31 Year NEET Previous Year Questions: Nuclei - 1 - NEET MCQ
30 Questions MCQ Test Physics Class 12 - 31 Year NEET Previous Year Questions: Nuclei - 1
In the reaction , 
if the binding energies of 
are respectively, a, b and c (in MeV), then the energy (in MeV) released in this reaction is [2005]
if the binding energies of are respectively, a, b and c (in MeV), then the energy (in MeV) released in this reaction is [2005]
requires a and b amount of energies for their nucleons to be separated.
releases c amount of energy in its formation i.e., in assembling the nucleons as nucleus.In any fission process, the ratio 
[2005]
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Fission of nuclei is possible because thebinding energy per nucleon in them [2005]
The binding energy of deuteron is 2.2 MeV and that of 
is 28 MeV. If two deuterons are fused to form one then the energy released is [2006]
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 λ, then [2006]
Two radioactive substances A and B have decay constants 5λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be (1/e)2 after a time interval [2007]
In a radioactive decay process, the negativelycharged emitted β -particles are [2007]
A nucleus AZX has mass represented by M (A, Z). If Mp and Mn denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then [2007]
If the nucleus 
has nuclear radius of about 3.6 fm, then 
would have its radius approximately as [2007]
let nuclear radius be R1
nuclear radius be R2
Two radioactive materials X1 and X2 have decay constants 5λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of X2 will be 1/e after a time
If M (A; Z), Mp and Mn denote the masses of the nucleus 
proton and neutron respectively in units of u ( 1u = 931.5 MeV/c2) and BE represents its bonding energy in MeV, then [2008]
ZMp + (A–Z) Mn–M(A,Z)
Two nuclei have their mass numbers in the ratioof 1 : 3. The ratio of their nuclear densities wouldbe [2008]
In the nuclear decay given below: [2009]
the particles emitted in the sequence are
mass number and charge number of a nucleus remains unchanged during γ decay)The mass of a 
nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of nucleus is nearly
The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is [2010]
The binding energy per nucleon in deuteriumand helium nuclei are 1.1 MeV and 7.0 MeV,respectively. When two deuterium nuclei fuseto form a helium nucleus the energy released inthe fusion is :
The decay constant of a radio isotope is λ. If A1 and A2 are its activities at times t1 and t2 respectively, the number of nuclei which have decayed during the time (t1 – t2) :
The half life of a radioactive isotope 'X' is 50 years. It decays to another element 'Y' which isstable. The two elements 'X' and 'Y' were foundto be in the ratio of 1 : 15 in a sample of agiven rock. The age of the rock was estimatedto be [2011]
The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is [2011]
(Power in watt)
= 4 × 10–8 kgA radioactive nucleus of mass M emits a photonof frequency μ and the nucleus recoils. The recoilenergy will be [2011]
A nucleus 
emits one α-particle and two β-particles. The resulting nucleus is [2011]
Fusion reaction takes place at high temperaturebecause [2011]
Two radioactive nuclei P and Q, in a given sample decay into a stable nucleolus R. At time t = 0, number of P species are 4 N0 and that of Q are N0. Half-life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be [2011M]
If the nuclear radius of 27Al is 3.6 Fermi, the approximate nuclear radius of 64Cu in Fermi is : [2012]
A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 srespectively. Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in themixture will become equal after : [2012]
The half life of a radioactive nucleus is 50 days. The time interval (t2 – t1) between the time t2 when 2/3 of its has decayed and the time t1 when 1/3 of it had decayed is : [2012]
...(i)
...(ii)
= 50 daysA certain mass of Hydrogen is changed to Heliumby the process of fusion. The mass defect infusion reaction is 0.02866 a.m.u. The energyliberated per a.m.u. is(Given : 1 a.m.u = 931 MeV) [NEET 2013]
The half life of a radioactive isotope ‘X’ is20 years. It decays to another element ‘Y’ whichis stable. The two elements ‘X’ and ‘Y’ were foundto be in the ratio of 1 : 7 in a sample of a thegiven rock. The age of the rock is estimated tobe [NEET 2013]
t = 3T = 3 × 20 = 60
α-particles, β-particles and γ-rays are all havingsame energy. Their penetrating power in a givenmedium in increasing order will be [NEET Kar. 2013]
How does the binding energy per nucleon varywith the increase in the number of nucleons ? [NEET Kar. 2013]
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