Question 41 : The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
1. 3300
2. 4400
3. 2200
4. 1100
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Question 42 : __________ moderator is used in a fast breeder reactor.
1. Beryllium
2. Heavy water
3. Graphite
4. No
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Question 43 : The time required for half of the __________ of a radioactive isotope to decay is called its half life.
1. neutrons
2. protons
3. electrons
4. nuclei
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Question 44 : Which one is different for the neutral atoms of the isotopes of an element ?
1. Atomic numbers
2. Atomic weights
3. Number of protons
4. Number of electrons
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Question 45 : Which is a fertile nuclear fuel ?
1. U-233
2. U-235
3. Pu-239
4. Th-232
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Question 46 : Nuclear fuel complex, Hyderabad is engaged in the job of
1. none of these.
2. processing of uranium ore.
3. treatment of spent fuel.
4. manufacture of nuclear fuel elements/assemblies .
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Question 47 : A moderator __________ the neutrons.
1. absorbs
2. slows down
3. accelerates
4. reflects
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Question 48 : Thorium can be converted into U-233 in a __________ reactor.
1. thermal
2. liquid metal cooled
3. fast breeder
4. swimming pool
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Question 49 : Radioactive decay is a __________ change.
1. nuclear
2. chemical
3. physical
4. none of these
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Question 50 : __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
1. Helium cooled
2. Boiling water
3. Molten sodium cooled
4. Pressurised water
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