Chemical Engineering MCQs

Page No. 368

Neutrons have mass approximately equal to that of _____________ atoms?


aHydrogen

✓


bHelium

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cDeuterium

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dNone of these

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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

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cLess atomic weight and more atomic number

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dNone of these

✖



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


aIsotones

✓


bIsotones

✖


cIsotopes

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dIsostere

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View Answer Isotones

Percentage of heavy water in ordinary water is around__________________?


a0.015

✓


b7.54

✖


c0.71

✖


d32.97

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View Answer 0.015

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


aHas a low absorption cross-section

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bHas a low scattering cross-section

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cAbsorbs neutrons

✓


dDoes not absorb neutrons

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View Answer Absorbs neutrons

First experimental observation of nuclear fission was done by ____________________?


aPlane

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bRutherford

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cFermi

✓


dHahn and Strassmann

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View Answer Fermi

The phenomenon of radioactivity was discovered by___________________?


aMadam Curie

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bBecquerel

✓


cRoentgen

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dJ.J. Thomson

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View Answer Becquerel

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


a1

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b2

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c3

✓


d7

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View Answer 3

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


aIncreases

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bRemain same

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cDecreases

✓


dIs unpredictable; may increase or decrease

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View Answer Decreases

The largest stable nucleus is ________________?


aU-235

✓


bU-238

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cPb-206

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dBi-209

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View Answer U-235

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