Class 12 CBSE Physics Nuclei Boards Questions
Here we provide Class 12 physics important notes,board questions and predicted questions with Answers for chapter Nuclei. These important notes,board questions and predicted questions are based on CBSE board curriculum and correspond to the most recent Class 12 physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations.
2018
Q1
Four nuclei of an element undergo fusion to form a heavier nucleus, with release of energy. Which of
the two the parent or the daughter nucleus would have higher binding energy per nucleon ?
solutions
solutions
Q2
(a) Explain the processes of nuclear fission and nuclear fusion by using the plot of binding energy
per nucleon (BE/A) versus the mass number A.
(b) A radioactive isotope has a half-life of 10 years. How long will it take for the activity to reduce to 3.125% ?
solutions
(b) A radioactive isotope has a half-life of 10 years. How long will it take for the activity to reduce to 3.125% ?
solutions
2019
Q3
Define the term ‘decay constant’ of a radioactive sample. The rate of disintegration of a given
radioactive nucleus is 10,000 disintegration/s and 5000 disintegration/s after 20 hours and 30 hours
respectively from start. Calculate the half life and initial number of the nuclei at t = 0
solutions
solutions
2020
Q4
The nuclear radius of 2713Al is 3·6 fermi. Find the nuclear radius of
6429Cu.
solutions
solutions
Q5
Define the term ‘Half-life’ of a radioactive substance. Two different radioactive substances have
half-lives T1 and T2 and number of undecayed atoms at an instant, N1 and N2 , respectively. Find the
ratio of their activities at that instant.
solutions
solutions
Q6
The nucleus 235 92 Y, initially at rest, decays into
90231X by emitting an α-particle
The binding energies per nucleon of the parent nucleus, the daughter nucleus and α-particle are 7·8 MeV, 7·835 MeV and 7·07 MeV, respectively. Assuming the daughter nucleus to be formed in the unexcited state and neglecting its share in the energy of the reaction, find the speed of the emitted -particle. (Mass of α-particle = 6·68 x 10-27 kg)
solutions
The binding energies per nucleon of the parent nucleus, the daughter nucleus and α-particle are 7·8 MeV, 7·835 MeV and 7·07 MeV, respectively. Assuming the daughter nucleus to be formed in the unexcited state and neglecting its share in the energy of the reaction, find the speed of the emitted -particle. (Mass of α-particle = 6·68 x 10-27 kg)
solutions
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