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