- 1(current)
Q. No.In a nuclear reactor, moderators slow down the neutrons which come out in a fission process. The moderator used have light nuclei. Heavy nuclei will not serve the purpose, because:
| 1. | they will break up |
| 2. | elastic collision of neutrons with heavy nuclei will not slow them down |
| 3. | the net weight of the reactor would be unbearably high |
| 4. | substances with heavy nuclei do not occur in the liquid or gaseous state at room temperature |
Subtopic: Nuclear Energy |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFusion processes, like combining two deuterons to form a \(\mathrm{He}\)-nucleus are impossible at ordinary temperatures and pressure. The reasons for this can be traced to the fact:
Choose the correct option:
1. (a), (c)
2. (a), (d)
3. (b), (d)
4. (a), (b)
| (a) | nuclear forces have short-range. |
| (b) | nuclei are positively charged. |
| (c) | the original nuclei must be completely ionized before fusion can take place. |
| (d) | the original nuclei must first break up before combining with each other. |
Choose the correct option:
1. (a), (c)
2. (a), (d)
3. (b), (d)
4. (a), (b)
From NCERT
Subtopic: Nuclear Energy |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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