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