AST 1002
Test 3, Fall 2005
QQ 1 Which of the following energy sources can be important in 
stars but isn't important for the Sun at present?
AA S 1 (1) gravitational potential energy
(2) chemical energy
(3) nuclear energy
(4) NVA
(5) NVA

QQ 2 The process by which energy is transported from the Sun's 
core, where it's produced, through the inner part of the Sun is 
AA S 1 (1) radiation (photons)
(2) convection
(3) conduction
(4) NVA
(5) NVA

QQ 3 Sunspots are 
AAS 1 (1) darker than the rest of the photosphere because 
they're cooler
(2) completely dark
(3) brighter than the rest of the photosphere because they're 
hotter
(4) NVA
(5) NVA

QQ 4 In which region of the Sun's atmosphere do we find plages?
AA S 1 (1) chromosphere
(2) photosphere
(3) corona
(4) NVA
(5) NVA

QQ 5 With the "butterfly" diagram, we see that the first 
sunspots of each new cycle appear 
AA S 1 (1) at latitudes moderately far from the Sun's equator
(2) at or very near the Sun's equator
(3) near the Sun's poles
(4) NVA
(5) NVA

QQ 6 Which star is brighter, Star A with apparent magnitude 
4.3 or Star B with apparent magnitude 6.5?
AA S 1 (1) Star A
(2) Star B
(3) [can't tell without more information]
(4) NVA
(5) NVA

QQ 7 The Harvard spectral classification, in order of 
increasing temperature, is 
AA S 1 (1) MKGFABO
(2) OBAFGKM
(3) ABFGKMO
(4) NVA
(5) NVA

QQ 8 The largest stars of a given Harvard class have MK  
luminosity class 
AA S 1 (1) I
(2) V
(3) X
(4) NVA
(5) NVA

QQ 9 Which of the following is a basic property of a 
star?
AA S 1 (1) mass
(2) color index
(3) spectral type
(4) NVA
(5) NVA

QQ 10 The radius of a star can be found 
AA S 1 (1) with an interferometer if its distance is known 
and not too great
(2) if it's a member of a visual binary whose distance is 
known
(3) if it's a member of an eclipsing and single-line 
spectroscopic binary 
(4) NVA
(5) NVA

QQ 11 The red giant region in the Hertzsprung-Russell 
diagram is located in the 
AA S 1 (1) upper right
(2) upper left
(3) lower left
(4) NVA
(5) NVA

QQ 12 The main sequence stars with the highest masses 
are the ones 
AA S 1 (1) at the top end
(2) at the bottom end 
(3) near the middle
(4) NVA
(5) NVA

QQ 13 An open or galactic cluster that has a main 
sequence turnoff near the top is 
AA S 1 (1) very young
(2) medium age
(3) relatively old
(4) NVA
(5) NVA

QQ 14 Molecular cloud regions where stars form are 
AA S 1 (1) cold and dense
(2) cold and low density
(3) warm and dense
(4) NVA
(5) NVA

QQ 15 Which of the following depends entirely on 
density and not on temperature?
AA S 1 (1) electron degeneracy pressure
(2) radiation pressure
(3) gas pressure
(4) NVA
(5) NVA

QQ 16 The upper limit on the mass of a main 
sequence star is set by 
AA S 1 (1) radiation pressure making the star 
unstable
(2) electron degeneracy pressure preventing the onset 
of fusion
(3) the maximum mass of a molecular cloud
(4) NVA
(5) NVA

QQ 17 Stars on the upper end of the main sequence 
generate energy by which nuclear fusion process?
AA S 1 (1) carbon or CNO cycle
(2) proton-proton chain
(3) triple-alpha process
(4) NVA
(5) NVA

QQ 18 During which phase of a star's evolution does it 
have helium fusion in its core?
AA S 1 (1) horizontal branch
(2) main sequence
(3) asymptotic giant branch
(4) NVA
(5) NVA

QQ 19 Which kind of single star -- not a member of a 
close binary system -- can produce a supernova remnant?
AA S 1 (1) massive star
(2) solar mass star like the Sun
(3) low-mass star
(4) NVA
(5) NVA

QQ 20 Which kind of binary star system best exemplifies 
the Algol paradox?
AA S 1 (1) a 4 solar mass main sequence star with a 1 
solar mass subgiant
(2) a 5 solar mass giant with a 1 solar mass main 
sequence star
(3) a 1 solar mass white dwarf with a 0.5 solar mass 
white dwarf
(4) NVA
(5) NVA

QQ 21 A Type Ia or white dwarf supernova is formed when 
a white dwarf in a close binary system 
AA S 1 (1) has mass transferred from its companion, a 
giant or supergiant, so that it exceeds the Chandrasekhar 
limit
(2) has mass transferred from its companion, a giant or 
supergiant, which piles up until it reaches the temperature 
for hydrogen fusion
(3) runs into its white dwarf companion star, putting the 
two together over the Chandrasekhar limit
(4) NVA
(5) NVA

QQ 22 A pulsar is a 
AA S 1 (1) rotating magnetic neutron star
(2) rotating magnetic white dwarf
(3) pulsating (expanding and contracting) white dwarf 
(4) NVA
(5) NVA

QQ 23 The Schwarzschild radius depends on 
AA S 1 (1) only the mass of the object
(2) the mass and temperature of the object
(3) the mass and luminosity of the object
(4) NVA
(5) NVA

QQ 24 Cygnus X-1 is the best known example of a 
AA S 1 (1) stellar black hole
(2) supermassive black hole
(3) primordial black hole
(4) NVA
(5) NVA

QQ 25 The Sun is located in the Milky Way's 
AA S 1 (1) disk
(2) central bulge
(3) halo
(4) NVA
(5) NVA

QQ 26 The orbits of stars in the Milky Way's disk 
are 
AA S 1 (1) rotational, i.e. in the same direction 
and near the central plane of the disk
(2) random in direction and tilt as well as highly eccentric 
(3) near the central plane of the disk but either 
clockwise or anticlockwise, randomly
(4) NVA
(5) NVA

QQ 27 Which of the following objects belongs to 
Population II?
AA S 1 (1) a globular cluster
(2) an O star in a spiral arm
(3) the Sun
(4) NVA
(5) NVA

QQ 28 Which population tends to have the greater 
abundance of "metals"?
AA S 1 (1) Population I
(2) Population II
(3) [They have the same abundance of "metals."]
(4) NVA
(5) NVA

QQ 29 The source of the large amount of energy 
radiated from the galactic center is apparently a 
AA S 1 (1) supermassive black hole
(2) giant star cluster
(3) supernova
(4) NVA
(5) NVA

QQ 30 A spiral galaxy that has a large central 
bulge and tightly wound spiral arms but no bar 
has a Hubble type of 
AA S 1 (1) Sa
(2) Sc
(3) S0
(4) NVA
(5) NVA

QQ 31 Which type of galaxy consists almost 
exclusively of Population II stars?
AA S 1 (1) elliptical
(2) spiral
(3) irregular
(4) NVA
(5) NVA

QQ 32 Which is the correct interpretation of the 
Hubble Law?
AA S 1 (1) space is expanding, carrying galaxies farther 
apart from each other
(2) the galaxies are flying away from the site of a 
giant explosion that occurred right where we are
(3) the more massive a black hole is, the larger its 
gravitational redshift
(4) NVA
(5) NVA

QQ 33 Observations of Type Ia or white dwarf supernovae 
tell us that the Universe's expansion is 
AA S 1 (1) speeding up
(2) slowing down more and more gradually 
(3) slowing down and will eventually stop and reverse 
itself
(4) NVA
(5) NVA