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