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