Question 21 : The first underground nuclear test was conducted by India at
1. Kalpakkam
2. Narora
3. Jaisalmer
4. Pokharan
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Question 22 : A fast breeder reactor employs
1. water as coolant.
2. graphite as moderator.
3. U-235 as fuel.
4. molten sodium as coolant as well as moderator.
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Question 23 : Uranium ore is currently mined & concentrated at
1. Ghatsila
2. Khetri
3. Jadugoda
4. Alwaye
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Question 24 : Fuel for a nuclear reactor (thermal) is
1. none of these
2. uranium
3. plutonium
4. radium
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Question 25 : A radioactive isotope undergoes decay with respect to time following __________ law.
1. logarithmic
2. exponential
3. linear
4. inverse square
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Question 26 : Percentage of U-238 in natural uranium is around
1. 0.71
2. 99.29
3. 0.015
4. 29.71
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Question 27 : Emission of β-particles during radioactive decay of a substance is from
1. nucleus
2. outermost shell
3. none of these
4. innermost shell
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Question 28 : Atoms with same number of neutrons, but different number of nucleons are called
1. isotones
2. isobars
3. isotopes
4. isoters
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Question 29 : Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
1. 45
2. 15
3. 65
4. 85
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Question 30 : Which of the following ores contains maximum percentage of uranium ?
1. Rescolite
2. Thorium
3. Pitchblende
4. Carnotite
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