11. Ordinary water is not used as a moderator, because it
12. Thorium-232 (a fertile material) on absorption of a neutron gets converted into . . . . . . . . which is a fissile material.
13. Which of the following does not need a moderator?
14. Match List I and List II and select the correct answer:
List-I
List-II
P. Prepared fuel
1. Uranium-235
Q. Primary fuel
2. Graphite
R. moderator
3. Uranium-233
S. Control rod
4. Cadniium
| List-I | List-II |
| P. Prepared fuel | 1. Uranium-235 |
| Q. Primary fuel | 2. Graphite |
| R. moderator | 3. Uranium-233 |
| S. Control rod | 4. Cadniium |
15. Main source of . . . . . . . . is monozite sand.
16. Thermal shield is used in high powered nuclear reactors to
17. Commercial power generation for fusion reactor is not yet possible, because
18. Safety rod provided in nuclear reactors to guard against accident in case of earthquake is made of
19. Which of the following undergoes fission reaction easily?
20. Thermal nuclear reactors using 'enriched uranium' as fuel contain a maximum of . . . . . . . . percent fissile material i.e., U-235.
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