__________ extractor is used for the concentration of radioactive nuclear waste.

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

__________ extractor is used for the concentration of radioactive nuclear waste.

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