Exploring the Cosmos - Class Test 2 - Life and Death of Stars (Part 2)
1. Globular clusters in our galaxy consist of groups of
very old stars.
very large stars.
newly born stars.
burnt out stars.
2. An open cluster consists of stars which are all
the same mass.
around the same age.
on the main sequence.
the same temperature.
3. Which of the following elements makes up a large fraction of a main sequence star?
Helium
Carbon
Iron
Oxygen
4. T Tauri stars are
remnant cores of dead stars.
optically visible in their cocoon.
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.
helium to carbon through the CNO cycle.
hydrogen to helium 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.
have a shorter lifetime than the Sun.
must be red giants.
7. Globular clusters mainly consist of groups of
newly born stars.
very large stars.
black holes.
very old stars.
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.
contain the oldest stars in our galaxy.
have a smaller density of stars than globular clusters.
are metal poor.
10. Stars in a single cluster differ widely in
mass.
age.
chemical composition.
distance.
11. Bok globules are
dense dust clouds out of which stars form.
small star clusters.
T Tauri stars.
Herbig Haro objects.
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