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Stellar Evolution: Protostar Stage 3/18
Test Description: This review concentrates on the protostar stage of star formation.
Instructions: Answer all questions to get your test result.
1) During the evolution of a star, what event takes at least a million years to occur?
A
initial contraction
B
final contraction
C
successive contraction
D
secondary contraction
2) After the initial contraction, what happens to the temperature of this gaseous body?
A
rises
B
falls
C
fluctuates
D
pulsates
3) After the initial contraction and when the temperature rises high enough, energy is radiated from the surface in the form of:
A
long-wavelength orange light
B
long-wavelength red light
C
short-wavelength red light
D
short-wavelength blue light
4) The gaseous body that continues to form, now appears as a large red object called a:
A
red dwarf
B
red giant
C
protostar
D
red star port
5) A protostar is a developing star not yet hot enough to engage in the process of:
A
atomic emission
B
nuclear fusion
C
nuclear fission
D
atomic transmission
6) As gravity continues to collapse the forming star, what part is heated more intensely than the outer layer?
A
corona
B
asthenosphere
C
core
D
lithosphere
7) When the core of a protostar reaches 10 million degrees Kelvin, the pressure is so great that the nuclear fusion of what gas begins?
A
hydrogate
B
hydrogen
C
heliogen
D
hydroxide
8) The heat from the process of hydrogen fusion causes the motion of the gases to:
A
pulsate
B
stay constant
C
decrease
D
increase
9) As the motion of the gases increases, it causes and increase in the outward:
A
gas pressure
B
gas decomposition
C
gas exchange
D
gas production
10) What does the forming star become when the outward pressure equals the inward force of gravity?
A
unstable main-sequence star
B
unstable secondary white dwarf
C
stable secondary red giant
D
stable main-sequence star
*select an answer for all questions
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