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26 Nov 2019
11. What makes a red giant star so large?
ARed giants are rapidrotators, and centrifugal force pushes thesurface of the staroutwards.
BThe star has many timesmore mass than the Sun.
CThe hydrogen-burningshell is heating the envelope and making itexpand.
DThe helium-rich core hasexpanded, pushing the outer layers of thestar outwards.
12. A red dwarf is a
Ahot and dim mainsequence star.
Bcool and bright mainsequence star.
Chot and bright mainsequence star.
Dcool and dim mainsequence star.
13. Some red dwarfs are fully
Aconductive.
Bconvective.
Cradiative.
Ddevoid of nuclearfusion.
14. Which of the following pieces of information do we NOT needtoinfer the density of a star?
Adistance
Bflux
Ctemperature
Dage
Emass
15. We can measure the age of a planetary nebula by
Adividing thenebula's size by its expansion speed.
Busing the mass-luminosityrelationship for the white dwarf at thecenter.
Cdividing its distance bythe speed of light.
Dlooking at the ages ofstars nearby.
16. The maximum mass of a white dwarf is
A1.4 solar masses andknown as the Oppenheimer-Volkov limit.
B1.4 solar masses andknown as the Chandrasekhar limit.
C3 solar masses and knownas the Oppenheimer-Volkov limit.
D3 solar masses and knownas the Chandrasekhar limit.
17. The interstellar medium is mostly _______ followedby________.
AHydrogen;Helium.
BHelium;Hydrogen.
CCarbon;Hydrogen.
DHydrogen;Carbon.
ECorbon; Oxygen.
18. The interstellar medium has a cool component measuredvia_________ observations and a hot component revealed by________observations.
AX-ray;optical
BX-ray; infrared
CX-ray;gamma-ray
Doptical; X-ray
Einfrared; X-ray
19. The interstellar medium has a cool component which is_______its hot component.
Adenserthan
Bless dense than
Cas dense as
20. Which of the following processes will NOT cause a gas cloudtocollapse?
Aionization fromyoung stars
Bsupernovaexplosions
Cgalacticrotation
Dthe expansion of theUniverse
11. What makes a red giant star so large?
ARed giants are rapidrotators, and centrifugal force pushes thesurface of the staroutwards.
BThe star has many timesmore mass than the Sun.
CThe hydrogen-burningshell is heating the envelope and making itexpand.
DThe helium-rich core hasexpanded, pushing the outer layers of thestar outwards.
12. A red dwarf is a
Ahot and dim mainsequence star.
Bcool and bright mainsequence star.
Chot and bright mainsequence star.
Dcool and dim mainsequence star.
13. Some red dwarfs are fully
Aconductive.
Bconvective.
Cradiative.
Ddevoid of nuclearfusion.
14. Which of the following pieces of information do we NOT needtoinfer the density of a star?
Adistance
Bflux
Ctemperature
Dage
Emass
15. We can measure the age of a planetary nebula by
Adividing thenebula's size by its expansion speed.
Busing the mass-luminosityrelationship for the white dwarf at thecenter.
Cdividing its distance bythe speed of light.
Dlooking at the ages ofstars nearby.
16. The maximum mass of a white dwarf is
A1.4 solar masses andknown as the Oppenheimer-Volkov limit.
B1.4 solar masses andknown as the Chandrasekhar limit.
C3 solar masses and knownas the Oppenheimer-Volkov limit.
D3 solar masses and knownas the Chandrasekhar limit.
17. The interstellar medium is mostly _______ followedby________.
AHydrogen;Helium.
BHelium;Hydrogen.
CCarbon;Hydrogen.
DHydrogen;Carbon.
ECorbon; Oxygen.
18. The interstellar medium has a cool component measuredvia_________ observations and a hot component revealed by________observations.
AX-ray;optical
BX-ray; infrared
CX-ray;gamma-ray
Doptical; X-ray
Einfrared; X-ray
19. The interstellar medium has a cool component which is_______its hot component.
Adenserthan
Bless dense than
Cas dense as
20. Which of the following processes will NOT cause a gas cloudtocollapse?
Aionization fromyoung stars
Bsupernovaexplosions
Cgalacticrotation
Dthe expansion of theUniverse
