Stable under nuclear radiation
Corrosion resistant
Good thermal conductor
All of these
D. All of these
Light weight atoms
Heavy weight atoms
Critical atoms
Zero weight atoms
1 neutron
3 neutrons
1, 2 neutrons
2 neutrons
Control temperature
Control radioactive pollution
Control absorption of neutron
Control fuel consumption
1 MeV
2.4 MeV
4.3 MeV
7.8 MeV
Neutron
Proton
Atom
Electron
Return the neutrons back into the core
Shield the radioactivity completely
Check pollution
Conserve energy
Natural uranium
Enriched uranium
Pure uranium
Any type of uranium
High energy (fast) neutrons alone
Low energy (slow) neutrons alone
Either fast or slow neutrons
Medium energy neutrons
At the lower rate than the consumption
At a higher rate than the consumption
At an equal rate of the consumption
Depends on other considerations
U₂₃₅
U₂₃₈
Pu₂₃₃
Pu₂₃₉
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
Plutonium
Uranium
Deuterium
Thorium
Increased production of neutrons
Complete absorption of neutrons
Controlled production of neutrons
Decreased leakage of neutrons
Artificially
As basic raw material
When thorium is irradiated by neutrons
By fission of U₂₃₈
U₂₃₃
U
U₂₃₈
Pu
Same
Lower
Higher
Unity
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
Slow down the speed of fast moving neutrons
Control the reaction
Reduce the temperature
Extracts heat from nuclear reaction
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
Plates
Pallets
Pins
Any one of the above
Infinite
Zero
Exactly balanced by the loss of neutrons through leakage
Initiated
Boiling water
Gas cooled
Pressurised water
All of the above
Increases
Decreases
Have no effect on
None of these
Any form of uranium
Natural uranium
Enriched uranium
Plutonium
Absorb excess neutrons
Control fuel consumption
Control temperature
All of these
U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%
U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%
U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%
U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%
To maintain constant pressure in primary circuit under varying load
To Supply high pressure steam
To increase pressure of water in primary circuit
To provide sub cooled water at high pressure
Graphite
Heavy water
Concrete
Graphite and concrete
X-rays
Infrared rays
Neutrons and gamma rays
Electrons
Rapidly increasing leading to the point of explosion
Decreasing from the specified value
Reduced to zero
Constant