Question 91 : A series of radioactive fissions is called a?
1. Fission Row
2. Fission Chain
3. Fission Column
4. None of the mentioned
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Question 92 : The amount of a radioactive material (having a half-life of 100 years) remaining after 400 years will be __________ of its original weight.
1. 0.5
2. 0.25
3. 1/8
4. 1/16
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Question 93 : The half-life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.
1. 1/2
2. 1/4
3. 1/8
4. 1/16
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Question 94 : The mass number of an element is not changed, when it emits __________ radiations.
1. α & γ
2. α, β, & γ
3. α & β
4. β & γ
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Question 95 : Fast breeder reactors are most usable in India, because of our largest __________ deposits.
1. Uranium
2. Plutonium
3. Thorium
4. None of the mentioned
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Question 96 : Thermal shield is used in high powered nuclear reactors to
1. absorb the fast neutrons
2. protect the walls of the reactor from radiation damage
3. slow down the secondary neutrons
4. protect the fuel element from coming in contact with the coolant
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Question 97 : A boiling water reactor is the one, in which the
1. pressurised water is pumped into the core.
2. coolant water, after being heated in the reactor core, generates steam in a boiler
3. fuel and the coolant are thoroughly mixed to form a homogeneous solution
4. coolant water is allowed to boil in the core of the reactor
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Question 98 : Extraction of uranium from its ore is done using __________ methods.
1. chemical
2. pyrometallurgical
3. electrometallurgical
4. physical benefaction
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Question 99 : Heat is generated in a nuclear reactor (thermal) by
1. fusion of atoms of uranium
2. absorption of neutrons in uranium atoms
3. combustion of nuclear fuel
4. fission of U-235 by neutrons
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