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Astronomy Unit Review
Test Description: Astronomy review
Instructions: Answer all questions to get your test result.
1) One complete revolution of the Earth around the sun takes about
A
one year
B
one eclipse
C
one totation
D
one season
2) Earth has seasons because
A
the temperature of the sun changes.
B
the distance between Earth and the sun changes.
C
it rotates on its axis
D
its axis is tilted as it moves around the sun.
3) In the Southern Hemisphere, the summer solstice occurs when the sun is
A
closest to Earth.
B
farthest north.
C
farthest south.
D
at the equator.
4) All objects are attracted to each other by the force of
A
gravity.
B
inertia.
C
weight.
D
mass.
5) The strength of the force of gravity depends on
A
the masses of the objects and their weights.
B
the weight of the objects and their speeds.
C
the masses of the objects and the distance between them.
D
the masses of the objects and their speeds.
6) What layer are you looking at when you look at an image of the sun?
A
chromosphere
B
prominence
C
corona
D
photosphere
7) The solar wind is a stream of electrically charged particles that extend outward from the sun's
A
photosphere
B
chromosphere
C
corona
D
core
8) What do the four outer planets have in common?
A
They are about the same size as Earth and are made mainly of iron.
B
They are about the same size as Earth and are made mainly of hydrogen and helium.
C
They are much larger than Earth and are make mainly of iron.
D
They are much larger than Earth and are made mainly of hydrogen and helium.
9) What do all of the inner planets have in common?
A
They all are small and have rocky surfaces.
B
They all have abundant liquid water.
C
They all have rings.
D
They all have many moons.
10) A light-year is
A
the distance light travels on one year.
B
the distance between Earth and Proxima Centauri.
C
365 days.
D
the amount of light the sun produces in a year.
11) A pattern or grouping of stars imagined by people to represent a figure is a
A
mythological object
B
seasonal pattern
C
constellation
D
star chart
12) The sun produces energy by
A
nuclear fission
B
burning fuels such as oil.
C
attracting it with the force of gravity.
D
nuclear fusion
13) Characteristics used to classify stars
A
size, brightness and temperature
B
distance, size and color
C
size, distance and brightness
D
color, brightness, and distance
14) The Hertzsprung-Russell diagram shows that main-sequence stars
A
are mostly hot and dim.
B
increase in brightness as they increase in temperature.
C
are mostly cool and bright.
D
decrease in brightness as they increase in temperature.
15) A star is born when
A
helium and oxygen combine.
B
a protostar begins to cool.
C
a nebula expands.
D
nuclear fusion starts.
16) Which of the following is a major difference between elliptical galaxies and spiral galaxies?
A
Spiral galaxies contain only old stars.
B
Elliptical galaxies have almost no gas or dust between the stars.
C
Spiral galaxies have almost no gas or dust between the stars.
D
Elliptical galaxies vary more in shape than spiral galaxies.
17) Eclipsing binary stars can sometimes be identified because
A
they are all white dwarfs.
B
they are brighter than any single star.
C
they are cool red stars.
D
they become dimmer at regular intervals.
18) From the cosmic background radiation, scientists can infer that, just after the big bang, the universe must have been
A
the same average temperature as it is today.
B
cooler than it is today.
C
very small.
D
hot.
19) According to Hubble's law, the farther away a galaxy is,
A
the slower it is moving towards us.
B
the faster it is moving toward us.
C
the faster it is moving away from us.
D
the slower it is moving away from us.
*select an answer for all questions
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