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IPC 8D: Radioactivity and Nuclear Reactions

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
The type of radioactive particle that can be stopped by a sheet of paper is the ____.
a.
alpha particle
c.
gamma ray
b.
beta particle
d.
uranium
 

 2. 
A helium nucleus with two protons and two neutrons is called a(n) ____.
a.
alpha particle
c.
electroscope
b.
beta particle
d.
gamma ray
 

 3. 
When the strong force is not sufficient to hold unstable nuclei together permanently, ____.
a.
nuclear fusion occurs
c.
the nuclei decay
b.
a solid becomes a liquid
d.
carbon-12 changes into carbon-14
 

 4. 
The process by which nuclei having low masses are united to form nuclei with larger masses is ____.
a.
a chain reaction
c.
nuclear fission
b.
a chemical reaction
d.
nuclear fusion
 

 5. 
The three types of nuclear radiation in increasing order of penetrating power are ____.
a.
alpha, beta, gamma
c.
X ray, beta, gamma
b.
alpha, gamma, beta
d.
X ray, gamma, beta
 

 6. 
The stability of an isotope nucleus depends on the ____.
a.
atomic mass
c.
number of neutrons
b.
atomic number
d.
neutron-to-proton ratio
 

 7. 
Both a fusion reaction and a fission reaction ____.
a.
causes chain reactions
c.
take place at room temperature
b.
produce energy
d.
use hydrogen as a fuel
 

 8. 
For which of the following problems would a scientist most likely use carbon-14?
a.
to calculate the age of the Earth's oldest rocks
b.
to calculate the age of a piece of bone
c.
to identify the elements that make up a rock
d.
to identify the elements that make up a bone
 

 9. 
Thorium-234 has a half-life of 24 days. If you started with a 100-g sample of thorium-234, how much would remain after 48 days?
a.
100 g
c.
25 g
b.
50 g
d.
10 g
 

 10. 
When the ____ is not large enough to hold a nucleus together tightly, the nucleus can become radioactive.
a.
electric force
c.
tracer
b.
strong force
d.
isotope
 



 
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