Download Test Paper No. 13 (Physics)

TEST NO. 13
MAXIMUM MARKS : 25
1. How many electrons, protons and neutrons are there in a nucleus
(1)
of atomic number 11 and mass number 24?
2. Write the relation connecting the radius R, of nucleus and its mass no. A
(1)
3. Define binding energy of a nucleus?
(1)
4. The binding energies of deuteron (1H2) and  – particle (2He4) are 1.25
(1)
and 7.2 MeV / nucleon. Which nucleus is more stable and why?
5. Two nuclei have mass numbers in the ratio 27 : 125. What is the ratio of
(2)
their nuclear radii?
6. Define mass defect of a nucleus. How is it related to the binding energy
(2)
of the nucleus?
7. Define the term radioactivity. Can it be controlled?
(2)
8. Arrange radioactive radiations (-rays, -rays and -rays) in the increasing
(2)
order of the penetrating power.
9. A nucleus undergoes -decay. How does its
i)
mass number
ii)
(2)
atomic number change?
10. Derive the relation between decay constant  and half life period T
(2)
of a radioactive element.
11. A radioactive nucleus undergoes a series of decays according to sequence :
A
A1
A2

(3)
A3
If the mass number and atomic number of A are 180 and 72 respectively,
what are the mass number and atomic number of A3 ?
12. Draw a graph showing the variation of binding energy per nucleon with
(3)
mass number of different nuclei. Mark the region where the nuclei are
i)
Most stable ii)
prone to fusion
13. State decay law and derive decay equation.
iii)
prone to fission
(3)