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