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