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Current Affairs January 2024

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Which of the following particles is the lightest?

A. Nucleus

B. Electron

C. Proton

D. Meson

Correct Answer :

B. Electron


Related Questions

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Boiling water reactor uses the following as moderator, coolant and working fluid

A. Ordinary fluid

B. Heavy water

C. Molten lead

D. Hydrogen gas

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The total energy released in fission of U is

A. 5 MeV

B. 10 MeV

C. 199 MeV

D. 168 MeV

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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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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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Reflector in nuclear power plants _________ neutron leakage.

A. Increases

B. Decreases

C. Have no effect on

D. None of these

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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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A fission chain reaction in uranium can be developed by

A. Slowing down fast neutrons so that Uz fission continues by slow motion neutrons

B. Accelerating fast neutrons

C. Absorbing all neutrons

D. Using moderator

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One gram of uranium will produce energy equivalent to approximately

A. 1 tonne of high grade coal

B. 4.5 tonnes of high grade coal

C. 10 tonnes of high grade coal

D. 100 tonnes of high grade coal

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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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When a reactor becomes critical, then the production of neutrons is

A. Infinite

B. Zero

C. Exactly balanced by the loss of neutrons through leakage

D. Initiated

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Reactors for propulsion applications are designed for

A. Any form of uranium

B. Natural uranium

C. Enriched uranium

D. Plutonium

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The material most commonly used for shielding is

A. Carbon

B. Lead

C. Concrete

D. All of these

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A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is

A. Same

B. More

C. Less

D. There is no such criterion

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Pick up the wrong statement fast breeder reactors

A. Operate at extremely high power densities.

B. Are liquid metal cooled

C. Produce more fuel than they consume

D. Use water as coolant

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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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The following present serious difficulty in designing reactor shield

A. Alpha particles

B. Beta particles

C. Thermal neutrons

D. Fast neutrons and gamma rays

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Gas cooled reactor uses following materials as moderator, and coolant

A. Graphite, CO2

B. Graphite, air

C. Heavy water, CO2

D. Lead, H2

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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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The commonly used material for shielding is

A. Lead or concrete

B. Lead and tin

C. Graphite or cadmium

D. Thick galvanised sheets

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Moderator in nuclear plants is used to

A. Reduce temperature

B. Extract heat from nuclear reaction

C. Control the reaction

D. Cause collision with the fast moving neutrons to reduce their speed

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The nuclear radiators produced in a reactor which must be shielded are

A. Electrons

B. α, β and γ rays

C. Neutron and gamma rays

D. None of these

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A fast breeder reactor uses following as fuel

A. Enriched uranium

B. Plutonium

C. Thorium

D. U₂₃₅

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Ferrite material is

A. The most fissionable material

B. The basic fuel for nuclear paints

C. Basic raw material for nuclear plants

D. The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

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The primary fuel used in nuclear power plants is

A. U₂₃₅

B. U₂₃₈

C. Pu₂₃₉

D. Pu₂₃₃

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Half life of a radioactive isotope corresponds to the time required for half of the following to decay

A. Electrons

B. Protons

C. Neutrons

D. Atom

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Plutonium (Pu239) is produced

A. Artificially

B. When U238 is irradiated by neutrons

C. By fission of Th232

D. As basic raw material

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Pressurised water reactor is designed

A. For boiling pi water in the core

B. To use liquid sodium metal as coolant

C. To use intermediate coolant

D. To prevent the water coolant from boiling in the core

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Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

A. High neutron absorption cross-section

B. Low moderating efficiency

C. High neutron scatter cross-section

D. Low neutron absorption cross-section

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Enriched uranium is one in which

A. Percentage of U₂₃₅ has been artificially increased

B. Percentage of U has been artificially increased

C. Percentage of U₂₃₄ has been artificially increased

D. Extra energy is pumped from outside

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Which of the following is the heaviest?

A. Neutron

B. Proton

C. Atom

D. Electron