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Which of the following particles is the lightest?

A. Nucleus

B. Electron

C. Proton

D. Meson

Correct Answer : B.


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  1. A power plant giving least running cost of production of electrical power is
  2. Hydrogen is preferred as better coolant in comparison to CO₂ because former
  3. In triggering fission, the following types of neutrons are desirable
  4. In triggering fission, which types of neutrons are more effective?
  5. Which of the following are ferrite materials?
  6. In natural uranium, the constituents of three naturally occuring isotopes are
  7. Artificial radioactive isotopes find application in
  8. Plutonium (Pu239) is produced
  9. Pressurised water reactor is designed
  10. A moderator
  11. Which of the following statement is correct regarding the features of a Breeder reactor?
  12. Boiling water reactor employs
  13. The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration…
  14. The size of the reactor is said to be critical when
  15. Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and…
  16. Breeder reactors employ liquid metal coolant because it
  17. The process by which a heavy nucleus is spitted into two light nuclei is known as
  18. The secondary fuel used in nuclear power plants is
  19. In fast breeder reactors
  20. Amongst the following, the fissionable materials are
  21. When a reactor becomes critical, then the production of neutrons is
  22. The most commonly used moderator in nuclear plants is
  23. Moderator in nuclear plants is used to
  24. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the…
  25. Breeder reactor has a conversion ratio of
  26. In a thermal power plant, coal from the coal handling plant is moved to the boiler bunker through a
  27. In boiling water reactor, moderator is
  28. U₂₃₃ is produced
  29. U238 will undergo fission by
  30. The energy released during the fission of one atom of Uranium 235 in million electron volts is about