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Multiple Choice Quiz
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1

The nuclear bomb dropped on Hiroshima involved __ of the nuclei of uranium atoms.
A)fission
B)fusion
C)synthesizing
D)decomposition
2

We encounter radiation and radioactivity __.
A)very rarely
B)occasionally
C)daily
D)only near nuclear power plants
3

All atoms contain neutrons except an isotope of __.
A)carbon
B)beryllium
C)helium
D)hydrogen
4

How many neutrons are in an atom of uranium which has a mass of 238amu?
A)143
B)138
C)119
D)146
5

What is the mass number of an atom of cobalt which has 32 neutrons?
A)45
B)54
C)58
D)59
6

An alpha particle is composed of
A)1 proton and 1 neutron.
B)2 protons and 2 neutrons.
C)1 proton and 2 neutrons.
D)2 protons and 1 neutron.
7

An alpha particle is the same as a(n) __ nucleus.
A)H
B)He
C)Li
D)Be
8

When a radioactive atom emits an alpha particle, the original atom's mass __.
A)remains the same
B)increases by 2 amu
C)decreases by 2 amu
D)decreases by 4 amu
9

A beta is a(an)__ ejected from the nucleus.
A)proton
B)positron
C)electron
D)neutron
10

A neutron can change into __ under some circumstances.
A)positron and an electron
B)proton and an electron
C)proton and a positron
D)2 electrons
11

When radioactive radon-222 emits an alpha particle, the remaining atom left behind is __.
A)bismuth
B)lead
C)polonium
D)astatine
12

When bismuth emits a beta particle, the remaining atom is __.
A)gold
B)polonium
C)lead
D)thallium
13

Alpha emission __.
A)is an energy burst only
B)lowers the proton and neutron count by 2
C)raises the proton count by 1
D)lowers the proton count by 1
14

Gamma ray emission __.
A)is an energy burst only
B)lowers the proton and neutron count by 2
C)raises the proton count by 1
D)lowers the proton count by 1
15

Carbon-14 is produced naturally in the atmosphere by the bombardment of nitrogen-14 by neutrons from cosmic radiation with the release of a __.
A)positron
B)proton
C)electron
D)alpha particle
16

Fission releases a large amount of energy because significant amounts of __ are converted to energy during such nuclear reactions.
A)gamma rays
B)beta particles
C)matter
D)alpha
17

The fuel source in a conventional nuclear reactor is __.
A)Pu-239
B)Pu-242
C)U-235
D)U-238
18

What fraction of a radioactive isotope remains after 4 half-lives?
A)0
B)1/16
C)¼
D)¾
E)15/16
19

About how old is a piece of charcoal which contains 25% of the original amount of carbon-14?
A)25 years
B)5,700 years
C)>100,000 years
D)11,400 years
E)14 years
20

About how many half lives must pass before 95% of a radioisotope has decomposed?
A)¼
B)½
C)2
D)3
E)4





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