Nuclei

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Nuclei” of Physics.

  • Q1.A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme :
    A α A 1 β A 2 α A 3 γ A 4
    If the mass number and atomic number of A are 180 and 72 respectively then the mass number and  atomic number for  A 4  are:

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  • Q2.The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an

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  • Q3.In a sample off radioactive substance, what percentage decays in one mean life time?

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  • Q4. The binding energy per nucleon for the parent nucleus is  E 1  and that for the daughter nuclei is  E 2 . Then

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  • Q5.Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. Find the ration of remaining number of A and B nuclei after 80 minutes.

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  • Q6. N 1  atoms of a radioactive element emit  N 2  beta particles per second. The decay consant of the  element ( in  s 1 ) is

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  • Q7. If,mass of   20 C a 40 = 39.962589 u Mass of proton = 1.007825 u,Mass of neutron=1.008665 u  and 1 u=931 MeV/ c 2 , then find the binding energy per nucleon of   20 C a 40  nucleus.

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