Exploring the Cosmos - Degree Exam 2009 - Life and Death of Stars (Part 1)
1. Which of the following is not an observational class of binary star?
Visual
Parallactic
Spectroscopic
Photometric
2. The sum of the masses of a binary pair is proportional to what power of their orbital period, T?
1/T^2
1/T^4
1/T^3
1/T
3. How does the apparent brightness of a star vary with its luminosity?
The apparent brightness of a star cannot be measured.
The apparent brightness is not related to its luminosity.
The apparent brightness of a star decreases when its luminosity increases.
The apparent brightness of a star increases when its luminosity increases.
4. What value does our Sun have on the apparent magnitude scale?
-12.5
+6
-26.7
+30
5. Which spectral classification corresponds to the hottest stars?
A
O
G
F
6. How many elements are there currently in the periodic table?
10
154
113
81
7. What is the name of the process by which carbon atoms are created from the fusion of helium atoms?
The double alpha process.
Neutron capture.
The triple alpha process.
The alpha process.
8. Which of the following correctly lists the regions of the Sun, starting at its centre and working outwards.
Core, Radiation Zone, Convection Zone, Photosphere
Core, Radiation Zone, Photosphere, Convection Zone
Core, Photosphere, Radiation Zone, Convection Zone
Core, Photosphere, Convection Zone, Radiation Zone
9. What is the approximate temperature of the photosphere of our Sun?
15 million K
5 800 K
10 000 K
2 million K
10. How did Johan Bayer name the stars in the sky? He named them
based on their colour.
in the order he found them.
in terms of their relative brightness within constellations.
in terms of their co-ordinates in the sky.
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