Tag: nuclear physics

Quizzes (6) Questions (198)

Questions Related to nuclear physics

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

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

  1. Iron rods

  2. Silicon rods

  3. Cadmium rods

  4. Platinum rods
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Nuclear reactors are normally refuelled ___________.

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Nuclear power plants always operates as ___________.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the reactors are highly stable?

  1. Pressurised water reactors

  2. Boiling water reactors

  3. Pressurised heavy water reactors

  4. Fast breeder reactors
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Boiling Water Reactors (BWR) are generally considered highly stable due to the negative void coefficient, where increased steam production reduces reactivity, providing an inherent safety mechanism.

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

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

  1. Controlled nuclear fission

  2. Photoelectric effect

  3. Motion of charged particles in electromagnetic

  4. Faradays laws of electromagnetic induction
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. $U-232$
  2. $Th-232$
  3. $C1-241$
  4. $U-236$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Common nuclear fuels include U-235, U-238, Th-232, and Pu-239/241. U-232 is a decay product, Th-232 is fertile (can become fuel), and C1-241 (likely Pu-241) is a fuel. U-236 is a stable decay product of U-235 fission, not used as fuel.

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

The pressurised water reactor $(PWR)$ employs:

  1. Light water and natural uranium

  2. Heavy water and enriched uranium

  3. Light water and enriched uranium

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pressurized Water Reactors (PWR) use light water as both coolant and moderator, and require enriched uranium (typically 3-5% U-235) to sustain the chain reaction.