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Current Affairs January 2024

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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

Correct Answer :

A. Protons in the nucleus


Related Questions

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4

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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4

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

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

A moderator generally used in nuclear power plants is

A. Graphite

B. Heavy water

C. Concrete

D. Graphite and concrete

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4

The presence of reflector in nuclear power plants results in

A. Increased production of neutrons

B. Complete absorption of neutrons

C. Controlled production of neutrons

D. Decreased leakage of neutrons

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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

Which of the following statement is correct regarding the features of a Breeder reactor?

A. It produces more fuel than it consumes.

B. It requires highly enriched fuel.

C. It requires liquid sodium metal as moderator.

D. All of the above

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4

A fast breeder reactor uses

A. 90% U₂₃₅

B. U₂₃₈

C. U₂₃₅

D. Pu₂₃₉

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4

Ideally the neutron flux in reactor should be

A. Maximum in centre and zero at side

B. Maximum at side and zero in canter

C. Uniform throughout

D. Zero throughout

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4

The main interest of shielding in nuclear reactor is protection against

A. X-rays

B. Infrared rays

C. Neutrons and gamma rays

D. Electrons

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4

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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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

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

A nuclear fission produces energy of following order in MeV

A. 20

B. 200

C. 2000

D. 20,000

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4

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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4

Each fission of U₂₃₅ produces following number of fast neutrons per fission

A. 1 neutron

B. 3 neutrons

C. 1, 2 neutrons

D. 2 neutrons

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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 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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4

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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4

In triggering fission, the following types of neutrons are desirable

A. Fast moving

B. Slow moving

C. Critical neutrons

D. Neutrons at rest

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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

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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4

Which of the following is the heaviest?

A. Neutron

B. Proton

C. Atom

D. Electron

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4

In nuclear fission each neutron that causes fission releases

A. No new neutron

B. At least one new neutron

C. One new neutron

D. More than one new neutron

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4

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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4

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

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 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

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