Exploring the Cosmos - Class Test 1 - Life and Death of Stars (Part 1)
1. What is the name of the Sun's visible surface?
lithosphere
corona
photosphere
chromosphere
2. Two isotopes of the same chemical have the same number of what in their nuclei?
Protons
Photons
Electrons
Neutrons
3. How does a star of spectral type A0 differ from one of spectral type A5.
It is smaller.
It is bigger.
It is cooler.
It is hotter.
4. The spectral sequence of stars in order of decreasing temperature is
OABMFGK
FGKMOAB
ABFGKMO
OBAFGKM
5. The luminosity of a star is proportional to which power of its temperature?
Third
Fifth
Fourth
Second
6. The colour index of a star is indicative of its
Luminosity
Temperature
Diameter
Distance
7. What is our Sun’s spectral type?
F6
A0
K9
G2
8. What temperature range do Main Sequence stars fall into?
30000K to 300000K
30K to 300K
3000K to 30000K
300K to 3000K
9. What is the name given to the process by which elements are formed in stars?
Stellar photosynthesis
Stellar manipulation
Stellar nucleosynthesis
Stellar construction
10. Which element is the most abundant in the universe?
Hydrogen
Iron
Helium
Neon
11. Which process allows for the building up of elements heavier than iron?
Neutron capture
Helium capture
Photodisintegration
The alpha-proces
12. Which is the closest star to our own Sun?
Epsilon Eridani
Barnard’s Star
Proxima Centauri
Betelgeuse
13. The parallax of the nearest star is of the order of
10 arc seconds
1 arc minute
10 arc minutes
1 arc second
14. The star's annular parallax is 0. 4. What is its distance?
2.5 pc
2.5 Mpc
2.5 LY
2.5 AU
15. Roughly how many stars are there in our own galaxy?
1 million
100 billion
100 million
1 billion
16. Which of the following statements is true?
The parallax of an object does not depend on the distance between observer and object.
The parallax of an object decreases as the distance from observer to object decreases.
The parallax of an object increases as the distance from observer to object increases.
The parallax of an object decreases as the distance from observer to object increases.
17. The sun's visible surface is called the
lithosphere.
chromosphere.
corona.
photosphere.
18. The surface temperature of the sun is approximately
50,000 K
10,000 K
6,000 K
3,000 K
19. The luminosity of a star is proportional to the _______ power of its temperature.
second
fourth
fifth
third
20. The colour of the H-alpha line of hydrogen is
blue.
green.
violet.
red.
21. Two isotopes of the same chemical have the same number of _____ in their nuclei.
protons
neutrons
electrons
photons
22. On the main sequence stars are powered by nuclear reactions termed ______ burning.
hydrogen
oxygen
helium
carbon
23. The hydrogen content of the average star is approximately
5%
50%
25%
70%
24. A helium nucleus contains _____ protons.
four
two
three
one
25. A star’s spectral type is most closely related to its
luminosity.
temperature.
radius.
mass.
26. A star of spectral type A0 is slightly ________ than one of spectral type A5.
bigger
smaller
cooler
hotter
27. The sun's visible surface is called the
corona
photosphere.
chromosphere.
lithosphere.
28. The luminosity of a star is proportional to the _______ power of its temperature.
second
fourth
fifth
third
29. The central temperature of the sun is approximately
1,000,000 K
1,000 K
15,000,000 K
6,000 K
30. Roughly how many stars are there in our own galaxy?
1 million
1 billion
100 million
100 billion
31. Who developed the first systematic method for naming stars in 1603?
Joseph de Lalande
Johann Bayer
John Flamsteed
Henry Draper
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