PYQSidePowered byPrepblink ExamsMy practice

Nuclei

JEE Main 2025 (Online) 23rd January Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 23 January (Evening Shift)

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

  1. (A) is true but (R) is false
  2. Both (A) and (R) are true and (R) is the correct explanation of (A)
  3. (A) is false but (R) is true
  4. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

Answer

(1) (A) is true but (R) is false

Solution

From the curve, for 30<A<170 the binding energy per nucleon is almost constant ( 8 MeV): (A) is true.

[figure]

This is because the nuclear force is short range (about 1 to 3 fm): each nucleon feels only its neighbours. So (R) is false.

Answer: (1)

Keep practising — Nuclei

Ques. 2JEE Main 2026, 8 April (Evening Shift)

Two radioactive substances A and B of mass numbers 200 and 212 respectively, shows spontaneous -decay with same Q value of 1 MeV. The ratio of energies of -rays produced by A and B is .

  1. 25482650
  2. 27062646
  3. 25972600
  4. 28622499
Ques. 3JEE Main 2026, 6 April (Morning Shift)

The energy released when 717.13 kg of 37Li is converted into 24He by proton bombardment is 1032 eV. The value of is . (Nearest integer) (Mass of 37Li=7.0183 u, mass of 24He=4.004 u, mass of proton =1.008 u and 1 u =931 MeV/c2 and Avogadro number =6.0 1023)

Ques. 4JEE Main 2026, 6 April (Evening Shift)

The energy released if hydrogen atoms are combined to form 24He is MeV. (Take binding energies per nucleon of 12H and 24He as 1.1 MeV and 7.2 MeV, respectively)

  1. 6.1
  2. 24.4
  3. 26.6
  4. 5
Ques. 5JEE Main 2026, 5 April (Evening Shift)

Assuming the experimental mass of 612C as 12 u, the mass defect of 612C atom is MeV/c2. (Mass of proton = 1.00727 u, mass of neutron = 1.00866 u, 1 u = 931.5 MeV/c2 and c is the speed of the light in vacuum).

  1. 127.5
  2. 89.03
  3. 272.0
  4. 92.0
Ques. 6JEE Main 2026, 4 April (Morning Shift)

Two nuclei of mass number 3 combine with another nucleus of mass number 4 to yield a nucleus of mass number 10. If the binding energy per nucleon for the mass numbers 3, 4 and 10 are 5.6 MeV, 7.4 MeV and 6.1 MeV, respectively, then in the process, Mc2= MeV.

  1. 6.9
  2. 7.9
  3. 2.2
  4. 4.3
Ques. 7JEE Main 2026, 2 April (Evening Shift)

The binding energy per nucleon of 20983Bi is MeV. [Take m( 20983Bi) = 208.980388 u, mp = 1.007825 u, mn = 1.008665 u, 1 u = 931 MeV/c2]

  1. 7.48
  2. 7.84
  3. 8.79
  4. 6.94
Ques. 8JEE Main 2026, 28 January (Morning Shift)

An atom 83X is bombarded by shower of fundamental particles and in 10 s this atom absorbed 10 electrons, 10 protons and 9 neutrons. The percentage growth in the surface area of the nucleus is recorded by :

  1. 150\%
  2. 900\%
  3. 125\%
  4. 225\%
Ques. 9JEE Main 2026, 28 January (Evening Shift)

A nucleus has mass number and radius R . Another nucleus has mass number and radius R . If = 8 then R /R is :

  1. 1
  2. 2
  3. 8
  4. 0.5
Ques. 10JEE Main 2026, 24 January (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is true but Statement II is false
Ques. 11JEE Main 2026, 24 January (Evening Shift)

The binding energies for the following nuclear reactions are expressed in MeV. 2He3 + 0n1 2He4 + 20 MeV 2He4 + 0n1 2He5 - 0.9 MeV If X3, X4, X5 denote the stability of 2He3, 2He4 and 2He5, respectively, then the correct order is :

  1. X4 > X5 > X3
  2. X4 < X5 < X3
  3. X4 > X5 < X3
  4. X4 = X5 = X3

All Nuclei PYQs →

PDFDownload Nuclei PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)