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Latest NPCIL Stipendiary Trainee Plant Operator Exam Question (Objective Questions), MCQ in English

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Question Bank NPCIL Stipendiary Trainee (Plant Operator) Advanced Test Exam - English
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Operator

Question 1Single Answer
What are the three fundamental particles that make up an atom?
  1. A
    Protons, electrons, and neutrons
  2. B
    Quarks, leptons, and bosons
  3. C
    Nucleons, positrons, and photons
  4. D
    Alpha, beta, and gamma particles
Question 2Single Answer
What is the charge of a proton?
  1. A
    Negative
  2. B
    Positive
  3. C
    Neutral
  4. D
    Variable
Question 3Single Answer
What is the charge of an electron?
  1. A
    Positive
  2. B
    Negative
  3. C
    Neutral
  4. D
    Variable
Question 4Single Answer
What is the charge of a neutron?
  1. A
    Positive
  2. B
    Negative
  3. C
    Neutral
  4. D
    Variable
Question 5Single Answer
What is the atomic number of an element?
  1. A
    The number of neutrons in the nucleus
  2. B
    The number of protons in the nucleus
  3. C
    The total number of nucleons
  4. D
    The number of electrons orbiting the nucleus
Question 6Single Answer
What is the mass number of an element?
  1. A
    The number of protons in the nucleus
  2. B
    The number of neutrons in the nucleus
  3. C
    The sum of protons and neutrons in the nucleus
  4. D
    The number of electrons orbiting the nucleus
Question 7Single Answer
What are isotopes?
  1. A
    Atoms with the same number of neutrons but different numbers of protons
  2. B
    Atoms with the same number of protons but different numbers of neutrons
  3. C
    Atoms with the same number of electrons but different numbers of protons
  4. D
    Atoms with the same mass number but different atomic numbers
Question 8Single Answer
What is radioactivity?
  1. A
    The process of chemical reactions in atoms
  2. B
    The spontaneous emission of particles or energy from unstable nuclei
  3. C
    The absorption of light by atoms
  4. D
    The ionization of atoms by electric fields
Question 9Single Answer
What are the three main types of radioactive decay?
  1. A
    Fusion, fission, and combustion
  2. B
    Alpha, beta, and gamma decay
  3. C
    Oxidation, reduction, and hydrolysis
  4. D
    Conduction, convection, and radiation
Question 10Single Answer
What is an alpha particle?
  1. A
    An electron
  2. B
    A helium nucleus
  3. C
    A high-energy photon
  4. D
    A neutron
Question 11Single Answer
What is a beta particle?
  1. A
    A helium nucleus
  2. B
    A high-energy photon
  3. C
    An electron or positron
  4. D
    A neutron
Question 12Single Answer
What is a gamma ray?
  1. A
    A helium nucleus
  2. B
    A high-energy photon
  3. C
    An electron
  4. D
    A neutron
Question 13Single Answer
What is nuclear fission?
  1. A
    The combining of two light nuclei into a heavier one
  2. B
    The splitting of a heavy nucleus into two lighter nuclei
  3. C
    The emission of alpha particles
  4. D
    The emission of beta particles
Question 14Single Answer
What is nuclear fusion?
  1. A
    The splitting of a heavy nucleus into two lighter nuclei
  2. B
    The combining of two light nuclei into a heavier one
  3. C
    The emission of gamma rays
  4. D
    The absorption of neutrons
Question 15Single Answer
What is a chain reaction in nuclear fission?
  1. A
    A series of chemical reactions
  2. B
    A self-sustaining series of nuclear fissions
  3. C
    A series of nuclear fusions
  4. D
    The emission of gamma rays
Question 16Single Answer
What is a moderator in a nuclear reactor?
  1. A
    A material that absorbs neutrons
  2. B
    A material that slows down neutrons
  3. C
    A material that increases neutron energy
  4. D
    A material that produces neutrons
Question 17Single Answer
What is a control rod in a nuclear reactor?
  1. A
    A material that slows down neutrons
  2. B
    A material that absorbs neutrons
  3. C
    A material that increases neutron energy
  4. D
    A material that produces neutrons
Question 18Single Answer
What is the purpose of a coolant in a nuclear reactor?
  1. A
    To slow down neutrons
  2. B
    To absorb neutrons
  3. C
    To remove heat from the reactor core
  4. D
    To produce neutrons
Question 19Single Answer
What is the half-life of a radioactive isotope?
  1. A
    The time it takes for all the radioactive atoms to decay
  2. B
    The time it takes for half of the radioactive atoms to decay
  3. C
    The time it takes for the isotope to become stable
  4. D
    The time it takes for the isotope to emit gamma rays
Question 20Single Answer
What is the strong nuclear force?
  1. A
    The force that holds electrons in the atom
  2. B
    The force that holds protons and neutrons together in the nucleus
  3. C
    The force that causes radioactive decay
  4. D
    The force that causes chemical reactions
Question 21Single Answer
What is the weak nuclear force?
  1. A
    The force that holds protons and neutrons together
  2. B
    The force responsible for beta decay
  3. C
    The force that holds electrons in the atom
  4. D
    The force that causes chemical reactions
Question 22Single Answer
What is the electromagnetic force?
  1. A
    The force that holds protons and neutrons together
  2. B
    The force that causes beta decay
  3. C
    The force that holds electrons in the atom and causes chemical reactions
  4. D
    The force that causes radioactive decay
Question 23Single Answer
What is the gravitational force?
  1. A
    The force that holds protons and neutrons together
  2. B
    The force that causes beta decay
  3. C
    The force that holds electrons in the atom
  4. D
    The force of attraction between masses
Question 24Single Answer
What is the binding energy of a nucleus?
  1. A
    The energy released when a nucleus decays
  2. B
    The energy required to separate a nucleus into its constituent nucleons
  3. C
    The kinetic energy of the nucleons
  4. D
    The energy of the electrons orbiting the nucleus
Question 25Single Answer
What is mass defect?
  1. A
    The difference in the number of protons and neutrons
  2. B
    The difference between the mass of a nucleus and the sum of the masses of its constituent nucleons
  3. C
    The mass of an electron
  4. D
    The mass of a photon
Question 26Single Answer
What is the relationship between mass defect and binding energy?
  1. A
    They are unrelated
  2. B
    Binding energy is directly proportional to mass defect
  3. C
    Binding energy is inversely proportional to mass defect
  4. D
    Mass defect is the square of binding energy
Question 27Single Answer
What is the unit of radioactivity?
  1. A
    Joule
  2. B
    Watt
  3. C
    Becquerel (Bq) or Curie (Ci)
  4. D
    Newton
Question 28Single Answer
What is the unit of absorbed radiation dose?
  1. A
    Becquerel
  2. B
    Sievert (Sv) or Gray (Gy)
  3. C
    Watt
  4. D
    Coulomb
Question 29Single Answer
What is the purpose of shielding in a nuclear facility?
  1. A
    To increase radiation levels
  2. B
    To absorb and reduce radiation levels
  3. C
    To produce neutrons
  4. D
    To increase nuclear reactions
Question 30Single Answer
Which material is commonly used as a neutron moderator?
  1. A
    Uranium
  2. B
    Plutonium
  3. C
    Graphite or heavy water
  4. D
    Lead
Question 31Single Answer
Which material is commonly used as a control rod in a nuclear reactor?
  1. A
    Uranium
  2. B
    Cadmium or boron
  3. C
    Graphite
  4. D
    Water
Question 32Single Answer
What is the critical mass in nuclear fission?
  1. A
    The minimum mass of fissile material required to sustain a chain reaction
  2. B
    The maximum mass of fissile material
  3. C
    The mass of the moderator
  4. D
    The mass of the control rods
Question 33Single Answer
What is the role of the reflector in a nuclear reactor?
  1. A
    To absorb neutrons
  2. B
    To reflect neutrons back into the core
  3. C
    To slow down neutrons
  4. D
    To produce neutrons
Question 34Single Answer
What is the primary product of nuclear fusion in stars?
  1. A
    Uranium
  2. B
    Plutonium
  3. C
    Helium
  4. D
    Lead
Question 35Single Answer
What is the process of neutron activation?
  1. A
    The emission of neutrons
  2. B
    The absorption of neutrons by a nucleus, making it radioactive
  3. C
    The slowing down of neutrons
  4. D
    The splitting of neutrons
Question 36Single Answer
What is the purpose of a containment structure in a nuclear power plant?
  1. A
    To produce neutrons
  2. B
    To contain radioactive materials in case of an accident
  3. C
    To slow down neutrons
  4. D
    To increase nuclear reactions
Question 37Single Answer
What is the difference between nuclear fission and nuclear fusion in terms of energy release?
  1. A
    Fission releases more energy than fusion
  2. B
    Fusion releases more energy than fission
  3. C
    They release the same amount of energy
  4. D
    Only fission releases energy
Question 38Single Answer
in nuclear reactions?
  1. A
    It explains chemical reactions
  2. B
    It relates mass and energy, showing that mass can be converted into energy and vice versa
  3. C
    It describes the motion of electrons
  4. D
    It explains gravitational forces
Question 39Single Answer
What is the role of delayed neutrons in controlling a nuclear reactor?
  1. A
    They increase the rate of fission
  2. B
    They allow for precise control of the chain reaction
  3. C
    They absorb neutrons
  4. D
    They produce prompt neutrons
Question 40Single Answer
What is the process of radioactive dating?
  1. A
    Using chemical reactions to determine the age of a sample
  2. B
    Using the decay of radioactive isotopes to determine the age of a sample
  3. C
    Using the emission of light to determine the age of a sample
  4. D
    Using the absorption of neutrons to determine the age of a sample
Question 41Single Answer
What is the significance of the neutron-to-proton ratio in nuclear stability?
  1. A
    It has no effect on nuclear stability
  2. B
    It determines the stability of a nucleus
  3. C
    It affects chemical reactions
  4. D
    It influences the emission of light
Question 42Single Answer
What is the role of a breeder reactor?
  1. A
    To produce electricity without producing fissile material
  2. B
    To produce more fissile material than it consumes
  3. C
    To slow down neutrons
  4. D
    To absorb neutrons
Question 43Single Answer
What is the process of transmutation in nuclear reactions?
  1. A
    The emission of light
  2. B
    The change of one element into another
  3. C
    The splitting of a nucleus
  4. D
    The combining of nuclei
Question 44Single Answer
What is the significance of the Coulomb barrier in nuclear fusion?
  1. A
    It increases the rate of fusion
  2. B
    It is the electrostatic repulsion between positively charged nuclei
  3. C
    It absorbs neutrons
  4. D
    It produces neutrons
Question 45Single Answer
What is the purpose of a pressure vessel in a nuclear reactor?
  1. A
    To produce neutrons
  2. B
    To contain the reactor core and coolant under high pressure
  3. C
    To slow down neutrons
  4. D
    To absorb neutrons
Question 46Single Answer
What is the role of a turbine in a nuclear power plant?
  1. A
    To produce neutrons
  2. B
    To convert thermal energy into mechanical energy
  3. C
    To slow down neutrons
  4. D
    To absorb neutrons
Question 47Single Answer
What is the process of neutron capture?
  1. A
    The emission of neutrons
  2. B
    The absorption of neutrons by a nucleus
  3. C
    The slowing down of neutrons
  4. D
    The splitting of neutrons
Question 48Single Answer
What is the significance of prompt neutrons in a nuclear chain reaction?
  1. A
    They allow for precise control of the chain reaction
  2. B
    They are emitted immediately upon fission and sustain the chain reaction
  3. C
    They absorb neutrons
  4. D
    They produce delayed neutrons
Question 49Single Answer
What is the purpose of a condenser in a nuclear power plant?
  1. A
    To produce neutrons
  2. B
    To condense steam back into water for reuse
  3. C
    To slow down neutrons
  4. D
    To absorb neutrons
Question 50Single Answer
What is radioactivity?
  1. A
    A chemical reaction
  2. B
    The spontaneous emission of particles or energy from unstable nuclei
  3. C
    The absorption of light by atoms
  4. D
    The ionization of gases
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