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Nuclei Physics - Nuclei

Bihar Board (BSEB) - STD 12 Science - Physics (BSEB - English Medium). 85 questions in this chapter.

Question types

Nuclei question types

85 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

85
Questions
7
Question groups
5
Question types
Sample Questions

Nuclei questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q [1M]1 Mark
Those atoms which have the same atomic number but different mass number are called :
  • A
    isobars
  • B
    isotones
  • ✓
    isotopes
  • D
    isomers

Answer: C.

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Q 3M.C.Q [1M]1 Mark
One of the specialties of nuclear reactions is that in their disintegrated or fused part :
  • A
    The total charge number remains constant.
  • ✓
    The total charge number changes.
  • C
    The total mass number changes.
  • D
    None of the above

Answer: B.

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Q 4M.C.Q [1M]1 Mark
The binding energy per nucleon for the parent nucleus is $E _1$ and for the decayed nuclei is $E _2$. Then :
  • A
    $E _1=2 E _2$
  • B
    $E _1> E _2$
  • ✓
    $E _2> E$
  • D
    $E _2=2 E _1$

Answer: C.

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Q 5M.C.Q [1M]1 Mark
The size of the nucleus is approximately :
  • A
    $10^{-10}$ meters
  • ✓
    $10^{-15}$ meters
  • C
    $10^{-5}$ meter
  • D
    $10^{-18}$ meters

Answer: B.

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Q 11Short Answer Type Questions [2M]2 Marks
The fission properties of ${ }_{94}^{239} Pu$ are very similar to those of ${ }_{92}^{235} U$. The average energy released per fission is 180 MeV . How much energy, in MeV, is released if all the atoms in 1 kg of pure ${ }_{94}^{239} Pu$ undergo fission?
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Q 12Short Answer Type Questions [2M]2 Marks
Suppose, we think the fission of a ${ }_{26}^{56} Fe$nucleus into two equal fragments, ${ }_{13}^{28} Al$.Is this fission energetically possible? Argue by working out Q of the process.
Given : $m\left({ }_{26}^{56} Fe \right)=55.93494 u$
and $\quad m\left({ }_{13}^{28} Al \right)=27.98191 u$
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Q 203 Marks Question3 Marks
The Q-value of a nuclear reaction A + b → C + d is defined by
$Q =\left[m_{ A }+m_b-m_{ C }-m_d\right] c^2$
where the masses refer to the respective nuclei. Determine from the given data the Q-value of the following reactions and state whether the reactions are exothermic or endothermic :
(i) ${ }_1^1 H +{ }_1^3 H \rightarrow{ }_1^2 H +{ }_1^2 H$
(ii) ${ }_6^{12} C +{ }_6^{12} C \rightarrow{ }_{10}^{20} Ne +{ }_2^4 He$
Atomic masses are given to be
$\begin{array}{l} m \left({ }_1^2 H \right)=2.014102 u \\ m\left({ }_1^3 H \right)=3.016049 u \\ m\left({ }_6^{12} C \right)=12.000000 u \\ m\left({ }_{10}^{20} Ne \right)=19.992439 u \end{array}$
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Q 214 Marks Questions4 Marks
Calculate the height of the potential barrier for a head-on collision of two deuterons.
(Hint: The height of the potetnial barrier is given by the Coulomb repulsion between the two deuterons when they just touch each other. Assume that they can be taken as hard spheres of radius 2.0 fm.)
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Q 23Long Answer Type Questions [5M]5 Marks
A given coin has a mass of 3.0 g. Calculate the nuclear energy that would be required to separate all the neutrons and protons from each other. For simplicity assume that the coin is made entirely of ${ }_{29}^{63} Cu$ atoms (of mass 62.92960 u).
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Q 24Long Answer Type Questions [5M]5 Marks
Obtain the binding of the nuclei ${ }_{26}^{56} Fe$ and ${ }_{83}^{209} Bi$ in units of MeV from the following data :
$m\left({ }_{26}^{56} Fe \right)=55.934939 u$
$m\left({ }_{83}^{209} Bi \right)=208.980388 u$
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