List of top Physics Questions on Nuclei asked in NEET (UG)

A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the Binding Energy in the process is

When a uranium isotope $^{235}_92 U$ is bombarded with a neutron, it generates $^{89}_{36} Kr$, three neutrons and :

The half life of a radioactive isotope $X$ is $50$ years. It decays to another element $Y$ which is stable. The two elements $X$ and $Y$ were found to be in the ratio of $1 : 15$ in a sample of a given rock. The age of the rock was estimated to be

In a radioactive material the activity at time t₁ is R₁ and at a later time t₂, it is R₂. If the decay constant of the material is \(\lambda\), then :

In the reaction \(^2_1H+^3_1H\) \(\rightarrow\) \(^4_2He+^1_0n,\) if the binding energies of \(^2_1H\), \(^3_1H\) and \(^4_2He\) are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is:

The nuclei of which one of the following pairs of nuclei are isotones?

Fission of nuclei is possible because the binding energy per nucleon in them:

In any fission process the ratio (mass of fission products/mass of parent nucleus) is :

The half-life of radium is about 1600 years. Of 100g of radium existing now, 25g will remain undecayed after

MP denotes the mass of a proton and Mn that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by (c is the velocity of light )

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of  \(_2^4 He\) is (Given: helium nucleus mass ≈ 4.0015 u) 

In which of the following systems will be radius of the first orbit (n=1) be minimum:

The half-life of a radioactive isotope is 3 h. If the initial mass of the isotope was 300 g, the mass which remained undecayed after 18 h would be

The relation between  \(λ\) and \(T_\frac 12\)is: 
\((T_\frac 12 = half\  life, \ λ→decay\  constant)\)

Nuclear–Fission is best explained by:

India has the world's largest deposits of thorium in the form of

The energy equivalent of one atomic mass unit is