nuclear power plants Mcqs
1. Which is not identical for an atom and an isotope_________________?
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A. atomic number

B. all of the above

C. position in periodic table

D. chemical properties

E. mass number
2. Reflector in nuclear plants is used to________________?
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A. conserve energy

B. is not used

C. return the neutrons back into the core

D. shield the radioactivity completely

E. check polllution

3. Gas cooled reactor uses following materials as moderator, and coolant____________________?
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A. concrete, N2

B. heavy water, C02

C. graphite, C02

D. lead, H2

E. graphite, air

4. Isotopes of same elements have___________________?
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A. same chemical properties but different atomic numbers

B. same chemical properties and same atomic numbers

C. same atomic number and different masses

D. different chemical properties and same atomic numbers

E. different masses and different atomic numbers

5. Hydrogen is preferred as better coolant in comparison to C02 because former_____________________?
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A. is a good conductor

B. has high specific heat

C. is lighter

D. is inert

E. all of the above

6. In nuclear fission each neutron that causes fission releases_______________?
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A. more than one new neutrons

B. no new neutron

C. one new neutron

D. many-fold neutrons

E. at least one new neutron

7. Enriched uranium is one in which__________________?
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A. all impurities have been removed

B. extra energy is pumped from outside

C. %age of U235 has been artificially in-creased

D. %age of U has been artificially increased

E. %age of U234 has been artificially in-creased

8. Which of the following particles is the lightest__________________?
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A. neutron

B. meson

C. proton

D. electron

E. nucleus

9. Boiling water reactor employs__________________?
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A. double circuit system of coolant cycle

B. single circuit system

C. multi pass system

D. direct cycle of coolant system

E. boiler

10. Which of the following nuclear reactor does not need a heat exchanger for generation of steam____________________?
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A. gas cooled

B. pressurised water

C. liquid metal cooled

D. none of the above

E. boiling water
11. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is________________?
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A. more

B. same

C. may be less or mote depending on size

D. unpredictable

E. less
12. The first unclear power plant in India is located at____________________?
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A. Kota

B. Tarapur

C. Baraeilly

D. Kalapakkam

E. Kerala

13. The nuclear energy is measured as__________________?
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A. MW

B. MeV

C. curie

D. kWhr

E. farads

14. Atomic number of an element in the periodic table represents the numbers of_________________?
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A. neutrons in the nucleus

B. electrons in the atom

C. protons in the nucleus

D. electrons in me nucleus

E. neutrons in the atom

15. The total energy released in fission of U is__________________?
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A. 10 MeV

B. 199 MeV

C. 11 MeV

D. 168 MeV

E. 5 MeV

16. The main interest of shielding in nuclear reactor is protection against_______________?
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A. neutrons and gamma rays

B. X-rays

C. infra-red rays

D. a, P, and y rays

E. electrons

17. Fast breeder reactor uses___________________?
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A. single circuit system

B. boiler

C. direct cycle of coolant system

D. multi pass system

E. double circuit system of coolant cycle
18. A nuclear unit becoming critical means_______________?
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A. it is capable of generating much more than rated capacity

B. it is generating power to rated capacity

C. chain reaction that causes automatic splitting of the fuel nuclei has been established

D. there is danger of nuclear spread

E. it generates no heat

19. Ferrite material is____________________?
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A. the basic fuel for nuclear paints

B. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

C. basic raw material for nuclear plants

D. the most fissionable material

E. none of the above

20. Boiling water reactor uses the following as moderator, coolant and working fluid________________?
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A. ordinary fluid

B. heavy water

C. hydrogen gas

D. molten lead

E. none of the above

21. The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
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A. chain reaction

B. disintegration

C. fusion

D. splitting

E. fission
22. Amongst the following, the fissionable materials are________________?
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A. U233andPu239

B. U235andPu235

C. U23iandPu233

D. U243andPu235

E. U238andPu239

23. The fast breeder reactor uses the following moderator__________________?
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A. graphite

B. carbon dioxide

C. demineralised water

D. no moderator is used

E. heavy water

24. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
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A. there is no such criterion

B. none of the above

C. less

D. same

E. more
25. In fast breeder reactors___________________?
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A. heavy water is used as the moderator

B. moderator may or may not be used

C. graphite is used as the moderator

D. any type of moderator can be used

E. moderator is dispensed with
26. Breeder reactor has a conversion ratio of_____________________?
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A. less than unity

B. zero

C. infinity

D. unity

E. more than unity
27. Which of the following is the heaviest________________?
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A. neutron

B. atom

C. electron

D. nucleus

E. proton

28. The number of isotopes of hydrogen are _________________?
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A. 2

B. 3

C. 0

D. 1

E. U

29. U238 will undergo fission by_________________?
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A. high energy (fast) neutrons alone

B. none of the above

C. medium energy neutrons

D. either fast or slow neutrons

E. low energy (slow) neutrons alone

30. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?
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A. same

B. unity

C. lower

D. higher/lower depending on the size of reactor

E. higher

31. One gram of uranium will produce energy equivalent to approximately____________________?
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A. 100 tonnes of high grade coal

B. 1000 tonnes of high grade coal

C. 1 tonne of high grade coal

D. 10 tonnes of high grade coal

E. 4.5 tonnes of high grade coal
32. The most commonly used moderator in nuclear plants is___________________?
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A. deutrium

B. graphite

C. graphite and concrete

D. concrete and bricks

E. heavy water

33. The mass number of a substance represents the sum of total number of___________________?
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A. protons and electrons in a nucleus

B. protons and neutrons in a nucleus

C. neutrons and electrons in an atom

D. protons and neutrons in an atom

E. protons and electrons in an atom

34. The commonly used material for shielding is__________________?
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A. thick galvanised sheets

B. graphite or cadmium

C. lead or concrete

D. black carbon papers

E. lead and tin

35. A nuclear fission produces energy of following order in MeV___________________?
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A. 20

B. 200

C. 20,000

D. 2000

E. 2 x 105

36. Moderator in nuclear plants is used to__________________?
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A. reduce temperature

B. moderate the radioactive pollution

C. control the reaction

D. extract heat from nuclear reaction

E. cause collision with the fast moving neutrons to reduce their speed
37. The energy required to be applied to a radioactive nucleus for the emission of a neutron is________________?
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A. 1 MeV

B. 4.3 MeV

C. 20 MeV

D. 7.8 MeV

E. 2.4 MeV

38. Which of the following are ferrite materials__________________?
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A. U233andPu239

B. U

C. U238andTh239

D. none of the above

E. U238andPu239

39. Ideally the neutron flux in reactor should be__________________ ?
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A. uniform throughout

B. maximum in center and zero at side

C. maximum at side and zero in center

D. zero throughout

E. none of the above

40. The nuclear power plant at Tarapur has the following reactor________________?
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A. pressurised water

B. fast breeder

C. sodium graphite

D. none of the above

E. boiling water
41. U235 will undergo fission by__________________?
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A. either fast or slow neutrons

B. low energy (slow) neutrons alone

C. high energy (fast) neutrons alone

D. none of the above

E. medium energy neutrons

42. Half life of a radioactive isotope corresponds to the time required for half of the following to decay__________________?
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A. protons

B. electrons

C. neutrons

D. nulceus

E. atom
43. A fission chain reaction in uranium can be developed by________________?
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A. using moderator

B. absorbing all neutrons

C. slowing down fast neutrons so that Uz fission continues by slow motion neutrons

D. accelerating fast neutrons

E. enriching U235

44. Plutonium is produced________________?
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A. by neutron irradiation of Uz

B. in high capacity furnace

C. as basic raw material

D. by neutron irradiation of throium

E. artificially

45. A fast breeder reactor uses following as fuel_________________?
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A. natrual uranium

B. enriched uranium

C. U235

D. plutonium

E. thorium

46. Uranium-233 is produced__________________?
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A. by neutron irradiation of Uz

B. by neutron irradiation of thorium

C. as basic raw material

D. in high capacity furnaces

E. artificially

47. In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?
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A. less than 1.0

B. greater than 1.0

C. equal to zero

D. equal to 1.0

E. equal to infinity

48. A fast breeder reactor__________________?
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A. uses graphite rods as moderator

B. uses ferrite material as moderator

C. has no moderator

D. has powerful moderator

E. uses pressurised water as moderator

49. In triggering fission, the following types of neutrons are desirable_________________?
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A. fast moving

B. neutrons at rest

C. slow moving

D. critical neutrons

E. none of the above

50. The presence of reflector in nuclear power plants results in___________________?
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A. increased production of neutrons

B. controlled production of neutrons

C. complete absorption of neutrons

D. decrease of speed of neutrons

E. decreased leakage of neutrons