Exploring the Cosmos - Class Test 2 - Life and Death of Stars (Part 2)
1. Globular clusters in our galaxy consist of groups of
very large stars.
newly born stars.
very old stars.
burnt out 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?
Iron
Carbon
Oxygen
Helium
4. T Tauri stars are
optically visible in their cocoon.
frequently strong infrared sources.
remnant cores of dead stars.
standard candles.
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
must be red giants.
are only observed in globular clusters.
have a lower surface temperature than the Sun.
have a shorter lifetime than the Sun.
7. Globular clusters mainly consist of groups of
black holes.
very large stars.
newly born stars.
very old stars.
8. T Tauri stars are
frequently strong infrared sources.
optically visible in their cocoon.
standard candles.
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
age.
distance.
chemical composition.
mass.
11. Bok globules are
Herbig Haro objects.
small star clusters.
dense dust clouds out of which stars form.
T Tauri stars.
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