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