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