Chemical Engineering MCQs

Page No. 368

Neutrons have mass approximately equal to that of _____________ atoms?


aHydrogen


bHelium


cDeuterium


dNone of these


View Answer Hydrogen

The emission of an a-particle causes the resultant nucleus to have____________________?


aMore atomic weight and less atomic number


bLess atomic weight and less atomic number


cLess atomic weight and more atomic number


dNone of these



Atoms with same number of neutrons, but different number of nucleons are called___________________?


aIsotones


bIsotones


cIsotopes


dIsostere


View Answer Isotones

Percentage of heavy water in ordinary water is around__________________?


a0.015


b7.54


c0.71


d32.97


View Answer 0.015

Ordinary water is not used as a moderator because, it___________________?


aHas a low absorption cross-section


bHas a low scattering cross-section


cAbsorbs neutrons


dDoes not absorb neutrons


View Answer Absorbs neutrons

First experimental observation of nuclear fission was done by ____________________?


aPlane


bRutherford


cFermi


dHahn and Strassmann


View Answer Fermi

The phenomenon of radioactivity was discovered by___________________?


aMadam Curie


bBecquerel


cRoentgen


dJ.J. Thomson


View Answer Becquerel

Thermal nuclear reactors using enriched uranium as fuel contains a maximum of ____________ percent fissile material i.e. U-235?


a1


b2


c3


d7


View Answer 3

In β-decay of radioactive material, the ratio of neutron to proton____________________?


aIncreases


bRemain same


cDecreases


dIs unpredictable; may increase or decrease


View Answer Decreases

The largest stable nucleus is ________________?


aU-235


bU-238


cPb-206


dBi-209


View Answer U-235

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