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JEE • PHYSICS • NUCLEI

Nuclei practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy

1 of 23

Understanding +4 | -1

Assertion: For an element generally

N \geq Z(N=

number of neutrons,

Z=

atomic number)
Reason: Neutrons always experience attractive nuclear force.

View answer and explanation

Correct option: B

If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

Option B (If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion) is correct because both the assertion about neutron-proton ratio and the reason about attractive nuclear force are true, but the latter doesn't explain the former.

2 Easy

2 of 23

Understanding +4 | -1

Which of the following are suitable for the fusion process?

View answer and explanation

Correct option: A

Light nuclei.

Option A (Light nuclei) is correct because nuclear fusion involves combining light nuclei to form heavier ones, releasing energy.

3 Easy

3 of 23

Understanding +4 | -1

F_{p p}, F_{n n}

and

F_{n p}

are the nuclear forces between proton -proton, neuron-neuron and neuron- proton respectively. Then relation between them is

View answer and explanation

Correct option: C

F_{p p}=F_{n n}=F_{n p}

Option C is correct because nuclear forces are charge-independent, meaning the force between any two nucleons (protons or neutrons) is the same.

4 Easy

4 of 23

Remembering +4 | -1

Which is used as a neutron absorber in nuclear
reactor:

View answer and explanation

Correct option: C

Cadmium

Option C (Cadmium) is correct because cadmium is commonly used as a neutron absorber in nuclear reactors to control the chain reaction.

5 Easy

5 of 23

Understanding +4 | -1

The momentum of an electron revolving in

n^{\text {th }}

orbit is given by: (Symbols have their usual meanings)

View answer and explanation

Correct option: A

\frac{n h}{2 \pi r}

Option A (

\frac{n h}{2 \pi r}

) is correct because the angular momentum is quantized, and linear momentum is derived from it.

6 Easy

6 of 23

Application +4 | -1

{r_1}\,\,\,{\text{and}}\,\,\,{r_2}

are the radii of atomic nuclei of mass number 125 and 216 respectively. The ratio of

\frac{{{r_1}}}{{{r_2}}}

View answer and explanation

Correct option: B

\frac{5}{6}

The correct answer is B (

\frac{5}{6}

) because the radius of a nucleus is proportional to the cube root of its mass number, and the ratio of the radii is the cube root of the ratio of the mass numbers.

7 Easy

7 of 23

Analyzing +4 | -1

Assertion:

{ }_1^3 {H}

isotope does not undergo fusion of the type

{ }_1^3 {H}+{ }_1^2 {H} \rightarrow

as it is rarely found in nature.
Reason:

{ }_1^3 {H}

has half life of

> >12

years.

View answer and explanation

Correct option: B

If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

Option B is correct because both the assertion and the reason are true, but the reason does not explain why the fusion doesn't occur; the rarity is the primary reason.

8 Easy

8 of 23

Application +4 | -1

If a proton is completely converted into energy, the amount of energy produced will be

View answer and explanation

Correct option: D

931 \times 10^6 \mathrm{~eV}

Option D (

931 \times 10^6 \mathrm{~eV}

) is correct because it is the energy equivalent of a proton's mass calculated using

E=mc^2

9 Easy

9 of 23

Understanding +4 | -1

From the statements given below:
(A) The angular momentum of an electron in

n^{\text {th}}

orbit is an integral multiple of

h

.
(B) Nuclear forces do not obey inverse square law.
(C) Nuclear forces are spin dependent.
(D) Nuclear forces are central and charge independent.
(E) Stability of nucleus is inversely proportional to the value of packing fraction.
Choose the correct answer from the options given below:

View answer and explanation

Correct option: D

(A), (B), (C), (E) only

The correct answer is D ((A), (B), (C), (E) only) because statements A, B, C, and E are correct, while statement D is incorrect as nuclear forces are non-central.

10 Easy

10 of 23

Application +4 | -1

What are the respective number of

\alpha

and

\beta^-

particles emitted in the following radioactive decay?

_{90}^{200}X \to \,_{82}^{172}Y

View answer and explanation

Correct option: A

7 and 6

Option A (7 and 6) is correct because balancing the mass number and atomic number in the radioactive decay equation yields 7 alpha particles and 6 beta-minus particles.

11 Easy

11 of 23

Understanding +4 | -1

Statement-1: In negative

\beta

-decay electron is emitted from nucleus, but electron cannot reside inside the nucleus.
Statement-2: Electron experience strong nuclear force.

View answer and explanation

Correct option: C

Statement-1 is true, Statement-2 is false

Option C (Statement-1 is true, Statement-2 is false) is correct because while electrons are emitted from the nucleus during negative beta decay, electrons do not reside inside the nucleus, and they do not experience the strong nuclear force.

12 Easy

12 of 23

Application +4 | -1

The velocity of alpha particles from polonium (atomic weight 210) is

1.6 \times 10^7 \mathrm{~m} / \mathrm{sec}

. What is the velocity of recoil atoms?

View answer and explanation

Correct option: B

3.1 \times 10^5 \mathrm{~m} / \mathrm{sec}

Option B (

3.1 \times 10^5 \mathrm{~m} / \mathrm{sec}

) is correct because it is calculated using the conservation of momentum principle.

13 Easy

13 of 23

Understanding +4 | -1

An element of mass

\mathrm{M}

has

\mathrm{Z}

protons and

\mathrm{N}

neutrons. Masses of proton and neutron are

m_p

and

m_n

respectively. Choose the correct relation among following options

View answer and explanation

Correct option: C

M < Z m_p+N m_n

Option C (

M < Z m_p+N m_n

) is correct because the mass of the nucleus is less than the sum of the masses of its constituent protons and neutrons due to the binding energy.

14 Easy

14 of 23

Remembering +4 | -1

Heavy water is the best _____ in nuclear reactor.

View answer and explanation

Correct option: A

Moderator

Option A (Moderator) is correct because heavy water slows down neutrons in a nuclear reactor, acting as a moderator.

15 Easy

15 of 23

Remembering +4 | -1

The penetrating power of

\alpha

-rays is

View answer and explanation

Correct option: B

Maximum

Option A (Minimum) is incorrect. Alpha particles have a high ionizing power but a minimum penetrating power due to their large mass and charge.

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16 Easy

16 of 23

Understanding +4 | -1

Statement-I: Positive values of packing fraction implies a large value of binding energy.

Statement-II : The difference between the mass of the nucleus and the mass number of the nucleus is called packing fraction.

View answer and explanation

Correct option: C

Statement-I is true and Statement-II is false

Option D (Statement-I is false and Statement-II is true) is correct because a positive packing fraction implies a smaller binding energy, and the packing fraction is related to the mass defect, not the mass number.

17 Easy

17 of 23

Understanding +4 | -1

Choose the best option for binding energy/nucleon if nuclear energy is released in fission. Binding energy is

View answer and explanation

Correct option: C

larger for fission fragments than for parent nucleus

Option C (larger for fission fragments than for parent nucleus) is correct because nuclear energy is released in fission due to the higher binding energy per nucleon in the fragments.

18 Easy

18 of 23

Understanding +4 | -1

Which of the following is more effective for producing nuclear reactions with nuclei compared to protons?

View answer and explanation

Correct option: A

neutrons

Option A is correct because neutrons, being neutral, are not repelled by the nucleus and can easily initiate nuclear reactions.

19 Easy

19 of 23

Understanding +4 | -1

Assertion: In

{U}_{\mathrm{235}}

fission reaction neutrons are required to be slowed down.
Reason: The probability of capture of slow moving neutrons is high for

{U}_{\mathrm{235}}

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion

Option A is correct because slow neutrons are more likely to be captured by U-235, making the fission reaction more efficient.

20 Easy

20 of 23

Application +4 | -1

If radius of the

{ }_{13}^{27} A l

nucleus is taken to be

R_{A l},

then the radius of

{ }_{52}^{125} {Te}

nucleus is:

View answer and explanation

Correct option: C

\frac{5}{3} R_{A l}

Option C (

\frac{5}{3} R_{Al}

) is correct because it correctly applies the formula for nuclear radius in terms of mass number.

21 Easy

21 of 23

Understanding +4 | -1

Statement-I: The BE per nucleon of the fused heavier nuclei is more than the B.E per nucleon of the lighter nuclei.

Statement-II: The final system is more tightly bound to the initial system.

View answer and explanation

Correct option: A

Statement-I and Statement-II are true

Option A (Statement-I and Statement-II are true) is correct because the binding energy per nucleon is higher for heavier nuclei formed in fusion, indicating a more tightly bound system.

22 Easy

22 of 23

Analyzing +4 | -1

The graph of

\ln \left(\frac{R}{R_0}\right)

versus

\ln A

(R=

radius of a nucleus and

A=

its mass number) is:

View answer and explanation

Correct option: A

a straight line

Option A (a straight line) is correct because the relationship between the radius of a nucleus and its mass number is such that the logarithm of their ratio is linearly proportional to the logarithm of the mass number.

23 Easy

23 of 23

Understanding +4 | -1

Statement-1: The mass per nucleon in a hydrogen atom is the same as the in an oxygen atom.
Statement-2: The energy released during the formation of nuclei of different atoms from their constituent nuclei is different.

View answer and explanation

Correct option: D

Statement-1 is false, Statement-2 is true

Option D is correct because the mass per nucleon is different for hydrogen and oxygen due to different binding energies, and the energy released during nuclei formation varies.

Revision notes and key takeaways

Review NUCLEI in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 23 single-correct-answer MCQs on NUCLEI.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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