • E. 

      All of the above

  • 12. 
    What is the correct order of stages in the lifetime of a low mass star?
    • A. 

      Protostar, main sequence, red giant, yellow giant, red supergiant, planetary nebula, white dwarf

    • B. 

      Main sequence, protostar, yellow giant, red giant, red supergiant, planetary nebula, white dwarf

    • C. 

      Protostar, red giant, main sequence, yellow giant, red supergiant, white dwarf, planetary nebula

    • D. 

      Main sequence, red giant, protostar, yellow giant, red supergiant, white dwarf, planetary nebula

    • E. 

      None of the above

  • 13. 
    If we see a blue star in the sky, which of the following do we KNOW must be true?
    • A. 

      The star must be far away

    • B. 

      The star must be young

    • C. 

      The star must be on the main sequence

    • D. 

      The star must be at the end of its lifetime

    • E. 

      None of the above

  • 14. 
    As a star like the Sun evolves into a red giant, its outer layers
    • A. 

      Expand and cool

    • B. 

      Contract and heat

    • C. 

      Expand and heat

    • D. 

      Turn into iron

    • E. 

      Turn into uranium

  • 15. 
    If the core of the Sun rose slightly in temperature causing the fusion rate to also increase slightly, what would happen next?
    • A. 

      The core would subsequently rise in temperature even more and shrink in size

    • B. 

      The outer layers of the Sun would shrink and heat up

    • C. 

      The core would expand in size and cool

    • D. 

      The outer layers of the Sun would expand and heat up

    • E. 

      None of the above

  • 16. 
    Which of the following stars has the highest surface temperature
    • A. 

      B3 III

    • B. 

      A4 V

    • C. 

      M7 I

    • D. 

      B7 V

    • E. 

      All of the above have the same surface temperature

  • 17. 
    We directly observe the Sun's core by detecting
    • A. 

      Helium created during nuclear fusion

    • B. 

      Convection dredging that brings cores material to the surface of the Sun

    • C. 

      Magnetic fluctuations in the Sun's corona

    • D. 

      Solar neutrinos that escape from the Sun's core

    • E. 

      None of the above

  • 18. 
    In an HR diagram, which type of star is in the upper left corer of the plot?
    • A. 

      Yellow giant

    • B. 

      White dwarf

    • C. 

      Red giant

    • D. 

      Blue supergiant

    • E. 

      Red supergiant

  • 19. 
    Sunspots appear darker because
    • A. 

      They are cooler than the surrounding material

    • B. 

      They do not emit any light

    • C. 

      The Sun's magnetic field suppresses visible light

    • D. 

      They are holes in the surface of the Sun

    • E. 

      None of the above

  • 20. 
    The most important parameter for determining the properties of a star is the star's
    • A. 

      Age

    • B. 

      Luminoisity

    • C. 

      Mass

    • D. 

      Temperature

    • E. 

      None of the above

  • 21. 
    The Sun's equator rotates faster than its poles in the process knowns as
    • A. 

      Alternative convection motion

    • B. 

      Coronal revolution

    • C. 

      Magnetic resonance differentiation

    • D. 

      Atypical spiral motion

    • E. 

      None of the above

  • 22. 
    Fill in the blanks: Nuclear fusion in the Sun converts _____ into ______ to generate energy
    • A. 

      4 hydrogen atoms: 1 carbon atom

    • B. 

      1 helium atom: 4 hydrogen atoms

    • C. 

      1 hydrogen atom: 4 helium atoms

    • D. 

      4 hydrogen atoms: 1 helium atom

    • E. 

      None of the above

  • 23. 
    Which of the following stars has the highest surface temperature?
    • A. 

      A yellow star

    • B. 

      A blue star

    • C. 

      An orange star

    • D. 

      A red star

    • E. 

      None of the above

  • 24. 
    The region where the Sun goes from transparent to opaque is called the
    • A. 

      Corona

    • B. 

      Chromosphere

    • C. 

      Radiative zone

    • D. 

      Core

    • E. 

      None of the above

  • 25. 
    The fraction of a star's light that reaches us here on Earth determines the star's _____
    • A. 

      Lumionisty

    • B. 

      Radius

    • C. 

      Brightness

    • D. 

      Mass

    • E. 

      All of the above

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