Stellar Structure
1.
From the fact that the average density of the Sun is near
that of water, while the atmospheric density is very low, we may conclude that
the interior of the Sun has a
a.
high mass
b.
high density
c.
low temperature
d.
low density.
2.
Stars are spherical because of
a.
the high temperature in the interior
b.
their large size
c.
their hydrogen composition
d.
gravity
e.
their nuclear energy generation.
3.
When you heat up a gas in a container, the
a.
density increases
b.
pressure increases
c.
temperature decreases
d.
particles move more slowly
4.
If the interior temperature of a star decreases, the star
will
a.
do nothing __________ that is, remain
in the same
b.
contract
c.
expand
d.
cease to exist as a star but cool off
to become a planet.
5.
The fundamental quantity which determines a star's central
pressure and temperature is
a.
mass
b.
luminosity
c.
surface temperature
d.
chemical composition
e.
radius.
6.
The Russell-Vogt theorem states that the properties of a
star at any given age depend completely upon the star's
a.
luminosity and radius
b.
mass and luminosity
c.
mass, chemical composition, and radius
d.
radius, and chemical composition
e.
mass and chemical composition.
7.
Low mass stars burn hydrogen in the _______; massive stars
burn hydrogen in the _______.
a.
proton-proton chain; proton-proton
chain
b.
carbon-nitrogen-oxygen cycle;
carbon-nitrogen-oxygen cycle
c.
proton-proton chain;
carbon-nitrogen-oxygen cycle
d.
carbon-nitrogen-oxygen cycle;
proton-proton chain
e.
triple-alpha reaction; proton-proton
chain.
8.
For stars like the Sun energy is transported by _____ in the
core and by _____ in the envelope.
a.
radiation, radiation
b.
convection, radiation
c.
convection, convection
d.
radiation, convection
9.
For massive stars, energy is transported by _____ in the
core and by _____in the envelope.
a.
radiation, radiation
b.
convection, radiation
c.
radiation, convection
d.
radiation, radiation.
10. The lifetime
of a star is determined by its initial
a.
temperature and luminosity
b.
temperature and radius
c.
temperature and mass
d.
mass and luminosity
e.
mass and radius.
11. Stars evolve
because of changes in
a.
chemical composition of the core
b.
luminosity of the star
c.
mass of the star
d.
chemical composition of the surface
e.
surface temperature.
12. The evolution
of stars in a binary system may differ from that of a single star because
a.
two stars are more massive than one
star
b.
one star may transfer mass to the other
c.
two stars have a higher combined
temperature than single stars
d.
two stars have a higher luminosity than
single stars.
13. In a binary
star system, the star loosing mass will evolve more ______, and the star
gaining matter will evolve more ______.
a.
rapidly, rapidly
b.
rapidly, slowly
c.
slowly, slowly
d.
slowly, rapidly.*
14. Which of the
following is NOT a necessary ingredient in the construction of a theoretical
star model?
a.
a balance between gravity and gas
pressure
b.
a knowledge of the star's position and
motion in space
c.
a knowledge of the star's mass and
chemical composition
d.
a balance between the star's luminosity
and the amount of energy generated