NEET Physics / AI question bank / NCERT Class 12 / Atoms 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.
Also called: nuclear physics · radioactivity · binding energy · half-life
Questions
10 questions / answers after you pick
- Q1Two 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
- Q2Isotones 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
- Q3The 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
- Q4In 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
- Q5A nucleus holds many protons together despite their mutual repulsion. Which of these statements about the force responsible are correct?
Nuclear forceMediumStatement based
- Q6A 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
- Q7Each 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
- Q8Two 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
- Q9Match each nuclear quantity in List I with its approximate value in List II.
Mass–energy and nuclear binding energyEasyMatch the following
- Q10Taking 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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