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
around the same age.
on the main sequence.
the same temperature.
the same mass.
3. Which of the following elements makes up a large fraction of a main sequence star?
Iron
Helium
Carbon
Oxygen
4. T Tauri stars are
optically visible in their cocoon.
remnant cores of dead stars.
frequently strong infrared sources.
standard candles.
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
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
newly born stars.
very old stars.
black holes.
very large stars.
8. T Tauri stars are
remnant cores of dead stars.
frequently strong infrared sources.
optically visible in their cocoon.
standard candles.
9. Open clusters
contain the oldest stars in our galaxy.
are metal poor.
have a smaller density of stars than globular clusters.
are only found in distant galaxies.
10. Stars in a single cluster differ widely in
mass.
age.
chemical composition.
distance.
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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