Page 1 - WS-2

Class XII

PHYSICS

Chapter-13-NUCLEI

WORKSHEET-2

1. The mass number of iron nucleus is 56 the nuclear density is
-3
16
(a) 2.29 × 10 kg m
-3
17
(b) 2.29 × 10 kg m
-3
18
(c) 2.29 × 10 kg m
(d) 2.29 × 10 kg m
15
-3
2. Order of magnitude of density of uranium nucleus is
20
-3
(a) 10 kg m
17
-3
(b) 10 kg m
14
-3
(c) 10 kg m
(d) 10 kg m
-3
11
3. The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass
number of the nucleus most likely to be?
(a) 27
(b) 40
(c) 56
(d) 120
4. Binding energy per nucleon of a stable nucleus is
(a) 8 eV
(b) 8 KeV
(c) 8 MeV
(d) 8 BeV
5. Average binding energy is maximum for
12
(a) C
56
(b) Fe
235
(c) U
(d) Po
210
6. What is the relation between the binding energy per nucleon and stability of a nucleus?
7. n the nuclear reaction

What does X stand for?
(a) Electron
(b) Proton
(c) Neutron
(d) Neutrino

8. The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass
number of the nucleus most likely to be?
(a) 27
(b) 40
(c) 56
(d) 120
9. 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
(a) isomer of parent
(b) isotone of parent