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4

In natural uranium, the constituents of three naturally occuring isotopes are

A. U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%

B. U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

C. U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%

D. U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%

Correct Answer :

A. U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%


Related Questions

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Which of the following are ferrite materials?

A. U₂₃₃ and Pu₂₃₉

B. U

C. U₂₃₈ and Pu₂₃₉

D. U₂₃₈ and Th₂₃₉

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Reactors for propulsion applications use

A. Natural uranium

B. Molten lead

C. Any form of uranium

D. Thorium

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Reflector in nuclear plants is used to

A. Return the neutrons back into the core

B. Shield the radioactivity completely

C. Check pollution

D. Conserve energy

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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

Which of the following can be used as a coolant in nuclear plant?

A. Light or heavy water

B. Molten lead

C. Carbon dioxide

D. Freon

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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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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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Which of the following is the primary fuel?

A. U₂₃₃

B. U

C. U₂₃₈

D. Pu

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A power plant giving least running cost of production of electrical power is

A. Steam power plant

B. Gas turbine power plant

C. Hydro electric power plant

D. Nuclear power plant

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4

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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4

Which of the following is more appropriate for a moderator? One which

A. Does not absorb neutrons

B. Absorbs neutrons

C. Accelerates neutrons

D. Eats up neutrons

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4

In a fission process, maximum percentage of energy is released as

A. Kinetic energy of neutrons

B. Kinetic energy of fission products

C. Instantaneous release of gamma rays

D. Gradual radioactive decay of fission products

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A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

A. Stable under nuclear radiation

B. Corrosion resistant

C. Good thermal conductor

D. All of these

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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 function of control rods in nuclear plants is to

A. Control temperature

B. Control radioactive pollution

C. Control absorption of neutron

D. Control fuel consumption

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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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A fast breeder reactor uses following as fuel

A. Enriched uranium

B. Plutonium

C. Thorium

D. U₂₃₅

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Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal

A. Centrifugal

B. Axial

C. Reciprocation

D. Electromagnetic

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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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In nuclear fission

A. The original elements change into completely different elements

B. The electrons of the element change

C. The molecules rearrange themselves to form other molecules

D. None of the above

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Effective moderators are those materials which contain

A. Light weight atoms

B. Heavy weight atoms

C. Critical atoms

D. Zero weight atoms

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The energy produced by a thermal reactor of same size as a breeder reactor is

A. Almost same

B. Slightly more

C. Slightly less

D. Much less

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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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The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is

A. Higher cost of nuclear fuel

B. High initial cost

C. High heat rejection in condenser

D. Lower temperature and pressure conditions

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Plutonium 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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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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Which of the following is the heaviest?

A. Neutron

B. Proton

C. Atom

D. Electron

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Pick up the wrong statement

A. In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator.

B. Slow or thermal neutrons have energy of the order or 0.025 eV

C. Fast neutrons have energies above 1000 eV

D. Fast reactor uses moderator

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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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A fast breeder reactor uses

A. 90% U₂₃₅

B. U₂₃₈

C. U₂₃₅

D. Pu₂₃₉