chemical engineering nuclear power engineering Mcqs
51. The atomic number of an element is equal to the number of ______________ present in its atom?
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A. Protons

B. Neutrons

C. Either B. or C.

D. Electrons

52. Which of the following isotopes is not present in natural uranium?
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A. U-234

B. U-235

C. U-238

D. U-232
53. Energy equivalent to one atomic mass unit (amu) is ______________ MeV?
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A. 93.1

B. 9310

C. 931

D. 9.31

54. Mass of a positron is same as that of a/an__________________?
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A. Neutron

B. ?-particle

C. Electron

D. Proton

55. Enrichment of uranium is done to increase the concentration of ______________ in the natural uranium?
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A. U-233

B. U-238

C. U-235

D. Pu-239

56. The molecular weight of heavy water is_________________?
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A. 20

B. 10

C. 18

D. 36

57. If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be ____________ days?
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A. 5

B. 10

C. 20

D. 30

58. Coolant used in a boiling water reactor is________________?
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A. Steam

B. Water

C. Hydrogen gas

D. A mixture of water & steam
59. An element having large number of ______________ is most easily subjected to nuclear fission?
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A. Neutrons

B. Nucleons

C. Protons

D. Electrons

60. Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor ?
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A. CO2 gas cooled

B. Molten sodium cooled

C. Pressurised water

D. Boiling water
61. Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around _____________ m/sec?
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A. 2200

B. 9 1021

C. 3 1011

D. 1

62. In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous ________________?
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A. Uranium oxide

B. Uranium carbide

C. Uranium hexafluoride

D. Uranium sulphate

63. In a nuclear explosion, the energy is released primarily in the form of _____________ energy?
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A. Thermal

B. Potential

C. Kinetic

D. Electrical

64. Radioactivity of an isotope is expressed in______________________?
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A. MeV

B. Ergs

C. Curie

D. Barn

65. Artificially produced radioactive isotopes are used for____________________?
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A. All A., B. and C.

B. Initiating nuclear fission and fusion

C. Treatment of certain diseases

D. Power generation

66. Which of the following is not a good moderating material ?
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A. 18/8 stainless steel

B. Concrete

C. Boron

D. All A., B. and C.
67. Heavy water (D2O) in a nuclear reactor serves as a_______________?
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A. Coolant

B. Moderator

C. Both A. & B.

D. Neutron absorber

68. Which of the following accounts for the maximum energy release in the nuclear fission process ?
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A. Kinetic energy of fission products

B. Radioactive decay of fission products

C. Instantaneous release of ?-rays

D. Kinetic energy of neutrons

69. A homogeneous reactor is the one, in which the___________________?
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A. Same substance (e.g. heavy water) is used as moderator & coolant

B. All A., B. and C.

C. Fissile atoms are evenly distributed throughout the mass of nuclear reactor

D. The fuel and the moderator is mixed to form a homogeneous material
70. Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is ______________ kgf/cm2?
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A. 35

B. 7

C. 50

D. 0.2

71. Which of the following is not used as a nuclear fuel cladding material ?
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A. Cadmium

B. Zircaloy

C. Ceramics

D. Stainless steel

72. Which of the following is a moderating material used in nuclear reactor ?
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A. Zircaloy (an alloy of zirconium and aluminium)

B. Stainless steel

C. Graphite

D. Cadmium

73. The size of an atom is of the order of one __________________?
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A. Micron

B. mm

C. Fermi

D. Angstrom
74. Extraction of uranium from its ore is done by ______________ method?
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A. Pyrometallurgical

B. Chemical

C. Electrometallurgical

D. Physical beneficiation

75. Fast breeder reactors are most usable in India, because of our largest _____________ deposits?
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A. Plutonium

B. Thorium

C. Uranium

D. None of these

76. Gas cooling as compared to water cooling of nuclear reactors___________________?
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A. None of these

B. Can produce only saturated steam for feeding to power turbine

C. Is more efficient as gas has a higher specific heat

D. Cannot attain a high temperature

77. The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to ______________ gm?
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A. 1/16

B. 8-Jan

C. 4-Jan

D. 2-Jan

78. Ordinary water is not used as a moderator because, it___________________?
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A. Has a low absorption cross-section

B. Does not absorb neutrons

C. Absorbs neutrons

D. Has a low scattering cross-section

79. The number of neutrons in the nucleus of Uranium-233 (92U233) is _________________?
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A. 92

B. 325

C. 141

D. 233

80. Heavy water is used as a moderator in a _____________________?
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A. Pressurised water reactor (PWR)

B. Candu reactor

C. Boiling water reactor (BWR)

D. Molten sodium cooled reactor

81. Which one is different for the neutral atoms of the isotopes of an element ?
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A. Atomic weights

B. Atomic numbers

C. Number of protons

D. Number of electrons

82. Pick out the wrong statement?
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A. Out of ?, ?, and ?-rays, the one having maximum penetration power are ?-rays

B. Atoms with same number of nucleons but different number of protons are called isobars

C. The product formed by emission of ?-particle has mass number less by 4 units than the parent nuclide

D. Atoms with same number of protons but different number of nucleons are called isoters
83. The phenomenon of radioactivity was discovered by___________________?
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A. J.J. Thomson

B. Becquerel

C. Madam Curie

D. Roentgen

84. The radioisotope used to study the thyroid gland is__________________?
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A. Cobalt

B. Iron

C. Iodine

D. Carbon

85. Which of the following is a fuel for a fusion reactor (thermonuclear reactor) ?
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A. Deuterium and tritium

B. Thorium

C. U-233

D. Heavy water

86. Energy produced in the nuclear fission is of the order of _____________ MeV?
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A. 200

B. 2000

C. 1000

D. 20

87. Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?
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A. ? and ?

B. X

C. Neutrons & gamma

D. Infrared

88. The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?
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A. 2-Jan

B. 1/16

C. 8-Jan

D. 4-Jan

89. Pick out the wrong statement?
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A. Electrons have negligible mass and unit negative change

B. The disintegration rate of a radioactive substance cannot be increased by heating it

C. Deuterium atom has one proton and two neutrons in its nucleus

D. Cadmium is capable of absorbing neutrons

90. Pick out the wrong statement?
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A. ?-particle emission from a radioactive element makes it electrically negative

B. A radioactive element having a half life period of 20 years will completely disintegrated in 40 years

C. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

D. ?-particle emission from a radioactive element makes it electrically positive

91. Which is a fertile nuclear fuel ?
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A. Th-232

B. U-235

C. Pu-239

D. U-233

92. Atoms of U-238 and U-235 differ in structure by three_____________________?
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A. Electrons

B. Neutrons

C. Electrons and three protons

D. Protons

93. Isotopes of an element have different_____________________?
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A. Nuclear charge

B. Chemical properties

C. Electronic configuration

D. Mass number
94. A fertile material is the one, which can be__________________?
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A. Fissioned by slow (thermal) neutrons

B. Fissioned by either slow or fast neutrons

C. Converted into fissile material on absorption of neutron

D. Fissioned by fast neutrons

95. One amu is equivalent to___________________?
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A. 931 J

B. 931 eV

C. 931 Mev

D. 9.31 MeV

96. The disintegration rate of a radioactive element _______________?
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A. Progressively decreases

B. Remains constant throughout

C. Progressively increases

D. May increase or decrease depending on the material

97. The largest stable nucleus is ________________?
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A. U-235

B. Pb-206

C. Bi-209

D. U-238

98. Heat is generated in a nuclear reactor (thermal) by_________________?
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A. Absorption of neutrons in uranium atoms

B. Fission of U-235 by neutrons

C. Fusion of atoms of uranium

D. Combustion of a nuclear fuel e.g. uranium

99. Critical energy should be _______________ the neutron binding energy of the atom in order to initiate a nuclear fission?
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A. More than

B. Less than

C. Either more or less

D. Equal to

100. Which of the following undergoes fission reaction easily ?
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A. None of these

B. U-238

C. Th-232

D. U-235