MCQOPTIONS
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MCQOPTIONS
This section includes 160 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The critical mass of a fissionable material can be reduced by__________________? |
| A. | Heating it |
| B. | Cooling it |
| C. | Surrounding it by neutron reflecting material |
| D. | Surrounding it by neutron absorbing material |
| Answer» D. Surrounding it by neutron absorbing material | |
| 52. |
The atomic mass of an element is fractional, because ______________________? |
| A. | Of uncertainty principle |
| B. | It may have isobars |
| C. | It contains neutrons |
| D. | It may have isotopes |
| Answer» E. | |
| 53. |
The atomic number of an element is equal to the number of ______________ present in its atom? |
| A. | Neutrons |
| B. | Electrons |
| C. | Protons |
| D. | Either B. or C. |
| Answer» E. | |
| 54. |
The atomic number of a radioactive element is not changed, when it emits _____________ rays? |
| A. | α |
| B. | β |
| C. | γ |
| D. | α & β |
| Answer» D. α & β | |
| 55. |
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight? |
| A. | 1/2 |
| B. | 1/4 |
| C. | 1/8 |
| D. | 1/16 |
| Answer» E. | |
| 56. |
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent? |
| A. | 3.125 |
| B. | 6.25 |
| C. | 12.50 |
| D. | 25 |
| Answer» C. 12.50 | |
| 57. |
Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of___________________? |
| A. | High carbon steel |
| B. | Molybdenum |
| C. | Zircaloy |
| D. | Boron or cadmium |
| Answer» E. | |
| 58. |
Research reactors are normally meant for_____________________? |
| A. | Producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on different materials |
| B. | Accelerating the neutrons |
| C. | Power generation |
| D. | None of these |
| Answer» B. Accelerating the neutrons | |
| 59. |
Radioactivity of an isotope is expressed in______________________? |
| A. | Barn |
| B. | MeV |
| C. | Curie |
| D. | Ergs |
| Answer» D. Ergs | |
| 60. |
Radioactive decay of a material involves a _____________ order reaction? |
| A. | Third |
| B. | Second |
| C. | First |
| D. | Zero |
| Answer» D. Zero | |
| 61. |
Radioactive decay is a _____________ change? |
| A. | Chemical |
| B. | Nuclear |
| C. | Physical |
| D. | None of these |
| Answer» C. Physical | |
| 62. |
Quantity of fissionable material (i.e. U-235) in natural uranium is _____________ percent? |
| A. | 0.71 |
| B. | 6.31 |
| C. | 99.29 |
| D. | 12.73 |
| Answer» B. 6.31 | |
| 63. |
Primary purpose of a ____________ nuclear reactor is to supply a high neutron flux of the order of 1013 to 1014neutrons/cm2 second? |
| A. | Research |
| B. | Power |
| C. | Breeder |
| D. | Homogeneous |
| Answer» B. Power | |
| 64. |
Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is ______________ kgf/cm2? |
| A. | 0.2 |
| B. | 7 |
| C. | 35 |
| D. | 50 |
| Answer» C. 35 | |
| 65. |
Pressure in a Pressurised Water Reactor (PWR) is used for ____________________? |
| A. | Maintaining constant pressure in the primary cooling circuit under varying loads |
| B. | Superheating the steam |
| C. | Pressurising the water in the primary coolant circuit |
| D. | None of these |
| Answer» B. Superheating the steam | |
| 66. |
Plutonium________________? |
| A. | Is recovered from spent fuel from thermal nuclear reactor |
| B. | Has much lower melting point (640°C ) compared to thorium (1690°C) |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 67. |
Percentage of U-238 in natural uranium is around__________________? |
| A. | 0.71 |
| B. | 99.29 |
| C. | 0.015 |
| D. | 29.71 |
| Answer» C. 0.015 | |
| 68. |
Percentage of the heavy water in ordinary water is around ____________________? |
| A. | 0.015 |
| B. | 7.54 |
| C. | 0.71 |
| D. | 32.97 |
| Answer» B. 7.54 | |
| 69. |
Percentage of heavy water in ordinary water is around__________________? |
| A. | 0.015 |
| B. | 7.54 |
| C. | 0.71 |
| D. | 32.97 |
| Answer» B. 7.54 | |
| 70. |
Out of the following, nucleus of _____________ atom contains the largest number of neutrons? |
| A. | U-235 |
| B. | U-238 |
| C. | U-239 |
| D. | Pu-239 |
| Answer» D. Pu-239 | |
| 71. |
Out of the following places, a nuclear power plant is not located at______________? |
| A. | Talcher (Orissa) |
| B. | Kaiga (Karnataka) |
| C. | Rawatbhata (Rajasthan) |
| D. | Kalpakkam (Tamilnadu) |
| Answer» B. Kaiga (Karnataka) | |
| 72. |
Ordinary water is not used as a moderator because, it___________________? |
| A. | Has a low absorption cross-section |
| B. | Has a low scattering cross-section |
| C. | Absorbs neutrons |
| D. | Does not absorb neutrons |
| Answer» D. Does not absorb neutrons | |
| 73. |
One ‘amu’ is equivalent to___________________? |
| A. | 9.31 MeV |
| B. | 931 eV |
| C. | 931 Mev |
| D. | 931 J |
| Answer» D. 931 J | |
| 74. |
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is_______________? |
| A. | 3 |
| B. | 235 |
| C. | 200 |
| D. | 92 |
| Answer» B. 235 | |
| 75. |
Nuclides having the same atomic numbers are termed as___________________? |
| A. | Isotopes |
| B. | Isomers |
| C. | Isotones |
| D. | Isobars |
| Answer» C. Isotones | |
| 76. |
Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays? |
| A. | X |
| B. | α and β |
| C. | Neutrons & gamma |
| D. | Infrared |
| Answer» D. Infrared | |
| 77. |
____________ nuclear reactor does not require a heat exchanger to supply steam to power turbine? |
| A. | Molten sodium cooled |
| B. | Helium cooled |
| C. | Boiling water |
| D. | Pressurised water |
| Answer» D. Pressurised water | |
| 78. |
Nuclear fuel usually used in a Boiling Water Reactor (BWR) is__________________? |
| A. | Plutonium |
| B. | Enriched uranium |
| C. | Natural uranium |
| D. | Thorium |
| Answer» C. Natural uranium | |
| 79. |
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher _____________________? |
| A. | Melting point, hence can be subjected to higher temperature |
| B. | Density; hence core volume for a given power output would be smaller |
| C. | Resistance to effects of irradiation |
| D. | All A., B. and C. |
| Answer» E. | |
| 80. |
Nuclear fuel complex, Hyderabad is engaged in the job of ___________________? |
| A. | Manufacture of nuclear fuel elements/assemblies |
| B. | Processing of uranium ore |
| C. | Treatment of spent fuel |
| D. | None of these |
| Answer» B. Processing of uranium ore | |
| 81. |
Neutrons have mass approximately equal to that of _____________ atoms? |
| A. | Hydrogen |
| B. | Helium |
| C. | Deuterium |
| D. | None of these |
| Answer» B. Helium | |
| 82. |
Net efficiency of ordinary light water cooled nuclear reactor is about _____________ percent? |
| A. | 32 |
| B. | 52 |
| C. | 72 |
| D. | 88 |
| Answer» B. 52 | |
| 83. |
Molten sodium is used as a coolant in a fast breeder reactor, because of its_________________? |
| A. | Excellent moderating properties |
| B. | Neutron breeding capability |
| C. | Faster heat removal capability from the core |
| D. | Capability to increase the reaction rate in the core |
| Answer» D. Capability to increase the reaction rate in the core | |
| 84. |
Molten sodium (as a coolant in fast breeder reactor) ? |
| A. | Can’t attain high temperature at normal pressure |
| B. | Is not at all corrosive, even at a higher temperature |
| C. | Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water |
| D. | None of these |
| Answer» D. None of these | |
| 85. |
____________ moderator is used in a fast breeder reactor? |
| A. | Graphite |
| B. | Heavy water |
| C. | Beryllium |
| D. | No |
| Answer» E. | |
| 86. |
Moderating material used in a thermal-reactor should be a ____________________? |
| A. | Good absorber of neutrons |
| B. | Solid substance |
| C. | Poor absorber of neutrons |
| D. | None of these |
| Answer» D. None of these | |
| 87. |
Mass of a positron is same as that of a/an__________________? |
| A. | Electron |
| B. | α-particle |
| C. | Proton |
| D. | Neutron |
| Answer» B. α-particle | |
| 88. |
Main source of ______________ is monazite sand? |
| A. | Uranium |
| B. | Polonium |
| C. | Hafnium |
| D. | Thorium |
| Answer» E. | |
| 89. |
Liquid metal (e.g., molten sodium) is preferred as a coolant in case of a/an ______________ reactor? |
| A. | Homogeneous |
| B. | Graphite moderated |
| C. | Fast breeder |
| D. | Enriched uranium (3% U-235) fuelled |
| Answer» D. Enriched uranium (3% U-235) fuelled | |
| 90. |
‘Light water’ used as a coolant in nuclear reactor is nothing but______________________? |
| A. | Ordinary water |
| B. | Mildly acidic (pH = 6) water |
| C. | Mildly alkaline (pH = 8) water |
| D. | None of these |
| Answer» B. Mildly acidic (pH = 6) water | |
| 91. |
Isotopes of an element have the same__________________? |
| A. | Number of neutrons |
| B. | Mass number |
| C. | Electronic configuration |
| D. | Atomic weight |
| Answer» D. Atomic weight | |
| 92. |
Isotopes of an element have different_________________? |
| A. | Mass number |
| B. | Electronic configuration |
| C. | Nuclear charge |
| D. | Chemical properties |
| Answer» B. Electronic configuration | |
| 93. |
Isotopes of an element have different_____________________? |
| A. | Mass number |
| B. | Electronic configuration |
| C. | Nuclear charge |
| D. | Chemical properties |
| Answer» B. Electronic configuration | |
| 94. |
In the nuclear reaction, 93N239→ 94Pu239 + ?; the missing particle is a/an__________________? |
| A. | Electron |
| B. | Proton |
| C. | Neutron |
| D. | Position |
| Answer» B. Proton | |
| 95. |
In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous ________________? |
| A. | Uranium oxide |
| B. | Uranium hexafluoride |
| C. | Uranium carbide |
| D. | Uranium sulphate |
| Answer» C. Uranium carbide | |
| 96. |
In nuclear reactions, ______________ number is conserved? |
| A. | Mass |
| B. | Atomic |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 97. |
In a pressurised water reactor (PWR), the___________________? |
| A. | Fuel is natural uranium and heavy water acts both as moderator & coolant |
| B. | Coolant water boils in the core of the reactor |
| C. | Coolant water is pressurised to prevent bulk boiling of water in the core |
| D. | Use of moderator is not required |
| Answer» D. Use of moderator is not required | |
| 98. |
In a nuclear explosion, the energy is released primarily in the form of _____________ energy? |
| A. | Potential |
| B. | Thermal |
| C. | Kinetic |
| D. | Electrical |
| Answer» D. Electrical | |
| 99. |
In a homogeneous nuclear reactor, the _____________ are mixed together? |
| A. | Fuel & coolant |
| B. | Fuel & moderator |
| C. | Coolant & moderator |
| D. | None of these |
| Answer» C. Coolant & moderator | |
| 100. |
In β-decay of radioactive material, the ratio of neutron to proton____________________? |
| A. | Increases |
| B. | Remain same |
| C. | Decreases |
| D. | Is unpredictable; may increase or decrease |
| Answer» D. Is unpredictable; may increase or decrease | |