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