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Stars Part 1 Test Review

Total questions: 56

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
Objects with a mass range between the heaviest planets and the lightest stars became known as ___
a)
red gnomes
b)
brown gnomes
c)
red dwarfs
d)
brown dwarfs
2.
Astronomers classify stars, using letters, based on their ___
a)
temperature
b)
size
c)
luminosity
d)
composition
3.
A new cooler class of star, discovered in 1988, was given the letter ___
a)
'O'
b)
'L'
c)
'F'
d)
'M'
4.
As brown dwarfs get more massive, they ___
a)
get smaller and denser
b)
get denser, but not bigger
c)
get larger and denser
d)
get bigger, but not denser
5.
Brown dwarfs, more than about 13 times Jupiter's mass,  can fuse both lithium and ___
a)
deuterium
b)
tritium
c)
beryllium
d)
boron
6.
Deuterium is an atom that's very similar to hydrogen except it has ___
a)
a proton and a neutron in its nucleus
b)
two neutrons in its nucleus
c)
two protons in its nucleus
d)
two orbiting electrons
7.
Brown dwarfs are not considered true stars because they don't fuse ___
a)
hydrogen
b)
silicon
c)
lithium
d)
beryllium
8.
What is red shift?
a)
When a star collapses.
b)
Galaxies and stars are moving away from us. 
c)
A very luminous burst of radiation
d)
When the sun collapses.
9.

Choose all that apply. A star's spectra tells us what about a star.

a)

composition of that star (what elements make up that star)

b)

movement of a star (red shift or blue shift)

c)

brightness of a star

d)

temperatures of a star

10.
Use the image to identify the motion of the object relative to Earth.  Compare the absorption spectra of the star to what the star would look like if it were not moving at all relative to Earth.
a)
It is not moving
b)
It is moving away from Earth (Redshift)
c)
It is moving towards Earth (Blueshift)
d)
It is moving towards Earth (Redshift)
11.
What happens to the electrons of an atom when they get energized?
a)
They move to lower energy levels
b)
They move permanently to higher energy levels 
c)
They move temporarily to higher energy levels
d)
They fly off the atom completely
12.

When analyzing star light or elements in a lab, what are the different color patterns produced by the prism called?

a)

emission spectra

b)

the rainbow

c)

absorption spectra

d)

spectral rainbow

13.

The width of spectral lines can tell us about stars (choose all that apply)

a)

Composition

b)

Temperature

c)

Size

d)

Rotational veolocity

14.

The brightness of a star as seen from earth

a)

Apparent magnitude

b)

Awesome magnitude

c)

Absolute magnitude

d)

Amazing magnitude

15.

Why can the apparent magnitude be inaccurate?

a)

It doesn't exist

b)

It may not be brighter compared to another star but instead just closer

c)

It only shows the brightness of stars too far away for humans to detect

d)

the scale is messed up

16.

Brightness determined by DISTANCE from the earth

a)

Amazing magnitude

b)

Absolute magnitude

c)

Apparent magnitude

d)

Awesome magnitude

17.

In comparison to other stars in the sky, the Sun appears brighter because it is–

a)

Bigger

b)

Smaller

c)

Nearer

d)

Further

18.
Characteristics used to classify stars include
a)
distance, size, and color.
b)
size, distance, and brightness.
c)
color, brightness, and distance.
d)
size, brightness, and temperature.
19.
The absolute brightness of a star depends on its
a)
distance and temperature.
b)
size and temperature.
c)
color and temperature.
d)
distance and color.
20.
What color of star is the hottest?
a)
Blue
b)
Red
c)
Yellow
d)
Orange
21.
The color of a star depends on its
a)
size
b)
temperature
c)
shape
d)
magnitude
22.
Put the stars in order from coolest to hottest.
a)
Blue, White, Yellow, Orange, Red
b)
Red, Orange, Yellow, White, Blue
c)
Red, Orange, Yellow, Blue, White
d)
Red, Yellow, Orange, White, Blue
23.
Which of the following would be the dimmest star? 
a)
-15
b)
-5
c)
0
d)
25
24.
Which of the following stars would be seen as the brightest star?
a)
Alpheratz, which has an apparent magnitude of 2
b)
Alcyone, which has an apparent magnitude of 3
c)
Deneb, which has an apparent magnitude of 1
d)
Sirius, which has an apparent magnitude of -1
25.
Which is the hottest?
a)
a red giant
b)
small, white dwarf
c)
main-sequence yellow star
d)
main-sequence blue star
26.

Order the stars from brightest to dimmest based on ABSOLUTE brightness.

a)

A, B C, D

b)

D, C, B, A

c)

D, C, A, B

d)

A, D, C, B

27.

M = m + 5 – 5 log d

If the apparent magnitude of a star is 10, and its distance in parsecs is 100, what is its absolute magnitude?

a)

5

b)

10

c)

15

d)

-35

28.

M = m + 5 – 5 log d

The star Hadar has an absolute magnitude of -4.4 and an apparent magnitude of 0.6. How far away is it in parsecs?

a)

1

b)

10

c)

100

d)

1000

29.

The luminosity of the Sun, 𝐿𝐿⨀, is 3.828∗1026W. Polaris has a mass of 7.5𝑀𝑀⨀and a diameter 30 times that of the Sun. The difference between their absolute magnitudes is 8.47. What is the surface temperature on Polaris?

a)

7600K

b)

7400K

c)

7200K

d)

7000K

e)

6800K

30.

Which pair is most likely to have stars with approximately equal radii?

a)

A

b)

B

c)

C

d)

D

e)

It is impossible to compare stellar radii using a H–R diagram.

31.

Which of the following give off infrared radiation?

a)

people

b)

light bulbs

c)

stars

d)

a heated / glowing stovetop burner

32.

Shows the relationship between luminosity and temperature in a star.

a)

HR (Hertzsprung - Russell) Diagram

b)

Color vs. Brightness chart

c)

Temperature vs. Luminosity chart

d)

Stellar life cycle chart

33.
Main Sequence
a)
Binary Star
b)
Parsec
c)
the brightness that a star would have at a distance of 32.6 light-years from Earth
d)
the location on the H-R diagram where most stars lie
34.
Binary Star
a)
the location on the H-R diagram where most stars lie
b)
A group of stars that form a pattern in the sky
c)
one of two stars revolving around a common center of mass under their mutual gravitational attraction
d)
Constellation
35.
Parsec
a)
the brightness of a star as seen from Earth have at a distance of 32.6 light-years from Earth Luminosity The actual brightness of a star
b)
A unit of distance that is equal to 3.26 light years
c)
the brightness that a star would have at a distance of 32.6 light-years from Earth
d)
The actual brightness of a star
36.

____ binaries orbit far enough from each other that they can be viewed individually.

a)

Spectroscopic

b)

Independent

c)

Visual

d)

Parallax

37.

The image shows a light curve for what type of binary star sytem?

a)

Spectroscopic

b)

Eclipsing

c)

Visual

d)

Double

e)

Astrometric

38.

The image shows Albireo (Beta Cyg), a double star system. It is not known if these stars are part of a binary system.

a)

These stars are orbiting each other

b)

These stars may or may not be orbiting each other

c)

These stars are not orbiting each other

39.

This image shows Mizar and Alcor. A clear example of

a)

A Visual Binary

b)

A Spectroscopic Binary

c)

Two Unrelated Stars

40.

For a star system to be an Eclipsing Binary, we must be seeing the stars

a)

"Edge On"

b)

"Top Down"

c)

From the left

d)

individually rendered

41.

Which type of Binary Star system is most useful for determining the masses and radii of the stars?

a)

Spectroscopic Binary

b)

Astrometric Binary

c)

Eclipsing Binary

d)

Double Star System

42.

It is possible for a star system to be both a spectroscopic binary AND an eclipsing binary

a)

True

b)

False

c)

True, but the odds are infintessimal

43.

A star moving toward us will show spectral lines that are ______ due to the doppler effect

a)

thicker

b)

brighter

c)

blueshifted

d)

redshifted

44.

Determine the mass, in solar masses, of an eclipsing binary system with a semimajor axis of 6 AU and an orbital period of 3 years.

a)

7

b)

9

c)

18

d)

4

45.

Parallax is used to determine a star’s

a)

distance from Earth.

b)

temperature.

c)

composition.

d)

brightness.

46.

The average distance from the Earth to the Sun is called this:

a)

Light Minute

b)

Astronomical Unit

c)

Parsec

d)

Arcminute

47.

A "parsec" (pc) is short for

a)

partial seconds in light years.

b)

parallax in continuity.

c)

a unit of time

d)

parallax in arc seconds.

48.

With greater distance, the parallax angle

a)

increases

b)

decreases

c)

stays the same

49.

The nearest star system to our Sun is

a)

Proxima Centauri

b)

Cygni

c)

Beta Centauri.

d)

Algol

50.

What is the period shown on this light curve graph for this variable star?

a)

.5 days

b)

1.0 days

c)

1.5 days

d)

2.0 days

51.

If a type 1 cepheid variable has a period of 12 days, what is a likely absolute magnitude?

a)

-1

b)

-2

c)

-3

d)

-4

52.

If you were comparing two cepheid variables, star Y with a period of 7 days and star Z with a period of 28 days, which would have a brighter absolute magnitude?

a)

Star Y

b)

Star Z

c)

Equal since they are both Cepheid variables

53.

What method allows for the farthest stellar distances to be known?

a)

Parallax

b)

RR Lyrae Variables

c)

Cepheid Variables

d)

RADAR

54.

What is the distance of a star with a parallax angle of 0.75 arcsec?

a)

3.35 pc

b)

2.4 ly

c)

1.33 pc

d)

4.35 ly

55.

You should be comfortable solving for any variable in the Stefan-Boltzmann Law.

a)

Okay.

b)

Roger that.

c)

What's that?

d)

Oof.

56.

What is the brightness ratio of two stars with apparent magnitudes of -0.7 and 1.8?

a)

0.1

b)

1

c)

10

d)

100

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