Exercise General Science Quiz

General Science & Ability Exercise – 3 | CSS Times Online Test Series

General Science & Ability Exercise - 3 | CSS Times Online Test Series
Shahzad F. Malik
Written by Shahzad F. Malik

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General Science and Ability | Exercise 3

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Question 1
What prevents a white dwarf from collapsing to a black hole?
A
Fission of complex elements releases heat
B
The highly compressed electrons exert degeneracy pressure.
C
Fusion of complex elements generates heat
D
The highly compressed neutrons exert degeneracy pressure.
Question 2
In order from the hottest to the coolest stars, the order of the stellar spectral sequence is
A
OBFGAMK
B
MKGFABO
C
OBAFGKM
D
ABFGKMO
Question 3
Modern cosmology supposes that the Universe came from a "big bang" event about 13 billion years ago. Evidence for this is
A
the Hubble expansion
B
the uniformity of the abundance of hydrogen and helium
C
the cosmic background radiation
D
all of these answers.
Question 4
The proton proton chain
A
produces chains of protons which are then broken apart to produce the Sun's energy.
B
adds protons together until a massive carbon nucleus is produced at the core of the Sun.
C
is the runaway reaction that produces the fission of iron during a supernova explosion.
D
is a three step process which converts some mass to energy as helium nuclei are formed.
Question 5
Even if a "wormhole" could be constructed for interstellar travel, it would be dangerous to use because
A
Worms are unpleasant.
B
There would be no way back from the other side.
C
Tidal forces would crush ships entering it.
D
Objects might spontaneously fly out of it.
Question 6
Hubble's Law enables astronomers to estimate the distance to a galaxy if they can determine the galaxy's
A
mass
B
velocity of recession.
C
temperature
D
spectral type.
Question 7
Many things that we use today, such as automobiles, are made from iron. What was the original source of the iron mined from Earth?
A
blobs of liquid metal ejected from the Sun
B
mass lost from red giant stars.
C
the core of an exploding supernova.
D
the original Big Bang creation event.
Question 8
Evidence that the Universe contains much unobserved dark matter is the
A
flat rotation curves of spiral galaxies.
B
powerful radio emission from the centers of spirals.
C
excessive amount of dark dust in spiral galaxies.
D
excessive amounts of gas found in spiral galaxies.
Question 9
Which of the following is NOT one of Kepler's Three Laws?
A
planets sweep out equal areas in equal times.
B
the square of the period of a planet's orbit equals the cube of its semi-major axis.
C
the shapes of planetary orbits are ellipses.
D
objects of different masses fall at the same rate.
Question 10
The age of a star cluster can be deduced from
A
its location in the Milky Way galaxy.
B
the turn-off point of stars on its main sequence.
C
ts radial velocity.
D
the number of stars it contains.
Question 11
If the average density of the Universe were greater than the critical density, the Universe would
A
eventually stop contracting and begin expansion.
B
continue to expand forever.
C
eventually stop expanding and then contract.
D
continue to contract forever.
Question 12
Hubble classified galaxies by their appearance. Which of the following types of galaxies do NOT fall on Hubble's tuning fork diagram?
A
Elliptical galaxies.
B
Spiral galaxies.
C
Barred spiral galaxies.
D
Peculiar galaxies.
Question 13
The phases of the Moon are caused by
A
the Earth's shadow cast on the Moon as the Earth moves in between the Sun and the Moon.
B
the rotation of the Earth.
C
the highly elliptical orbit of the Moon.
D
our differing viewing angle of the illuminated half of the Moon.
Question 14
Most of the helium in the Universe is believed to have been produced in
A
main sequence stars.
B
red giants.
C
the Big Bang.
D
supernovae.
Question 15
In about 5 billion years, the sun will become
A
a supernova.
B
a neutron star.
C
a red giant.
D
a black hole.
Question 16
When neutron degeneracy fails in a high-mass star, it becomes a
A
pulsar
B
white dwarf.
C
neutron star.
D
black hole.
Question 17
What is the Chandrasekhar limit?
A
The size of a black hole.
B
The smallest mass a star can have and still burn hydrogen.
C
The maximum possible mass of a white dwarf.
D
The distance from the center of a galaxy at which Population I stars turn to Population II stars.
Question 18
The measurements of radial motions of astronomical objects using the Doppler effect have been instrumental in
A
All of these answers.
B
discovering planets around other stars.
C
illustrating the need for dark matter in galaxies.
D
the discovery that our Universe is expanding.
Question 19
The hypothesis that pulsars were spinning white dwarfs was excluded because
A
pulsars spin too fast.
B
white dwarfs have broad absorption lines.
C
white dwarfs emit X-rays.
D
pulsars always have red giant companions.
Question 20
For main sequence stars, the general rule is: the higher the surface temperature, the
A
more numerous are the stars.
B
less luminous are the stars.
C
greater the masses of the stars.
D
more common are binary stars.
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General Science and Ability is also the compulsory part of CSS Exams. MCQs  portion of GSA Paper carries 20 marks.

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Shahzad F. Malik

Shahzad F. Malik

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