fission reactions in an atomic bomb proceed primarily by
A spontaneous disintegration of nuclei
B high temperature collisions between nuclei
C disintegration of nuclei stimulated by neutrons
D high density contact between nuclei
why are fission reactions unimportant in stars
A insufficient energy is released per reaction
B too little fuel is available
C the temperature is too high
D stars are too large
fission reactors would be undesirable sources of power because
A they give off undesirable by-products
B the fuel is rare
C catastrophic industrial accidents are possible
D all of these.
an advantage of fission reactions as a source of energy for man is
A plentiful, cheap fuel
B that they are easily controlled
C that they produce little dangerous waste material
D that they are easy to understand
the explosive power of an atomic bomb comes from
A a combustion reaction
B a TNT explosion
C a fission reaction
D a fusion reaction
a chain reaction occurs when
A one of the fragments of a fission stimulates another nucleus to fission
B one of the fragments of a fission itself fissions
C several nuclei simultaneously fission
D any ordinary chemical reaction occurs
a necessary condition for the occurrence of explosive fission reactions in the appropriate fuel is
A high temperature
B critical mass
C proper catalyst
D free neutrons
which type of reaction is most easily controlled
A fusion
B fission
C TNT
D gravitational
we know that uranium cannot be the main source of energy for the sun since
A the sun contains no uranium at all
B the sun contains some uranium, but too little
C neutrons necessary for this nuclear reaction are missing in the sun
D the temperature is too high for this reaction to take place
which of the following reactions results in a chain reaction
A proton-proton chain
B carbon cycle
C ordinary combustion reactions
D fission of uranium
natural radioactivity involves which of the following?
A absorption of energy by an orbital electron.
B emission of energy by an orbital electron.
C absorption of energy by an atomic nucleus.
D emission of energy by an atomic nucleus.
for which of the following can a chain reaction occur
A chemical reactions
B radioactive decay
C fusion
D fission reactions
a disadvantage of fission reactions as a source of energy for man is that they
A are not easily controllable
B produce dangerous waste material
C are not easy to understand
D are too destructive
uranium may be an undesirable commercial source of energy because of
A the danger of catastrophic accidents
B the dangerous by products produced
C the relative scarcity of available ore
D all of these
fission reactions are unlikely to be the principle source of energy for stars because
A they don't produce very much energy per reaction
B undesirable by-products are also produced
C the temperature in a star is too great
D the appropriate elements are too scarce in ordinary stars
which of the following is not a problem or disadvantage for current nuclear reactors
A scarce fuel
B difficult to control reactions
C possible leakage of radioactive waste into the atmosphere
D dangerous waste products
a fission chain reaction depends upon
A the release of neutrons at each fission
B very high temperatures
C a light chemical element for fuel
D a source of control for the reactions
the energy released in one fission reaction is equal to the energy released in the explosion of
A 1000 TNT atoms
B 10,000,000 TNT atoms
C one pound of TNT
D 10,000 tons of TNT
when the critical mass of uranium is exceeded, the chain reaction
A occurs explosively
B continues at the same rate
C ceases
D slows to the ordinary rate.
for which of the following is a chain reaction necessary to obtain "usable" energy in a "reasonable" time
A fission reactions
B fusion reactions
C chemical reactions
D none of the above
a quantity of uranium greater than the critical mass is necessary to
A begin a chain reaction
B produce sufficient energy for use in a nuclear power plant
C create an explosive chain reaction
D initiate a chain reaction that will eventually consume the entire Earth
a disadvantage of commercial nuclear reactors is
A the large quantity of waste produced
B the dangerous waste produced
C the depletion of a scarce resource needed for other purposes
D the low grade of electricity produced
uranium is used in
A fusion reactions
B fission reactions
C solar reactions
D lasers
fission reactions could not be an important source of energy for stars because
A the temperature is too high
B there are not enough neutrons present
C heavy elements are too scarce
D they would blow the star apart
for which of the following is a chain reaction necessary for "useful" results
A fission reactions
B fusion reactions
C chemical reactions
D none of the above
which of the following is not a disadvantage of commercial nuclear power
A undesirable waste products are produced
B an atomic explosion might accidentally occur
C a scarce fuel must be used
D radioactivity might be released into the environment during an accident
a typical element involved in a fission reaction is
A hydrogen
B carbon
C iron
D uranium
a breeder reactor
A produces new fuel while producing energy
B is used to manufacture natural gas
C is a fusion type reactor
D is technically impossible
a chain reaction results when
A four protons combine to form a helium nucleus
B a neutron released by the break-up of a uranium atom stimulates another uranium atom to break-up
C protons and electrons combine to form neutrons in a neutron star
D carbon is used to convert hydrogen to helium
a nuclear explosion cannot occur in a commercial nuclear reactor because
A the fuel cannot get hot enough
B backup control systems will never fail
C the fuel is not sufficiently pure
D the wrong kind of fuel is used
currently available nuclear reactors employ
A fission reactions
B fusion reactions
C radioactive decay
D chemical reactions
the energy produced in a fission reactor
A can be controlled by limiting the number of neutrons released during each fission
B can be controlled by lowering the temperature
C can be controlled by limiting the number of neutrons which stimulate additional fissions
D cannot be controlled
a chain reaction occurs when
A hydrogen nuclei combine to form helium
B neutrons from uranium disintegration stimulate other uranium nuclei to break-up
C gravitational energy is converted into heat
D coal is burned.
current nuclear power plants derive their energy from
A nuclear reactions involving the break-up of a nucleus
B nuclear reactions involving the combining of several nuclei into one
C very intense chemical reactions
D nuclear radioactivity
concerns raised about the use of fission reactors include
A the scarcity of the fuel
B the undesirable waste products
C the possibility of catastrophic accidents
D all of these
the energy released in a fission reactor can be controlled by
A controlling the number of neutrons released during each fission
B controlling the fraction of neutrons which stimulate additional fissions
C preventing certain atoms from breaking up
D changing the type of atom which is breaking up
a nuclear explosion cannot occur accidentally in a nuclear power plant because
A there is not enough uranium present
B of all the safeguards built into the plant
C the operators will flood the building before they let it happen
D the uranium fuel is not pure enough
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