Exploring the Cosmos - Degree Exam 2012 - Galaxies and Large Scale Structure
1. Which of the following is not a characteristic of Population I stars
Population I stars are 'metal rich'.
Population I stars often have a bluish colour.
Population I stars are 'metal poor'.
Population I stars are often found in open clusters.
2. Which of the following items can be explained by the density wave theory?
Grand design galaxies
Flocculent galaxies
Elliptical galaxies
Irregular galaxies
3. Which of the following statements is correct?
Our galaxy can be classified as a quasar.
Our galaxy has never been active.
Our galaxy currently shows features of being an active Seyfert galaxy.
Our galaxy is currently not active, but has been active in the past.
4. Which of the following is not a characteristic of rich galaxy clusters?
Collisions of galaxies are likely to happen.
Contains a large fraction of spiral galaxies.
High density of galaxies.
The cluster at the centre is often formed by one or more giant elliptical galaxies.
5. Which of the following objects cannot be used as a standard candle for measuring distances?
RR Lyrae
Supernovae, Type Ia
Cepheids
Supernovae, Type II
6. Which of the following is the correct sorting for distance measurement methods from far to near?
Tully Fisher, Hubble’s law , Spectrospic parallax, parallax method.
Hubble’s law, Spectrospic parallax, parallax method, Tully Fisher.
Spectrospic parallax, Hubble’s law, parallax method, Tully Fisher.
Hubble’s law, Tully Fisher, Spectrospic parallax, parallax method.
7. Which of the following is a characteristic of elliptical galaxies?
Active stellar recycling.
Relatively strong emission of the 21cm line.
Relatively weak emission of the 21cm line.
Contains Population I and II stars.
8. Which of the following statements is correct?
Spiral galaxies are more common than irregular galaxies.
Elliptical galaxies are as common as spiral galaxies.
Spiral galaxies are as common as irregular galaxies.
Spiral galaxies are more common than elliptical galaxies.
9. Which of the following galaxy types features no disc?
Sba
Sa
S0
E0
10. Which of the following statements is incorrect?
Stars close to the galactic centre feature velocities of about 3 million miles per hour.
In the centre of our galaxy sits a super massive black hole of 2.6 million solar masses.
Star orbits around the galactic centre with a period as low as 15 years have been observed.
The super massive black hole at the galactic centre swallows on average 30 stars per year.
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