Tag: the nuclear power station

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Multiple choice chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

The critical mass of fissionable $U^{235}$ can be reduced by

  1. adding impurities

  2. heating material

  3. surrounding it by a neutron-reflecting material

  4. surrounding it by a neutron-absorbing material
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Surrounding a spherical critical mass with a neutron reflector reduces the mass needed for criticality.
A common material for a neutron reflector is beryllium metal.

Multiple choice chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

Assertion (A) : Fragments produced in the fission of $U^{235}$ are radioactive
Reason (R) : The fragments have abnormally high proton to neutron ratio

  1. Both A and R are true and R is correct explanation of A

  2. Both A and R are true and R is not correct explanation of A

  3. A is true but R is false

  4. A is false but R is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fragments produced in the fission of $U^{235}$ are radioactive.
The fragments have the neutron of proton ratio about 1.6.
So, Assertion is correct but reason is false.

Multiple choice chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

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 $k>1$

  1. Both A and B are correct

  2. Both A and B are wrong

  3. A is wrong B is correct

  4. A is correct B is wrong
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nuclear forces is charge independent
i.e. $F _{pp} = F _{pn} = F _{nn}$
If the K>1 the fission reaction will be in accelerating state.
So, correct choice is option C.

Multiple choice chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

Which of the following are used as Control Rods :


a) Boron rods
b) Cadmium rods
c) Copper rods

  1. a is correct

  2. b is correct

  3. c is correct

  4. a,b are correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cadmium and Boron rods are used as control rods in a nuclear reactor as , they are capable of absorbing many neutrons without themselves fissioning.
So, correct choice is option D.

Multiple choice chemistry energy production nuclear reactor the nuclear power station isotopes and nuclear chemistry

In a critical chain reaction, energy is released at

  1. increasing rate

  2. steady rate

  3. decreasing rate

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a critical chain reaction $K=1$,
where $K$ is the reproduction factor defined as the ratio of number of neutrons in any particular generation to the number of neutrons in the preceding generation.
As $K$ is $1$, energy is released in steady state.