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.
Emission nebulae appear blue.
Bok globules often emit infrared radiation.
Extinction nebulae can only be formed by black holes.
2. A nebula is a
star about to collapse.
cluster of galaxies.
cloud of gas and dust.
cluster of small stars
3. Hydrogen burning in stars
is a nuclear reaction only occurring in the most massive stars.
is a reaction in which hydrogen fuses with oxygen.
produces water vapour in interstellar space.
can occur via the proton-proton chain reaction.
4. The Sun generates heat by converting
helium to carbon through the CNO cycle.
hydrogen to helium through the triple alpha reaction.
hydrogen to helium through the proton-proton chain.
helium to carbon through the triple alpha reaction.
5. When the Sun becomes a Red Giant
it will produce iron and heavier elements in its core.
hydrogen fusion in its core will have ceased.
its surface will become hotter than it is now.
it will eventually become a supernova.
6. Type I and II supernovae
will occur in stars more massive than the Sun.
can reoccur.
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.
low magnitude stars.
very hot.
8. Neutrinos are
derived from Neutrons.
dangerous to human health.
produced in the centre of stars.
particles of about the same mass as protons.
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
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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