Question 11 : Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
1. less than
2. equal to
3. more than
4. either more or less
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Question 12 : """Critical mass"" is the minimum mass of nuclear fissile material required for the"
1. sustainment of chain reaction.
2. none of these.
3. economic power generation.
4. power generation on commercial scale.
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Question 13 : Fast breeder reactors are most usable in India, because of our largest __________ deposits.
1. thorium
2. none of these
3. plutonium
4. uranium
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Question 14 : Extraction of uranium from its ore is done using __________ methods.
1. physical beneficiation
2. pyrometallurgical
3. electrometallurgical
4. chemical
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Question 15 : The main ore of uranium is
1. pitchblende
2. cassiterite
3. chalcopyrite
4. monazite sand
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Question 16 : The main ore of thorium is
1. monazite sand
2. limonite
3. pitchblende
4. galena
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Question 17 : The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is
1. 3
2. 2
3. 1
4. 4
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Question 18 : Which of the following nuclear materials is fissile ?
1. Thorium-232
2. Plutonium-239
3. None of these
4. Uranium-238
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Question 19 : Atoms of U-238 and U-235 differ in structure by three
1. protons
2. electrons
3. electrons and three protons
4. neutrons
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Question 20 : Main source of __________ is monazite sand.
1. hafnium
2. uranium
3. polonium
4. thorium
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