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
corona
lithosphere
2. Two isotopes of the same chemical have the same number of what in their nuclei?
Electrons
Neutrons
Photons
Protons
3. How does a star of spectral type A0 differ from one of spectral type A5.
It is hotter.
It is cooler.
It is bigger.
It is smaller.
4. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
OABMFGK
ABFGKMO
OBAFGKM
5. The luminosity of a star is proportional to which power of its temperature?
Third
Fourth
Second
Fifth
6. The colour index of a star is indicative of its
Temperature
Distance
Diameter
Luminosity
7. What is our Sun’s spectral type?
K9
A0
G2
F6
8. What temperature range do Main Sequence stars fall into?
300K to 3000K
3000K to 30000K
30000K to 300000K
30K to 300K
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
Neon
Iron
Helium
11. Which process allows for the building up of elements heavier than iron?
The alpha-proces
Photodisintegration
Helium capture
Neutron capture
12. Which is the closest star to our own Sun?
Barnard’s Star
Betelgeuse
Epsilon Eridani
Proxima Centauri
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 pc
2.5 Mpc
15. Roughly how many stars are there in our own galaxy?
100 billion
100 million
1 billion
1 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
chromosphere.
photosphere.
lithosphere.
corona.
18. The surface temperature of the sun is approximately
3,000 K
10,000 K
6,000 K
50,000 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
red.
blue.
violet.
green.
21. Two isotopes of the same chemical have the same number of _____ in their nuclei.
protons
photons
electrons
neutrons
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
5%
50%
70%
25%
24. A helium nucleus contains _____ protons.
four
one
three
two
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.
cooler
hotter
bigger
smaller
27. The sun's visible surface is called the
corona
photosphere.
lithosphere.
chromosphere.
28. The luminosity of a star is proportional to the _______ power of its temperature.
third
fifth
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?
100 million
1 billion
1 million
100 billion
31. Who developed the first systematic method for naming stars in 1603?
John Flamsteed
Henry Draper
Joseph de Lalande
Johann Bayer
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