NEET PYQ Nuclear Physics - Chapter-wise Questions with Solutions

About Nuclear Physics PYQs

Nuclear Physics has 341 previous year questions in the Quantrex Academy NEET UG Physics bank. The 220 questions in this list come from NEET (164), JIPMER (44) and MHT CET Medical (12), spanning 2002 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

NEET Nuclear Physics PYQs with Solutions

About Nuclear Physics PYQs

Questions by year (this list)

Nuclear Physics questions with solutions

Consider the following nuclear fission reaction _0^1 n + _ 92 ^ 235 U arrow _Z^A Y + _ 41 ^ 99 Nb + neutrons . If 4 neutrons are released during the fission process, then A and Z

Two spherical nuclei have mass numbers 216 and 64 with their radii R_1 and R_2 respectively. The ratio (R_1)/(R_2) is

At time t = 0 , the activity of a radioactive substance is 1600 Bq. At t= 8 s, the activity remains 100 Bq. The activity at t = 2 s, the is

A radioactive nucleus _ 92 X^ 235 decays to _ 91 Y^ 231 . Which of the following particles are emitted?

In a given reaction, ^ A _ Z X arrow ^ A _ Z+1 Y arrow ^ A-4 _ Z-1 K arrow ^ A-4 _ Z-1 K the radioactive radiations are emitted in the sequence of

When a nucleus in an atom undergoes a radioactive decay, the atomic number and/or mass number of the atom

A common example of β^- decay is _ 15 ^ 32 _ 16 ^ 32 + x + y Then x and y , respectively, stand for

For a radioactive nucleus that undergoes β^+ decay, which of the following CANNOT occur?

Two radioactive materials A and B having decay constant ' 7λ ' and ' λ ' respectively, initially have same number of nuclei. The time taken to have the ratio of number of nuclei

The equation ; 4\ ^ 1 _ 1 H arrow ^ 4 _ 2 He^ 2+ + 2\ e^- + 26\ MeV represents

The activity of a freshly prepared radioactive sample of a radioisotope is 10^ 10 disintegrations per second. The average life ( τ ) of this isotope is 10^9\ s , and the mass of a

A radio isotope X with a half life 1.4 × 10^8 year, decays to Y, which is stable. A sample of rock from a cave was found to contain X and Y in the ratio 1 : 7 . The age of rock

Four statements are given (A is mass number) : A. The volume of a nucleus is proportional to A^ 1/3 . B. The volume of a nucleus is proportional to A . C. The difference in mass

Consider the following nuclear reaction : ^ 238 Uarrow ^ 234 Th+ ^4He Take masses of ^ 238 U , ^ 234 Th and ^4He as 238.050 u, 234.043 u and 4.003 u, respectively. The Q value for

An unknown nucleus has a nuclear density of 2.29 × 10^ 17 kg/m ^3 and mass of 19.926 × 10^ -27 kg. Its mass number A is approximately : (Take R_0 = 1.2 × 10^ -15 m; 4π = 12.56 )

Select the correct statements among the following : A. Slow neutrons can cause fission in _ 92 ^ 235 U than fast neutrons. B. α -rays are Helium nuclei. C. β -rays are fast moving

Water is used as a coolant in a nuclear reactor because of its

In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to ((1)/(16))th of its initial value?

In the given nuclear reaction, the element X is Na 1122 → X + e ^ + + v

Given below are two statements: Statement I: The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the

A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64 . The ratio of radius of two daughter nuclei respectively is:

At any instant, two elements X_1 and X_2 have same number of radioactive atoms. If the decay constant of X_1 and X_2 are 10 λ and λ respectively. Then the time when the ratio of

The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :

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 . 6MeV while that of fragments is 8 .

A radioactive nucleus array ll A Z array X undergoes spontaneous decay in the sequence array ll A Z array X → array ll (Z - 1) array B → array ll (Z - 3) array C → array ll (Z

When a uranium isotope U 92235 is bombarded with a neutron, it generates Kr 3689 , three neutrons and:

The half life of radioactive sample undergoing α -decay is 1 . 4 × 10 ^ 17 s . If the number of nuclei in the sample is 2 . 0 × 10 ^ 21 , the activity of the sample is nearly:

The energy equivalent of 0.5g of a substance is:

What happens to the mass number and atomic number of an element when it emits γ -radiation

Ba-122 has half life of 2 min. Experiment has to be done using Ba-122 and it takes 10 min to set up the experiment. If initially 80 g of Ba-122 was taken, how much Ba was left

In which radiation atomic number and mass number are not affected?

Ratio of charge on positron to mass of positron is approximately

α -particle consists of&

The rate of radioactive disintegration at an instant for a radioactive sample of half life 2.2 × 10^9 ~s is 10^ 10 ~s^ -1 . The number of radioactive atoms in that sample at that

If half life of an element is 69.3 hours then how much of its percent will decay between 10^ th and 11^ th hour. Initial activity =50 μ C_i .

An atomic power nuclear reactor can deliver 300 MW. The energy released due to fission of each nucleus of uranium atoms U^ 238 is 170 MeV . The number of uranium atoms fissioned

Which of the following is fusion process?

In the fusion reaction _1^2 H+ _1^2 H _2^3 He+ _0^1 n , the masses of deuteron, helium and neutron expressed in amu are 2.015,3.017 and 1.009 , respectively. If 1 kg of deuterium

For a radioactive material, the half-life is 10minutes . If initially there are 600 number of nuclei, the time taken (in minutes ) for the disintegration of 450 nuclei is

The half-life period of a radioactive element X is same as the mean life of another radioactive element Y . Initially, both of them have the same numbers of atoms then,

Radioactive decay will occur as follows aligned & _ 86 ^ 220 Rn _ 84 ^ 216 PO+ _2^4 He Half life =55 s & _ 84 ^ 816 Po _ 82 ^ 212 Pb+ _2^4 He Half life =0 · 66 s & _ 82 ^ 212

When the radioactive isotope _ 88 R a^ 226 decays in a series by emission of three alpha (α) and a beta ( β ) particle, the isotope X which remains undecay is

A nucleus _Z^A X has mass represented by m(A, Z) . If m_p and m_n denote the mass of proton and neutron respectively and B E the binding energy (in MeV ) then,

Radioactive material A has decay constant 8λ and material B has decay constant λ . Initially they have the same number of nuclei. After what time, the ratio of number of nuclei of

A^7 Li target is bombarded with a proton beam current of 10^ -4 ~A for one hour to produce ^7 Be of activity 1.8 × 10^8 disintegrations per second. Assuming that one ^7 Be

A block having 12 g of element is placed in a room. This element is a radioactive element with half-life of 15 yr . After how many years will there be just 1.5 g of the element in

If a proton and anti-proton come close to each other and annihilate, how much energy will be released?

When an α -particle of mass &#160;m moving with a undefined velocity bombards on a heavy nucleus of charge Ze , its distance of the closest approach from the nucleus depends on m

The half-life of a radioactive substance is 30min . The time (in minutes) taken between 40 % decay and 85 % decay of the same radioactive substance is

The half-life of ^ 198 Au is 2.7 days. The average life is

A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2: 1 . The ratio of their nuclear size will be

If M_ O is the mass of an oxygen isotope _8 O^ 17 , M_p and M_n are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is

If radius of the A 1327 l nucleus is taken to be R _ Al then the radius of Te 53125 nucleus is nearly

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:

Remaining quantity (in\%) of radioactive element after 5 half lives is

A radio isotope &lsquo; X &rsquo; with a half life 1.4 × 10 ^ 9 years decays to &lsquo; Y &rsquo; which is stable. A sample of the rock from a cave was found to contain &lsquo; X

The Binding energy per nucleon of Li 37 and He 24 nucleon are 5.60MeV and 7.06MeV , respectively. In the nuclear reaction _ 3 ^ 7 Li + _ 1 ^ 1 H → _ 2 ^ 4 He + _ 2 ^ 4 He + Q

A radioactive element _ 90 X^ 238 decays into _ 83 Y^ 222 . The number of β -particles emitted are

The binding energy per nucleon is maximum in the case

The half-life of radio isotope is 4 h . If initial mass of the isotope was 200 g , then mass remaining after 24 h will be

How does the Binding Energy per nucleon vary with the increase in the number of nucleons?

α -particle, β -particle and γ -rays are all having same energy. Their penetrating power in a given medium in incresing order will be:

The half-life of a radioactive isotope X is 20 yr . It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio 1: 7 in a sample of a

A certain mass of hydrogen is changed to helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u . The energy liberated per u is (given 1 u=931 MeV )

If the nuclear radius of ^ 27 Al is 3.6 Fermi , the approximate nuclear radius of ^ 64 Cu in Fermi is

The half life of a radioactive nucleus is 50 days. The time interval (t_2-t_1) between the time t_2 when (2)/(3) of it has decayed and the time t_1 when (1)/(3) of it had decayed

A mixture consists of two radioactive materials A_1 and A_2 with half lives of 20 ~s and 10 ~s respectively. Initially the mixture has 40 ~g of A_1 and 160 ~g of A_2 . The amount

Activity of a radioactive sample decreases to (1/3)rd of its original value in 3 days. Then, in 9 days its activity will become

If r_1 and r_2 are the radii of the atomic nuclei of mass numbers 64 and 125 respectively, then the ratio (r_1 / r_2) is

The ionization energy of Li^ 2+ is equal to

X-rays are used in determining the molecular structure of crystalline because

The power obtained in a reactor using U^ 235 disintegration is 1000 ~kW . The mass decay of U^ 235 per hour is

A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils. The recoil energy will be

The half-life of a radioactive isotope X is 50 yr . 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 nucleus _n^m X emits one α -particle and two β^ - particles. The resulting nucleus is

When an α -particle of mass m moving with a undefined velocity bombards on a heavy nucleus of charge Ze , its distance of the closest approach from the nucleus depends on m

A radio isotope ‘ X ’ with a half life 1.4 × 10 ^ 9 years decays to ‘ Y ’ which is stable. A sample of the rock from a cave was found to contain ‘ X