Tag: nuclear physics

Questions Related to nuclear physics

Introduction of which rod in a nuclear reactor controls  chain reaction ?

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Iron rods

  2. Silicon rods

  3. Cadmium rods

  4. Platinum rods

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Correct Option: C
Explanation:

Cadmium rods are used as control rods in nuclear reactors to control the fission rate of uranium and plutonium. These are capable of absorbing many neutrons without fissioning themselves. Composition of control rods is designed for the neutron spectrum of the reactor. Rods are composed of boron,silver,indium and cadmium which can absorb excess neutrons.

Nuclear reactors are normally refuelled ___________.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. when they are decommissioned

  2. when the gauge indicates fuel low

  3. in every $12$ to $18$ months

  4. in every $2$ to $4$ weeks

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Correct Option: C
Explanation:

Nuclear power plants rum almost all the time and refuel only once every two years or so. Outages typically occur in the spring or autumn when electricity demand is lowest and there is little winter heating or summer air conditioning.

The functions of the reflectors in nuclear power plant is that:

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. It reflects the neutrons that are escaping from the case.

  2. It reflects the radiation escaping the case of the reactor.

  3. Both $(1)$ and $(2)$

  4. It accelerates the reaction.

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Correct Option: C
Explanation:

Both (1) and (2)

A reflector is a region of unfueled material surrounding the core . Its function is to scatter neutrons that leak from the core, thereby returning some of them back into the core. This design feature allows for a smaller core size. In addition, reflectors "smooth out" the power density by utilizing neutrons that would otherwise leak out through fissioning within fuel material located near the core's outer region.

Which of the following are used as nuclear fuel?

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. $ _{82}{Pb}^{208}$

  2. $ _{92}{U}^{235}$

  3. $ _{92}{U}^{238}$

  4. Both (B) and (C)

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Correct Option: D
Explanation:

Pb is the most stable element, it never disintegrates, hence it has no radioactivity and provides very less energy in fission

Nuclear power plants always operates as ___________.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. peak load plants

  2. base load plants

  3. can be used as both; the load and peak load plants depends on the requirements

  4. None of these

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Correct Option: B
Explanation:

Base load power plants operate at maximum output. They shut down or reduce power only to perform maintainance or repair. Base load power plants include coal, fuel oil, almost all nuclear, geothermal, hydroelectric, biomass and combined cycle matural gas plants.

Which of the following is NOT a type of nuclear reactor?

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Proton reactor

  2. Research reactor

  3. Breeder reactor

  4. Power reactor

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Correct Option: A

Which of the reactors are highly stable?

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Pressurised water reactors

  2. Boiling water reactors

  3. Pressurised heavy water reactors

  4. Fast breeder reactors

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Correct Option: B

Physics contributed most to the development of alternative energy resources with discovery of:

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Controlled nuclear fission

  2. Photoelectric effect

  3. Motion of charged particles in electromagnetic

  4. Faradays laws of electromagnetic induction

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Correct Option: A
Explanation:

Controlled fission reaction is carried out in reactor to produce electricity.

In fission due to mass defect huge energy is produced. Mainly uranium 235 is used as a fuel in the reactors.

Which of the following is NOT used as a nuclear fuel?

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. $U-232$

  2. $Th-232$

  3. $C1-241$

  4. $U-236$

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Correct Option: D

The pressurised water reactor $(PWR)$ employs:

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Light water and natural uranium

  2. Heavy water and enriched uranium

  3. Light water and enriched uranium

  4. None of these

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Correct Option: C