Related Questions

Radioactive nuclear waste is treated in
A Mixer-settler extractor
B Rotating-disc contactor
C Pulsed column extractor
D Bollman extractor
__________ extractor uses centrifugal force for separating the two phases.
A Treybal
B Schiebel
C Podbielniak
D None of these
240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?
A 120
B 60
C 15
D none
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
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
Bollman extractor
A Is a static bed leaching equipment
B Is used for extraction of oil from oilseed
C Is a centrifugal extractor
D Employs only counter-current extraction
In a counter-current extractor, as the axial mixing increases, the extraction efficiency
A Increases
B Decreases
C Remains unchanged
D Depends on the pressure of the system
In a counter-current liquid extractor
A Both liquids flow at fixed rate
B Both liquids can have any desired flow rate
C Only one of the liquids may be pumped at any desired rate
D Liquid's flow rate depends upon the temperature and pressure
Which of the following types of nuclear reactors is most prone to radioactive hazards?
A Gas cooled reactor
B Molten Sodium Reactor
C Boiling water reactor
D Pressurised water reactor
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
A Arizona (U.S.A.)
B Chernobyl (undivided U.S.S.R.)
C Pensylvania (U.S.A.)
D Moscow (U.S.S.R.)
Radioactive solid nuclear wastes are disposed off by
A High temperature incineration
B Pathological incineration
C Pyrolysis
D Underground burial in concrete containers

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