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ASTRO 7N Exam 2 includes accurate and
verified questions covering fundamental
astronomy concepts such as the solar system,
phases of the Moon, planetary motion,
gravity, light and telescopes, and the
historical development of astronomical
models. Desi
A high-luminosity star...
A. is always at a larger distance than a low-luminosity star
B. emits more light than a low-luminosity star
C. is always redder than a star with a lower luminosity
D. is at a lower temperature than a low-luminosity star
E. is always at a smaller distance than a low-luminosity
star - . . ANSWER ✔ ✔B
If a red giant appears the same brightness as a red main
sequence star, which one is further away?
A. the red giant
B. we cannot tell
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C. it depends on the phase of the moon
D. the main sequence star
E. they are at the same distance - . . ANSWER ✔ ✔A
The heaviest nuclei of all are formed...
A. during helium burning
B. as part of the p-p chain
C. during the carbon burning
D. during supernova explosion
E. during all stages of stellar evolution of massive stars - . .
ANSWER ✔ ✔D
Fill in the blank in the following chemical reaction that
occurs in the Sun: Hydrogen-2 + proton = + energy:
A. hydrogen-2
B. Hydrogen-1
C. Helium-3
D. Carbon-12
E. Helium - 4 - . . ANSWER ✔ ✔C
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Which of the following has the smallest radius?
A. type A main sequence star
B. main sequence star with surface temperature 8000K
C. type K main sequence star
D. white dwarf
E. neutron star - . . ANSWER ✔ ✔E
Why does the main sequence part of a star's life end?
A. the helium in the core is exhausted
B. the gravitational force is no longer large enough to
balance the pressure
C. The hydrogen in the core is exhausted
D. the temperature drops so that nuclear reactions are no
longer possible
E. much of the mass of the star has evaporated - . .
ANSWER ✔ ✔C
Which of the following will have the shortest lifetime on
the main sequence?
A. main sequence star with surface temperature 20000K
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B. main sequence star with surface temperature 3000K
C. main sequence star with luminosity one tenth that of
the sun
D. the sun
E. main sequence star with mass 2 times the sun's - . .
ANSWER ✔ ✔A
Many of the brightest 100 stars viewed from Earth are not
on the main sequence (even though most stars are)
because:
A. only high mass stars formed near to us in the Galaxy
B. the most luminous stars are giants and supergiants that
have already finished their main sequence lifetimes.
C. our region of the galaxy is very young
D. the main sequence is the shortest part of a star's life so
stars do not spend much time there
E. our region of the galaxy is very old - . . ANSWER ✔ ✔B
A 2-solar-mass main sequence star is at the same distance
as a 0.2-solar-mass main sequence star. Which star
appears brighter?
A. depends on the phase of the moon
ASTRO 7N Exam 2 includes accurate and
verified questions covering fundamental
astronomy concepts such as the solar system,
phases of the Moon, planetary motion,
gravity, light and telescopes, and the
historical development of astronomical
models. Desi
A high-luminosity star...
A. is always at a larger distance than a low-luminosity star
B. emits more light than a low-luminosity star
C. is always redder than a star with a lower luminosity
D. is at a lower temperature than a low-luminosity star
E. is always at a smaller distance than a low-luminosity
star - . . ANSWER ✔ ✔B
If a red giant appears the same brightness as a red main
sequence star, which one is further away?
A. the red giant
B. we cannot tell
,2|Page
C. it depends on the phase of the moon
D. the main sequence star
E. they are at the same distance - . . ANSWER ✔ ✔A
The heaviest nuclei of all are formed...
A. during helium burning
B. as part of the p-p chain
C. during the carbon burning
D. during supernova explosion
E. during all stages of stellar evolution of massive stars - . .
ANSWER ✔ ✔D
Fill in the blank in the following chemical reaction that
occurs in the Sun: Hydrogen-2 + proton = + energy:
A. hydrogen-2
B. Hydrogen-1
C. Helium-3
D. Carbon-12
E. Helium - 4 - . . ANSWER ✔ ✔C
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Which of the following has the smallest radius?
A. type A main sequence star
B. main sequence star with surface temperature 8000K
C. type K main sequence star
D. white dwarf
E. neutron star - . . ANSWER ✔ ✔E
Why does the main sequence part of a star's life end?
A. the helium in the core is exhausted
B. the gravitational force is no longer large enough to
balance the pressure
C. The hydrogen in the core is exhausted
D. the temperature drops so that nuclear reactions are no
longer possible
E. much of the mass of the star has evaporated - . .
ANSWER ✔ ✔C
Which of the following will have the shortest lifetime on
the main sequence?
A. main sequence star with surface temperature 20000K
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B. main sequence star with surface temperature 3000K
C. main sequence star with luminosity one tenth that of
the sun
D. the sun
E. main sequence star with mass 2 times the sun's - . .
ANSWER ✔ ✔A
Many of the brightest 100 stars viewed from Earth are not
on the main sequence (even though most stars are)
because:
A. only high mass stars formed near to us in the Galaxy
B. the most luminous stars are giants and supergiants that
have already finished their main sequence lifetimes.
C. our region of the galaxy is very young
D. the main sequence is the shortest part of a star's life so
stars do not spend much time there
E. our region of the galaxy is very old - . . ANSWER ✔ ✔B
A 2-solar-mass main sequence star is at the same distance
as a 0.2-solar-mass main sequence star. Which star
appears brighter?
A. depends on the phase of the moon
