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