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.
newly born stars.
very large 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
Iron
Oxygen
Carbon
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 proton-proton chain.
helium to carbon through the triple alpha reaction.
hydrogen to helium through the triple alpha reaction.
6. Main sequence stars with higher luminosity than the Sun
have a shorter lifetime than the Sun.
must be red giants.
are only observed in globular clusters.
have a lower surface temperature than the Sun.
7. Globular clusters mainly consist of groups of
very large stars.
newly born stars.
black holes.
very old stars.
8. T Tauri stars are
standard candles.
optically visible in their cocoon.
remnant cores of dead stars.
frequently strong infrared sources.
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.
mass.
age.
11. Bok globules are
Herbig Haro objects.
small star clusters.
T Tauri stars.
dense dust clouds out of which stars form.
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