Astronomy Exam 2 Part 3
Astronomy exam part 3. Taken from astron. 100 exam 2.
- 1.21. Compared to a cool red main sequence star, a hot blue main sequence star has
- A.
A. more fuel and a longer life.
- B.
B. more fuel and a shorter life.
- C.
C. less fuel and a shorter life.
- D.
D. less fuel and a longer life.
- E.
E. You can’t say from the given information.
- 2.For a star with the sun’s mass, we expect that after all the hydrogen in the core is fused, the star will next become
- A.
a nova
- B.
A white dwarf
- C.
A red giant
- D.
A supergiant
- E.
A supernova
- 3.Which spectral class star on the main sequence has the largest mass?
- A.
M star
- B.
O star
- C.
A star
- D.
G star
- E.
F star
- 4.An observer far outside our galaxy would best describe our galaxy and the Sun’s position in it as a
- A.
A. disk of stars with our Solar System near the edge.
- B.
B. disk of stars centered on our Solar System.
- C.
C. disk of stars with a bulge containing our Solar System.
- D.
D. sphere of stars centered on our Solar System.
- E.
E. sphere of stars with our Solar System near the edge.
- 5.For which of the following objects does Hubble’s Law work?
- A.
A. Clouds in the Milky Way
- B.
B. Distant galaxies
- C.
C. Local group galaxies
- D.
D. Nearby stars
- E.
E. All of the above
- 6.. The Universe is said to be closed if
- A.
A. the density of the Universe is less than the critical density.
- B.
B. the Universe has a center and an edge.
- C.
C. gravity is strong enough to stop the expansion in a finite time.
- D.
D. the Hubble Constant is less than 50 km/s/Mpc.
- E.
E. holiday shopping hours are restricted.
- 7.Which of the following is a characteristic of the halo component of the Milky Way?
- A.
A. circular stellar orbits
- B.
B. high metal abundance
- C.
C. young stars
- D.
D. randomly inclined stellar orbits
- E.
E. active star formation regions
- 8.Most of the mass of a galaxy is
- A.
A. contained in the massive O and B stars in the galaxy.
- B.
B. contained in the H I regions of the galaxy.
- C.
C. contained in the H II regions of the galaxy.
- D.
D. contained in the dark matter of the galaxy.
- E.
E. contained in the disk of the galaxy
- 9.Where is the center of the universe
- A.
A. There is no center.
- B.
B. the Earth
- C.
C. the Sun
- D.
D. the Milky Way
- E.
E. the Big Bang
- 10.Younger stars have more heavy elements because
- A.
A. old stars destroy heavy elements as they age.
- B.
B. the heavy elements were made in previous generations of stars.
- C.
C. young stars burn their nuclear fuels faster.
- D.
D. heavy elements haven’t had time to settle to the core of these younger stars.
- E.
E. all of the above.
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