Heavy water is preferred over ordinary water as a coolant, because it.
Heavy water is preferred over ordinary water as a coolant, because it.
A radioactive substance does not emit
A radioactive substance does not emit
When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as
When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as
A homogeneous reactor is the one, in which the
A homogeneous reactor is the one, in which the
Which of the following is the most harmful for the human being?
Which of the following is the most harmful for the human being?
Out of the following places, heavy water plant is not located at
Out of the following places, heavy water plant is not located at
Which of the following accounts for the maximum energy release in the nuclear fission process?
Which of the following accounts for the maximum energy release in the nuclear fission process?
Radioactive decay is a __________ change.
Radioactive decay is a __________ change.
The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.
The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.
Atoms with same number of neutrons, but different number of nucleons are called
Atoms with same number of neutrons, but different number of nucleons are called
The half life period of a radioactive element depends upon the
The half life period of a radioactive element depends upon the
Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of
Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of
Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
The emission of an a-particle causes the resultant nucleus to have
The emission of an a-particle causes the resultant nucleus to have
Heavy water (D₂O) in a nuclear reactor serves as a
Heavy water (D₂O) in a nuclear reactor serves as a
Fission of U-235 on slow neutron bombardment can be represented by
Fission of U-235 on slow neutron bombardment can be represented by
A boiling water reactor is the one, in which the
A boiling water reactor is the one, in which the
An element having large number of __________ is most easily subjected to nuclear fission.
An element having large number of __________ is most easily subjected to nuclear fission.
Extraction of uranium from its ore is done by __________ method.
Extraction of uranium from its ore is done by __________ method.
Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?
Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?
Fuel for a nuclear reactor (thermal) is
Fuel for a nuclear reactor (thermal) is
The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.
The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.
A fast breeder reactor
A fast breeder reactor
Atoms of U-238 and U-235 differ in structure by three
Atoms of U-238 and U-235 differ in structure by three
Graphite is used in nuclear reactor as
Graphite is used in nuclear reactor as
In a homogeneous nuclear reactor, the __________ are mixed together.
In a homogeneous nuclear reactor, the __________ are mixed together.
Nucleus of 92U235 contains __________ protons.
Nucleus of 92U235 contains __________ protons.
The disintegration rate of a radioactive element
The disintegration rate of a radioactive element
Heavy water used in the nuclear reactors to slow down the speed of neutrons is
Heavy water used in the nuclear reactors to slow down the speed of neutrons is
Fast breeder test reactor at Kalpakkam is designed for using
Fast breeder test reactor at Kalpakkam is designed for using
Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)?
Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)?
Thorium⁻²32 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.
Thorium⁻²32 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.
A thermal nuclear reactor compared to a fast breeder reactor
A thermal nuclear reactor compared to a fast breeder reactor
Heat is generated in a nuclear reactor (thermal) by
Heat is generated in a nuclear reactor (thermal) by
Which is a fertile nuclear fuel?
Which is a fertile nuclear fuel?
The time required for half of the __________ of a radioactive isotope to decay is called its half life.
The time required for half of the __________ of a radioactive isotope to decay is called its half life.
Which of the following may be used to measure the rate of nuclear disintegration?
Which of the following may be used to measure the rate of nuclear disintegration?
Spent fuel from the nuclear thermal reactor contains
Spent fuel from the nuclear thermal reactor contains
The radioisotope used to study the thyroid gland is
The radioisotope used to study the thyroid gland is
Percentage of U-238 in natural uranium is around
Percentage of U-238 in natural uranium is around
Which of the following is artificially produced as it does not occur in nature?
Which of the following is artificially produced as it does not occur in nature?
The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
The size of an atom is of the order of one
The size of an atom is of the order of one
Function of control rod in a nuclear reactor is to control
Function of control rod in a nuclear reactor is to control
The 92U238 emits an a-particle. The product is
The 92U238 emits an a-particle. The product is
Percentage of the heavy water in ordi water is around
Percentage of the heavy water in ordi water is around
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.
Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.
Pick out the correct statement.
Pick out the correct statement.
The ratio of volume of an atom to that of its nucleus is
The ratio of volume of an atom to that of its nucleus is
Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 10¹³ to 10¹⁴ neutrons/cm² second.
Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 10¹³ to 10¹⁴ neutrons/cm² second.
Hydrogen bomb employs the nuclear fusion of
Hydrogen bomb employs the nuclear fusion of
Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.
Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.
The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?
The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?
Candu reactor is a __________ nuclcear reactor.
Candu reactor is a __________ nuclcear reactor.
A control rod
A control rod
Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has
Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has
Extraction of uranium from its ore is done using __________ methods.
Extraction of uranium from its ore is done using __________ methods.
Which of the following ores contains maximum percentage of uranium?
Which of the following ores contains maximum percentage of uranium?
In nuclear reactions, __________ number is conserved.
In nuclear reactions, __________ number is conserved.
Which is the most commonly used molten metal for cooling of nuclear reactors?
Which is the most commonly used molten metal for cooling of nuclear reactors?
The most abundant isotope of natural uranium is
The most abundant isotope of natural uranium is
Out of the followingplaces, a nuclear power plant is not located at
Out of the followingplaces, a nuclear power plant is not located at
The function of moderators in nuclear reactor is to
The function of moderators in nuclear reactor is to
The critical mass of a fissionable material can be reduced by
The critical mass of a fissionable material can be reduced by
The phenomenon of radioactivity was discovered by
The phenomenon of radioactivity was discovered by
Sodium melts (at atmospheric pressure) at a temperature of __________ °C.
Sodium melts (at atmospheric pressure) at a temperature of __________ °C.
U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent.
U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent.
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
The molecular weight of heavy water is
The molecular weight of heavy water is
Thorium⁻²32 is converted into uranium⁻²33 in a/an __________ nuclear reactor.
Thorium⁻²32 is converted into uranium⁻²33 in a/an __________ nuclear reactor.
Pressure in a Pressurised Water Reactor (PWR) is used for
Pressure in a Pressurised Water Reactor (PWR) is used for
Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to
Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to
Heavy water plant is not located at
Heavy water plant is not located at
In the nuclear reaction, 93N239 → 93Pu239 + ?; the missing particle is a/an
In the nuclear reaction, 93N239 → 93Pu239 + ?; the missing particle is a/an
Which of the following is not used as a nuclear fuel cladding material?
Which of the following is not used as a nuclear fuel cladding material?
Uranium is recovered from its ore (pitchblende) by
Uranium is recovered from its ore (pitchblende) by
Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
Nuclides having the same atomic numbers are termed as
Nuclides having the same atomic numbers are termed as
The mass number of an element is equal to the number of __________ in the nucleus.
The mass number of an element is equal to the number of __________ in the nucleus.
Radioactivity of an isotope is expressed in
Radioactivity of an isotope is expressed in
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is
The decrease in the atomic number is not observed in case of
The decrease in the atomic number is not observed in case of
An electron has a mass that is approximately __________ that of the proton.
An electron has a mass that is approximately __________ that of the proton.
The atomic number of an element is equal to the number of __________ present in its atom.
The atomic number of an element is equal to the number of __________ present in its atom.
Ceramic nuclear metals compared to solid nuclear metals have
Ceramic nuclear metals compared to solid nuclear metals have
Nuclear power plant is not located at
Nuclear power plant is not located at
Nuclear fuel usually used in a Boiling Water Reactor (BWR) is
Nuclear fuel usually used in a Boiling Water Reactor (BWR) is
Fuel for a fast breeder reactor is
Fuel for a fast breeder reactor is
β-rays emission in radioactive disintegration is always accompanied by the emission of
β-rays emission in radioactive disintegration is always accompanied by the emission of
Coolant used in a boiling water reactor is
Coolant used in a boiling water reactor is
Coolant used in a fast breeder reactor is
Coolant used in a fast breeder reactor is
Use of molten metal as a coolant in fast breeder reactor helps in
Use of molten metal as a coolant in fast breeder reactor helps in
Heavy water plant is not located at
Heavy water plant is not located at
__________ have the same mass number, but different nuclear charge.
__________ have the same mass number, but different nuclear charge.
Moderating material used in a thermal-reactor should be a
Moderating material used in a thermal-reactor should be a
Which of the following is a fuel for a fusion reactor (thermonuclear reactor)?
Which of the following is a fuel for a fusion reactor (thermonuclear reactor)?
Energy equivlant to one atomic mass unit (amu) is __________ MeV.
Energy equivlant to one atomic mass unit (amu) is __________ MeV.
