MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it |
| A. | Is a better neutron moderator as well |
| B. | Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate |
| C. | Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature |
| D. | All of the above |
| Answer» E. | |
| 2. |
Which of the following is a fuel for a fusion reactor (thermonuclear reactor)? |
| A. | Deuterium and tritium |
| B. | U-233 |
| C. | Thorium |
| D. | Heavy water |
| Answer» B. U-233 | |
| 3. |
The half life period of a radioactive element depends upon the |
| A. | Temperature |
| B. | Pressure |
| C. | Amount of element present |
| D. | None of these |
| Answer» E. | |
| 4. |
Which of the following is not used as a nuclear fuel cladding material? |
| A. | Zircalloy |
| B. | Cadmium |
| C. | Ceramics |
| D. | Stainless steel |
| Answer» C. Ceramics | |
| 5. |
Which is a fertile nuclear fuel? |
| A. | U-233 |
| B. | U-235 |
| C. | Pu-239 |
| D. | Th-232 |
| Answer» E. | |
| 6. |
Which of the following ores contains maximum percentage of uranium? |
| A. | Carnotite |
| B. | Thorium |
| C. | Rescolite |
| D. | Pitchblende |
| Answer» E. | |
| 7. |
Thorium⁻²32 is converted into uranium⁻²33 in a/an __________ nuclear reactor. |
| A. | Thermal |
| B. | Fast breeder |
| C. | Heavy water moderated |
| D. | Enriched uranium |
| Answer» C. Heavy water moderated | |
| 8. |
β-rays emission in radioactive disintegration is always accompanied by the emission of |
| A. | γ-rays |
| B. | α-rays |
| C. | Neutrons |
| D. | None of these |
| Answer» B. α-rays | |
| 9. |
Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 10¹³ to 10¹⁴ neutrons/cm² second. |
| A. | Research |
| B. | Power |
| C. | Breeder |
| D. | Homogeneous |
| Answer» B. Power | |
| 10. |
Nucleus of 92U235 contains __________ protons. |
| A. | 92 |
| B. | 235 |
| C. | 143 |
| D. | 325 |
| Answer» B. 235 | |
| 11. |
The 92U238 emits an a-particle. The product is |
| A. | 90U234 |
| B. | 90U238 |
| C. | 90U236 |
| D. | 92U236 |
| Answer» B. 90U238 | |
| 12. |
Heavy water (D₂O) in a nuclear reactor serves as a |
| A. | Coolant |
| B. | Moderator |
| C. | Both A & B |
| D. | Neutron absorber |
| Answer» D. Neutron absorber | |
| 13. |
The new nucleus formed after β-decay of a radioactive element has~! |
| A. | Less atomic number |
| B. | Less atomic weight |
| C. | More atomic number |
| D. | More atomic weight |
| Answer» B. Less atomic weight | |
| 14. |
Pressure of CO₂ gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm² .%! |
| A. | 0.2 |
| B. | 7 |
| C. | 35 |
| D. | 50 |
| Answer» B. 7 | |
| 15. |
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.%! |
| A. | 3.125 |
| B. | 6.25 |
| C. | 12.50 |
| D. | 25 |
| Answer» C. 12.50 | |
| 16. |
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then%! |
| A. | 3/4th of it will disintegrate in two months |
| B. | It will completely disintegrate in two months |
| C. | It will completely disintegrate in four months |
| D. | L/8th of it will remain intact at the end of four months |
| Answer» C. It will completely disintegrate in four months | |
| 17. |
Emission of β-particles during radioactive decay of a substance is from%! |
| A. | Innermost shell |
| B. | Nucleus |
| C. | Outermost shell |
| D. | None of these |
| Answer» C. Outermost shell | |
| 18. |
Which of the following is not used as a nuclear fuel cladding material?%! |
| A. | Zircalloy |
| B. | Cadmium |
| C. | Ceramics |
| D. | Stainless steel |
| Answer» C. Ceramics | |
| 19. |
Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has%! |
| A. | Five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva) |
| B. | A 420 MW nuclear power plant |
| C. | A very large capacity (100 tons/yr) heavy water plant |
| D. | All of the above |
| Answer» B. A 420 MW nuclear power plant | |
| 20. |
Fast breeder reactors do not%! |
| A. | Use Th-232 as fissile fuel |
| B. | Convert fertile material to fissile material |
| C. | Use fast neutrons for fission |
| D. | Use molten sodium as coolant |
| Answer» B. Convert fertile material to fissile material | |
| 21. |
Which of the following may not need a control rod?%! |
| A. | Liquid metal cooled reactor |
| B. | Fast breeder reactor |
| C. | Candu reactor |
| D. | None of these |
| Answer» E. | |
| 22. |
Out of the following, nucleus of __________ atom contains the largest number of neutrons.%! |
| A. | U-235 |
| B. | U-238 |
| C. | U-239 |
| D. | Pu-239 |
| Answer» D. Pu-239 | |
| 23. |
Fission of U-235 on slow neutron bombardment can be represented by%! |
| A. | 92U235 + 0n1 ‚Üí 56Ba143 + 36Kr90 |
| B. | 92U235 + 0n1 ‚Üí 56Ba143 + 36Kr90 + 3 0n1 |
| C. | 92U235 + 0n1 ‚Üí 56Ba143 + 36Kr90 + 3 0n1 + Q (energy) |
| D. | 92U235 + 0n1 ‚Üí 92U236 + 3 0n1+ Q (energy) |
| Answer» D. 92U235 + 0n1 ‚Äö√ú√≠ 92U236 + 3 0n1+ Q (energy) | |
| 24. |
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is%! |
| A. | 3 |
| B. | 235 |
| C. | 200 |
| D. | 92 |
| Answer» B. 235 | |
| 25. |
Percentage of heavy water in ordinary water is around%! |
| A. | 0.015 |
| B. | 7.54 |
| C. | 0.71 |
| D. | 32.97 |
| Answer» B. 7.54 | |
| 26. |
Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor?%! |
| A. | Molten sodium cooled |
| B. | CO‚ÇÇ gas cooled |
| C. | Pressurised water |
| D. | Boiling water |
| Answer» E. | |
| 27. |
Nuclides having the same atomic numbers are termed as%! |
| A. | Isotopes |
| B. | Isomers |
| C. | Isotones |
| D. | Isobars |
| Answer» C. Isotones | |
| 28. |
Heavy water used in the nuclear reactors to slow down the speed of neutrons is%! |
| A. | Highly purified water |
| B. | A compound of oxygen and deuterium |
| C. | Water having dissolved salts of heavy metals |
| D. | None of these |
| Answer» C. Water having dissolved salts of heavy metals | |
| 29. |
The atomic number of an element is equal to the number of __________ present in its atom.%! |
| A. | Neutrons |
| B. | Electrons |
| C. | Protons |
| D. | Either B or C |
| Answer» E. | |
| 30. |
Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 10¹³ to 10¹⁴ neutrons/cm² second.%! |
| A. | Research |
| B. | Power |
| C. | Breeder |
| D. | Homogeneous |
| Answer» B. Power | |
| 31. |
A control rod%! |
| A. | Should have small absorption cross-section |
| B. | Is generally made of boron, hafnium or cadmium |
| C. | Should have large absorption cross-section |
| D. | Both B and C |
| Answer» E. | |
| 32. |
A radioactive substance does not emit%! |
| A. | Α-ray |
| B. | Proton |
| C. | Position |
| D. | Β-ray |
| Answer» C. Position | |
| 33. |
Fast breeder test reactor at Kalpakkam is designed for using%! |
| A. | Thorium as a fertile material |
| B. | U-238 as a fertile material |
| C. | Helium as a coolant |
| D. | Uranium ore directly as a fuel |
| Answer» B. U-238 as a fertile material | |
| 34. |
The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.%! |
| A. | 24 |
| B. | 18 |
| C. | 6 |
| D. | 36 |
| Answer» C. 6 | |
| 35. |
Graphite is used in nuclear reactor as%! |
| A. | Insulation lining of the reactor |
| B. | Fuel |
| C. | Lubricant |
| D. | Retarder of neutron velocity |
| Answer» E. | |
| 36. |
The mass number of an element is equal to the number of __________ in the nucleus.%! |
| A. | Electrons |
| B. | Neutrons |
| C. | Protons |
| D. | Neutrons plus protons (i.e., nucleons) |
| Answer» E. | |
| 37. |
When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as%! |
| A. | Isomers |
| B. | Isotopes |
| C. | Isobars |
| D. | Isotones |
| Answer» E. | |
| 38. |
The radioisotope used to study the thyroid gland is%! |
| A. | Iodine |
| B. | Cobalt |
| C. | Iron |
| D. | Carbon |
| Answer» B. Cobalt | |
| 39. |
Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.%! |
| A. | U-238 |
| B. | U-233 |
| C. | U-235 |
| D. | Pu-239 |
| Answer» D. Pu-239 | |
| 40. |
*$_A control rod? |
| A. | Should have small absorption cross-section |
| B. | Is generally made of boron, hafnium or cadmium |
| C. | Should have large absorption cross-section |
| D. | Both B and C |
| Answer» E. | |
| 41. |
*$_Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor?? |
| A. | Molten sodium cooled |
| B. | CO‚ÇÇ gas cooled |
| C. | Pressurised water |
| D. | Boiling water |
| Answer» E. | |
| 42. |
*$_Percentage of heavy water in ordinary water is around? |
| A. | 0.015 |
| B. | 7.54 |
| C. | 0.71 |
| D. | 32.97 |
| Answer» B. 7.54 | |
| 43. |
*$_Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has? |
| A. | Five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva) |
| B. | A 420 MW nuclear power plant |
| C. | A very large capacity (100 tons/yr) heavy water plant |
| D. | All of the above |
| Answer» B. A 420 MW nuclear power plant | |
| 44. |
*$_Nuclides having the same atomic numbers are termed as? |
| A. | Isotopes |
| B. | Isomers |
| C. | Isotones |
| D. | Isobars |
| Answer» C. Isotones | |
| 45. |
*$_Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is? |
| A. | 3 |
| B. | 235 |
| C. | 200 |
| D. | 92 |
| Answer» B. 235 | |
| 46. |
*$_Which of the following is not used as a nuclear fuel cladding material?? |
| A. | Zircalloy |
| B. | Cadmium |
| C. | Ceramics |
| D. | Stainless steel |
| Answer» C. Ceramics | |
| 47. |
*$_Fission of U-235 on slow neutron bombardment can be represented by? |
| A. | 92U235 + 0n1 ‚Üí 56Ba143 + 36Kr90 |
| B. | 92U235 + 0n1 ‚Üí 56Ba143 + 36Kr90 + 3 0n1 |
| C. | 92U235 + 0n1 ‚Üí 56Ba143 + 36Kr90 + 3 0n1 + Q (energy) |
| D. | 92U235 + 0n1 ‚Üí 92U236 + 3 0n1+ Q (energy) |
| Answer» D. 92U235 + 0n1 ‚Äö√ú√≠ 92U236 + 3 0n1+ Q (energy) | |
| 48. |
*/*_Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.? |
| A. | U-238 |
| B. | U-233 |
| C. | U-235 |
| D. | Pu-239 |
| Answer» D. Pu-239 | |
| 49. |
*/*_Heavy water plant is not located at? |
| A. | Kota and Baroda |
| B. | Talcher (Orissa) |
| C. | Tuticorin(Tamilnadu) |
| D. | Korba |
| Answer» E. | |
| 50. |
*/*_The radioisotope used to study the thyroid gland is? |
| A. | Iodine |
| B. | Cobalt |
| C. | Iron |
| D. | Carbon |
| Answer» B. Cobalt | |