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