NEW
Font size
S
M
L
XL
WorksheetsStellar Fusion
Total questions: 25
Worksheet time: 46mins
Name
Class
Date
1.
2 small nuclei combine into a larger nucleus
a)
fission
b)
fusion
c)
radiation
d)
allusion
2.
Which atoms combine together during fusion reactions in the sun?
a)
Helium and Hydrogen atoms
b)
Hydrogen atoms
c)
Hydrogen and Lithium atoms
d)
Hydrogen and Carbon atoms
3.
Where does fusion occur naturally?
a)
Underwater
b)
All around us
c)
In the radioactive waste
d)
In the sun
4.
What is this process?
a)
Fission
b)
Fusion
c)
Combustion
d)
Oxidation
5.
When stars are fusing hydrogen into helium, and are neither growing nor collapsing, they are said to be...
a)
dying but balanced
b)
balanced/ in equilibrium
c)
white dwarfs
d)
red giants
6.
What are the primary products of fusion in stars?
a)
Helium
b)
Energy
c)
Hydrogen
d)
Both Helium and Energy
7.
In fusion, smaller atoms are forced together to create larger atoms. Does this process release, absorb or maintain energy?
a)
Absorb energy
b)
Maintain energy
c)
Release energy
d)
There is no energy
8.
Hydrogen is the primary fuel for what?
a)
Fission
b)
Fusion
c)
Radioactive Decay
d)
Bombs
9.
How can we tell fusion and gravity are balanced for this main sequence star?
a)
Bigger fusion arrows
b)
Smaller fusion arrows
c)
Equal fusion and gravity arrows
d)
They aren't balanced
10.
The stage being modeled here is called what?
a)
red giant
b)
main sequence
c)
white dwarf
d)
supernova
11.
Which is a similarity between low and high mass stars?
a)
planetary nebula
b)
hydrogen fusion
c)
supernova
d)
white dwarf
12.
In which stage does any star reach a balance between the force of gravity and fusion for the first time?
a)
nebula
b)
protostar
c)
main sequence
d)
black dwarf
13.
When does a protostar become a star?
a)
The core of the protostar stops gaining mass
b)
All of the gas and dust in nebula collect
c)
Hydrogen begins fusing into helium
d)
The core of the protostar collapses
14.
What does it mean that fusion is a "chain reaction?"
a)
many steps or mini-reactions in the process
b)
long chains of elements form in a row
15.
How does the sun produce energy?
a)
Fission
b)
Burning gas
c)
Fusion
d)
Absorbing heat from space
16.
Which force pushes the layers of the star outward?
a)
heat from fusion
b)
gravity
17.
Which force pulls the star inward to form a ball?
a)
heat from fusion
b)
gravity
18.
A star begins to "die" when elements stop fusing in its core.
a)
True
b)
False
19.
A star that expands and cools once it runs out of hydrogen fuel and moves on to fusing heavier elements.
a)
neutron star
b)
black hole
c)
red giant
d)
supernova
20.
Do all stars make energy through fusion?
a)
Yes
b)
No
c)
Just our sun
d)
Only large stars
21.
How is fusion different than other chemical reactions?
a)
atoms work together
b)
atoms merge to share a nucleus
c)
there is no difference
d)
atoms move independently but function together
22.
In the red giant stage, how would you describe the struggle between fusion and gravity?
a)
fusion is winning
b)
gravity is winning
c)
they are balanced
d)
they are explosive
23.
In the main sequence stage, how would you describe the struggle between fusion and gravity?
a)
fusion is winning
b)
gravity is winning
c)
they are balanced
d)
there is no fusion or gravity
24.
As a star collapses into a black hole, how would you describe the struggle between fusion and gravity?
a)
fusion is winning
b)
gravity is winning
c)
they are balanced
d)
fusion is beginning
25.
Why do scientists most want to learn more about fusion?
a)
To win the Nobel prize
b)
To make energy for people to use
c)
To destroy the world
d)
To know more about stars
Reset
