Chemical Engineering MCQs

Page No. 357

The critical mass of a fissionable material can be reduced by__________________?


aHeating it


bCooling it


cSurrounding it by neutron reflecting material


dSurrounding it by neutron absorbing material



Energy equivalent to one atomic mass unit (amu) is ______________ MeV?


a9.31


b93.1


c931


d9310


View Answer 931

Which of the following is the most harmful for the human being ?


aβ-rays


bX-rays


cγ-rays


dUltra violet rays


View Answer γ-rays

A fast breeder reactor employs___________________?


aGraphite as moderator


bWater as coolant


cMolten sodium as coolant as well as moderator


dU-235 as fuel


View Answer U-235 as fuel

Both tritium and deuterium have the same number of_______________?


aNeutrons


bElectrons


cProtons


dNucleons


View Answer Neutrons

Main source of ______________ is monazite sand?


aUranium


bPolonium


cHafnium


dThorium


View Answer Thorium

Research reactors are normally meant for_____________________?


aProducing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on different materials


bAccelerating the neutrons


cPower generation


dNone of these



Artificially produced radioactive isotopes are used for____________________?


aPower generation


bTreatment of certain diseases


cInitiating nuclear fission and fusion


dAll A., B. and C.



Which one is different for the neutral atoms of the isotopes of an element ?


aAtomic weights


bAtomic numbers


cNumber of protons


dNumber of electrons


View Answer Atomic weights

Uranium is recovered from its ore (pitchblende) by________________?


aFroth floatation technique


bLeaching with sulphuric acid


cSmelting in a furnace


dDissolving in water



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