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
Protons
Electrons
Photons
3. How does a star of spectral type A0 differ from one of spectral type A5.
It is cooler.
It is smaller.
It is hotter.
It is bigger.
4. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
OBAFGKM
ABFGKMO
OABMFGK
5. The luminosity of a star is proportional to which power of its temperature?
Fifth
Third
Second
Fourth
6. The colour index of a star is indicative of its
Temperature
Diameter
Distance
Luminosity
7. What is our Sun’s spectral type?
A0
K9
G2
F6
8. What temperature range do Main Sequence stars fall into?
30K to 300K
300K to 3000K
30000K to 300000K
3000K to 30000K
9. What is the name given to the process by which elements are formed in stars?
Stellar nucleosynthesis
Stellar construction
Stellar manipulation
Stellar photosynthesis
10. Which element is the most abundant in the universe?
Hydrogen
Iron
Neon
Helium
11. Which process allows for the building up of elements heavier than iron?
The alpha-proces
Helium capture
Photodisintegration
Neutron capture
12. Which is the closest star to our own Sun?
Proxima Centauri
Betelgeuse
Epsilon Eridani
Barnard’s Star
13. The parallax of the nearest star is of the order of
1 arc minute
10 arc minutes
1 arc second
10 arc seconds
14. The star's annular parallax is 0. 4. What is its distance?
2.5 pc
2.5 Mpc
2.5 LY
2.5 AU
15. Roughly how many stars are there in our own galaxy?
1 million
100 billion
100 million
1 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 increases as the distance from observer to object increases.
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.
17. The sun's visible surface is called the
photosphere.
corona.
lithosphere.
chromosphere.
18. The surface temperature of the sun is approximately
50,000 K
10,000 K
6,000 K
3,000 K
19. The luminosity of a star is proportional to the _______ power of its temperature.
third
fourth
fifth
second
20. The colour of the H-alpha line of hydrogen is
green.
violet.
blue.
red.
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.
oxygen
hydrogen
carbon
helium
23. The hydrogen content of the average star is approximately
70%
50%
25%
5%
24. A helium nucleus contains _____ protons.
one
two
four
three
25. A star’s spectral type is most closely related to its
mass.
temperature.
radius.
luminosity.
26. A star of spectral type A0 is slightly ________ than one of spectral type A5.
bigger
cooler
hotter
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.
second
fifth
third
fourth
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?
Johann Bayer
Henry Draper
John Flamsteed
Joseph de Lalande
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