CBSE Test Paper (Atoms and Nuclei) (Class - XII Physics) Class 12 Notes | EduRev

Class 12 : CBSE Test Paper (Atoms and Nuclei) (Class - XII Physics) Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-03 
CLASS - XII PHYSICS (Atoms and Nuclei) 
1. The wavelengths of some of the spectral lines obtained in hydrogen spectrum are
9546A
o
, 6463A
o
 and 1216A
o
. Which one of these wavelengths belongs to Lyman series?
[1] 
2. Write the empirical relation for paschen series lines of hydrogen atom? [1] 
3. Why is nuclear fusion not possible in laboratory? [1] 
4. Express 16mg mass into equivalent energy in electron volt? [2] 
5. 
A radioactive nucleus undergoes a series of decay according to the scheme
1 2 3 4
A A A A A
a ß a ? - -- ? -- ? -- ? -- ?
If the mass number and atomic number of A are 180 and 72 respectively, what are there 
number for A4? 
[2] 
6. Distinguish between isotopes and isobars. Give are example for each of the species? [2] 
7. A radio active nuclide decays to form a stable nuclide its half life is 3 minutes. What
fractions of its 1g will remain radioactive after 9 minutes?
[2] 
8.
State radioactive decay law and hence derive the relation
t
o
N N e
? - =  where symbols
their usual meanings.
[3] 
9. Define half life and decay constant of a radioactive element. Write their S.I. unit. Define
expression for half life?
[3] 
10. Draw a curve between mass number and binding energy per nucleon. Give two salient
features of the curve. Hence define binding energy?
[3] 
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