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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
successive contraction
B
initial contraction
C
secondary contraction
D
final contraction
2) After the initial contraction, what happens to the temperature of this gaseous body?
A
fluctuates
B
rises
C
falls
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
short-wavelength blue light
B
long-wavelength orange light
C
short-wavelength red light
D
long-wavelength red light
4) The gaseous body that continues to form, now appears as a large red object called a:
A
red dwarf
B
red star port
C
protostar
D
red giant
5) A protostar is a developing star not yet hot enough to engage in the process of:
A
nuclear fission
B
atomic transmission
C
nuclear fusion
D
atomic emission
6) As gravity continues to collapse the forming star, what part is heated more intensely than the outer layer?
A
lithosphere
B
asthenosphere
C
core
D
corona
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
heliogen
B
hydrogate
C
hydroxide
D
hydrogen
8) The heat from the process of hydrogen fusion causes the motion of the gases to:
A
stay constant
B
increase
C
decrease
D
pulsate
9) As the motion of the gases increases, it causes and increase in the outward:
A
gas production
B
gas exchange
C
gas pressure
D
gas decomposition
10) What does the forming star become when the outward pressure equals the inward force of gravity?
A
stable secondary red giant
B
unstable main-sequence star
C
unstable secondary white dwarf
D
stable main-sequence star
*select an answer for all questions
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