21. Fast breeder reactors are most usable in India, because of our largest . . . . . . . . deposits.
22. Graphite is used in nuclear reactor as
23. Heavy water (D2O) in a nuclear reactor serves as a
24. Match List I (Material) with List II (Use) and select the correct answer:
List-I (Material)
List-II (Use)
P. Graphite
1. Coolant
Q. Thorium-233
2. Moderator
R. Molten sodium
3. Fissionable material
S. Plutonium-239
4. Fissile material
| List-I (Material) | List-II (Use) |
| P. Graphite | 1. Coolant |
| Q. Thorium-233 | 2. Moderator |
| R. Molten sodium | 3. Fissionable material |
| S. Plutonium-239 | 4. Fissile material |
25. Which of the following is artificially produced, as it does not occur in nature?
26. Positron is a/an
27. The most abundant isotope of natural uranium is
28. Which of the following nuclear materials is fissile?
29. Uranium is recovered from its ore (Pitchblende) by
30. Out of the following places, heavy water plant is not located at
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