Astronomy Exam
Second Quarter, Academic
Dr Jamie Love
1997 - 2011
Hello and welcome to your exam. This will test your knowledge of the materials covered in lessons 13 to 24 (the Second Quarter) of this course.
Self Evaluation Test - Pretest info
When you choose an answer you will get a "pop-up" response indicating whether you got it right or wrong and providing feedback. This immediate feedback is a learning tool so read each reply carefully. I suggest that the first time you take the test, you simply stick with your original answers, complete the test and submit it for a grade. This will give you an idea of what you have learned so far and is more like a "regular" test. (Whatever that is. ) Your answers will be graded and each one will be scored Correct or Wrong. Once you have the score and the list of incorrect answers you can use your "Back Button" to return to your exam and correct your errors. This second time with the exam you can carefully read each response, learn from it and choose the right answer – then submit your perfect score for a final grade.
Self Evaluation Test
Choose the best answer by selecting one of the buttons. When you get to the bottom of the page, submit your answers.
1 : A body that accumulates about 3% of the Sun's mass is a ...
T Tauri.
star.
a protostar.
a planet.
2 : A young star cluster can be distinguished from an old star cluster by the fact that a younger cluster will have ...
more stars.
fewer stars.
less "nebulosity".
more "nebulosity".
3 : A(n) ___________________is a huge family of stars, probably formed from a huge nebula, whose own collective gravity is so massive that they will not drift apart.
globular cluster
open cluster
solar system
multistar system
4 : The Eddington limit ...
is the upper limit to the luminosity of a stable star of any given mass.
determines how many watts a star can produce.
can be used to calculate the energy output of an unstable star.
is all of the above.
5 : A photon of light produced in the Sun's core takes about 200,000 years to pass through the Sun's ...
convection zone.
radiative zone.
photosphere.
chromosphere.
6 : The ions, atoms and molecules on the surface of a star can be determined from the star's ...
temperature.
color.
emission spectrum.
absorption spectrum.
7 : A newly formed star, made mostly of hydrogen will be in which part of the H-R diagram?
Upper right.
Lower left.
Along the ZAMS line.
The Main Sequence.
8 : A small star will remain on the Main Sequence _____________ a large star.
longer than
less than
just as long as
twice as long as
9 : A white dwarf ...
no longer undergoes fusion.
is composed of very dense degenerate matter.
was briefly surrounded by a planetary nebula when the dwarf was new.
All the above.
10 : The Sun will one day ...
become a red giant.
undergo a helium flash.
become a white dwarf.
All the above.
11: A(n) _________________ is the region around a "magnetic planet" in which the charged particles of the solar wind are controlled by the planet's magnetic field rather than the Sun's magnetic field.
aurora
heliopause
magnetosphere.
magnetosheath
12 : Solar winds ...
are made of charged particles from the Sun.
cause sunspots.
occur every 11 years.
continue out to the next star.
13 : Chandrasekar's limit tells you ...
how luminous a stable star of a particular mass can be.
how small a star can be.
whether a dead star has enough mass to become a simple white dwarf or a neutron star (or black hole).
the speed of light.
14: A rapidly rotating neutron star whose magnetic pole is off-center to its axis of spin will appear to send out beams of light in regular, rapid bursts. This is called a(n) ...
solar wind.
pulsar.
eclipse.
"flickering star"
15 : The Schwartzchild radius is the radius of an object of known mass at which ...
it will become a neutron star.
it will explode as a supernova type II.
light cannot escape.
it will pulse.
16 : What is the smallest (non-fusing) mass that can contract itself, by its own gravity, below its Schwartzchild radius?
One Earth mass.
One solar mass.
Three solar masses.
6.7% solar masses.
17 : Which of these methods would be a useful way to detect a black hole?
The rapid orbit of a star around an invisible companion with a calculated mass of more than 3 solar masses.
A double image of a distant star produced by the bending of light caused by the hole's immense gravity.
Find a powerful source of X-rays and rule out any other likely sources for the X-rays such as pulsars.
All the above.
18 : According to Kepler's second law, a planet moves ______ around perihelion and ______ around aphelion.
slowest, fastest
fastest, slowest
in a circle, in an ellipse
correctly, incorrectly
19 : Kepler's third law explains why ...
the inferior planets have shorter sidereal periods than the superior planets.
the inferior planets have longer sidereal periods than the superior planets.
planets move in ellipses and not circles.
planetary orbits are inclined.
20 : A planet's orbital inclination will affect that planet's _____________, as seen from Earth.
zenith
Right Ascension
declination
synodic period
You can now submit your exam to for grading. If your answers were less than perfect you will receive a score and a list of Incorrect (and Correct) replies. Then you can use your "Back Button" to return to this page and correct your earlier errors. Once you have corrected all your earlier errors (by rechoosing a correct answer when you were told you are wrong), you will get a perfect score.
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