Exploring the Cosmos - Class Test 3 - Life and Death of Stars (Part 2)
1. The Crab Nebula is of interest because it
surrounds the supernova SN1987A.
is in the centre of the constellation Cancer.
contains a pulsar.
contains a black hole.
2. A globular cluster in our Galaxy is
a constellation such as Orion.
an asterism like the Pleiades.
a group of very old stars.
a group of very young stars.
3. Type I and II supernovae
can reoccur.
are both standard candles.
will occur in stars less massive than the Sun.
will occur in stars more massive than the Sun.
4. The main sequence is
a line on a graph of luminosity against temperature.
the succession of stages in the life of a star.
OBAFGKMRN.
a nuclear reaction in very hot stars.
5. An open cluster in our Galaxy is
a group like the Pleiades.
a constellation such as Orion.
most likely to be found in the galactic halo.
a group of newly formed stars.
6. White dwarfs
are very hot.
are very small in number.
are the remains of stars much less massive than the Sun.
are low magnitude stars.
7. Hydrogen burning in stars
produces water vapour in interstellar space.
is a nuclear reaction only occurring in the hottest stars.
can occur in the proton-proton chain reaction.
is a reaction in which hydrogen fuses with oxygen.
8. One element not expected to be produced in the core of stars is
carbon.
helium.
silicon.
gold.
9. Gas clouds contract to form stars because of
internal pressure.
nuclear forces.
electrical attraction.
gravity.
10. Stars in a single cluster differ widely in
chemical composition.
distance.
age.
mass.
11. Which of the following elements is not expected to be common in the core of a white dwarf?
Carbon
Silicon
Oxygen
Hydrogen
12. The CNO cycle is a nuclear reaction which
produces 'metals'.
occurs in carbon white dwarfs.
causes the helium flash.
occurs in stars with cores hotter than the Sun.
13. The final state of a star depends mainly on its
chemical composition.
mass.
degeneracy.
magnitude.
14. T Tauri stars are
optically visible in their cocoon.
remnant cores of dead stars.
standard candles.
frequently strong infrared sources.
15. Given that the radius of the Sun is about 700,000 km
energy from fusion appears almost instantly at the photosphere.
it takes a few hours for light to travel from the core to the photosphere.
energy from fusion takes about 1 million years to travel this distance.
light takes 2 to 3 seconds to travel from the core to the photosphere.
16. Protostars heat up mostly due to
nuclear fission.
radioactivity.
gravitational contraction.
nuclear fusion.
17. If 4 hydrogen nuclei fuse to form a helium nucleus
the mass-energy increases by about 1%.
energy is absorbed.
the mass drops by about 1%.
the mass is conserved.
18. The Chandrasekhar limit is
around ten times the solar mass.
the radius of a black hole.
the maximum radius of a red giant.
the maximum mass of a white dwarf.
19. Type I and II supernovae
are both standard candles.
will occur in stars less massive than the Sun.
can reoccur.
will occur in stars more massive than the Sun.
20. Type Ia supernovae are
very bright, newly-formed stars.
have strong H lines.
are thought to be exploding white dwarfs.
caused by stars collapsing upon themselves.
21. When the Sun becomes a Red Giant
hydrogen fusion in its core will have ceased.
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.
22. Which of the following elements is not expected to be common in the core of a white dwarf?
Carbon
Oxygen
Silicon
Hydrogen
23. The triple-alpha reaction is
responsible for the formation of globular clusters.
an intermediate stage in the Carbon-Oxygen-Nitrogen cycle.
a nuclear reaction in which helium fuses to form carbon.
an intermediate stage in the proton-proton chain reaction.
24. The supernova SN1987A
emitted gravitational radiation which was detected on Earth.
was at the same position as a previously catalogued star.
is the most distant supernova seen until now.
was seen in the nearby Andromeda galaxy.
25. One element not expected to be produced in the core of stars is
helium.
gold.
silicon.
carbon.
26. The supernova SN1987A
was seen in the nearby Andromeda galaxy.
was at the same position as a previously catalogued star.
emitted gravitational radiation which was detected on Earth.
is the most distant supernova seen until now.
27. The Chandrasekhar limit is
the radius of a black hole.
the maximum radius of a red giant.
the maximum mass of a white dwarf.
around ten times the solar mass.
28. Black holes
cannot be directly observed.
are the final stages of stars like the Sun.
are detected as dark clouds at the centre of galaxies.
are caused absorption of light in cold, dense nebulae.
29. The Schwarzschild radius gives
the size of a neutron star.
the maximum size of a white dwarf.
the size of a black hole.
the radius of the observable Universe.
30. Type I and II supernovae
will occur in stars less massive than the Sun.
can reoccur.
will occur in stars more massive than the Sun.
are both standard candles.
31. The Pauli Exclusion Principle explains
why white dwarfs are stable.
the solar neutrino problem.
why neutron stars collapse.
supernovae.
32. The final state of a star depends mainly on its
degeneracy.
chemical composition.
mass.
magnitude.
33. One element not expected to be produced in the core of stars is
gold.
silicon.
carbon.
helium.
34. The position of white dwarfs on a HR diagram is
at random points on the diagram.
to the right of the main sequence.
on the upper part of the main sequence.
to the lower left of the main sequence.
35. 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.
36. The CNO cycle is a nuclear reaction which
occurs in stars with cores hotter than the Sun.
occurs in carbon white dwarfs.
causes the helium flash.
produces 'metals'.
37. Black holes
can only exist at the centres of galaxies.
are massive neutron stars.
exert a strong gravitational pull.
are also called accretion disks.
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