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