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1) 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
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2) Thermal nuclear reactors using enriched uranium as fuel contains a maximum of ____________ percent fissile material i.e. U-235? a. 1 b. 2 c. 3 d. 7
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3) The phenomenon of radioactivity was discovered by___________________? a. Madam Curie b. Becquerel c. Roentgen d. J.J. Thomson
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4) First experimental observation of nuclear fission was done by ____________________? a. Plane b. Rutherford c. Fermi d. Hahn and Strassmann
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5) 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
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6) Percentage of heavy water in ordinary water is around__________________? a. 0.015 b. 7.54 c. 0.71 d. 32.97
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7) Atoms with same number of neutrons, but different number of nucleons are called___________________? a. Isotones b. Isobars c. Isotopes d. Isostere
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8) The emission of an a-particle causes the resultant nucleus to have____________________? a. More atomic weight and less atomic number b. Less atomic weight and less atomic number c. Less atomic weight and more atomic number d. None of these
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9) Neutrons have mass approximately equal to that of _____________ atoms? a. Hydrogen b. Helium c. Deuterium d. None of these
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10) Which of the following is artificially produced as it does not occur in nature ? a. Uranium-235 b. Uranium-233 c. Plutonium-239 d. Both B. and C.
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11) Hydrogen differs from deuterium in _____________ properties? a. Radioactive b. Physical c. Chemical d. All A., B. and C.
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12) 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 ? a. A + Z b. A – Z c. A d. Z
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13) 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
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14) The main ore of uranium is ______________________? a. Pitchblende b. Monazite sand c. Cassiterite d. Chalcopyrite
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15) Commercial power generation from fusion reactor is not yet possible, because_____________________? a. It is difficult to control fusion reaction b. The fuel required (e.g. deuterium and tritium) is scarce c. It is difficult to initiate fusion reaction d. Quantity of fuel required for initiating fusion reaction is prohibitively high
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16) A fast breeder reactor____________________? a. Uses natural uranium as fuel b. Does not require a moderator c. Both A. and B. d. Neither A. nor B.
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17) Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around _____________ m/sec? a. 1 b. 2200 c. 3 × 1011 d. 9 × 1021
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18) ____________ moderator is used in a fast breeder reactor? a. Graphite b. Heavy water c. Beryllium d. No
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19) Nuclear fuel usually used in a Boiling Water Reactor (BWR) is__________________? a. Plutonium b. Enriched uranium c. Natural uranium d. Thorium
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20) Atoms of U-238 and U-235 differ in structure by three_____________________? a. Electrons and three protons b. Protons c. Neutrons d. Electrons
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