Nuclear reactor - class-XI
Description: nuclear reactor | |
Number of Questions: 104 | |
Created by: Gagan Singh | |
Tags: energy production energy inside the atom physics nuclear physics chemistry |
The most penetrating atom smashing particle is
Boiling water reactor and pressurized water reactors are
In a nuclear reactor, heavy water is used as a :
The critical mass of fissionable $U^{235}$ can be reduced by
Assertion (A) : Fragments produced in the fission of $U^{235}$ are radioactive
Reason (R) : The fragments have abnormally high proton to neutron ratio
Consider the following statements A and B and identify the correct statements.
Statement A : $p-n; p-p; n-n$ forces between nucleons are not equal and charge dependent
statement B : In nuclear reactor the fission reaction will be in accelerating state if the value of neutron reproduction factor is $k>1$
Which of the following are used as Control Rods :
a) Boron rods
b) Cadmium rods
c) Copper rods
Thermal neutrons are
In a critical chain reaction, energy is released at
The man-made element which was made in the nuclear reactor is
In nuclear reactor, Cadmium rods are used as
The material used to slow the neutrons in a reactor is called
Nuclear fission is caused by :
The fuel used in nuclear power plants is
The first atomic reactor was made by
Boron rods in a nuclear reactor are used to
Which of the following is a neutron absorber?
Control rods used in nuclear reactors are made of
For making atom bomb, what else is needed except $U^{235}$?
In a nuclear reactor, moderators slow down the neutrons which come out in a fission process.The moderators used have light nuclei. Heavy nuclei will not solve the purpose, because
The process by which the percentage of U-235' in U-238 is increased, is called
Heavy water is used in nuclear reactor as _________.
How many nuclear power plants does India have in 2018?
The term $BWR$ stands for
Most of the highly radioactive 'spent' fuel at nucleus power plant are ___________.
What is the importance of moderator in a nuclear reactor?
Which is the material responsible for controlling the chain reaction in nuclear reactor?
In a nuclear reactor, it is desirable to use reactor core in the form of ____________.
The nuclear reaction that takes place in a nuclear reactor is a/an ________ .
In nuclear reactor, graphite is used as ___________.
If natural uranium is used as fuel, the moderator used will be _________.
Water in boiling water reactor is used as ___________.
Heavy water is ________.
The process of increasing the percentage of fissionable $U-235$ in naturally occurring Uranium is called _________ .
In a nuclear reactor, nuclear energy is obtained by breaking the nucleus of uranium by :
The sources of energy obtained in a nuclear reaction are :
Heavy water is:
Nuclear power stations are usually located near source of water because.
The control rod in a nuclear reactor is made of.
The nuclear fission chain reaction is initiated by the particle.
In a nuclear reactor the excess reactivity can be controlled by using _____________ rods.
Cadmium rods are used in a nuclear reactor
The first atomic reactor was constructed by.
In a nuclear reactor heavy water is used as a.
In nuclear power station energy of uranium is used for producing
Which one moves with greatest speed :
The reaction that take place in nuclear reactor is:
Moderator is a substance that ..................... the neutrons in a nuclear reactor.
The nuclear reaction that takes place in a nuclear reactor is ____________.
The amount of $U^{235}$ to be fissioned, to operate a $10\ kW$ nuclear reactor is (Approximately)
The amount of $U ^ { 235 }$ in kg which is to be used per hour in a nuclear reactor of capacity $100$ ($E = 200 MeV/fission$)
High energy netrons are used in a nuclear reactor to initiate the fission reaction.
Cadmium rods are used as moderators in a nuclear reactor.
The material that slows down the neutrons in the nuclear reactor is called
An atomic power nuclear reactor can deliver $300$ MW. The energy released due to fission of each nucleus of uranium atom $U^{235} $ is $170$ MeV. The number of uranium atoms fissioned per hour will be
The fission of one uranium nucleus releases energy of amount x joules. Find the number of fissions required to produced energy at the rate of v MW for t hours a nuclear power plant.
During a nuclear fission reaction
The fissionable material used in a breeder reactor is ________
Atomic reactor is based on
The critical mass of $U^{235}$ can be reduced by
The most suitable material for moderator in a nuclear reactor is
Which of the following is the best nuclear fuel?
The atomic weight of uranium isotope, which is equally fissionable is :
The fission of $U^{238}$ is possible by
For maintaining sustained chain reaction, the following is required
In nuclear reactor which of the following quantities is conserved?
What is the order of the temperature at which average kinetic energy of an atom in gaseous hydrogen becomes equal to the binding energy of the electron in hydrogen atom?
The ratio $r$ of the rate of production of neutrons from uranium nucleus to the rate of leakage of neutrons for sustained chain reaction is
Thermal neutrons are those which
The number of fissions of $^{235}U _{92}$ required to a produce a power of $1\ W$ is :
State two safety measures to be taken while establishing a nuclear power plant.
A proton and a neutron are both shot at $100 ms^{-1}$ towards a $ _6^{12}C$ nucleus. Which particle, if either, is more likely to be absorbed by the nucleus?
Fast neutrons can easily be slowed down by
What is the purpose of Boron rods in a nuclear reactor ?
Control rods in a nuclear power plant is to
Scientists are working hard to develop nuclear fusion reactor. Nuclei of heavy, $ _{ 1 }^{ 2 }{ H }$, known as deuteron and denoted by D, can be thought of as a candidate for fusion reactor. The D-D reaction is $ _{ 1 }^{ 2 }{H }+ _{ 1 }^{ 2 }{ H }\rightarrow _{ 2 }^{ 3 }{ He+n+energy }$. In the core of fusion reactor, a gas of heavy hydrogen is fully ionized into deuteron nuclei and electrons.This collection of $ _{ 1 }^{ 2 }{ H }$ nuclei and electron is known as plasma. The nuclei move randomly in the reactor core and occasionally come close enough for nuclear fusion to take place. Usually, the temperatures in the reactor core plasma. Special techniques are used which confine the plasma for a time $\displaystyle { t } _{ 0 }$ before the particles fly away from the core. If $n$ is the density (number/volume) of deuterons, the product ${ nt } _{ 0 }$ is called Lawson number, In one of the criteria, a reactor is termed successful if Lawson number is greater than $5 \times { 10 }^{ 14}s/{ cm }^{3 }$. It may be helpful to use the following: Boltzmann constant
$k=8.6\times { 10 }^{ -5 }eV/K$; $\displaystyle \frac { { e }^{ 2 } }{ 4\pi { \epsilon } _{ 0 } } =1.44\times { 10 }^{ -9 }eVm$. In the core of nuclear fusion reactor. the gas becomes plasma because of :Introduction of which rod in a nuclear reactor controls chain reaction ?
Nuclear reactors are normally refuelled ___________.
The functions of the reflectors in nuclear power plant is that:
Which of the following are used as nuclear fuel?
Nuclear power plants always operates as ___________.
Which of the following is NOT a type of nuclear reactor?
Which of the reactors are highly stable?
Physics contributed most to the development of alternative energy resources with discovery of:
Which of the following is NOT used as a nuclear fuel?
The pressurised water reactor $(PWR)$ employs:
When the reactor shuts down why does it require cooling?
The nuclear reactor of the power plant must be shielded with ______walls.
The nuclear reactor at Kaiga is a :
Nuclear power reactor is based on the principle of.
A nuclear reactor must consist of which of the following parts?
I. Electric generator
II. Fissionable fuel elements
III. Moderator
Boron rods, in a nuclear reactor, are used as.
Best neutron moderator is.
A disadvantage of nuclear power is -
Cadmium rods are used as moderators in a nuclear reactor.
Best moderator for neutron is
In a nuclear power plant, uranium atoms
Boron rods are used in nuclear reactor as
High energy neutrons are used in a nuclear reactor to initiate the fission reaction.
Which of the following controls the chain reaction in a nuclear reactor?
In a nuclear reactor, the moderator used is
Which of the following is a good nuclear fuel?
In a nuclear reactor
The phenomenon of nuclear fission can be carried out both in a controlled and in an uncontrolled way. Out of the following, the correct statements vis-avis these phenomena are