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Ch 25 2/2
Test Description: 2/2
Instructions: Answer all questions to get your test result.
1) A star is said to be born when
A
a protostar reaches a temperature high enough for nuclear fusion to begin
B
pressure within a protostar becomes so great that a supernova occurs
C
a dark, cool interstellar cloud begins to contract
D
a red giant collapses on itself and becomes a black hole
2) Which force is most responsible for the formation of a star
A
interstellar force
B
gravity
C
nuclear force
D
electromagnetic force
3) Massive stars terminate in a brilliant explosion called a
A
protostar
B
neutron star
C
red giant
D
supernova
4) All stars, regardless of size, eventually
A
run out of fuel and collapse
B
turn into black dwarfs
C
explode
D
become black holes
5) In the cores of extremely hot red giants, nuclear reactions convert helium to
A
hydrogen
B
argon
C
carbon
D
lead
6) When a main sequences star has exhausted the fuel in tis cores, it becomes a
A
black dwarf
B
red giant
C
black hole
D
neutron star
7) Where is our sun located in the Milky Way
A
at the exact center of the galactic nuclues
B
at the tip of one of the spiral arms
C
in the galactic halo
D
within one of the spiral arms
8) According to Hubble\'s Law, galaxies are retreating at a speed that is proportional to their
A
orientation
B
mass
C
galactic position
D
distance
9) Based on the observed red shifts in the spectral lines of distant galaxies, astonomers conclude that
A
the universe is expanding
B
the universe is contracting
C
the universe is smaller than once believed
D
Earth is at the center of the universe
10) Greater red shifts in the spectra of glaxies indicate
A
faster speeds
B
higher temperatures
C
slower speeds
D
lower temperatures
*select an answer for all questions
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