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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
secondary contraction
C
final contraction
D
successive contraction
2) After the initial contraction, what happens to the temperature of this gaseous body?
A
falls
B
pulsates
C
fluctuates
D
rises
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 red light
B
short-wavelength red light
C
short-wavelength blue light
D
long-wavelength orange 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
red giant
D
protostar
5) A protostar is a developing star not yet hot enough to engage in the process of:
A
atomic transmission
B
nuclear fusion
C
atomic emission
D
nuclear fission
6) As gravity continues to collapse the forming star, what part is heated more intensely than the outer layer?
A
corona
B
lithosphere
C
core
D
asthenosphere
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
heliogen
C
hydrogen
D
hydroxide
8) The heat from the process of hydrogen fusion causes the motion of the gases to:
A
pulsate
B
increase
C
stay constant
D
decrease
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
unstable secondary white dwarf
B
stable main-sequence star
C
unstable main-sequence star
D
stable secondary red giant
*select an answer for all questions
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