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