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Home arrow Chapter 24 arrow Chapter Test

Chapter Test

Read the questions carefully and choose the best answer.

This activity contains 31 questions.

Question 1.
Absolute magnitude is the brightness of a star when viewed from Earth.

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Question 2.
The light-year is a unit used to measure the age of a star.

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Question 3.
The difference between a star's apparent and absolute magnitudes is related to


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Question 4.
Compared to a magnitude 6 star, a magnitude 5 star is about


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Question 5.
On an H-R diagram, about 90 percent of the stars are


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Question 6.
Stars that orbit one another are called neutron stars.

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Question 7.
Stars with equal surface temperatures radiate the same amount of energy per unit area.

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Question 8.
The two properties of a star that are plotted on an H-R diagram are


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Question 9.
A star with a surface temperature less than 3000 K will generally appear red.

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Question 10.
Dark nebulae appear dark because they


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Question 11.
Emission nebulae emit or give off


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Question 12.
Nebulae are dense accumulations of star clusters.

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Question 13.
The Horsehead Nebula in Orion is best described as a


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Question 14.
Hot stars are sometimes embedded in gaseous masses that consist mostly of


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Question 15.
Which force is most responsible for the formation of a star?

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Question 16.
A stable main-sequence star is balanced between the force of gravity and gas pressure.

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Question 17.
All stars eventually exhaust their nuclear fuel and collapse in response to gravity.

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Question 18.
The outer envelope of material ejected from a red giant as it collapses to a white dwarf is called a

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Question 19.
Large-mass stars evolve to become white dwarfs.

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Question 20.
Stars exceeding three solar masses have relatively short life spans and terminate in a brilliant explosion called a supernova.

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Question 21.
Identify and correctly label the idealized structure of the given galaxy.

(Galaxy diagram, Copyright © Prentice Hall, Inc.)

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The letters A through E appear on an image associated with this question.

This question presents 5 items numbered 21.1 through 21.5. Each item is presented with a pulldown menu containing the letters A through E. For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
[hint]
[hint]
[hint]
[hint]
[hint]
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Question 22.
Elliptical galaxies contain most of the youngest stars.

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Question 23.
Most of the known galaxies are classified as


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Question 24.
The Local Group contains all the spiral galaxies.

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Question 25.
In the early 1700s, Hubble provided evidence that the fuzzy patches of light among the stars were actually distant galaxies.

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Question 26.
The Milky Way Galaxy appears to be densely surrounded by stars because our solar system is located within the flat galactic disk.

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Question 27.
The best evidence for an expanding universe is


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Question 28.
Hubble's law states that galaxies are receding from us at a speed proportional to their


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Question 29.
The inception, or start, of our universe is best explained by the


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Question 30.
Current estimates indicate the average density of our universe is below the critical density.

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Question 31.
Hubble proposed the Big Bang theory to explain the inception of the universe.

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