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Current Affairs January 2024

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4

Isotopes of same elements have

A. Same atomic number and different masses

B. Same chemical properties but different atomic numbers

C. Different masses and different atomic numbers

D. Different chemical properties and same atomic numbers

Correct Answer :

B. Same chemical properties but different atomic numbers


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

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

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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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

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

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 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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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

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 triggering fission, which types of neutrons are more effective?

A. Fast

B. Slow

C. In bulk

D. Static

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4

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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4

Which of the following particles is the lightest?

A. Nucleus

B. Electron

C. Proton

D. Meson

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4

Which of the following is the primary fuel?

A. U₂₃₃

B. U

C. U₂₃₈

D. Pu

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4

In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be

A. Greater than 1.0

B. Less than 1.0

C. Equal to zero

D. Equal to 1.0

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4

The energy required to be applied to a radioactive nucleus for the emission of a neutron is

A. 1 MeV

B. 2.4 MeV

C. 4.3 MeV

D. 7.8 MeV

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4

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

A. Same

B. More

C. Less

D. May be less or mote depending on size

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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

A nuclear unit becoming critical means

A. It is generating power to rated capacity

B. It is capable of generating much more than rated capacity

C. There is danger of nuclear spread

D. Chain reaction that causes automatic splitting of the fuel nuclei has been established

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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 boiling water reactor, moderator is

A. Coolant itself

B. Ferrite rod

C. Graphite rod

D. Liquid sodium metal

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4

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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4

Breeder reactor has a conversion ratio of

A. Unity

B. More than unity

C. Less than unity

D. Zero

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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

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

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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4

A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

A. Slow down the speed of fast moving neutrons

B. Control the reaction

C. Reduce the temperature

D. Extracts heat from nuclear reaction

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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

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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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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Reflector in nuclear power plants _________ neutron leakage.

A. Increases

B. Decreases

C. Have no effect on

D. None of these