In nuclear power stations, a chain reaction is required. What is a chain reaction?
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Reactions in which one reaction causes further reactions, which cause further reactions etc.
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Reactions in which when the first reaction has occurred others are prevented
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Reactions in which when a certain number of reactions have occurred others are prevented
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Reactions which will never stop
Q.2.
What happens to the excess neutrons?
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They decay into protons and electrons
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They decay into electrons
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They are absorbed by other atoms creating more atoms to split into smaller atoms
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They bond with other free neutrons to create a large neutron mass
Q.3.
In a nuclear reactor, water is used as a moderator. What is a moderator?
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A substance which speeds up a nuclear reaction
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A substance which slows down the fission neutrons
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A substance which slows down the production of electricity
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A substance that absorbs surplus neutrons
Q.4.
What is an advantage of nuclear fission?
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It creates radioactive material
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A low percentage of energy is output compared to energy input into the process
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A large amount of fissionable material is needed
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A small amount of fissionable material is needed
Q.5.
Which two fissionable substances are commonly used in nuclear reactors?
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Uranium and plutonium
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Carbon and oxygen
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Neon and lithium
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Boron and hydrogen
Q.6.
What is a disadvantage of nuclear fission?
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It creates radioactive waste
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A large amount of fissionable material is needed
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It produces vast amounts of energy
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Nuclear power plants are cheap to build
Q.7.
What must a nucleus absorb for fission to occur?
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Proton
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Neutron
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Electron
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Heat
Q.8.
What happens to the atom after it absorbs a neutron?
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The atom becomes unstable and decays into two smaller atoms releasing more neutrons and energy
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It loses an electron
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It loses a proton
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The neutron is ejected
Q.9.
If Uranium-235 and one neutron are collided together they can create one Kr and 1 Ba . In this circumstance, how many free neutrons are released in this reaction?
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1
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2
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3
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4
Q.10.
What is nuclear fission?
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It is the process by which stars generate light and heat
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Fission is the splitting of an atomic nucleus creating two smaller atomic nuclei
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Fission is the fusion of two atoms to create a heavier atom
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Fission is the process by which electrons are removed from an element
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