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