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