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.
Bok globules often emit infrared radiation.
Emission nebulae appear blue.
2. A nebula is a
cluster of small stars
cloud of gas and dust.
cluster of galaxies.
star about to collapse.
3. Hydrogen burning in stars
is a nuclear reaction only occurring in the most massive stars.
produces water vapour in interstellar space.
is a reaction in which hydrogen fuses with oxygen.
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.
helium to carbon through the triple alpha reaction.
hydrogen to helium through the proton-proton chain.
5. When the Sun becomes a Red Giant
its surface will become hotter than it is now.
it will eventually become a supernova.
it will produce iron and heavier elements in its core.
hydrogen fusion in its core will have ceased.
6. Type I and II supernovae
are both standard candles.
will occur in stars less massive than the Sun.
will occur in stars more massive than the Sun.
can reoccur.
7. White dwarfs are
very hot.
low magnitude stars.
very small in number.
the remains of stars much less massive than the Sun.
8. Neutrinos are
dangerous to human health.
particles of about the same mass as protons.
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
size of a neutron star.
maximum size of a white dwarf.
radius of the observable Universe.
size of a black hole.
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