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.
is in the centre of the constellation Cancer.
contains a black hole.
surrounds the supernova SN1987A.
2. A globular cluster in our Galaxy is
an asterism like the Pleiades.
a constellation such as Orion.
a group of very young stars.
a group of very old stars.
3. 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.
4. The main sequence is
a nuclear reaction in very hot stars.
a line on a graph of luminosity against temperature.
OBAFGKMRN.
the succession of stages in the life of a star.
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 low magnitude stars.
are the remains of stars much less massive than the Sun.
are very hot.
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 nuclear reaction only occurring in the hottest stars.
is a reaction in which hydrogen fuses with oxygen.
8. One element not expected to be produced in the core of stars is
helium.
carbon.
gold.
silicon.
9. Gas clouds contract to form stars because of
gravity.
nuclear forces.
internal pressure.
electrical attraction.
10. Stars in a single cluster differ widely in
chemical composition.
distance.
mass.
age.
11. Which of the following elements is not expected to be common in the core of a white dwarf?
Silicon
Hydrogen
Carbon
Oxygen
12. The CNO cycle is a nuclear reaction which
produces 'metals'.
occurs in carbon white dwarfs.
occurs in stars with cores hotter than the Sun.
causes the helium flash.
13. The final state of a star depends mainly on its
chemical composition.
degeneracy.
mass.
magnitude.
14. T Tauri stars are
standard candles.
remnant cores of dead stars.
optically visible in their cocoon.
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.
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.
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.
radioactivity.
gravitational contraction.
17. If 4 hydrogen nuclei fuse to form a helium nucleus
the mass-energy increases by about 1%.
energy is absorbed.
the mass is conserved.
the mass drops by about 1%.
18. The Chandrasekhar limit is
the maximum mass of a white dwarf.
the radius of a black hole.
the maximum radius of a red giant.
around ten times the solar mass.
19. Type I and II supernovae
will occur in stars more massive than the Sun.
can reoccur.
will occur in stars less massive than the Sun.
are both standard candles.
20. Type Ia supernovae are
very bright, newly-formed stars.
are thought to be exploding white dwarfs.
caused by stars collapsing upon themselves.
have strong H lines.
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
Oxygen
Carbon
Silicon
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.
responsible for the formation of globular clusters.
an intermediate stage in the proton-proton chain reaction.
24. 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.
25. One element not expected to be produced in the core of stars is
gold.
silicon.
helium.
carbon.
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 radius of a black hole.
around ten times the solar mass.
the maximum mass of a white dwarf.
the maximum radius of a red giant.
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 size of a neutron star.
the maximum size of a white dwarf.
the radius of the observable Universe.
the size of a black hole.
30. 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.
31. The Pauli Exclusion Principle explains
the solar neutrino problem.
supernovae.
why white dwarfs are stable.
why neutron stars collapse.
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
carbon.
gold.
silicon.
helium.
34. The position of white dwarfs on a HR diagram is
at random points on the diagram.
to the lower left of the main sequence.
on the upper part of the main sequence.
to the right of the main sequence.
35. 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.
36. The CNO cycle is a nuclear reaction which
occurs in carbon white dwarfs.
causes the helium flash.
produces 'metals'.
occurs in stars with cores hotter than the Sun.
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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