Recommended PYQs (STRICTLY NCERT Based) Nuclei Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

_{82}^{290} X \overset{α}{\to} Y \overset{e^{+}}{\to} Z \overset{β^{-}}{\to} P \overset{e^{-}}{\to} Q

${ }_{82}^{290} X \xrightarrow{\alpha} Y \xrightarrow{e^{+}} Z \xrightarrow{\beta^{-}} P \xrightarrow{e^{-}} Q$
In the nuclear emission stated above, the mass number and atomic number of the product

Q

$Q$ respectively, are:
1.

286, 80

$286,80$
2.

288, 82

$288,82$
3.

286, 81

$286,81$
4.

280, 81

$280,81$

Subtopic: Types of Decay |

68%

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Q2:

The ratio of nuclear densities and nuclear volumes of

_{26}^{56} F e

$^{56}_{26}Fe$ and

_{2}^{4} H e

$^{4}_{2}He$ are, respectively:
1.

13 : 1

$13:1$ and

14 : 1

$14:1$
2.

14 : 1

$14:1$ and

1 : 1

$1:1$
3.

1 : 1

$1:1$ and

14 : 1

$14:1$
4.

1 : 1

$1:1$ and

13 : 1

$13:1$

Subtopic: Nucleus |

81%

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NEET - 2024

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Q3:

An excited heavy nucleus

_{Z}^{A} X

$^A_Z \mathrm{X}$ emits radiations in the following sequence:

_{Z}^{A} X \to_{Z - 2}^{A - 4} D_{1} \to_{Z - 1}^{A - 4} D_{2} \to_{Z - 3}^{A - 8} D_{3} \to_{Z - 4}^{A - 8} D_{4} \to_{Z - 4}^{A - 8} D_{5}

$^A_Z \mathrm{X}\rightarrow ^{A-4}_{Z-2}\mathrm{D_1}\rightarrow ^{A-4}_{Z-1}\mathrm{D_2}\rightarrow ^{A-8}_{Z-3}\mathrm{D_3}\rightarrow ^{A-8}_{Z-4}\mathrm{D_4}\rightarrow ^{A-8}_{Z-4}\mathrm{D_5}$
where

Z, A

$Z,A$ are the atomic and mass number of element

X,

$\mathrm{X},$ respectively. The possible emitted particles or radiations in the sequence, respectively are:
1.

e^{+}, α, e^{-}, α, γ

$e^+, \alpha, e^-, \alpha , \gamma$
2.

e^{-}, α, e^{+}, α, γ

$e^-, \alpha, e^+, \alpha , \gamma$
3.

α, e^{-}, α, e^{+}, γ

$\alpha ,e^-, \alpha, e^+, \gamma$
4.

α, e^{+}, α, e^{-}, γ

$\alpha ,e^+, \alpha, e^-, \gamma$

Subtopic: Types of Decay |

70%

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Q4:

Water is used as a coolant in a nuclear reactor because of its:
1. high thermal expansion coefficient
2. high specific heat capacity
3. low density
4. low boiling point

Subtopic: Nuclear Binding Energy |

71%

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Q5:

Select the correct statements among the following:

A.	slow neutrons can cause fission in $\mathrm U_{92}^{235}$ than fast neutrons.
B.	$\text{α-rays}$ are helium nuclei.
C.	$\text{β-rays}$ are fast-moving electrons or positrons.
D.	$\gamma\text-\text{rays}$ are electromagnetic radiations of wavelengths larger than $X\text-$ rays.

Choose the most appropriate answer from the options given below:

1.	A, B, and C only	2.	A, B, and D only
3.	A and B only	4.	C and D only

Subtopic: Nuclear Binding Energy |

70%

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NEET - 2024

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Q6:

In the given nuclear reaction, the element

X

$\mathrm{X}$ is:

_{11}^{22} N a \to X + e^{+} + ν

${ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu$

1.	${ }_{12}^{22} \mathrm{Mg}$	2.	${ }_{11}^{23} \mathrm{Na}$
3.	${ }_{10}^{23} \mathrm{Ne}$	4.	$_{10}^{22}\textrm{Ne}$

Subtopic: Types of Decay |

68%

From NCERT

NEET - 2022

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Q7:

A nucleus of mass number

189

$189$ splits into two nuclei having mass numbers

125

$125$ and

64.

$64.$ The ratio of the radius of two daughter nuclei respectively is:
1.

25 : 16

$25:16$
2.

1 : 1

$1:1$
3.

4 : 5

$4:5$
4.

5 : 4

$5:4$

Subtopic: Nucleus |

83%

From NCERT

NEET - 2022

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Q8:

A nucleus with mass number $240$ breaks into fragments each of mass number $120.$ The binding energy per nucleon of unfragmented nuclei is $7.6~\text{MeV}$ while that of fragments is $8.5~\text{MeV}.$ The total gain in the binding energy in the process is:
1. $804~\text{MeV}$
2. $216~\text{MeV}$
3. $0.9~\text{MeV}$
4. $9.4~\text{MeV}$

Subtopic: Nuclear Binding Energy |

64%

From NCERT

NEET - 2021

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Q9:

A radioactive nucleus

_{Z}^{A} X

$_{\mathrm{Z}}^{\mathrm{A}}\mathrm{X}$ undergoes spontaneous decay in the sequence

_{Z}^{A} X \to B_{Z - 1} \to C_{Z - 3} \to D_{Z - 2}

$_{\mathrm{Z}}^{\mathrm{A}}\mathrm{X}\rightarrow \mathrm{B}_{\mathrm{Z-1}}\rightarrow \mathrm{C}_{\mathrm{Z-3}}\rightarrow \mathrm{D}_{\mathrm{Z-2}}$ where

Z

$\mathrm{Z}$ is the atomic number of element

X .

$\mathrm{X}.$ The possible decay particles in the sequence are:

1.	$\beta^{+}, ~\alpha, ~\beta^{-}$	2.	$\beta^{-}, ~\alpha, ~\beta^{+}$
3.	$\alpha, ~\beta^{-},~\beta^{+}$	4.	$\alpha, ~\beta^{+},~\beta^{-}$

Subtopic: Types of Decay |

73%

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Q10:

The energy equivalent of $0.5~\text g$ of a substance is:
1. $4.5\times10^{13}~\text J$
2. $1.5\times10^{13}~\text J$
3. $0.5\times10^{13}~\text J$
4. $4.5\times10^{16}~\text J$

Subtopic: Mass-Energy Equivalent |

64%

From NCERT

NEET - 2020

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