105
108
1012
1015
✅ The correct answer is option A.
Chemical Engineering MCQs
Which one is different for the neutral atoms of the isotopes of an element ?
Atomic weights
Atomic numbers
Number of protons
Number of electrons
✅ The correct answer is option A.
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. If the half life period of a radioactive substance is one month, then
3/4th of it will disintegrate in two months.
it will completely disintegrate in two months.
it will completely disintegrate in four months.
l/8th of it will remain intact at the end of four months.
✅ The correct answer is option B.
Research reactors are normally meant for
producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on dif ferent materials.
accelerating the neutrons.
power generation.
none of these
✅ The correct answer is option A.
Which of the following is a moderating material used in nuclear reactor ?
Graphite.
Cadmium.
Zircalloy (an alloy of zirconium and aluminium).
Stainless steel.
✅ The correct answer is option A.
A homogeneous reactor is the one, in which the
fissile atoms are evenly distributed throughout the mass of nuclear reactor.
same substance (e.g. heavy water) is used as moderator & coolant.
the fuel and the moderator is mixed to form a homogeneous material.
all (a), (b) and (c).
✅ The correct answer is option C.
‘Light water’ used as a coolant in nuclear reactor is nothing but
ordinary water.
mildly acidic (pH = 6) water.
mildly alkaline (pH = 8) water.
none of these.
✅ The correct answer is option A.
Which is used as a coolant in nuclear reactor due to its high capture cross-section ?
H2
N2
He
CO2
✅ The correct answer is option A.
Nuclear fuel usually used in a Boiling Water Reactor (BWR) is
plutonium
enriched uranium
natural uranium
thorium
✅ The correct answer is option B.
Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
equal to
less than
more than
either more or less
✅ The correct answer is option C.