MCQOPTIONS
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MCQOPTIONS
This section includes 160 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following may be used to measure the rate of nuclear disintegration ? |
| A. | Geiger-Muller Counter |
| B. | Cyclotron |
| C. | Cold chamber |
| D. | Mass spectrograph |
| Answer» B. Cyclotron | |
| 2. |
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. | |
| 3. |
What is the average life of a radioactive atom having a ‘half life period’ of T ? |
| A. | 1.44 T |
| B. | 0.144 T |
| C. | 14.4 T |
| D. | 2T |
| Answer» B. 0.144 T | |
| 4. |
Water is a better coolant than a gas (like CO2, He, N2 etc.), because it_________________? |
| A. | Is a better neutron moderator as well |
| B. | Require 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 A., B. and C. |
| Answer» E. | |
| 5. |
Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around _____________ m/sec? |
| A. | 1 |
| B. | 2200 |
| C. | 3 × 1011 |
| D. | 9 × 1021 |
| Answer» C. 3 × 1011 | |
| 6. |
Use of molten metal as a coolant in fast breeder reactor helps in_________________? |
| A. | Rapid heat transfer from the core |
| B. | Accelerating the reaction rate in the core |
| C. | Breeding neutrons |
| D. | Accelerating the neutrons |
| Answer» B. Accelerating the reaction rate in the core | |
| 7. |
Uranium percentage in monazite sand is about________________? |
| A. | 0.01 |
| B. | 0.25 |
| C. | 1.2 |
| D. | 7 |
| Answer» C. 1.2 | |
| 8. |
Uranium is recovered from its ore (pitchblende) by________________? |
| A. | Froth floatation technique |
| B. | Leaching with sulphuric acid |
| C. | Smelting in a furnace |
| D. | Dissolving in water |
| Answer» C. Smelting in a furnace | |
| 9. |
Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at_______________? |
| A. | Alwaye (in Kerala) |
| B. | Jadugoda (in Jharkhand) |
| C. | Kalpakkam (in Tamilnadu) |
| D. | Gopalpur coast (in Orissa) |
| Answer» C. Kalpakkam (in Tamilnadu) | |
| 10. |
Unit of radioactivity is__________________? |
| A. | Barn |
| B. | Fermi |
| C. | Angstrom |
| D. | Curie |
| Answer» E. | |
| 11. |
Unit of radioactivity is_________________? |
| A. | Barn |
| B. | Fermi |
| C. | Angstrom |
| D. | Curie |
| Answer» E. | |
| 12. |
U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about _____________ percent? |
| A. | 85 |
| B. | 50 |
| C. | 3 |
| D. | 97 |
| Answer» D. 97 | |
| 13. |
Thorium metal__________________? |
| A. | Resembles steel in appearance |
| B. | Is less hard (in the range of silver) |
| C. | Is highly ductile |
| D. | All A., B. and C. |
| Answer» E. | |
| 14. |
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 | |
| 15. |
Thorium-232 (a fertile material) on absorption of a neutron gets converted into ___________ , which is a fissile material? |
| A. | Thorium-233 |
| B. | Uranium-235 |
| C. | Uranium-233 |
| D. | Plutonium-239 |
| Answer» D. Plutonium-239 | |
| 16. |
Thorium can be converted into U-233 in a _____________ reactor? |
| A. | Liquid metal cooled |
| B. | Fast breeder |
| C. | Thermal |
| D. | Swimming pool |
| Answer» C. Thermal | |
| 17. |
Thermal shield is used in high powered nuclear reactors to__________________? |
| A. | Protect the walls of the reactor from radiation damage |
| B. | Absorb the fast neutrons |
| C. | Slow down the secondary neutrons |
| D. | Protect the fuel element from coming in contact with the coolant |
| Answer» B. Absorb the fast neutrons | |
| 18. |
Thermal neutrons which are used to cause the fission of U-235 have energy _____________ eV? |
| A. | < 0.025 |
| B. | > 1 |
| C. | 1-25 |
| D. | > 200 |
| Answer» B. > 1 | |
| 19. |
Thermal nuclear reactors using enriched uranium as fuel contains a maximum of ____________ percent fissile material i.e. U-235? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 7 |
| Answer» D. 7 | |
| 20. |
The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second? |
| A. | 1100 |
| B. | 2200 |
| C. | 3300 |
| D. | 4400 |
| Answer» C. 3300 | |
| 21. |
The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is_____________________? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | Much more |
| Answer» B. More | |
| 22. |
The size of an atom is of the order of one __________________? |
| A. | °Angstrom |
| B. | Fermi |
| C. | Micron |
| D. | mm |
| Answer» B. Fermi | |
| 23. |
The ratio of volume of an atom to that of its nucleus is__________________? |
| A. | 1012 |
| B. | 10-12 |
| C. | 10-8 |
| D. | 108 |
| Answer» B. 10-12 | |
| 24. |
The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________? |
| A. | 1 |
| B. | 0.5 |
| C. | 2 |
| D. | 4 |
| Answer» B. 0.5 | |
| 25. |
The ratio of atomic radius to its nuclear radius is about___________________? |
| A. | 105 |
| B. | 108 |
| C. | 1012 |
| D. | 1015 |
| Answer» B. 108 | |
| 26. |
The radioisotope used to study the thyroid gland is__________________? |
| A. | Iodine |
| B. | Cobalt |
| C. | Iron |
| D. | Carbon |
| Answer» B. Cobalt | |
| 27. |
The phenomenon of radioactivity was discovered by___________________? |
| A. | Madam Curie |
| B. | Becquerel |
| C. | Roentgen |
| D. | J.J. Thomson |
| Answer» C. Roentgen | |
| 28. |
The phenomenon of nuclear fission is opposite to that of__________________? |
| A. | Radioactive decay |
| B. | Thermionic emission |
| C. | Nuclear fusion |
| D. | Combustion |
| Answer» D. Combustion | |
| 29. |
The number of neutrons in the nucleus of Uranium-233 (92U233) is _________________? |
| A. | 141 |
| B. | 92 |
| C. | 233 |
| D. | 325 |
| Answer» B. 92 | |
| 30. |
The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 31. |
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 | |
| 32. |
The most commonly used nuclear fuel in boiling water reactor is___________________? |
| A. | Enriched uranium |
| B. | Natural uranium |
| C. | Plutonium |
| D. | Monazite sand |
| Answer» B. Natural uranium | |
| 33. |
The most abundant isotope of natural uranium is ___________________? |
| A. | 92U238 |
| B. | 92U235 |
| C. | 92U234 |
| D. | None of these |
| Answer» B. 92U235 | |
| 34. |
The molecular weight of heavy water is_________________? |
| A. | 10 |
| B. | 18 |
| C. | 20 |
| D. | 36 |
| Answer» D. 36 | |
| 35. |
The mass number of an element is not changed, when it emits _______________ radiations? |
| A. | α & β |
| B. | β & γ |
| C. | γ & α |
| D. | α, β, & γ |
| Answer» C. γ & α | |
| 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. |
The main purpose of control rod in a nuclear reactor is to control the___________________? |
| A. | Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission |
| B. | Emission of hazardous radiation |
| C. | Conversion of fissile material into fertile material |
| D. | Velocity of the secondary neutrons |
| Answer» B. Emission of hazardous radiation | |
| 38. |
The main ore of uranium is ______________________? |
| A. | Pitchblende |
| B. | Monazite sand |
| C. | Cassiterite |
| D. | Chalcopyrite |
| Answer» B. Monazite sand | |
| 39. |
The main ore of thorium is_________________? |
| A. | Pitchblende |
| B. | Monazite sand |
| C. | Limonite |
| D. | Galena |
| Answer» C. Limonite | |
| 40. |
The largest stable nucleus is ________________? |
| A. | U-235 |
| B. | U-238 |
| C. | Pb-206 |
| D. | Bi-209 |
| Answer» B. U-238 | |
| 41. |
The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to ______________ gm? |
| A. | 1/4 |
| B. | 1/8 |
| C. | 1/2 |
| D. | 1/16 |
| Answer» E. | |
| 42. |
The half life period of a radioactive element depends on its _______________________? |
| A. | Temperature |
| B. | Pressure |
| C. | Amount |
| D. | None of these |
| Answer» E. | |
| 43. |
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. | 1/8th of it will remain intact at the end of four months |
| Answer» C. It will completely disintegrate in four months | |
| 44. |
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. | |
| 45. |
The function of moderators in nuclear reactor is to _________________? |
| A. | Slow down the secondary neutrons |
| B. | Absorb the secondary neutrons |
| C. | Control the chain reaction |
| D. | None of these |
| Answer» B. Absorb the secondary neutrons | |
| 46. |
The emission of an a-particle causes the resultant nucleus to have____________________? |
| A. | More atomic weight and less atomic number |
| B. | Less atomic weight and less atomic number |
| C. | Less atomic weight and more atomic number |
| D. | None of these |
| Answer» B. Less atomic weight and less atomic number | |
| 47. |
The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the________________? |
| A. | Fuel cost per unit power generated is less |
| B. | Thermal efficiency of the former is higher |
| C. | Maintenance cost of the former is less |
| D. | None of these |
| Answer» B. Thermal efficiency of the former is higher | |
| 48. |
The disintegration rate of a radioactive element _______________? |
| A. | Progressively increases |
| B. | Progressively decreases |
| C. | Remains constant throughout |
| D. | May increase or decrease depending on the material |
| Answer» C. Remains constant throughout | |
| 49. |
The decrease in the atomic number is not observed in case of________________? |
| A. | Electron capture |
| B. | β-emission |
| C. | α-emission |
| D. | Positron emission |
| Answer» C. α-emission | |
| 50. |
The decay product of tritium (a beta emitter) is_________________? |
| A. | Lithium |
| B. | Helium |
| C. | Deuterium |
| D. | Hydrogen |
| Answer» C. Deuterium | |