NEET PhysicsNCERT Class 12Atoms and Nuclei

Nuclei: NEET questions with solutions

NEET tests nuclear composition and isotope/isobar/isotone labels, R = R₀A^(1/3) and the constancy of nuclear density, mass defect and binding energy per nucleon, the shape of the binding-energy curve, properties of the nuclear force, and Q-values and energy yields of fission and fusion. Marks are lost by using bare-proton mass with atomic masses, by forgetting the cube root in the radius law, and by mixing up whether a reaction releases or absorbs energy.

Revise first: NCERT notes for Nuclei

Questions

10 questions · answers after you pick

1Two nuclei have mass numbers 216 and 27. What is the ratio of the radius of the heavier nucleus to that of the lighter one?Size of the nucleusEasySingle correct 2Isotones are nuclides with the same number of neutrons but different numbers of protons. Which pair below are isotones?Atomic masses and composition of nucleusEasySingle correct 3The atomic mass of ⁷₃Li is 7.016003 u. Using m(¹H) = 1.007825 u, mₙ = 1.008665 u and 1 u = 931.5 MeV/c², find the binding energy per nucleon…Mass–energy and nuclear binding energyMediumSingle correct 4In one fusion branch, two deuterons combine as ²H + ²H → ³He + n. Using m(²H) = 2.014102 u, m(³He) = 3.016029 u, mₙ = 1.008665 u and 1 u =…Nuclear energy: fission and fusionMediumSingle correct 5A nucleus holds many protons together despite their mutual repulsion. Which of these statements about the force responsible are correct?Nuclear forceMediumStatement based 6A uranium-235 nucleus captures a slow neutron and splits into two medium-mass fragments with a large release of energy. Read the Assertion…Mass–energy and nuclear binding energyMediumAssertion–Reason 7Each fission of a ²³⁵U nucleus releases about 200 MeV. If every nucleus in 1.0 g of pure ²³⁵U undergoes fission, about how much energy is…Nuclear energy: fission and fusionHardSingle correct 8Two deuterons (²₁H) fuse to form a helium nucleus (⁴₂He). Take the binding energy per nucleon as 1.1 MeV for the deuteron and 7.0 MeV for…Nuclear energy: fission and fusionHardSingle correct 9Match each nuclear quantity in List I with its approximate value in List II.Mass–energy and nuclear binding energyEasyMatch the following 10Taking the mass of a nucleon as 1.66 × 10⁻²⁷ kg and R = R₀A^(1/3) with R₀ = 1.2 fm, what is the approximate density of nuclear matter?Size of the nucleusMediumSingle correct

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