Astronomy Exam 2 Part 2
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Astronmy exam part 2. Taken from Astron 100 class.
- 1.Which of the following nuclear fuels does an one solar mass star use over the course of its entire evolution?
- A.
A. hydrogen and helium
- B.
B. hydrogen
- C.
C. hydrogen, helium and carbon
- D.
D. hydrogen, helium, carbon, and neon
- E.
E. hydrogen, helium, carbon, neon, and oxygen
- 2.The most important characteristic of a star for determining its lifetime is its
- A.
A. temperature
- B.
B. color
- C.
C. distance from the main sequence
- D.
D. radius
- E.
E. mass
- 3.Which element from the following list does not liberate energy when ”burned” via nuclear fusion in the center of a star?
- A.
A. helium
- B.
B. carbon.
- C.
C. iron.
- D.
D. silicon.
- E.
E. neon.
- 4.A neutron star is expected to spin rapidly because
- A.
A. it has high orbital velocities.
- B.
B. it has high densities.
- C.
C. it has high temperatures.
- D.
D. it conserved angular momentum when it collapsed.
- E.
E. the energy from the supernova explosion that formed them made them spin faster.
- 5.Which of the following is true of pulsars?
- A.
A. They have very strong magnetic fields.
- B.
B. They rotate very rapidly.
- C.
C. They are neutron stars.
- D.
D. They have a density approximately equal to the density of an atomic nucleus.
- E.
E. All of the above are true.
- 6.A white dwarf is supported against collapse by
- A.
A. neutron drip.
- B.
B. neutrino pressure.
- C.
C. electron degeneracy pressure.
- D.
D. neutron degeneracy pressure.
- E.
E. a central black hole.
- 7.In a supernova explosion
- A.
A. the star may shine as brightly as billions of stars.
- B.
B. elements heavier than iron are formed.
- C.
C. material that later formed the Earth and us humans was distributed between the stars
- D.
D. matter is ejected at tens of thousands of kilometers per second.
- E.
E. All of the above.
- 8.Which of the following stars is most dense?
- A.
A. a supergiant star
- B.
B. a white dwarf
- C.
C. a main sequence star
- D.
D. a giant star
- E.
E. the sun
- 9.If two stars have the same spectral type, then they must have approximately the same
- A.
A. mass.
- B.
B. parallactic distance.
- C.
C. surface temperature.
- D.
D. chemical composition.
- E.
E. luminosity.
- 10.Which of the following can escape from inside the event horizon of a black hole?
- A.
A. particles of matter.
- B.
B. particles of antimatter.
- C.
C. visible light.
- D.
D. X-rays.
- E.
E. None of the above.
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