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Student Name: _________________________________
Mrs. Lee – 8th Grade Physical Science
Period #: ______
Page 1
Chapter 15 Practice Test – Answer Key
______ c
1) What is light?
a) electrical energy from the sun
c) energy that travels in the form of waves
b) matter that travels as waves
d) matter that allows us to see things
______ d
2) As the result of nuclear fusion, the sun gives off ______.
a) mechanical & electrical energy
b) chemical energy & sound
c) electrical energy & light
d) heat & light
______ a
3) How many stars are in our solar system?
a) one
b) hundreds
c) thousands
d) millions
______ d
4) The planets and moons in our solar system are visible because they ______.
a) emit their own light
b) undergo nuclear fusion
c) absorb light from the sun
d) reflect light from the sun
______ b
5) Patterns of stars in the sky are called ______.
a) galaxies
b) constellations
c) star systems
d) observatories
______ b
6) Which of the following is not part of the electromagnetic spectrum?
a) radio waves
b) sound waves
c) X-rays
d) infrared radiation
______ d
7) A neutron star that appears to produce pulses of radio waves is called a ______.
a) quasar
b) binary system
c) black hole d) pulsar
______ a
8) The earliest stage of a star’s “life” is called a ______.
a) protostar b) giant star c) quasar
d) white dwarf
______ a
9) The Hertzsprung-Russell diagram graphs stars’ ______.
a) absolute brightness & temperature
b) apparent brightness & absolute brightness
c) distance & absolute brightness
d) diameter & apparent brightness
______ b
10) How long a star “lives” depends on ______.
a) its color
b) its mass
c) whether it is single or binary
______ c
11) Parallax can’t be used on a star if the star is too ______.
a) close
b) bright
c) far away d) large
______ b
12) A light-year is a unit of ______.
a) time
b) distance
c) mass
Ch 15 Practice Test Answer Key
d) its temperature
d) absolute brightness
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Student Name: _________________________________
Mrs. Lee – 8th Grade Physical Science
Period #: ______
Page 2
Chapter 15 Practice Test – Answer Key
______ b
13) The distance between the crest of one wave of electromagnetic radiation and the
crest of the next one is its ______.
a) frequency b) wavelength
c) color
d) spectrum
______ a
14) When a star runs out of fuel, it cannot become a ______.
a) protostar b) neutron star
c) white dwarf
d) black hole
______ a
15) A star is born when nuclear fusion begins inside a protostar.
a) True
b) False
______ b (galaxy) 16) A quasar is a type of globular cluster.
a) True
b) False
______ a
17) A star system containing two stars is called a binary star.
a) True
b) False
______ b (apparent brightness)
18) A star’s absolute brightness is its brightness as seen from
Earth.
a) True
b) False
______ b (red or reddish)
a) True
19) The coolest stars are blue-white in color.
b) False
______ a
20) What is a building that has one or more telescopes?
a) observatory
b) radio telescope
c) planetesimal
______ b
21) What do astronomers use to measure distances to nearby stars?
a) galaxies
b) parallax
c) sound waves
______ c
22) The earliest stage in a star’s life is called a ______.
a) quasar
b) pulsar
c) protostar
______ b
23) What is a huge group of single stars, star systems, star clusters, dust, and gas?
a) nebula
b) galaxy
c) black hole
______ a
24) Young galaxies with giant black holes at their centers are ______.
a) quasars
b) pulsars
c) supernovas
______ c
25) According to Hubble’s law, the farther away a galaxy is, ______.
a) the slower it is moving away from Earth
b) the sooner it will stop moving
c) the faster it is moving away from Earth
Ch 15 Practice Test Answer Key
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Student Name: _________________________________
Mrs. Lee – 8th Grade Physical Science
Period #: ______
Page 3
Chapter 15 Practice Test – Answer Key
______ b
26) Astronomers think that in the future the universe will continue to ______.
a) shrink
b) expand
c) explode
______ b (refracting)27) A reflecting telescope focuses light through lenses.
a) True
b) False
______ a
28) A device used by astronomers to discover the elements found in stars is a
spectrograph.
a) True
b) False
______ b (black hole)
bang.
a) True
29) An object with gravity so strong that no light can escape is a big
b) False
______ a
30) Earth is in the Milky Way Galaxy
a) True
b) False
______ a
31) An elliptical galaxy looks like a round or flattened ball.
a) True
b) False
______ b (big bang) 32) The universe began with an explosion called the black hole.
a) True
b) False
______ a
33) The light you can see is called visible light.
a) True
b) False
______ b
34) A star’s absolute brightness is the star’s brightness as seen from Earth.
a) True
b) False
______ b
35) Spinning neutron stars are called supernovas.
a) True
b) False
______ a
36) The Milky Way is a spiral galaxy.
a) True
b) False
______ a
37) Astronomers think that most of the universe is made of dark energy and dark
matter.
a) True
b) False
Ch 15 Practice Test Answer Key
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Student Name: _________________________________
Mrs. Lee – 8th Grade Physical Science
Period #: ______
Page 4
Chapter 15 Practice Test – Answer Key
The diagram below is used by astronomers to classify stars. Use the diagram to answer the
following 5 questions:
______ a
38) Interpreting Graphs: What is the name for the kind of diagram shown in the
picture?
a) H-R diagram
b) universal diagram c) spectrograph
______ a
39) Interpreting Graphs: Which group of stars in the diagram has the greatest
absolute brightness?
a) group D
b) group B
c) group C
______ c
40) Interpreting Graphs: In which group of stars could a very bright red star or a
very bright yellow star be found?
a) group B
b) group C
c) group D
______ c
41) Applying Concepts: Which group of stars represents white dwarfs?
a) group A
b) group B
c) group C
______ b
42) Applying Concepts: In which group of stars would a main-sequence star be
found?
a) group A
b) group B
c) group C
Ch 15 Practice Test Answer Key
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