Question 81 : Which is radioactive in nature?
1. Helium
2. Deuterium
3. Tritium
4. Heavy Hydrogen
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Question 82 : Percentage of U-238 in natural uranium is around
1. 29.71
2. 99.29
3. 0.015
4. 0.71
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Question 83 : An electron has a mass that is approximately __________ that of the proton.
1. 1/1836
2. 1
3. 1836
4. none of the mentioned
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Question 84 : The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is
1. 4
2. 3
3. 2
4. 1
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Question 85 : Main source of __________ is monazite sand
1. Uranium
2. Polonium
3. Halfnium
4. Thorium
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Question 86 : Radioactive decay is a ________ change.
1. Physical
2. Chemical
3. Nuclear
4. None of the mentioned
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Question 87 : Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
1. 1
2. 2
3. 3
4. 6
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Question 88 : Gas cooling as compared to water cooling of nuclear reactors
1. cannot attain a high temperature
2. is more efficient as gas has a higher specific heat.
3. can produce only saturated steam for feeding to power turbine
4. none of the mentioned
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Question 89 : __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
1. pressurised water
2. boiling water
3. helium cooled
4. molten sodium cooled
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Question 90 : The most commonly used nuclear fuel in boiling water reactor is
1. enriched uranium
2. plutonium
3. natural uranium
4. monazite sand
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