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