CBSE TEST PAPER-02 CLASS - XII PHYSICS (Atoms and Nuclei) Class 12 Notes | EduRev

Class 12 : CBSE TEST PAPER-02 CLASS - XII PHYSICS (Atoms and Nuclei) Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-02 
CLASS - XII PHYSICS (Atoms and Nuclei) 
1. Complete the following nuclear reactions [1] 
(a)
9 1 6
1 3
4 ....................... Be H Li + ? + 
(b) 
4
10 13
5 2 7 ..................... B He N + ? +
2. What is value ? - of a nuclear reaction? [1] 
3. What fraction of tritium will remain after 25 years? Given half life of tritium
as 12.5 years [1] 
4. Calculate the kinetic energy and potential energy of an electron in the first
orbit of hydrogen atom. Given e = 1.6 × 10
-19
C and r = 0.53 × 10
-10
m. [2] 
5. A neutron is absorbed by a 3 Li nucleus with subsequent emission of alpha
particle. Write the corresponding nuclear reaction? [2] 
6. If the activity of a radioactive substance drops to
1
8
th of its initial value in 30 years, 
find its half life period? [2] 
7. Show that nuclear density is in dependent of mass number A of a nucleus? [2] 
8. The wavelength of the first member of Balmer series in the hydrogen
spectrum is 6563A
o
. Calculate the wavelength of the first member of lyman
series in the same spectrum. [3] 
9. A neutron is absorbed by a
6
3Li nucleus with subsequent emission of . particle a - Write the corresponding nuclear reaction.
Calculate the energy released in this reaction. [3] 
Given mass of 
6
3Li = 6.015126 a.m.u. 
Mass of 
4
2 He = 4.000 26044 a.m.u. 
Mass of neutron 
1
o n
? ?
? ?
? ?
= 1.0086654 a.m.u. 
Mass of tritium 
1
1
H
? ?
? ?
? ?
= 3.016049 a.m.u. 
10. Define decay constant of a radioactive sample. Which of the following
radiation a-rays, ß-rays and ?-rays.
(i) Are similar to X – rays?  (ii) Are easily absorbed by matter? [3] 
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