Nuclear and Particle Physics MCQs with Answers 2027

Q1

Which one of the following disintegration series of the heavy elements will give ²⁰⁹Bi as a stable nucleus?

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Q2

The lifetime of an atomic state is 1ns. The natural line width of the spectral line in the emission spectrum of this state is of the order of

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Q3

Open question

The quark content of

\sum^{+}, K^{-}, π^{-}

and p is indicated:

\sum^{+} ⟩ = ∣ uu s ⟩; K^{+} ⟩ = ∣ s u ⟩; ∣ π ⟩ = ∣ d ⟩; ∣ p ⟩ = ∣ uu d ⟩

In the process,

π^{-} + p \to K^{-} + \sum^{+},

considering strong interactions only, which of the following statements is true?

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Q4

Open question

The four possible configurations of neutrons in the ground state of

_{4}^{9} B e

nucleus according to the shell model, and the associated nuclear spin are listed below. Choose the correct one

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Q5

Open question

In the β-decay of neutron n → p + e^- +

V e

, the anti-neutrino

V e

escapes detection. Its existence is inferred from the measurement of

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Q6

Open question

The strangeness quantum number is conserved in

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Q7

Open question

The cross-sections of the reactions

p + \prod^{-} \to \sum^{-} + K^{+}

and

p^{-} + \prod^{+} \to \sum^{-} + K^{-}

at a given energy are the same due to

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Q8

Open question

A neutron scatters elastically from a heavy nucleus. The initial and final states of the neutron have the

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Q9

Open question

The mass difference between the pair of mirror nuclei

_{6}^{11} C

and

_{5}^{11} B

is given to be Δ MeV/c². According to the semi-empirical mass formula, the mass difference between the pair of mirror nuclei

_{9}^{17} F

and

_{8}^{17} O

will approximately be (rest mass of proton m_p = 938.27 MeV/c² and rest mass of neutron m_n = 939.57 MeV/c²)

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Q10

Open question

Consider a nucleus with N neutrons and Z protons. If m_p, m_n and BE represents the mass of the proton, the mass of the neutron and the binding energy of the nucleus respectively and c is the velocity of light in free space, the mass of the nucleus is given by

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Q11

Open question

The isospin and the strangeness of

Ω^{-}

Baryon are

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Q12

Open question

With reference to nuclear forces which of the following statements is not true?

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Q13

Open question

Choose the particle with zero Baryon number from the options given below.

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Q14

Open question

The first three energy levels of

_{90}^{228} T h

are shown below.
4⁺ __________ 187 keV
2⁺ __________ 57.5 keV
0⁺ __________ 0 keV
The expected spin parity and energy of the next level are given by

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Q15

Open question

The Baryon number of proton, the lepton number of proton, the Baryon number of electron and the lepton number of electron are respectively

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Q16

Open question

Which one of the following reaction is allowed?

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Q17

Open question

The semi-empirical mass formula for the binding energy of nucleus contains a surface correction term. This term depends on the mass number A of the nucleus as

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Q18

Open question

Which of the following decay is forbidden?

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Q19

Open question

The basic process underlying the neutron β decay is

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Q20

Open question

In the deuterium + tritium (d + t) fusion more energy is released as compared to deuterium + deuterium (d + d) fusion because

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