Nuclei: NEET Physics Previous Year Questions

237 previous year questions from Nuclei. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $A radioactive nucleus can decay by two different processes. The half lives of the first and second decay processes are 5 \times 10^{3} and 10^{5} years respectiv\dots$
2. $α -decay of a parent nucleus X results in a daughter nucleus Y. If m_{x}, m_{y} and m_{a} are the masses of the parent nucleus, the daughter\dots$
3. $Half life of a radioactive element is 12.5 hour and its quantity is 256 g . After how much time its quantity will remain 1 g ?$
4. $The activity of a radioactive sample is measured as N_{0} counts per minute at t = 0 and N_{0} / e counts per minute at t = 5 minutes. The time (in minutes) at\dots$
5. $A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments\dots$
6. $A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2 : 1 . What will be the ratio of their nuclear size (nuclear radius)?$
7. $Fusion reaction takes place at high temperature because$
8. $The graph of ln (\frac{R}{R _{o}}) versus ln A is where R is radius of a nucleus, A is its mass number, and R_{0} \dots$
9. $Activity of a radioactive sample decreases to (1/3)^{rd} of its original value in 3 days. Then, in 9 days its activity will become$
10. $A nucleus with mass number 220 initially at rest emits an alpha particle. If the Q value of reaction is 5.5 MeV, calculate the value of kinetic energy of alph\dots$
11. $Two radioactive materials A and B have decay constants 10 λ and λ, respectively. If initially they have the same number of nuclei, then the ratio\dots$
12. $The relation between half life (T) and decay constant (λ) is$
13. $β decay means emission of electron from$
14. $A nucleus of mass 20 u emits a γ photon of energy 6 MeV . If the emission assume to occur when nucleus is free and at rest, then the nucleus will have\dots$
15. $The radius R of a nucleus of mass number A can be estimated by the formula R = (1.3 \times 10^{- 15}) A^{1/3} m It follows that the mass density of a\dots$
16. $The half life of a stream of radioactive particles moving along a straight path with a constant kinetic energy of 4 eV is 1 minute. The percentage of particles w\dots$
17. $The mass number and the volume of a nucleus is M and V, respectively. If the mass number is increased to 2 M, then the volume is changed to$
18. $Nuclear fission and fusion can be explained on the basis of$
19. $The rate of radioactive disintegration at an instant for a radioactive sample of half life 2.2 \times 1 0^{9} s is 1 0^{10} s^{- 1} . The number of radioactive atoms\dots$
20. $The binding energy of deuteron is 2.2 MeV and that of_{2}^{4} He is 28 MeV .If two deuterons are fused to form one_{2}^{4} He then t\dots$
21. $In a radioactive decay, an element_{z} X^{A} emits four α -particles, three β -particles and eight gamma photons. The atomic number and mass\dots$
22. $Half life of radioactive element is 1600 years. The fraction of sample remains undecayed after 6400 years will be$
23. $Two radioactive substances X and Y originally have N_{1} and N_{2} nuclei respectively. Half life of X is half ofthe half life of Y . After there half\dots$
24. $The half-life of^{198} Au is 3 days. If atomic weight of^{198} Au is 198 g / mol then the activity of 2 mg of\dots$
25. $A nucleus A, with a finite de-broglie wavelength λ_{A}, undergoes spontaneous fission into two nuclei B and C of equal mass. B flies in the same dire\dots$

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Nuclei: NEET Physics Previous Year Questions

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