Exploring the Cosmos - Class Test 1 - Life and Death of Stars (Part 1)
1. What is the name of the Sun's visible surface?
photosphere
chromosphere
lithosphere
corona
2. Two isotopes of the same chemical have the same number of what in their nuclei?
Photons
Electrons
Protons
Neutrons
3. How does a star of spectral type A0 differ from one of spectral type A5.
It is smaller.
It is cooler.
It is bigger.
It is hotter.
4. The spectral sequence of stars in order of decreasing temperature is
OABMFGK
ABFGKMO
OBAFGKM
FGKMOAB
5. The luminosity of a star is proportional to which power of its temperature?
Second
Third
Fifth
Fourth
6. The colour index of a star is indicative of its
Distance
Luminosity
Temperature
Diameter
7. What is our Sun’s spectral type?
K9
G2
A0
F6
8. What temperature range do Main Sequence stars fall into?
30000K to 300000K
300K to 3000K
3000K to 30000K
30K to 300K
9. What is the name given to the process by which elements are formed in stars?
Stellar nucleosynthesis
Stellar photosynthesis
Stellar construction
Stellar manipulation
10. Which element is the most abundant in the universe?
Neon
Iron
Hydrogen
Helium
11. Which process allows for the building up of elements heavier than iron?
Neutron capture
Helium capture
The alpha-proces
Photodisintegration
12. Which is the closest star to our own Sun?
Barnard’s Star
Proxima Centauri
Epsilon Eridani
Betelgeuse
13. The parallax of the nearest star is of the order of
10 arc seconds
1 arc second
1 arc minute
10 arc minutes
14. The star's annular parallax is 0. 4. What is its distance?
2.5 Mpc
2.5 pc
2.5 AU
2.5 LY
15. Roughly how many stars are there in our own galaxy?
1 billion
100 billion
1 million
100 million
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.
photosphere.
corona.
chromosphere.
18. The surface temperature of the sun is approximately
10,000 K
6,000 K
50,000 K
3,000 K
19. The luminosity of a star is proportional to the _______ power of its temperature.
fifth
third
second
fourth
20. The colour of the H-alpha line of hydrogen is
red.
green.
blue.
violet.
21. Two isotopes of the same chemical have the same number of _____ in their nuclei.
photons
protons
neutrons
electrons
22. On the main sequence stars are powered by nuclear reactions termed ______ burning.
helium
oxygen
hydrogen
carbon
23. The hydrogen content of the average star is approximately
50%
5%
70%
25%
24. A helium nucleus contains _____ protons.
two
four
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.
hotter
smaller
cooler
bigger
27. The sun's visible surface is called the
lithosphere.
photosphere.
corona
chromosphere.
28. The luminosity of a star is proportional to the _______ power of its temperature.
second
fourth
third
fifth
29. The central temperature of the sun is approximately
1,000 K
6,000 K
15,000,000 K
1,000,000 K
30. Roughly how many stars are there in our own galaxy?
100 billion
1 million
1 billion
100 million
31. Who developed the first systematic method for naming stars in 1603?
Henry Draper
Johann Bayer
Joseph de Lalande
John Flamsteed
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