Science

A. radioactive implosion
B. Nuclear Fission

C. nuclear fusion
D. combustion


ANSWER: B
Nuclear fusion is the process by which two or more
nuclei with small masses (such as hydrogen) join
together, or fuse, to form a larger, more massive
nucleus (such as helium). During this process, a
massive amount of energy and radioactive emissions
(such as gamma rays) are produced. Combustion, and
even nuclear fission, would consume too much
matter, causing a star to die much too quickly.

A. a globular cluster

B. A retrograde pattern

C. A constellation

D. A nebula


Answer: C
Constellations helped astronomers in the
science’s early history to organize the sky
and track the apparent motions of planets
and stars. Commonly recognized
constellations include the Big Dipper, the
Little Dipper, Ursa Major, and so forth.

A. From the planets in a solar system

B. In comets

C. In asteroids

D. In nebulae


Answer: D
A nebula is a large cloud of gas and dust
spread out in an immense volume. Stars are
formed from the gas and dust of a nebula.

A. Gravitation

B. Friction

C. Magnetism

D. Electromagnetic energy


Answer: B
The core is at the center of the sun. This is
where the sun’s energy is produced through
the process of nuclear fusion of hydrogen
atoms.

A. A galaxy

B. A quasar

C. A pulsar

D. A nebula


Answer: A
A galaxy is a huge grouping of individual
stars, star systems, star clusters, dust, and
gas all bound together by gravity. There are
billions of galaxies in the universe, each
containing billions or even trillions of stars.

A. Irregular galaxy

B. Spiral galaxy

C. Elliptical galaxy

D. Spherical galaxy


Answer: B
Galaxies that appear to have a bulge in the
middle and arms that spiral outward are
known as spiral galaxies. Most galaxies,
including the Milky Way are spiral galaxies.

A. A theory that states that the universe began with a
tremendous explosion.

B. A theory that states that particles in the universe
are constantly imploding.

C. A theory that states that the universe has no
beginning and no end.

D. A theory that states that the universe is currently
nothing more than a small ball of matter.


Answer: A
Astronomers theorize that the universe was
first formed 10 to 15 billion years ago. At
that time, all of the matter in the universe
was melded together into an incredibly dense
ball that was no more than a millimeter or so
in diameter. The ball then exploded in what is
known as the big bang.

A. Fossil correlation

B. Radiometric analysis

C. Absolute dating

D. Rock ordering


Answer: A
Fossil correlation is used to reconstruct the
history of life on Earth. Although the rock
types vary from outcrop to outcrop, the
sedimentary rock layers contain fossils, called
index fossils, that mark a specific “moment”
in geologic history. Index fossils are used to
correlate the fossils in one area with fossils in
another area.

A. Fungi

B. Archaebacteria

C. Protista

D. Eubacteria


Answer: C
Today, eukaryotes are single- or multi-celled
organisms, but the first eukaryotes were only
single-celled. They were differentiated from
prokaryotes by their nucleus. These nucleusbearing, single-celled organisms were the
ancestors of modern-day protists (as well as
all other forms of eukaryotic life).

A. The development of the nucleus

B. Endosymbiosis

C. Cell differentiation

D. The evolution of organelles


Answer: C
A unicellular organism must carry out all of
the activities of the organism within the
structures of a single cell. Distinct types of
cells in one body can have specialized
functions in a multicellular organism.
Therefore, the development of the ability of a
cell to become differentiated led to the
evolution of multicellular life forms.

A. Potassium-argon method

B. Uranium-lead method

C. There is no radiometric dating method
available for an object of that age.

D. Carbon-14 method


Answer: D
The half-life of uranium-238 is 4.5 billion
years. The half-life of potassium-40 is 1.3
billion years. The half life of carbon-14 is
5,730 years. Therefore, the carbon-14
method would be adequate to date an object
that was around 20,000 years old.

A. Wind

B. Sunlight

C. Silver

D. Trees


Answer: C
There is only a limited amount of silver on
Earth. Once all the silver has been used up,
no more can be made. Resources such as
trees, however, can be planted and grown to
replace the ones we use, and resources such
as sunlight and wind are extremely abundant
and will constantly be renewed as long as our
solar system’s sun burns.

A. Millions of years

B. Billions of years

C. Hundreds of years

D. Thousands of years


Answer: B
It takes millions of years for fossil fuels to
form. As a matter of fact, the majority of the
fossil fuels we use today were formed around
300 million years ago.

A. Petroleum

B. Iron ore

C. Fresh water

D. Diamonds


Answer: C
Some communities have a hard time
providing enough fresh water for everybody,
but because fresh water is constantly recycled
in the environment through the water cycle,
freshwater can still be considered a
renewable resource. The other resources
listed will someday run out if we keep using
them, so we must learn to “conserve,” or limit
our use.