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