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.
burnt out stars.
very large stars.
newly born 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?
Carbon
Oxygen
Helium
Iron
4. T Tauri stars are
optically visible in their cocoon.
standard candles.
frequently strong infrared sources.
remnant cores of dead stars.
5. The Sun generates heat by converting
helium to carbon through the CNO cycle.
hydrogen to helium through the triple alpha reaction.
helium to carbon through the triple alpha reaction.
hydrogen to helium through the proton-proton chain.
6. Main sequence stars with higher luminosity than the Sun
are only observed in globular clusters.
have a shorter lifetime than the Sun.
must be red giants.
have a lower surface temperature 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
optically visible in their cocoon.
remnant cores of dead stars.
frequently strong infrared sources.
standard candles.
9. Open clusters
contain the oldest stars in our galaxy.
have a smaller density of stars than globular clusters.
are only found in distant galaxies.
are metal poor.
10. Stars in a single cluster differ widely in
mass.
age.
chemical composition.
distance.
11. Bok globules are
T Tauri stars.
small star clusters.
dense dust clouds out of which stars form.
Herbig Haro objects.
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