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| Q. |
Which one among the following is-used as a moderator in nuclear reactors? |
| A. | Ozone |
| B. | Heavy hydrogen |
| C. | Heavy water |
| D. | Hydrogen peroxide |
| Answer» C. Heavy water | |
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Explanation: Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium238. |
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