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General Science and Ability | Exercise 3
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What prevents a white dwarf from collapsing to a black hole?
Fission of complex elements releases heat
The highly compressed neutrons exert degeneracy pressure.
The highly compressed electrons exert degeneracy pressure.
Fusion of complex elements generates heat
In order from the hottest to the coolest stars, the order of the stellar spectral sequence is
Modern cosmology supposes that the Universe came from a "big bang" event about 13 billion years ago. Evidence for this is
all of these answers.
the cosmic background radiation
the Hubble expansion
the uniformity of the abundance of hydrogen and helium
The proton proton chain
is a three step process which converts some mass to energy as helium nuclei are formed.
is the runaway reaction that produces the fission of iron during a supernova explosion.
adds protons together until a massive carbon nucleus is produced at the core of the Sun.
produces chains of protons which are then broken apart to produce the Sun's energy.
Even if a "wormhole" could be constructed for interstellar travel, it would be dangerous to use because
There would be no way back from the other side.
Tidal forces would crush ships entering it.
Objects might spontaneously fly out of it.
Worms are unpleasant.
Hubble's Law enables astronomers to estimate the distance to a galaxy if they can determine the galaxy's
velocity of recession.
Many things that we use today, such as automobiles, are made from iron. What was the original source of the iron mined from Earth?
blobs of liquid metal ejected from the Sun
the original Big Bang creation event.
the core of an exploding supernova.
mass lost from red giant stars.
Evidence that the Universe contains much unobserved dark matter is the
powerful radio emission from the centers of spirals.
excessive amounts of gas found in spiral galaxies.
flat rotation curves of spiral galaxies.
excessive amount of dark dust in spiral galaxies.
Which of the following is NOT one of Kepler's Three Laws?
the shapes of planetary orbits are ellipses.
the square of the period of a planet's orbit equals the cube of its semi-major axis.
planets sweep out equal areas in equal times.
objects of different masses fall at the same rate.
The age of a star cluster can be deduced from
the number of stars it contains.
its location in the Milky Way galaxy.
ts radial velocity.
the turn-off point of stars on its main sequence.
If the average density of the Universe were greater than the critical density, the Universe would
continue to contract forever.
continue to expand forever.
eventually stop expanding and then contract.
eventually stop contracting and begin expansion.
Hubble classified galaxies by their appearance. Which of the following types of galaxies do NOT fall on Hubble's tuning fork diagram?
Barred spiral galaxies.
The phases of the Moon are caused by
our differing viewing angle of the illuminated half of the Moon.
the Earth's shadow cast on the Moon as the Earth moves in between the Sun and the Moon.
the highly elliptical orbit of the Moon.
the rotation of the Earth.
Most of the helium in the Universe is believed to have been produced in
main sequence stars.
the Big Bang.
In about 5 billion years, the sun will become
a black hole.
a red giant.
a neutron star.
When neutron degeneracy fails in a high-mass star, it becomes a
What is the Chandrasekhar limit?
The distance from the center of a galaxy at which Population I stars turn to Population II stars.
The smallest mass a star can have and still burn hydrogen.
The size of a black hole.
The maximum possible mass of a white dwarf.
The measurements of radial motions of astronomical objects using the Doppler effect have been instrumental in
All of these answers.
discovering planets around other stars.
illustrating the need for dark matter in galaxies.
the discovery that our Universe is expanding.
The hypothesis that pulsars were spinning white dwarfs was excluded because
pulsars spin too fast.
white dwarfs emit X-rays.
pulsars always have red giant companions.
white dwarfs have broad absorption lines.
For main sequence stars, the general rule is: the higher the surface temperature, the
less luminous are the stars.
more common are binary stars.
more numerous are the stars.
greater the masses of the stars.
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There are 20 questions to complete.
General Science and Ability is also the compulsory part of CSS Exams. MCQs portion of GSA Paper carries 20 marks.
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