chemical engineering nuclear power engineering Mcqs
151. The critical mass of a fissionable material can be reduced by__________________?
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A. Cooling it

B. Surrounding it by neutron reflecting material

C. Surrounding it by neutron absorbing material

D. Heating it

152. Which one is the radioactive isotope of hydrogen ?
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A. Deuterium

B. Ortho-hydrogen

C. None of these

D. Tritium
153. Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at_______________?
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A. Alwaye (in Kerala)

B. Kalpakkam (in Tamilnadu)

C. Jadugoda (in Jharkhand)

D. Gopalpur coast (in Orissa)

154. A fast breeder reactor____________________?
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A. Uses natural uranium as fuel

B. Does not require a moderator

C. Both A. and B.

D. Neither A. nor B.

155. Solar energy results from _______________ reaction?
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A. Combustion

B. Thermonuclear

C. None of these

D. Fission

156. Heavy water used in the nuclear reactors to slow down the speed of neutrons is __________________?
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A. None of these

B. A compound of oxygen and deuterium

C. Water having dissolved salts of heavy metals

D. Highly purified water

157. Thorium metal__________________?
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A. Is highly ductile

B. Resembles steel in appearance

C. Is less hard (in the range of silver)

D. All A., B. and C.
158. A radioactive isotope undergoes decay with respect to time following _____________ law?
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A. Exponential

B. Logarithmic

C. Inverse square

D. Linear

159. Which of the following is not used as a moderator in nuclear reactor ?
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A. Beryllium

B. Light water

C. Molten sodium

D. Boron hydride

160. The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?
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A. 6.25

B. 12.5

C. 3.125

D. 25

161. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?
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A. 2200

B. 1100

C. 3300

D. 4400

162. Moderating material used in a thermal-reactor should be a ____________________?
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A. Poor absorber of neutrons

B. Solid substance

C. None of these

D. Good absorber of neutrons

163. The atomic mass of an element is fractional, because ______________________?
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A. Of uncertainty principle

B. It contains neutrons

C. It may have isotopes

D. It may have isobars

164. In the nuclear reaction, 93N239? 94Pu239 + ?; the missing particle is a/an__________________?
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A. Neutron

B. Position

C. Proton

D. Electron
165. Commercial power generation from fusion reactor is not yet possible, because_____________________?
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A. It is difficult to control fusion reaction

B. It is difficult to initiate fusion reaction

C. The fuel required (e.g. deuterium and tritium) is scarce

D. Quantity of fuel required for initiating fusion reaction is prohibitively high

166. The decay product of tritium (a beta emitter) is_________________?
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A. Hydrogen

B. Helium

C. Deuterium

D. Lithium

167. Sodium melts (at atmospheric pressure) at a temperature of ____________ C?
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A. 98

B. 348

C. 58

D. 588

168. Enriched uranium means that, it contains___________________?
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A. Only fissile material

B. No impurities

C. More than 0.71% of U-235

D. Only fertile material

169. The emission of an a-particle causes the resultant nucleus to have____________________?
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A. More atomic weight and less atomic number

B. Less atomic weight and more atomic number

C. Less atomic weight and less atomic number

D. None of these

170. Pressure in a Pressurised Water Reactor (PWR) is used for ____________________?
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A. None of these

B. Superheating the steam

C. Pressurising the water in the primary coolant circuit

D. Maintaining constant pressure in the primary cooling circuit under varying loads
171. Pick out the correct statement?
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A. Ionising power of ?-rays is higher than that of ?-rays

B. Speed of ?-rays is more than that of ?-rays

C. In ?-decay, the ratio of neutron to proton decreases

D. Positron is the antiparticle of electron
172. Pick out the correct statement?
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A. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively

B. Gain of electrons by neutral atoms form cations

C. Proton to neutron ratio in a stable nucleus is 2 : 1

D. Loss of electrons from neutral atoms produces negative ions

173. Emission of ?-particles during radioactive decay of a substance is from__________________?
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A. None of these

B. Outermost shell

C. Nucleus

D. Innermost shell

174. Extraction of uranium from its ore is done using ______________ methods?
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A. Electrometallurgical

B. Physical beneficiation

C. Chemical

D. Pyrometallurgical

175. The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is_____________________?
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A. More

B. Less

C. Much more

D. Same

176. A thermal nuclear reactor compared to a fast breeder reactor ?
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A. Uses slower neutrons for fission

B. Requires less fuel to run at the same power level

C. Gives higher power density

D. Uses faster neutrons for fission

177. A control rod________________?
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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.
178. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher _____________________?
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A. All A., B. and C.

B. Resistance to effects of irradiation

C. Density; hence core volume for a given power output would be smaller

D. Melting point, hence can be subjected to higher temperature

179. An electron has a mass that is approximately ____________ that of the proton?
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A. 1836 (approximately)

B. ?

C. 1

D. 1/1836 (approximately)
180. What is the average life of a radioactive atom having a half life period of T ?
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A. 2T

B. 0.144 T

C. 1.44 T

D. 14.4 T

181. A radioactive substance does not emit________________?
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A. ?-ray

B. Proton

C. ?-ray

D. Position

182. The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?
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A. 4

B. 1

C. 2

D. 0.5

183. Which is the most commonly used molten metal for cooling of nuclear reactors ?
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A. Mercury

B. Zinc

C. Sodium

D. Calcium

184. Critical mass is the minimum mass of nuclear fissile material required for the_______________________?
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A. Sustainment of chain reaction

B. Economic power generation

C. None of these

D. Power generation on commercial scale

185. Which of the following types of nuclear reactors is most prone to radioactive hazards ?
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A. Pressurised water reactor

B. Molten sodium cooled reactor

C. Boiling water reactor

D. Gas cooled reactor

186. Which of the following nuclear materials is fissile ?
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A. Thorium-232

B. None of these

C. Uranium-238

D. Plutonium-239
187. The ratio of volume of an atom to that of its nucleus is__________________?
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A. 1012

B. 8-Oct

C. 12-Oct

D. 108

188. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
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A. 159

B. 2537

C. 1837

D. 10000

189. Which of the following is not, a fertile material ?
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A. None of these

B. Th-232

C. U-238

D. U-233
190. A pressurised water reactor (PWR) uses pressurised water as a___________________?
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A. Moderator

B. Coolant

C. None of these

D. Working fluid in power turbine

191. The main ore of uranium is ______________________?
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A. Cassiterite

B. Monazite sand

C. Chalcopyrite

D. Pitchblende
192. The function of moderators in nuclear reactor is to _________________?
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A. None of these

B. Absorb the secondary neutrons

C. Slow down the secondary neutrons

D. Control the chain reaction

193. _____________ have the same mass number, but different nuclear charge ?
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A. Isobars

B. Isotopes

C. None of these

D. Isotones

194. Hydrogen bomb employs the nuclear fusion of __________________ ?
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A. Hydrogen

B. Helium

C. Deuterium

D. Tritium

195. U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about _____________ percent?
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A. 50

B. 97

C. 85

D. 3
196. Uranium is recovered from its ore (pitchblende) by________________?
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A. Smelting in a furnace

B. Froth floatation technique

C. Leaching with sulphuric acid

D. Dissolving in water

197. The half life period of a radioactive element depends on its _______________________?
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A. None of these

B. Pressure

C. Temperature

D. Amount

198. How many atoms are present in one gm-atom of an element ?
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A. 6 1023

B. 6 1032

C. 5 105

D. 2 1023

199. The half life period of a radioactive element depends upon the___________________?
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A. Temperature

B. None of these

C. Amount of element present

D. Pressure

200. 75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?
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A. 4

B. 3

C. 6-Jan

D. 4-Mar