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
corona
photosphere
2. Two isotopes of the same chemical have the same number of what in their nuclei?
Neutrons
Photons
Protons
Electrons
3. How does a star of spectral type A0 differ from one of spectral type A5.
It is cooler.
It is bigger.
It is hotter.
It is smaller.
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?
Third
Fifth
Fourth
Second
6. The colour index of a star is indicative of its
Luminosity
Distance
Diameter
Temperature
7. What is our Sun’s spectral type?
K9
F6
A0
G2
8. What temperature range do Main Sequence stars fall into?
30K to 300K
300K to 3000K
3000K to 30000K
30000K to 300000K
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?
Hydrogen
Helium
Neon
Iron
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?
Epsilon Eridani
Barnard’s Star
Proxima Centauri
Betelgeuse
13. The parallax of the nearest star is of the order of
10 arc minutes
10 arc seconds
1 arc minute
1 arc second
14. The star's annular parallax is 0. 4. What is its distance?
2.5 AU
2.5 LY
2.5 Mpc
2.5 pc
15. Roughly how many stars are there in our own galaxy?
100 billion
1 million
1 billion
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 increases 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 decreases as the distance from observer to object increases.
17. The sun's visible surface is called the
corona.
chromosphere.
lithosphere.
photosphere.
18. The surface temperature of the sun is approximately
10,000 K
3,000 K
6,000 K
50,000 K
19. The luminosity of a star is proportional to the _______ power of its temperature.
third
fifth
second
fourth
20. The colour of the H-alpha line of hydrogen is
green.
blue.
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.
carbon
helium
hydrogen
oxygen
23. The hydrogen content of the average star is approximately
25%
5%
70%
50%
24. A helium nucleus contains _____ protons.
three
two
four
one
25. A star’s spectral type is most closely related to its
mass.
radius.
temperature.
luminosity.
26. A star of spectral type A0 is slightly ________ than one of spectral type A5.
cooler
hotter
bigger
smaller
27. The sun's visible surface is called the
chromosphere.
photosphere.
corona
lithosphere.
28. The luminosity of a star is proportional to the _______ power of its temperature.
fifth
third
second
fourth
29. The central temperature of the sun is approximately
1,000,000 K
15,000,000 K
1,000 K
6,000 K
30. Roughly how many stars are there in our own galaxy?
1 billion
1 million
100 million
100 billion
31. Who developed the first systematic method for naming stars in 1603?
Johann Bayer
Joseph de Lalande
Henry Draper
John Flamsteed
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