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Daily Concept Quiz
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1

Alpha particles bounce backwards when fired at a sheet of thin gold foil because
A)the alpha particles are repelled by the electronic structure of the atoms.
B)the alpha particles bounce away from the nuclei of the atoms.
C)the alpha particles bounce away from the crystalline structure of the atoms.
2

In a neutral atom
A)the number of protons equals the number of neutrons.
B)the number of neutrons equals the number of electrons.
C)the number of electrons equals the number of protons.
3

Which atom is an isotope of 84Be?
A)85Be
B)74Be
C)84He
D)84Li
4

Of the three types of radiation listed below, which travels at the speed of light?
A)Alpha
B)Beta
C)Gamma
D)All do
E)None do
5

If a radioactive substance’s half-life is 64 days, how much is left after 128 days?
A)None
B)Half
C)One fourth
D)All of it
6

Which is bigger?
A)1 eV
B)1 J
C)1 MeV
D)1 calorie
7

An alpha particle is made up of two protons and two neutrons. The mass of an alpha particle is
A)smaller than the combined mass of two protons and two neutrons.
B)the same as the combined mass of two protons and two neutrons.
C)bigger than the combined mass of two protons and two neutrons.
8

In a graph of the binding energy per nucleon versus mass number A, the maximum binding energy per nucleon occurs for iron with mass number A=56. This means
A)iron can easily be split in a fission process.
B)iron can easily be fused in a fusion process.
C)iron is the most stable element.
9

235U goes through a fission process when
A)it absorbs a neutron and forms an unstable nucleus.
B)a neutron collides into it splitting it into two smaller atoms.
C)two smaller nuclei combine together to produce it.
10

The rate of fission reactions in a nuclear reactor is controlled by
A)adjusting the percentage of fissionable uranium in the core.
B)using a moderator to turn fast neutrons into slow neutrons.
C)Both of these.
D)Neither of these.
11

Which of the following processes do we currently use to produce energy in controlled nuclear fusion?
A)Confining small nuclei using magnetic fields
B)Confining small nuclei using laser beams
C)Both of these
D)Neither of these





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