Nucleus
Electron
Proton
Meson
B. Electron
Ordinary fluid
Heavy water
Molten lead
Hydrogen gas
5 MeV
10 MeV
199 MeV
168 MeV
Plates
Pallets
Pins
Any one of the above
Belt conveyor
Bucket conveyor
Fork lift truck
Overhead crane
Increases
Decreases
Have no effect on
None of these
Plutonium
Uranium
Deuterium
Thorium
Slowing down fast neutrons so that Uz fission continues by slow motion neutrons
Accelerating fast neutrons
Absorbing all neutrons
Using moderator
1 tonne of high grade coal
4.5 tonnes of high grade coal
10 tonnes of high grade coal
100 tonnes of high grade coal
To produce heat for thermoelectric power
To produce fissionable material
To propel ships, submarines, aircrafts
All of these
Infinite
Zero
Exactly balanced by the loss of neutrons through leakage
Initiated
Any form of uranium
Natural uranium
Enriched uranium
Plutonium
Carbon
Lead
Concrete
All of these
Same
More
Less
There is no such criterion
Operate at extremely high power densities.
Are liquid metal cooled
Produce more fuel than they consume
Use water as coolant
CO2
Pressurised water
Mixture of water and steam
Liquid metal
Alpha particles
Beta particles
Thermal neutrons
Fast neutrons and gamma rays
Graphite, CO2
Graphite, air
Heavy water, CO2
Lead, H2
Same
Lower
Higher
Unity
Lead or concrete
Lead and tin
Graphite or cadmium
Thick galvanised sheets
Reduce temperature
Extract heat from nuclear reaction
Control the reaction
Cause collision with the fast moving neutrons to reduce their speed
Electrons
α, β and γ rays
Neutron and gamma rays
None of these
Enriched uranium
Plutonium
Thorium
U₂₃₅
The most fissionable material
The basic fuel for nuclear paints
Basic raw material for nuclear plants
The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
U₂₃₅
U₂₃₈
Pu₂₃₉
Pu₂₃₃
Electrons
Protons
Neutrons
Atom
Artificially
When U238 is irradiated by neutrons
By fission of Th232
As basic raw material
For boiling pi water in the core
To use liquid sodium metal as coolant
To use intermediate coolant
To prevent the water coolant from boiling in the core
High neutron absorption cross-section
Low moderating efficiency
High neutron scatter cross-section
Low neutron absorption cross-section
Percentage of U₂₃₅ has been artificially increased
Percentage of U has been artificially increased
Percentage of U₂₃₄ has been artificially increased
Extra energy is pumped from outside
Neutron
Proton
Atom
Electron