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.
newly born stars.
very large stars.
2. An open cluster consists of stars which are all
around the same age.
the same mass.
the same temperature.
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
optically visible in their cocoon.
standard candles.
remnant cores of dead stars.
frequently strong infrared sources.
5. The Sun generates heat by converting
hydrogen to helium through the triple alpha reaction.
helium to carbon through the CNO cycle.
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
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
very large stars.
newly born stars.
very old stars.
black holes.
8. T Tauri stars are
remnant cores of dead stars.
standard candles.
frequently strong infrared sources.
optically visible in their cocoon.
9. Open clusters
are only found in distant galaxies.
have a smaller density of stars than globular clusters.
are metal poor.
contain the oldest stars in our galaxy.
10. Stars in a single cluster differ widely in
distance.
chemical composition.
age.
mass.
11. Bok globules are
T Tauri stars.
Herbig Haro objects.
small star clusters.
dense dust clouds out of which stars form.
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