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?
Protons
Photons
Neutrons
Electrons
3. How does a star of spectral type A0 differ from one of spectral type A5.
It is smaller.
It is hotter.
It is bigger.
It is cooler.
4. The spectral sequence of stars in order of decreasing temperature is
OBAFGKM
ABFGKMO
FGKMOAB
OABMFGK
5. The luminosity of a star is proportional to which power of its temperature?
Fourth
Third
Fifth
Second
6. The colour index of a star is indicative of its
Luminosity
Temperature
Diameter
Distance
7. What is our Sun’s spectral type?
K9
A0
F6
G2
8. What temperature range do Main Sequence stars fall into?
300K to 3000K
30K to 300K
3000K to 30000K
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?
Hydrogen
Neon
Iron
Helium
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?
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 pc
2.5 LY
2.5 Mpc
2.5 AU
15. Roughly how many stars are there in our own galaxy?
100 million
1 million
1 billion
100 billion
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 increases.
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.
17. The sun's visible surface is called the
chromosphere.
corona.
lithosphere.
photosphere.
18. The surface temperature of the sun is approximately
50,000 K
6,000 K
3,000 K
10,000 K
19. The luminosity of a star is proportional to the _______ power of its temperature.
fifth
fourth
third
second
20. The colour of the H-alpha line of hydrogen is
violet.
blue.
red.
green.
21. Two isotopes of the same chemical have the same number of _____ in their nuclei.
protons
electrons
neutrons
photons
22. On the main sequence stars are powered by nuclear reactions termed ______ burning.
oxygen
carbon
helium
hydrogen
23. The hydrogen content of the average star is approximately
70%
25%
50%
5%
24. A helium nucleus contains _____ protons.
three
two
one
four
25. A star’s spectral type is most closely related to its
luminosity.
mass.
temperature.
radius.
26. A star of spectral type A0 is slightly ________ than one of spectral type A5.
smaller
hotter
bigger
cooler
27. The sun's visible surface is called the
chromosphere.
corona
photosphere.
lithosphere.
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
15,000,000 K
6,000 K
1,000,000 K
1,000 K
30. Roughly how many stars are there in our own galaxy?
1 billion
1 million
100 billion
100 million
31. Who developed the first systematic method for naming stars in 1603?
Henry Draper
Johann Bayer
John Flamsteed
Joseph de Lalande
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