Exploring the Cosmos - Class Test 2 - Life and Death of Stars (Part 2)
1. Globular clusters in our galaxy consist of groups of
burnt out stars.
very old stars.
very large stars.
newly born stars.
2. An open cluster consists of stars which are all
around the same age.
the same temperature.
the same mass.
on the main sequence.
3. Which of the following elements makes up a large fraction of a main sequence star?
Helium
Iron
Carbon
Oxygen
4. T Tauri stars are
remnant cores of dead stars.
standard candles.
optically visible in their cocoon.
frequently strong infrared sources.
5. The Sun generates heat by converting
helium to carbon through the triple alpha reaction.
hydrogen to helium through the triple alpha reaction.
helium to carbon through the CNO cycle.
hydrogen to helium through the proton-proton chain.
6. Main sequence stars with higher luminosity than the Sun
have a shorter lifetime than the Sun.
must be red giants.
have a lower surface temperature than the Sun.
are only observed in globular clusters.
7. Globular clusters mainly consist of groups of
newly born stars.
black holes.
very old stars.
very large stars.
8. T Tauri stars are
optically visible in their cocoon.
standard candles.
frequently strong infrared sources.
remnant cores of dead stars.
9. Open clusters
are only found in distant galaxies.
have a smaller density of stars than globular clusters.
contain the oldest stars in our galaxy.
are metal poor.
10. Stars in a single cluster differ widely in
distance.
chemical composition.
mass.
age.
11. Bok globules are
dense dust clouds out of which stars form.
small star clusters.
T Tauri stars.
Herbig Haro objects.
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