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