Which of the following types of nuclear reactors is most prone to radioactive hazards?

A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are

A

Equal in size

B

Of different sizes

C

Of such size that the ratio of their volumes is

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

Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor?

A

Molten sodium cooled

B

CO₂ gas cooled

C

Pressurised water

D

Boiling water

Which is the most commonly used molten metal for cooling of nuclear reactors?

A

Zinc

B

Sulphur

C

Sodium

D

Manganese

Nuclear Reactors are based on which of the following phenomenon?

A

Magnetic confinement of Plasma

B

Nuclear Fusion

C

Controlled Nuclear Fission

D

None of the above

Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

A

Melting point, hence can be subjected to higher temperature

B

Density ; hence core volume for a given power output would be smaller

C

Resistance to effects of irradiation

D

All of the above

Heavy water used in the nuclear reactors to slow down the speed of neutrons is

A

Highly purified water

B

A compound of oxygen and deuterium

C

Water having dissolved salts of heavy metals

D

None of these

The control rods in the control system of nuclear reactors are used to

A

Absorb excess neutrons

B

Control fuel consumption

C

Control temperature

D

All of these

Nuclear reactors are used

A

To produce heat for thermoelectric power

B

To produce fissionable material

C

To propel ships, submarines, aircrafts

D

All of these

Which of the following types of nuclear reactors is most prone to radioactive hazards?

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