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Astronomy Unit Review
Test Description: Astronomy
Instructions: Answer all questions to get your test result.
1) Day and night are caused by
A
Earth's rotation on its axis
B
Earth's revolution around the sun
C
eclipses
D
the tilt of the Earth's axis
2) What is the name for a pattern or group of stars that people imagined represents a fugure?
A
meteor
B
galaxy
C
constellation
D
planet
3) A streak of light made by a chunk of rock or dust entering Earth's atmosphere is called a(n)
A
meteor
B
meteoroid
C
asteroid
D
meteorite
4) Earth has four seasons. What interaction is responsible for the seasons?
A
the tilt of the Earth
B
the suns rotation and the solar wind
C
changes in the distance from the sun
D
the sun's gravity and sunspots
5) What causes a solar eclipse?
A
Earth blocks sunlight from reaching the moon.
B
One side of Earth blocks the sunlight from reaching the other side of the Earth.
C
The sun blocks moon beams from reaching the Earth.
D
The moon blocks sunlight from reaching Earth.
6) Why do temperature on the moon's surface vary more than temperatures on Earth's surface?
A
The moon has a lower density than the Earth.
B
The moon has pathces of ice.
C
The moon has no atmosphere.
D
The moon's surface has many craters.
7) Many early observers believed that the sun and stars orbited Earth. What is the name of this model?
A
heliocentric model
B
geocentric model
C
galaxy model
D
lunar model
8) The solar system consists of the sun, several kinds of smaller objects such as comets and asteroids, and
A
the star proxima centauri
B
eight planets and their moons
C
six planets and their moons
D
more than 100 planets
9) Which planet is sometimes called Earth's twin because it has similar density and internal structure?
A
venus
B
mercury
C
saturn
D
mars
10) Which of the following could a stars become after it runs out of fuel?
A
galaxy
B
comet
C
moon
D
white dwarf
11) The solar system began as a cloud of gas and dust called a solar nebula. What force formed the sun, planets, and other objects from this nebula?
A
magnetism
B
gravity
C
centrifugal force
D
friction
12) The atmospheres of the gas giant planets cannot escape into space because
A
The gases are too heavy.
B
the gases solidify at higher elevations.
C
the planets have very strong gravitational pulls.
D
although they are big, the planets have little mass.
13) The milky Way is an example of
A
an elliptical galaxy
B
an irregular galaxy
C
a quasar
D
a spiral galaxy
14) What two key factors led Galileo Galilei to convince others that the heliocentri model was correct.
A
Moons orbiting Jupiter and phases of Venus
B
Phases of the moon and seasons of the sun
C
circular ellipses and phases of Jupier
D
Planets revolving around Earth and elliptial orbits.
15) Earth is closest to the sun when it is summer in the
A
Eastern Hemisphere
B
Northern Hemisphere
C
Western Hemisphere
D
Southern Hemisphere
16) In June there a fewer hours of daylight and less direct sunlight in the
A
Eastern Hemisphere
B
Western Hemisphere
C
Northern Hemisphere
D
Southern Hemisphere
17) How do scientists use parallex to measure the distance o nearby stars?
A
Parallax helps classify stars according to brightness and temperature.
B
Parallax helps identify the chemical composition of stars
C
The Parallax increases the focal length of the lens of a telescope.
D
Parallax shows the apparent movement of a star seen from different positions.
18) How an you tell the temperature of a star's surface?
A
by the size
B
by the speed it travels
C
by the brightness
D
by the color
19) Most stars on the H-R diagram are
A
main-sequence stars
B
supergiants
C
white-dwarfs
D
giants
20) All stars begin their lives as part of
A
double stars
B
protostars
C
pulsars
D
nebulas
*select an answer for all questions
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