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

Need help with your exam preparation?

Existing Quiz Clients Login here
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.   definite magnitude
B.   apparent magnitude
C.   absolute magnitude
D.   obvious 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.   impossible to tell
B.   farther
C.   exactly at 10 pc
D.   closer
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 ly
D.   1 pc
Question #4
Which of the following stars (identical in every possible way except distance) is closest to Earth?
A.   The star with apparent magnitude 5.
B.   The star with apparent magnitude 0.
C.   The star with apparent magnitude 3.
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.   distance to those stars.
C.   diameter of the stars.
D.   mass of the 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.   Castor is too faint to be seen and therefore its distance cannot be calculated.
B.   No, that would be incorrect.
C.   that is impossible to tell from the information given
D.   Yes, that's right.
Question #7
A parsec is equal to about light years.
A.   360
B.   42
C.   0.326
D.   3.26
Question #8
A red star would have spectral classification of
A.   K or M
B.   A or F
C.   O or B
D.   G or F
Question #9
The apparent magnitude of a star describes its
A.   size and chemical composition.
B.   magnification
C.   brightness as seen from Earth.
D.   distance
Question #10
The Sun's spectral classification is
A.   O0V or O0
B.   K4III or K4
C.   GII
D.   G2 or G2V
Question #11
A parsec is a measure of
A.   location.
B.   distance.
C.   time.
D.   brightness.
Question #12
A star's brightness as it appears from Earth is called its
A.   terrestrial magnitude.
B.   definitive magnitude.
C.   absolute magnitude.
D.   apparent magnitude.
Question #13
The parallax of a nearby star is the result of
A.   Earth's rotation on it axis.
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 revolution around the Sun.
Question #14
Stars that show the Fraunhofer lines of hydrogen most strongly are classified as
A.   G type stars.
B.   O type stars.
C.   A type stars.
D.   C type stars.
Question #15
The nearest stars to Earth have parallax angles that are the
A.   closest to 0 mas
B.   smallest
C.   most difficult to measure
D.   largest
Question #16
A star's parallax is measured to be 0.93". What is the distance to this star?
A.   A little more than 1 pc.
B.   1350 parsecs away
C.   A little less than 1 pc.
D.   1350 light years away
Question #17
The star Spica is around 250 ly away. What would its parallax angle be?
A.   0.013"
B.   0.013 mas
C.   13"
D.   1300 mas

Need help with your exam preparation?

Existing Quiz Clients Login here