Question 51 : Which of the following nuclear materials is fissile?
1. U-239
2. U-235
3. U-232
4. Pu-239
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Question 52 : Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is
1. 2
2. 1
3. 0.1
4. 12
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Question 53 : The nuclear activity occurring in the radioisotope Xenon 135 is?
1. Alpha & Beta emission
2. Gamma & Beta Emission
3. Beta emission
4. None of the mentioned
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Question 54 : The main ore of uranium is
1. cassiterite
2. chalcopyrite
3. pitchblende
4. monazite sand
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Question 55 : Which of the following may be used to measure the rate of nuclear disintegration?
1. Geiger-Muller Counter
2. Cold Chamber
3. Cyclotron
4. Van De Graph Generator
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Question 56 : 1 Curie =
1. 3.615 x 10¹⁰ dis/s
2. 3.615 x 10^0.7 dis.s
3. 3.615 x 10¹² dis
4. 3.615 x 10 dis/s
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Question 57 : A fast breeder reactor employs
1. U-235 as a fuel
2. water as a coolant
3. graphite as a moderator
4. none of the mentioned
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Question 58 : The second underground nuclear test was conducted by India at
1. Pokhran
2. Narora
3. Jaisalmer
4. Kalpakkam
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Question 59 : First experimental observation of nuclear fission was done by
1. Rutherford
2. Hahn & Strassman
3. Plane
4. Fermi
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Question 60 : Uranium ore is currently mined & concentrated at
1. Khetri
2. Alwaye
3. Ghatsilla
4. Jadugoda
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