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Current Affairs January 2024

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4

Plutonium (Pu239) is produced

A. Artificially

B. When U238 is irradiated by neutrons

C. By fission of Th232

D. As basic raw material

Correct Answer :

B. When U238 is irradiated by neutrons


Related Questions

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4

A fast breeder reactor uses

A. 90% U₂₃₅

B. U₂₃₈

C. U₂₃₅

D. Pu₂₃₉

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4

U₂₃₃ is produced

A. Artificially

B. As basic raw material

C. When thorium is irradiated by neutrons

D. By fission of U₂₃₈

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4

Boiling water reactor employs

A. Boiler

B. Direct cycle of coolant system

C. Double circuit system of coolant cycle

D. Multi passes system

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4

Reactors for propulsion applications are designed for

A. Any form of uranium

B. Natural uranium

C. Enriched uranium

D. Plutonium

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4

In a thermal power plant, coal from the coal handling plant is moved to the boiler bunker through a

A. Belt conveyor

B. Bucket conveyor

C. Fork lift truck

D. Overhead crane

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4

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

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4

In fast breeder reactors

A. Any type of moderator can be used

B. Graphite is used as the moderator

C. Heavy water is used as the moderator

D. Moderator is dispensed with.

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4

U235 will undergo fission by

A. High energy (fast) neutrons alone

B. Low energy (slow) neutrons alone

C. Either fast or slow neutrons

D. Medium energy neutrons

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4

The risk of radioactive hazard is greatest in the turbine with following reactor

A. Pressurised water

B. Boiling water

C. Gas cooled

D. Liquid metal cooled

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4

The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is

A. Same

B. Lower

C. Higher

D. Unity

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4

Breeder reactors employ liquid metal coolant because it

A. Acts as good moderator

B. Produces maximum steam

C. Transfers heat from core at a fast rate

D. Breeds neutrons

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4

The unit of radioactivity is

A. Electron volt

B. Electron ampere

C. Curie

D. MV

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4

Hydrogen is preferred as better coolant in comparison to CO₂ because former

A. Is lighter

B. Is inert

C. Has high specific heat

D. Is a good conductor

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4

Which is not identical for an atom and an isotope?

A. Mass number

B. Atomic number

C. Chemical properties

D. Position in periodic table

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4

The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is

A. Plutonium

B. Uranium

C. Deuterium

D. Thorium

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4

Atomic number of an element in the periodic table represents the numbers of

A. Protons in the nucleus

B. Electrons in the nucleus

C. Neutrons in the nucleus

D. Electrons in the atom

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4

U233 is produced

A. As basic raw material

B. By neutron irradiation of Uz

C. By neutron irradiation of thorium

D. Artificially

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4

The coolant used in boiling water reactor is

A. CO2

B. Pressurised water

C. Mixture of water and steam

D. Liquid metal

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4

In boiling water reactor, moderator is

A. Coolant itself

B. Ferrite rod

C. Graphite rod

D. Liquid sodium metal

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4

The secondary fuel used in nuclear power plants is

A. U₂₃₃ and Pu₂₃₉

B. U₂₃₅ and Th₂₃₂

C. U₂₃₅ and Pu₂₃₈

D. U₂₃₃ and Pu₂₃₈

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4

Enriched uranium may contain fissionable contents of the order of

A. 1-99 %

B. 1-25 %

C. 1-50 %

D. 1-75 %

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4

U238 will undergo fission by

A. High energy (fast) neutrons alone

B. Low energy (slow) neutrons alone

C. Either fast or slow neutrons

D. Medium energy neutrons

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4

Fast breeder reactor uses

A. Boiler

B. Direct cycle of coolant system

C. Double circuit system of coolant cycle

D. Multi passes system

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4

Reactors designed for propulsion applications are designed for

A. Natural uranium

B. Enriched uranium

C. Pure uranium

D. Any type of uranium

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4

The energy released during the fission of one atom of Uranium 235 in million electron volts is about

A. 100

B. 200

C. 300

D. 400

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4

A nuclear reactor is said to be critical when the neutron population in the reactor core is

A. Rapidly increasing leading to the point of explosion

B. Decreasing from the specified value

C. Reduced to zero

D. Constant

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4

Solid fuel for nuclear reactions may be fabricated into various small shapes such as

A. Plates

B. Pallets

C. Pins

D. Any one of the above

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4

Uranium has isotopes

A. U₂₃₄

B. U₂₃₅

C. U₂₃₈

D. All of these

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4

The most commonly used moderator in nuclear plants is

A. Heavy water

B. Concrete and bricks

C. Graphite and concrete

D. Graphite

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4

Which of the following is the primary fuel?

A. U₂₃₃

B. U

C. U₂₃₈

D. Pu