Astronomy 120 - Stars and Galaxies » Fall 2022 » Unit 6 Quiz

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Question #1
The of a star is a measure of how bright the star actually is, regardless of how it might appear from Earth.
A.   absolute magnitude
B.   obvious magnitude
C.   definite magnitude
D.   apparent magnitude
Question #2
A star's apparent and absolute magnitudes are given below. m = +0.3 M = +4 Is this star closer than or further than 10 pc from the Earth?
A.   exactly at 10 pc
B.   closer
C.   farther
D.   impossible to tell
Question #3
If a parallax angle of one arcsecond is observed, then the star is at a distance of
A.   106 km
B.   1 AU
C.   1 pc
D.   1 ly
Question #4
Which of the following stars (identical in every possible way except distance) is closest to Earth?
A.   The star with apparent magnitude 0.
B.   The star with apparent magnitude 3.
C.   The star with apparent magnitude 5.
D.   The star with apparent magnitude 2.
Question #5
Measuring the parallax of stars is important to astronomers because it allows for the determination of
A.   velocity of the planets orbiting those stars.
B.   mass of the stars.
C.   diameter of the stars.
D.   distance to those stars.
Question #6
Castor (α Geminorum A), a star in the Gemini constellation, has an apparent magnitude of +1.93. Its absolute magnitude is +0.986. Would it be fair to say that Castor is less than 10pc from the Earth?
A.   that is impossible to tell from the information given
B.   No, that would be incorrect.
C.   Castor is too faint to be seen and therefore its distance cannot be calculated.
D.   Yes, that's right.
Question #7
A parsec is equal to about light years.
A.   42
B.   3.26
C.   0.326
D.   360
Question #8
A red star would have spectral classification of
A.   K or M
B.   O or B
C.   A or F
D.   G or F
Question #9
The apparent magnitude of a star describes its
A.   distance
B.   magnification
C.   size and chemical composition.
D.   brightness as seen from Earth.
Question #10
The Sun's spectral classification is
A.   GII
B.   G2 or G2V
C.   O0V or O0
D.   K4III or K4
Question #11
A parsec is a measure of
A.   distance.
B.   brightness.
C.   time.
D.   location.
Question #12
A star's brightness as it appears from Earth is called its
A.   apparent magnitude.
B.   definitive magnitude.
C.   absolute magnitude.
D.   terrestrial magnitude.
Question #13
The parallax of a nearby star is the result of
A.   Earth's revolution around the Sun.
B.   The star's motion along our line of sight (towards or away from us).
C.   The rotation rate of the galaxy.
D.   Earth's rotation on it axis.
Question #14
Stars that show the Fraunhofer lines of hydrogen most strongly are classified as
A.   C type stars.
B.   G type stars.
C.   A type stars.
D.   O type stars.
Question #15
The nearest stars to Earth have parallax angles that are the
A.   most difficult to measure
B.   closest to 0 mas
C.   smallest
D.   largest
Question #16
A star's parallax is measured to be 0.93". What is the distance to this star?
A.   1350 parsecs away
B.   A little more than 1 pc.
C.   1350 light years away
D.   A little less than 1 pc.
Question #17
The star Spica is around 250 ly away. What would its parallax angle be?
A.   0.013"
B.   13"
C.   1300 mas
D.   0.013 mas

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