Deck 14: The Universe

Question 1

Which of the following star colors has the highest temperature?

A)blue
B)white
C)yellow
D)red

Answer 1

A

Question 2

The greater the apparent magnitude, the brighter the star.

Answer 2

False

Question 3

The core of a star is plasma with the density of solid lead.

Answer 3

True

Question 4

A light-year is a measure of astronomical distance.

Question 5

More massive stars tend to use up their supply of hydrogen more rapidly.

Question 6

When a massive star exhausts its supply of hydrogen fuel, it becomes a supernova.

Question 7

The location of the celestial meridian is determined by your location.

Question 8

Which type of star has the shortest life span?

A)large, very massive
B)small, not very massive
C)one on the main sequence
D)a star about the size of our Sun

Question 9

Nearby stars appear to move ____ relative to Polaris.

A)clockwise
B)counter-clockwise
C)straight by
D)in looping circles

Question 10

Stonehenge is an ancient observatory built in

A)ancient Babylon.
B)England.
C)the Euphrates river valley.
D)Greece.

Question 11

It is known that if there is sufficient dark matter in the universe, then the universe will eventually stop its expansion.

Question 12

A protostar is an accumulation of gases in outer space that will become a star.

Question 13

About how old is the universe?

A)6.0 billion years
B)10.5 billion years
C)13.7 billion years
D)20 billion years

Question 14

Where a main sequence star is located on the H-R diagram depends on its temperature and its

A)distance from Earth.
B)composition.
C)density of its core.
D)mass.

Question 15

Red giants are enormously bright because they are extremely hot.

Question 16

Earth rotates

A)from west to east.
B)from east to west.
C)at the same rate as it revolves around the Sun.
D)twice each day.

Question 17

Which of the following depends on your location on Earth?

A)celestial pole
B)celestial meridian
C)celestial equator
D)All of these depend on your location.

Question 18

The difference in brightness between two stars is related to the

A)amount of light and energy produced by the stars.
B)relative size of the stars.
C)distance to the stars.
D)All of the above.

Question 19

The absolute magnitude considers the brightness of a star when at a standard distance.

Question 20

Nuclear fusion reactions occur in what part of a star?

A)core
B)radiation zone
C)convection zone
D)All of the above.

Question 21

If the density of the universe is less than a critical value, then

A)it might eventually stop expanding.
B)it might continue expanding forever.
C)it could expand to a fixed size and remain.
D)there's probably less dark matter than luminous.

Question 22

The Milky Way galaxy is

A)spiral.
B)elliptical.
C)globular.
D)spherical.

Question 23

The expected life span of a star the size of the Sun is

A)10 billion years.
B)1 billion years.
C)100 million years.
D)10 million years.

Question 24

Compared to a star like the Sun, a blue-white star

A)is more massive.
B)has a higher surface temperature.
C)burns its fuel at a greater rate.
D)All of the above.

Question 25

Which of the following is evidence for the existence of "dark matter" in the universe?

A)The rate of expansion of the universe is speeding up.
B)Stars eventually use up their fuel and stop shining.
C)The outlying stars in a galaxy appear to rotate more rapidly than expected.
D)Either there is no proof that dark matter exists, or there is no way to calculate its abundance.

Question 26

In which part of a newborn star does the fusion reaction occur?

A)the core
B)the radiation zone
C)the convection zone
D)in all parts of the star

Question 27

Most of the stars plotted on a H-R diagram are

A)red giant stars.
B)white dwarf stars.
C)cepheid variables.
D)main sequence stars.

Question 28

Compared to magnitude 1 star, a star with a magnitude of 2 is

A)more than twice as bright.
B)less than half as bright.
C)ten times as bright.
D)less than one tenth as bright.

Question 29

How far Polaris appears above the horizon depends on

A)the time of night.
B)your longitude.
C)your latitude.
D)your position on the celestial meridian.

Question 30

The eventual fate of our Sun is to become

A)a neutron star.
B)a supernova.
C)a white dwarf.
D)a black hole.