ANS:- D, 3) The disintegration rate of a radioactive element, A. progressively increases. D. much more A boiling water reactor uses demineralized water as a coolant and neutron moderator. ANS:- B. B. helium nucleus. ANS:- A, 79) The new nucleus formed after ß-decay of a radioactive element has, A. less atomic number C. first C. is the first power reactor in India, which became critical in 1969. 146) How many atoms are present in one gm-atom of an element? Thermal neutron reactors use water (normal and heavy), water vapor, organic liquids, carbon dioxide as a coolant. Liquid metal cooled reactor. D. Stainless steel B. Tuticorin B. exponential ANS:- A, 56) Coolant used in a boiling water reactor is, A. hydrogen gas 194) Energy equivlant to one atomic mass unit (amu) is __________ MeV. B. C. resistance to effects of irradiation. Fast breeder reactor D. none of these. Molten sodium cooled ANS:- A, 21) Use of molten metal as a coolant in fast breeder reactor helps in, A. rapid heat transfer from the core. C. 931 MeV B. boiling water reactor (BWR). ANS:- A, 90) Water is a better coolant than a gas (like CO2, He, N2 etc. This water is kept liquid under high pressure. There are many ways in which it could be used. D. carbon 233) What is the history of Nuclear Engineering? A. thermal Helium cooled C. Rescolite Sodium ANS:- A. C. protons B. ANS:- B, 4) Heavy water used in the nuclear reactors to slow down the speed of neutrons is, A. highly purified water. ANS:- D. 12) Heavy water is preferred over ordinary water as a coolant, because it. B. converts fertile material (e.g., U-238) into fissile material (Pu-239). C. Out of a, ß, and ?-rays, the one having maximum penetration power are ?-rays. B. is generally made of boron, hafnium or cadmium. C. potential difference The disintegration rate of a radioactive substance can not be increased by heating it. A. Deuterium and tritium 112) Out of the following, nucleus of __________ atom contains the largest number of neutrons. D. neutron heavy water) is used as moderator & coolant. C. coolant & moderator In the BWR the water in the reactor core is permitted to boil under a pressure of 75 atmospheres, raising the boiling point to 285°C and the steam generated is used directly to drive a steam turbine. ANS:- D, 51) The molecular weight of heavy water is, 52) The size of an atom is of the order of one, A. Angstrom The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively. B. reciprocating Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. A. U-235 ANS:- B, 134) Mass of a positron is same as that of a/an, A. electron The water in the core is heated by nuclear fission … C. Pb-206 D. none of these 96) Which is not a fissile nuclear material? D. may increase or decrease depending on the material. ANS:- C. 73) Extraction of uranium from its ore is done by __________ method. ANS:- B. D. isoters D. none of these. A. U-235 D. Kinetic energy of neutrons In compariso… D. Carbon dioxide D. none of these. C. Instantaneous release of ?-rays D. X-rays C. surrounding it by neutron reflecting material. B. ANS:- B, A. U-235 D. Tritium On the other hand, the coolant (water) is allowed to boil (or change its phase from water to steam) in the Boiling Water Reactor (BWR). D. Pu-239 production of heavy water requires a dedicated, concentration of much less than O.1% to the 99%, used in a CANDU reactor. A. a & ß B. operating personnels B. has an installed capacity of 400 MW. C. 1012 Is This Answer Correct? D. U-232 B. solid substance. Plane D. all (a), (b) and (c) ANS:- A. B. isotopes D. nucleons B. U-234 C. uranium carbide ANS:- A, 154) Nuclides having the same atomic numbers are termed as, A. isotopes A. Uranium-238 C. radium 0.71 B. power generation on commercial scale. C. In ordinary hydrogen, 1H1 and 1H2 are present in the ratio 6400:1. B. ß-emission C. Roentgen A. neutrons B. U-235 contaminates the electricity generating turbine. C. isobars C. the fuel and the moderator is mixed to form a homogeneous material. ANS:- A, 189) In a nuclear explosion, the energy is released primarily in the form of __________ energy-, A. potential D. poorer corrosion resistance. D. none of these D. None of these. B. molybdenum. If the half life period of a radioactive substance is one month, then, A. D. Speed of a-rays is more than that of ?-rays. D. none of these. 99.29 C. Heterogeneous reactor. 22) Which of the following is a non-fissile material? B. electrons 93) Energy produced in the nuclear fission is of the order of __________ MeV.   Privacy The coolant is kept at a lower pressure than in a PWR (about 7 MPa or 1 000 psi) allowing the coolant to boil as it receives heat from the reactor. C. Boiling water B. emission of hazardous radiation. 162) The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second. ANS:- A. ANS:- B, 125) Uranium ore is mined & concentrated in India at, A. Jadugoda(Jharkhand) B. The heated, high pressure water then flows to a steam generator, where it transfers its thermal energy to lower pressure water of … ANS:- D, 201) Molten sodium (as a coolant in fast breeder reactor), A. can’t attain high temperature at normal pressure. Water in light water reactors. C. initiating nuclear fission and fusion. C. lubricant. C. it contains neutrons. D. Gamma rays are high energy electrons. ANS:- A, A. Positron is the antiparticle of electron. ANS:- A, A. ANS:- C. 207) The atomic number of a radioactive element is not changed, when it emits __________ rays. C. Uranium-233 B. has much lower melting point (640C ) compared to thorium (1690C). ANS:- C. 131) Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays. B. superheating the steam. ANS:- D, 104) Percentage of heavy water in ordinary water is around. D. Curie Loss of electrons from neutral atoms produces negative ions. B. requires comparatively smaller pumps and heat exchanger for a given heat transfer rate. The coolant used in boiling water reactor is (a) C02 (b) pressurized water (c) mixture of water and steam (d) liquid metal (e) mercury. ANS:- A. C. physical beneficiation B. Ramagundam C. power generation. B. energy 179) The atomic weight and atomic number of an element are A and Z respectively. B. a-particle origin, Canada, and the remainder in Argentina, India, Pakistan, the Republic of Korea and. ANS:- B. ANS:- D. 13) The ratio of mass of a neutron to that of an electron is about 1839. D. none of these. B. power C. heavy water moderated B. faster heat removal rate from the core. ANS:- D. 213) Which of the following may not need a control rod ? ANS:- D. 77) Net efficiency of ordinary light water cooled nuclear reactor is about __________ percent. B. electrons The BWR uses ordinary water (light water) as both its coolant and its moderator. C. centrifugal A. acts both as an efficient coolant as well as a moderator. ANS:- C. 100) Thorium-232 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material. C. both (a) and (b). ANS:- A, 99) The critical mass of a fissionable material can be reduced by, A. heating it. B. U-238 as a fertile material. D. none of these. B. second B. neutron breeding capability. Thus the steam can be directly fed to the turbine without utilizing an intermediate heat exchanger. The use of light water as a coolant is beneficial as it can cool down the fuel at the same time as it heats up to steam. ANS:- B. B. an oxide of deuterium. D. quantity of fuel required for initiating fusion reaction is prohibitively high. A. C. U-238 C. Pressurised water C. 99.29 B. B. pressure A. radioactive 7.54 There, are two types, the Magnox (named from the, magnesium alloy used to clad the fuel elements), and the advanced gas-cooled reactor (AGR). ANS:- A ANS:- C. 9) Which of the following is the most harmful for the human being? 1 Yes 0 No, 165) The ratio of atomic radius to its nuclear radius is about, A. A. Carnotite This feature allows, high availability but also increases the complexity, As regards gas-cooled reactors, 33 were in, commercial use only in the United Kingdom. C. 6 x 10 32 C. 14.4 T D. Boiling water reactor ANS:- D. 57) Liquid metal (e.g, . 18 227) Which is the most commonly used molten metal for cooling of nuclear reactors ? D. all (a), (b) & (c) C. more than 92U235 + 3 ?1 56Ba143 + 36Kr90 C. Fermi B. C. Zircalloy (an alloy of zirconium and aluminium). D. surrounding it by neutron absorbing material. In fast nuclear reactors: liquid metals (mainly sodium) and also gases (for example, water vapor, helium). uranium. 6.31 Seventeen RBMK remain in operation of which, 15 were in the Russian Federation and two in, Lithuania. ANS:- B, 137) Fast breeder test reactor at Kalpakkam is designed for using, A. thorium as a fertile material. A. homogeneous ANS:- B, 158) The half life period of a radioactive element depends on its, A. temperature A. electromagnetic B. absorb the secondary neutrons. B. water as coolant. C. is highly ductile. Research reactor The cooling water is maintained at about 75 atm (7.6 MPa, 1000–1100 psi) so that it boils in the core at about 285 °C (550 °F). 27) U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent. C. ordinary water D. reflects ANS:- C, 217) Commercial power generation from fusion reactor is not yet possible, because, A. it is difficult to control fusion reaction. 232) Which of the following may be used to measure the rate of nuclear disintegration? An advantage of, the CANDU design is that refuelling can take place, during operation, whereas PWRs and BWRs must, shut down in order to refuel. D. use molten sodium as coolant. C. iron B. pyrometallurgical 85) Quantity of fissionable material (i.e. A. Uranium-235 D. Positron is heavier than a proton. Atomic weights D. either more or less== C. 3300 16) Nuclear power reactor located at Tarapur is of __________ type. C. 6 A. logarithmic 50) Which of the following is not a good moderating material? ANS:- B, A. radioactivity ANS:- C, 10) Coolant used in a fast breeder reactor is, A. molten sodium D. thorium What is the number of neutrons in the atom of that element? ANS:- D, 54) The phenomenon of nuclear fission is opposite to that of, A. radioactive decay Is This Answer Correct? ANS:- A, 53) An ideal coolant for a nuclear reactor should, A. be a good absorber of neutrons. C. Kalpakkan C. Ionising power of ß-rays is higher than that of a-rays. 15) Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor? B. isobars The water within the primary system passes over the reactor core to act as a moderator and coolant but does not flow to the turbine. ANS:- C, 40) The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is, 41) Function of control rod in a nuclear reactor is to control, A. temperature C. 1 B. ANS:- B, 198) A homogeneous reactor is the one, in which the, A. fissile atoms are evenly distributed throughout the mass of nuclear reactor. Molten sodium cooled ANS:- C, 58) In a pressurised water reactor (PWR), the, A. fuel is natural uranium and heavy water acts both as moderator & coolant. B. fissioned by slow (thermal) neutrons. B. is less hard (in the range of silver). ANS:- D ANS:- A, 89) Percentage of the heavy water in ordi water is around, A. ANS:- C. 39) In nuclear reactions, __________ number is conserved. B. atomic 1/1836 (approximately) ANS:- A. 173) __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine. D. none of these The liquid also prevents corrosion. ANS:- B D. none of these C. limonite B. ß & ? 931 eV B. Kaiga (Karnataka) D. all (a), (b) and (c). C. tritium 1100 ANS:- C, 209) Moderating material used in a thermal-reactor should be a, A. good absorber of neutrons. B. ANS:- C, A. Isotopes have the same number of protons & electrons, but different number of neutrons. 186) Sodium melts (at atmospheric pressure) at a temperature of __________ C. 187) Hydrogen bomb employs the nuclear fusion of, A. hydrogen As in a PWR, the coolant, is passed through a steam generator so as to boil, ordinary water in a separate loop. ANS:- B. D. a, ß, & ?? B. U-238 Boiling water reactors BWRs There were 92 BWRs operating in nine countries of, countries, of which Japan and the United States, account for 64. 127) Heavy water has maximum density at __________ C. A. uses natural uranium as fuel. ANS:- B, 231) The decrease in the atomic number is not observed in case of, A. electron capture C. zircalloy. C. decreases. Is This Answer Correct? ANS:- A. C. a heavy liquid. 11) An element having large number of __________ is most easily subjected to nuclear fission. U-235. D. either (b) or (c) D. all (a), (b) and (c). A. nuclei ANS:- B, 8) Molten sodium is used as a coolant in a fast breeder reactor, because of its, A. excellent moderating properties. D. avoiding the mixing of water with radioactive sodium, as it may cause explosion. 6 x 10 23 D. magnesium diuranate 0.015 B. Its half life period is __________ hours. D. Narora D. Pressurised water ANS:- B. ANS:- A. C. Isotones C. Tritium C. molten sodium as coolant as well as moderator. C. isotones 164) Which one is different for the neutral atoms of the isotopes of an element? D. protect the fuel element from coming in contact with the coolant. ANS:- B. C. gives higher power density. B. a-particle is identical with a doubly charged helium ion. D. none of these Gas cooled reactor A. Breeder reactor. D. volute 1 reactor, was a boiling-water type. D. Heavy water plant D. Th-236 C. thermonuclear B. less atomic weight and less atomic number. C. BARC (Trombay). Is This Answer Correct? B. Pokharan D. does not absorb neutrons. D. Number of electrons Absence of earthquake prone zone in nearby areas. C. micron ANS:- D. 23) Candu reactor is a __________ nuclcear reactor. A. B. isomers D. electrometallurgical 219) Which of the following may not need a moderator? B. B. combustion C. it is difficult to initiate fusion reaction. D. infrared 6) 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. 48) Main source of __________ is monazite sand. 25) Nucleus of tritium has __________ neutrons. D. None of these D. nucleons 1 Yes 0 No, 221) Heat is generated in a nuclear reactor (thermal) by, A. combustion of a nuclear fuel e.g. D. homogeneous ANS:- D. 88) Which of the following is not used as a moderator in nuclear reactor? B. 1 Yes 0 No, 160) 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. D. Kaiga (Karnataka) Light water C. chemical D. helium A. Geiger-Muller Counter 1 Yes 0 No. D. Tuticorin Power reactor 1 Yes 0 No, 115) Nuclear power generation capacity in India is, A. D. all (a), (b) and (c). ANS:- A, 184) Research reactors are normally meant for, A. producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on dif ferent materials. D. all (a), (b) and (c). 211) A boiling water reactor is the one, in which the, A. coolant water is allowed to boil in the core of the reactor. Pressurized water nuclear reactors, or PWRs, are another type of light water reactors, using ordinary water as its coolant. molten sodium) is preferred as a coolant in case of a/an __________ reactor. 83) __________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section. C. Pu-239 B. is not at all corrosive, even at a higher temperature. ANS:- A, 35) ‘Light water’ used as a coolant in nuclear reactor is nothing but, A. ordinary water. B. supplying intense fields or beams of neutron for scientific experiments. 94) In ß-decay of radioactive material, the ratio of neutron to proton, A. increases. 1.44 T C. Kalpakkam (in Tamilnadu) A. Pitchblende B. it will completely disintegrate in two months. The nucleus of a hydrogen atom is identical with a proton. absence of a steam generator simplifies the design. C. economic power generation. D. neither (a) nor (b). D. accelerating the neutrons. B. X-rays C. use fast neutrons for fission. B. Ghatsila B. pressure B. Rutherford Is This Answer Correct? Is This Answer Correct? More than 65% of the commercial reactors in the United States are pressurized-water reactors or PWRs. D. uranium ore directly as a fuel. > 1 ANS:- A, 171) Nuclear fuel complex, Hyderabad is engaged in the job of, A. manufacture of nuclear fuel elements/assemblies . B. U-238 Unlike the pressurized water reactor (PWR), it does not have a steam generator. C. it will completely disintegrate in four months. D. 1015 Your email address will not be published. C. isotopes D. U-235 as fuel. ANS:- A, 193) “Critical mass” is the minimum mass of nuclear fissile material required for the, A. sustainment of chain reaction. In a PWR, the primary coolant is pumped under high pressure to the reactor core where it is heated by the energy released by the fission of atoms. ANS:- B, 64) A pressurised water reactor (PWR) uses pressurised water as a, A. coolant. Waterless coolant is used as an alternative to conventional water and ethylene glycol coolants. B. U-238 ANS:- A. B. Deuterium D. uranium sulphate ANS:- B. D. gas cooled B. Fermi ANS:- A. 31) First experimental observation of nuclear fission was done by, A. Is This Answer Correct? C. fast breeder A. chemical It used due to its availability and high heat capacity, both for cooling and heating. B. more B. a and ß B. 130) Radioactive decay of a material involves a __________ order reaction. C. lowering the coolant circulation pressure. ANS:- C. 44) Solar energy results from __________ reaction. ANS:- D ANS:- A. B. graphite moderated C. deuterium ANS:- D, 81) ‘Heavy water’ is termed as ‘heavy’ because it is, A. denser than water. B. plutonium B. Thorium-232 A. However, in the PWR system the cooling water is kept under pressure so that it cannot boil. ANS:- C, A. resembles steel in appearance. Water as a reactor coolant. B. a compound of oxygen and deuterium. ANS:- A D. 2T B. Hydrogen A. Zircalloy C. nuclear fusion D. 12.73 C. control the chain reaction. The ratio of the density of the ‘nucleus’ to that of the ‘atom’ is 1012 . D. is unpredictable; may increase or decrease. B. moderator C. Deuterium atom has one proton and two neutrons in its nucleus. B. pressurised water B. Kota (Rajasthan) 150) Enrichment of uranium is done to increase the concentration of __________ in the natural uranium. 102) Nucleus of 92U235 contains __________ protons. 108 ANS:- C. 199) Which one is the radioactive isotope of hydrogen? B. Jadugoda (in Jharkhand) D. Both (b) and (c) A. U-233 The PWR differs in another respect from the boiling water … A. ANS:- B, 63) Out of the following places, heavy water plant is not located at, A. Baroda ANS:- B. C. 3 x 1011 ANS:- C, A. 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