Exploring the Cosmos - Degree Exam 2010 - Life and Death of Stars (Part 2)
1. Which one of the following statements is TRUE?
Extinction nebulae can only be formed by black holes.
Reflection nebulae emit light from ionising hydrogen.
Emission nebulae appear blue.
Bok globules often emit infrared radiation.
2. A nebula is a
cloud of gas and dust.
cluster of galaxies.
star about to collapse.
cluster of small stars
3. Hydrogen burning in stars
produces water vapour in interstellar space.
is a reaction in which hydrogen fuses with oxygen.
can occur via the proton-proton chain reaction.
is a nuclear reaction only occurring in the most massive stars.
4. 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.
5. When the Sun becomes a Red Giant
it will produce iron and heavier elements in its core.
it will eventually become a supernova.
its surface will become hotter than it is now.
hydrogen fusion in its core will have ceased.
6. Type I and II supernovae
will occur in stars less massive than the Sun.
will occur in stars more massive than the Sun.
can reoccur.
are both standard candles.
7. White dwarfs are
very small in number.
low magnitude stars.
the remains of stars much less massive than the Sun.
very hot.
8. Neutrinos are
produced in the centre of stars.
dangerous to human health.
particles of about the same mass as protons.
derived from Neutrons.
9. Black holes
are also called accretion disks.
can only exist at the centres of galaxies.
exert a strong gravitational pull.
are massive neutron stars.
10. The Schwarzschild radius gives the
size of a black hole.
radius of the observable Universe.
maximum size of a white dwarf.
size of a neutron star.
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